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## javax.faces.component
Class UIComponentBase

    java.lang.Object
      javax.faces.component.UIComponent
          javax.faces.component.UIComponentBase

All Implemented Interfaces:
  java.util.EventListener, PartialStateHolder, StateHolder, TransientStateHolder, ComponentSystemEventListener, FacesListener, SystemEventListenerHolder

Direct Known Subclasses:
  UIColumn, UICommand, UIData, UIForm, UIGraphic, UIMessage, UIMessages, UINamingContainer, UIOutput, UIPanel, UIParameter, UISelectItem, UISelectItems, UIViewRoot

    public abstract class UIComponentBase

extends UIComponent

UIComponentBase is a convenience base class that implements the default concrete behavior of all methods defined by `UIComponent`.

By default, this class defines `getRendersChildren()` to find the renderer for this component and call its `getRendersChildren()` method. The default implementation on the `Renderer` returns `false`. As of version 1.2 of the JavaServer Faces Specification, component authors are encouraged to return `true` from this method and rely on the implementation of `encodeChildren(javax.faces.context.FacesContext)` in this class and in the Renderer (`Renderer.encodeChildren(javax.faces.context.FacesContext, javax.faces.component.UIComponent)`). Subclasses that wish to manage the rendering of their children should override this method to return `true` instead.

Field Summary

Fields inherited from class javax.faces.component.UIComponent
`ATTRS_WITH_DECLARED_DEFAULT_VALUES, BEANINFO_KEY, bindings, COMPOSITE_COMPONENT_TYPE_KEY, COMPOSITE_FACET_NAME, CURRENT_COMPONENT, CURRENT_COMPOSITE_COMPONENT, FACETS_KEY, HONOR_CURRENT_COMPONENT_ATTRIBUTES_PARAM_NAME, VIEW_LOCATION_KEY`

Constructor Summary
`UIComponentBase()`

Method Summary
`void` | `addClientBehavior(java.lang.String eventName, ClientBehavior behavior)` This is a default implementation of `ClientBehaviorHolder.addClientBehavior(java.lang.String, javax.faces.component.behavior.ClientBehavior)`.
`protected void` | `addFacesListener(FacesListener listener)` Add the specified `FacesListener` to the set of listeners registered to receive event notifications from this `UIComponent`.
`void` | `broadcast(FacesEvent event)` Broadcast the specified `FacesEvent` to all registered event listeners who have expressed an interest in events of this type.
`void` | `clearInitialState()` For each of the attached objects on this instance that implement `PartialStateHolder`, call `PartialStateHolder.clearInitialState()` on the attached object.
`void` | `decode(FacesContext context)` Decode any new state of this `UIComponent` from the request contained in the specified `FacesContext`, and store this state as needed.
`void` | `encodeBegin(FacesContext context)` If our `rendered` property is `true`, render the beginning of the current state of this `UIComponent` to the response contained in the specified `FacesContext`.
`void` | `encodeChildren(FacesContext context)` If our `rendered` property is `true`, render the child `UIComponent`s of this `UIComponent`.
`void` | `encodeEnd(FacesContext context)` If our `rendered` property is `true`, render the ending of the current state of this `UIComponent`.
`UIComponent` | `findComponent(java.lang.String expr)` Search for and return the `UIComponent` with an `id` that matches the specified search expression (if any), according to the algorithm described below.
`java.util.Map<java.lang.String,java.lang.Object>` | `getAttributes()` Return a mutable `Map` representing the attributes (and properties, see below) associated wth this `UIComponent`, keyed by attribute name (which must be a String).
`int` | `getChildCount()` Return the number of child `UIComponent`s that are associated with this `UIComponent`.
`java.util.List<UIComponent>` | `getChildren()` Return a mutable `List` representing the child `UIComponent`s associated with this component.
`java.util.Map<java.lang.String,java.util.List<ClientBehavior>>` | `getClientBehaviors()` This is a default implementation of `ClientBehaviorHolder.getClientBehaviors()`.
`java.lang.String` | `getClientId(FacesContext context)` Return a client-side identifier for this component, generating one if necessary.
`java.lang.String` | `getDefaultEventName()` This is a default implementation of `ClientBehaviorHolder.getDefaultEventName()`.
`java.util.Collection<java.lang.String>` | `getEventNames()` This is a default implementation of `ClientBehaviorHolder.getEventNames()`.
`protected FacesContext` | `getFacesContext()` Convenience method to return the `FacesContext` instance for the current request.
`protected FacesListener[]` | `getFacesListeners(java.lang.Class clazz)` Return an array of registered `FacesListener`s that are instances of the specified class.
`UIComponent` | `getFacet(java.lang.String name)` Convenience method to return the named facet, if it exists, or `null` otherwise.
`int` | `getFacetCount()` Return the number of facet `UIComponent`s that are associated with this `UIComponent`.
`java.util.Map<java.lang.String,UIComponent>` | `getFacets()` Return a mutable `Map` representing the facet `UIComponent`s associated with this `UIComponent`, keyed by facet name (which must be a String).
`java.util.Iterator<UIComponent>` | `getFacetsAndChildren()` Return an `Iterator` over the facet followed by child `UIComponent`s of this `UIComponent`.
`java.lang.String` | `getId()` Return the component identifier of this `UIComponent`.
`java.util.List<SystemEventListener>` | `getListenersForEventClass(java.lang.Class<? extends SystemEvent> eventClass)` Return the `SystemEventListener` instances registered on this `UIComponent` instance that are interested in events of type `eventClass`.
`UIComponent` | `getParent()` Return the parent `UIComponent` of this `UIComponent`, if any.
`protected Renderer` | `getRenderer(FacesContext context)` Convenience method to return the `Renderer` instance associated with this component, if any; otherwise, return `null`.
`java.lang.String` | `getRendererType()` Return the `Renderer` type for this `UIComponent` (if any).
`boolean` | `getRendersChildren()` Return a flag indicating whether this component is responsible for rendering its child components.
`ValueBinding` | `getValueBinding(java.lang.String name)` Deprecated. This has been replaced by `UIComponent.getValueExpression(java.lang.String)`.
`boolean` | `invokeOnComponent(FacesContext context, java.lang.String clientId, ContextCallback callback)` Starting at this component in the View hierarchy, search for a component with a `clientId` equal to the argument `clientId` and, if found, call the `ContextCallback.invokeContextCallback(javax.faces.context.FacesContext, javax.faces.component.UIComponent)` method on the argument `callback`, passing the current `FacesContext` and the found component as arguments.
`boolean` | `isRendered()` Return `true` if this component (and its children) should be rendered during the Render Response phase of the request processing lifecycle.
`boolean` | `isTransient()` If true, the Object implementing this interface must not participate in state saving or restoring.
`void` | `markInitialState()` For each of the attached objects on this instance that implement `PartialStateHolder`, call `PartialStateHolder.markInitialState()` on the attached object.
`void` | `processDecodes(FacesContext context)` Perform the component tree processing required by the Apply Request Values phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
`void` | `processRestoreState(FacesContext context, java.lang.Object state)` Perform the component tree processing required by the Restore View phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
`java.lang.Object` | `processSaveState(FacesContext context)` Perform the component tree processing required by the state saving portion of the Render Response phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
`void` | `processUpdates(FacesContext context)` Perform the component tree processing required by the Update Model Values phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
`void` | `processValidators(FacesContext context)` Perform the component tree processing required by the Process Validations phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
`void` | `queueEvent(FacesEvent event)` Queue an event for broadcast at the end of the current request processing lifecycle phase.
`protected void` | `removeFacesListener(FacesListener listener)` Remove the specified `FacesListener` from the set of listeners registered to receive event notifications from this `UIComponent`.
`static java.lang.Object` | `restoreAttachedState(FacesContext context, java.lang.Object stateObj)` This method is called by `UIComponent` subclasses that need to restore the objects they saved using `saveAttachedState(javax.faces.context.FacesContext, java.lang.Object)`.
`void` | `restoreState(FacesContext context, java.lang.Object state)` Perform any processing required to restore the state from the entries in the state Object.
`static java.lang.Object` | `saveAttachedState(FacesContext context, java.lang.Object attachedObject)` This method is called by `UIComponent` subclasses that want to save one or more attached objects.
`java.lang.Object` | `saveState(FacesContext context)` Gets the state of the instance as a `Serializable` Object.
`void` | `setId(java.lang.String id)` Set the component identifier of this `UIComponent` (if any).
`void` | `setParent(UIComponent parent)` Set the parent `UIComponent` of this `UIComponent`.
`void` | `setRendered(boolean rendered)` Set the `rendered` property of this `UIComponent`.
`void` | `setRendererType(java.lang.String rendererType)` Set the `Renderer` type for this `UIComponent`, or `null` for components that render themselves.
`void` | `setTransient(boolean transientFlag)` Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.
`void` | `setValueBinding(java.lang.String name, ValueBinding binding)` Deprecated. This has been replaced by `UIComponent.setValueExpression(java.lang.String, javax.el.ValueExpression)`.
`void` | `subscribeToEvent(java.lang.Class<? extends SystemEvent> eventClass, ComponentSystemEventListener componentListener)` Install the listener instance referenced by argument `componentListener` as a listener for events of type `eventClass` originating from this specific instance of `UIComponent`.
`void` | `unsubscribeFromEvent(java.lang.Class<? extends SystemEvent> eventClass, ComponentSystemEventListener componentListener)` Remove the listener instance referenced by argument `componentListener` as a listener for events of type `eventClass` originating from this specific instance of `UIComponent`.

Methods inherited from class javax.faces.component.UIComponent
`encodeAll, getClientId, getCompositeComponentParent, getContainerClientId, getCurrentComponent, getCurrentCompositeComponent, getFamily, getNamingContainer, getResourceBundleMap, getStateHelper, getStateHelper, getTransientStateHelper, getTransientStateHelper, getValueExpression, initialStateMarked, isCompositeComponent, isInView, isVisitable, popComponentFromEL, processEvent, pushComponentToEL, restoreTransientState, saveTransientState, setInView, setValueExpression, visitTree`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### UIComponentBase

    public UIComponentBase()

Method Detail

### getAttributes

    public java.util.Map<java.lang.String,java.lang.Object> getAttributes()

  Description copied from class: `UIComponent`

  Return a mutable `Map` representing the attributes (and properties, see below) associated wth this `UIComponent`, keyed by attribute name (which must be a String). The returned implementation must support all of the standard and optional `Map` methods, plus support the following additional requirements:

  - The `Map` implementation must implement the `java.io.Serializable` interface.
  - Any attempt to add a `null` key or value must throw a `NullPointerException`.
  - Any attempt to add a key that is not a String must throw a `ClassCastException`.
  - If the attribute name specified as a key matches a property of this `UIComponent`'s implementation class, the following methods will have special behavior:
    - `containsKey` - Return `false`.
    - `get()` - If the property is readable, call the getter method and return the returned value (wrapping primitive values in their corresponding wrapper classes); otherwise throw `IllegalArgumentException`.
    - `put()` - If the property is writeable, call the setter method to set the corresponding value (unwrapping primitive values in their corresponding wrapper classes). If the property is not writeable, or an attempt is made to set a property of primitive type to `null`, throw `IllegalArgumentException`.
    - `remove` - Throw `IllegalArgumentException`.

  Specified by:
    `getAttributes` in class `UIComponent`

### getValueBinding

    public ValueBinding getValueBinding(java.lang.String name)

  Deprecated. This has been replaced by `UIComponent.getValueExpression(java.lang.String)`.

  Call through to `UIComponent.getValueExpression(java.lang.String)` and examine the result. If the result is an instance of the wrapper class mandated in `UIComponent.setValueBinding(java.lang.String, javax.faces.el.ValueBinding)`, extract the `ValueBinding` instance and return it. Otherwise, wrap the result in an implementation of `ValueBinding`, and return it.

  Specified by:
    `getValueBinding` in class `UIComponent`
  Parameters:
    `name` - Name of the attribute or property for which to retrieve a `ValueBinding`
  Throws:
    `java.lang.NullPointerException` - if `name` is `null`

### setValueBinding

    public void setValueBinding(java.lang.String name,
                                ValueBinding binding)

  Deprecated. This has been replaced by `UIComponent.setValueExpression(java.lang.String, javax.el.ValueExpression)`.

  Wrap the argument `binding` in an implementation of `ValueExpression` and call through to `UIComponent.setValueExpression(java.lang.String, javax.el.ValueExpression)`.

  Specified by:
    `setValueBinding` in class `UIComponent`
  Parameters:
    `name` - Name of the attribute or property for which to set a `ValueBinding`
    `binding` - The `ValueBinding` to set, or `null` to remove any currently set `ValueBinding`
  Throws:
    `java.lang.IllegalArgumentException` - if `name` is one of `id` or `parent`
    `java.lang.NullPointerException` - if `name` is `null`

### getClientId

    public java.lang.String getClientId(FacesContext context)

  Description copied from class: `UIComponent`

  Return a client-side identifier for this component, generating one if necessary. The associated `Renderer`, if any, will be asked to convert the clientId to a form suitable for transmission to the client.

  The return from this method must be the same value throughout the lifetime of the instance, unless the `id` property of the component is changed, or the component is placed in a `NamingContainer` whose client ID changes (for example, `UIData`). However, even in these cases, consecutive calls to this method must always return the same value. The implementation must follow these steps in determining the clientId:

  Find the closest ancestor to this component in the view hierarchy that implements `NamingContainer`. Call `getContainerClientId()` on it and save the result as the `parentId` local variable. Call `UIComponent.getId()` on this component and save the result as the `myId` local variable. If `myId` is `null`, call `context.getViewRoot().createUniqueId()` and assign the result to myId. If `parentId` is non-`null`, let `myId` equal `parentId + `UINamingContainer.getSeparatorChar(javax.faces.context.FacesContext)` + myId`. Call `Renderer.convertClientId(javax.faces.context.FacesContext, java.lang.String)`, passing `myId`, and return the result.

  Specified by:
    `getClientId` in class `UIComponent`
  Parameters:
    `context` - The `FacesContext` for the current request
  Throws:
    `java.lang.NullPointerException` - if `context` is `null`

### getId

    public java.lang.String getId()

  Description copied from class: `UIComponent`

  Return the component identifier of this `UIComponent`.

  Specified by:
    `getId` in class `UIComponent`

### setId

    public void setId(java.lang.String id)

  Description copied from class: `UIComponent`

  Set the component identifier of this `UIComponent` (if any). Component identifiers must obey the following syntax restrictions:

  - Must not be a zero-length String.
  - First character must be a letter or an underscore ('_').
  - Subsequent characters must be a letter, a digit, an underscore ('_'), or a dash ('-').

  Component identifiers must also obey the following semantic restrictions (note that this restriction is NOT enforced by the `setId()` implementation):

  - The specified identifier must be unique among all the components (including facets) that are descendents of the nearest ancestor `UIComponent` that is a `NamingContainer`, or within the scope of the entire component tree if there is no such ancestor that is a `NamingContainer`.

  Specified by:
    `setId` in class `UIComponent`
  Parameters:
    `id` - The new component identifier, or `null` to indicate that this `UIComponent` does not have a component identifier
  Throws:
    `java.lang.IllegalArgumentException` - if `id` is not syntactically valid
    `java.lang.IllegalStateException`

### getParent

    public UIComponent getParent()

  Description copied from class: `UIComponent`

  Return the parent `UIComponent` of this `UIComponent`, if any. A component must allow child components to be added to and removed from the list of children of this component, even though the child component returns null from `getParent( )`.

  Specified by:
    `getParent` in class `UIComponent`

### setParent

    public void setParent(UIComponent parent)

  Description copied from class: `UIComponent`

  Set the parent `UIComponent` of this `UIComponent`. If `parent.isInView()` returns `true`, calling this method will first cause a `PreRemoveFromViewEvent` to be published, for this node, and then the children of this node. Then, once the re-parenting has occurred, a `PostAddToViewEvent` will be published as well, first for this node, and then for the node's children, but only if any of the following conditions are true.

  - `FacesContext.getCurrentPhaseId()` returns `PhaseId.RESTORE_VIEW` and partial state saving is enabled.

  - `FacesContext.isPostback()` returns `false` and `FacesContext.getCurrentPhaseId()` returns something other than `PhaseId.RESTORE_VIEW`

  This method must never be called by developers; a `UIComponent`'s internal implementation will call it as components are added to or removed from a parent's child `List` or facet `Map`.

  Specified by:
    `setParent` in class `UIComponent`
  Parameters:
    `parent` - The new parent, or `null` for the root node of a component tree

### isRendered

    public boolean isRendered()

  Description copied from class: `UIComponent`

  Return `true` if this component (and its children) should be rendered during the Render Response phase of the request processing lifecycle.

  Specified by:
    `isRendered` in class `UIComponent`

### setRendered

    public void setRendered(boolean rendered)

  Description copied from class: `UIComponent`

  Set the `rendered` property of this `UIComponent`.

  Specified by:
    `setRendered` in class `UIComponent`
  Parameters:
    `rendered` - If `true` render this component; otherwise, do not render this component

### getRendererType

    public java.lang.String getRendererType()

  Description copied from class: `UIComponent`

  Return the `Renderer` type for this `UIComponent` (if any).

  Specified by:
    `getRendererType` in class `UIComponent`

### setRendererType

    public void setRendererType(java.lang.String rendererType)

  Description copied from class: `UIComponent`

  Set the `Renderer` type for this `UIComponent`, or `null` for components that render themselves.

  Specified by:
    `setRendererType` in class `UIComponent`
  Parameters:
    `rendererType` - Logical identifier of the type of `Renderer` to use, or `null` for components that render themselves

### getRendersChildren

    public boolean getRendersChildren()

  Description copied from class: `UIComponent`

  Return a flag indicating whether this component is responsible for rendering its child components. The default implementation in `getRendersChildren()` tries to find the renderer for this component. If it does, it calls `Renderer.getRendersChildren()` and returns the result. If it doesn't, it returns false. As of version 1.2 of the JavaServer Faces Specification, component authors are encouraged to return `true` from this method and rely on `encodeChildren(javax.faces.context.FacesContext)`.

  Specified by:
    `getRendersChildren` in class `UIComponent`

### getChildren

    public java.util.List<UIComponent> getChildren()

  Description copied from class: `UIComponent`

  Return a mutable `List` representing the child `UIComponent`s associated with this component. The returned implementation must support all of the standard and optional `List` methods, plus support the following additional requirements:

  - The `List` implementation must implement the `java.io.Serializable` interface.
  - Any attempt to add a `null` must throw a NullPointerException
  - Any attempt to add an object that does not implement `UIComponent` must throw a ClassCastException.
  - Whenever a new child component is added, the `parent` property of the child must be set to this component instance. If the `parent` property of the child was already non-null, the child must first be removed from its previous parent (where it may have been either a child or a facet).
  - Whenever an existing child component is removed, the `parent` property of the child must be set to `null`.

  - After the child component has been added to the view, `Application.publishEvent(javax.faces.context.FacesContext, java.lang.Class, java.lang.Object)` must be called, passing `PostAddToViewEvent``.class` as the first argument and the newly added component as the second argument if any the following cases are true.

    - `FacesContext.getCurrentPhaseId()` returns `PhaseId.RESTORE_VIEW` and partial state saving is enabled.

    - `FacesContext.isPostback()` returns `false` and `FacesContext.getCurrentPhaseId()` returns something other than `PhaseId.RESTORE_VIEW`

  Specified by:
    `getChildren` in class `UIComponent`

### getChildCount

    public int getChildCount()

  Description copied from class: `UIComponent`

  Return the number of child `UIComponent`s that are associated with this `UIComponent`. If there are no children, this method must return 0. The method must not cause the creation of a child component list.

  Specified by:
    `getChildCount` in class `UIComponent`

### findComponent

    public UIComponent findComponent(java.lang.String expr)

  Description copied from class: `UIComponent`

  Search for and return the `UIComponent` with an `id` that matches the specified search expression (if any), according to the algorithm described below.

  For a method to find a component given a simple `clientId`, see `UIComponent.invokeOnComponent(javax.faces.context.FacesContext, java.lang.String, javax.faces.component.ContextCallback)`.

  Component identifiers are required to be unique within the scope of the closest ancestor `NamingContainer` that encloses this component (which might be this component itself). If there are no `NamingContainer` components in the ancestry of this component, the root component in the tree is treated as if it were a `NamingContainer`, whether or not its class actually implements the `NamingContainer` interface.

  A search expression consists of either an identifier (which is matched exactly against the `id` property of a `UIComponent`, or a series of such identifiers linked by the `UINamingContainer.getSeparatorChar(javax.faces.context.FacesContext)` character value. The search algorithm should operates as follows, though alternate alogrithms may be used as long as the end result is the same:

  - Identify the `UIComponent` that will be the base for searching, by stopping as soon as one of the following conditions is met:
    - If the search expression begins with the the separator character (called an "absolute" search expression), the base will be the root `UIComponent` of the component tree. The leading separator character will be stripped off, and the remainder of the search expression will be treated as a "relative" search expression as described below.
    - Otherwise, if this `UIComponent` is a `NamingContainer` it will serve as the basis.
    - Otherwise, search up the parents of this component. If a `NamingContainer` is encountered, it will be the base.
    - Otherwise (if no `NamingContainer` is encountered) the root `UIComponent` will be the base.
  - The search expression (possibly modified in the previous step) is now a "relative" search expression that will be used to locate the component (if any) that has an `id` that matches, within the scope of the base component. The match is performed as follows:
    - If the search expression is a simple identifier, this value is compared to the `id` property, and then recursively through the facets and children of the base `UIComponent` (except that if a descendant `NamingContainer` is found, its own facets and children are not searched).
    - If the search expression includes more than one identifier separated by the separator character, the first identifier is used to locate a `NamingContainer` by the rules in the previous bullet point. Then, the `findComponent()` method of this `NamingContainer` will be called, passing the remainder of the search expression.

  Specified by:
    `findComponent` in class `UIComponent`
  Parameters:
    `expr` - Search expression identifying the `UIComponent` to be returned
  Returns:
    the found `UIComponent`, or `null` if the component was not found.
  Throws:
    `java.lang.NullPointerException` - if `expr` is `null`

### invokeOnComponent

    public boolean invokeOnComponent(FacesContext context,
                                     java.lang.String clientId,
                                     ContextCallback callback)
                              throws FacesException

  Starting at this component in the View hierarchy, search for a component with a `clientId` equal to the argument `clientId` and, if found, call the `ContextCallback.invokeContextCallback(javax.faces.context.FacesContext, javax.faces.component.UIComponent)` method on the argument `callback`, passing the current `FacesContext` and the found component as arguments. This method is similar to `UIComponent.findComponent(java.lang.String)` but it does not support the leading `UINamingContainer.getSeparatorChar(javax.faces.context.FacesContext)` syntax for searching from the root of the View.

  The default implementation will first check if `this.getClientId()` is equal to the argument `clientId`. If so, first call `UIComponent.pushComponentToEL(javax.faces.context.FacesContext, javax.faces.component.UIComponent)`, then call the `ContextCallback.invokeContextCallback(javax.faces.context.FacesContext, javax.faces.component.UIComponent)` method on the argument callback, passing through the `FacesContext` argument and passing this as the component argument. Then call `UIComponent.popComponentFromEL(javax.faces.context.FacesContext)`. If an `Exception` is thrown by the callback, wrap it in a `FacesException` and re-throw it. Otherwise, return `true`.

  Otherwise, for each component returned by `UIComponent.getFacetsAndChildren()`, call `invokeOnComponent()` passing the arguments to this method, in order. The first time `invokeOnComponent()` returns true, abort traversing the rest of the `Iterator` and return `true`.

  When calling `ContextCallback.invokeContextCallback(javax.faces.context.FacesContext, javax.faces.component.UIComponent)` the implementation of this method must guarantee that the state of the component passed to the callback correctly reflects the component's position in the View hierarchy with respect to any state found in the argument `clientId`. For example, an iterating component such as `UIData` will need to set its row index to correctly reflect the argument `clientId` before finding the appropriate child component backed by the correct row. When the callback returns, either normally or by throwing an `Exception` the implementation of this method must restore the state of the view to the way it was before invoking the callback.

  If none of the elements from `UIComponent.getFacetsAndChildren()` returned `true` from `invokeOnComponent()`, return `false`.

  Simple usage example to find a component by `clientId`.

      private UIComponent found = null;

      private void doFind(FacesContext context, String clientId) {
        context.getViewRoot().invokeOnComponent(context, clientId,
            new ContextCallback() {
               public void invokeContextCallback(FacesContext context,
                                             UIComponent component) {
                 found = component;
               }
            });
      }

  Overrides:
    `invokeOnComponent` in class `UIComponent`
  Parameters:
    `context` - the `FacesContext` for the current request
    `clientId` - the client identifier of the component to be passed to the argument callback.
    `callback` - an implementation of the Callback interface.
  Returns:
    `true` if the a component with the given `clientId` is found, the callback method was successfully invoked passing that component as an argument, and no Exception was thrown. Returns `false` if no component with the given `clientId` is found.
  Throws:
    `java.lang.NullPointerException` - if any of the arguments are null
    `FacesException` - if the argument Callback throws an Exception, it is wrapped in a `FacesException` and re-thrown.
  Since:
    1.2

### getFacets

    public java.util.Map<java.lang.String,UIComponent> getFacets()

  Description copied from class: `UIComponent`

  Return a mutable `Map` representing the facet `UIComponent`s associated with this `UIComponent`, keyed by facet name (which must be a String). The returned implementation must support all of the standard and optional `Map` methods, plus support the following additional requirements:

  - The `Map` implementation must implement the `java.io.Serializable` interface.
  - Any attempt to add a `null` key or value must throw a NullPointerException.
  - Any attempt to add a key that is not a String must throw a ClassCastException.
  - Any attempt to add a value that is not a `UIComponent` must throw a ClassCastException.
  - Whenever a new facet `UIComponent` is added:
    - The `parent` property of the component must be set to this component instance.
    - If the `parent` property of the component was already non-null, the component must first be removed from its previous parent (where it may have been either a child or a facet).
  - Whenever an existing facet `UIComponent` is removed:
    - The `parent` property of the facet must be set to `null`.

  Specified by:
    `getFacets` in class `UIComponent`

### getFacetCount

    public int getFacetCount()

  Description copied from class: `UIComponent`

  Return the number of facet `UIComponent`s that are associated with this `UIComponent`. If there are no facets, this method must return 0. The method must not cause the creation of a facet component map.

  For backwards compatability with classes that extend UIComponent directly, a default implementation is provided that simply calls `UIComponent.getFacets()` and then calls the `size()` method on the returned `Map`. A more optimized version of this method is provided in `getFacetCount()`.

  Overrides:
    `getFacetCount` in class `UIComponent`

### getFacet

    public UIComponent getFacet(java.lang.String name)

  Description copied from class: `UIComponent`

  Convenience method to return the named facet, if it exists, or `null` otherwise. If the requested facet does not exist, the facets Map must not be created.

  Specified by:
    `getFacet` in class `UIComponent`
  Parameters:
    `name` - Name of the desired facet

### getFacetsAndChildren

    public java.util.Iterator<UIComponent> getFacetsAndChildren()

  Description copied from class: `UIComponent`

  Return an `Iterator` over the facet followed by child `UIComponent`s of this `UIComponent`. Facets are returned in an undefined order, followed by all the children in the order they are stored in the child list. If this component has no facets or children, an empty `Iterator` is returned.

  The returned `Iterator` must not support the `remove()` operation.

  Specified by:
    `getFacetsAndChildren` in class `UIComponent`

### broadcast

    public void broadcast(FacesEvent event)
                   throws AbortProcessingException

  Description copied from class: `UIComponent`

  Broadcast the specified `FacesEvent` to all registered event listeners who have expressed an interest in events of this type. Listeners are called in the order in which they were added.

  If the `event` is an instance of `BehaviorEvent` and the current `component` is the source of the `event` call `BehaviorEvent.getBehavior()` to get the `Behavior` for the event. Call `Behavior.broadcast(javax.faces.event.BehaviorEvent)` on the `Behavior` instance.

  Specified by:
    `broadcast` in class `UIComponent`
  Parameters:
    `event` - The `FacesEvent` to be broadcast
  Throws:
    `AbortProcessingException` - Signal the JavaServer Faces implementation that no further processing on the current event should be performed
    `java.lang.IllegalStateException`
    `java.lang.NullPointerException` - if `event` is `null`

### decode

    public void decode(FacesContext context)

  Description copied from class: `UIComponent`

  Decode any new state of this `UIComponent` from the request contained in the specified `FacesContext`, and store this state as needed.

  During decoding, events may be enqueued for later processing (by event listeners who have registered an interest), by calling `queueEvent()`.

  Specified by:
    `decode` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the request we are processing
  Throws:
    `java.lang.NullPointerException` - if `context` is `null`

### encodeBegin

    public void encodeBegin(FacesContext context)
                     throws java.io.IOException

  Description copied from class: `UIComponent`

  If our `rendered` property is `true`, render the beginning of the current state of this `UIComponent` to the response contained in the specified `FacesContext`. Call `UIComponent.pushComponentToEL(javax.faces.context.FacesContext,javax.faces.component.UIComponent)`. Call `Application.publishEvent(javax.faces.context.FacesContext, java.lang.Class, java.lang.Object)`, passing `PreRenderComponentEvent``.class` as the first argument and the component instance to be rendered as the second argument.

  If a `Renderer` is associated with this `UIComponent`, the actual encoding will be delegated to `Renderer.encodeBegin(FacesContext, UIComponent)`.

  If our `rendered` property is `false`, call `UIComponent.pushComponentToEL(javax.faces.context.FacesContext,javax.faces.component.UIComponent)` and return immediately.

  Specified by:
    `encodeBegin` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the response we are creating
  Throws:
    `java.lang.NullPointerException` - if `context` is `null`
    `java.io.IOException` - if an input/output error occurs while rendering

### encodeChildren

    public void encodeChildren(FacesContext context)
                        throws java.io.IOException

  Description copied from class: `UIComponent`

  If our `rendered` property is `true`, render the child `UIComponent`s of this `UIComponent`. This method will only be called if the `rendersChildren` property is `true`.

  If a `Renderer` is associated with this `UIComponent`, the actual encoding will be delegated to `Renderer.encodeChildren(FacesContext, UIComponent)`. If no `Renderer` is associated with this `UIComponent`, iterate over each of the children of this component and call `UIComponent.encodeAll(javax.faces.context.FacesContext)`.

  Specified by:
    `encodeChildren` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the response we are creating
  Throws:
    `java.lang.NullPointerException` - if `context` is `null`
    `java.io.IOException` - if an input/output error occurs while rendering

### encodeEnd

    public void encodeEnd(FacesContext context)
                   throws java.io.IOException

  Description copied from class: `UIComponent`

  If our `rendered` property is `true`, render the ending of the current state of this `UIComponent`.

  If a `Renderer` is associated with this `UIComponent`, the actual encoding will be delegated to `Renderer.encodeEnd(FacesContext, UIComponent)`.

  Call `UIComponent.popComponentFromEL(javax.faces.context.FacesContext)`. before returning regardless of the value of the `rendered` property.

  Specified by:
    `encodeEnd` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the response we are creating
  Throws:
    `java.io.IOException` - if an input/output error occurs while rendering
    `java.lang.NullPointerException` - if `context` is `null`

### addFacesListener

    protected void addFacesListener(FacesListener listener)

  Add the specified `FacesListener` to the set of listeners registered to receive event notifications from this `UIComponent`. It is expected that `UIComponent` classes acting as event sources will have corresponding typesafe APIs for registering listeners of the required type, and the implementation of those registration methods will delegate to this method. For example:

       public class FooEvent extends FacesEvent {
         ...
         protected boolean isAppropriateListener(FacesListener listener) {
           return (listener instanceof FooListener);
         }
         protected void processListener(FacesListener listener) {
           ((FooListener) listener).processFoo(this);
         }
         ...
       }

       public interface FooListener extends FacesListener {
         public void processFoo(FooEvent event);
       }

       public class FooComponent extends UIComponentBase {
         ...
         public void addFooListener(FooListener listener) {
           addFacesListener(listener);
         }
         public void removeFooListener(FooListener listener) {
           removeFacesListener(listener);
         }
         ...
       }

  Specified by:
    `addFacesListener` in class `UIComponent`
  Parameters:
    `listener` - The `FacesListener` to be registered
  Throws:
    `java.lang.NullPointerException` - if `listener` is `null`

### getFacesListeners

    protected FacesListener[] getFacesListeners(java.lang.Class clazz)

  Description copied from class: `UIComponent`

  Return an array of registered `FacesListener`s that are instances of the specified class. If there are no such registered listeners, a zero-length array is returned. The returned array can be safely be cast to an array strongly typed to an element type of `clazz`.

  Specified by:
    `getFacesListeners` in class `UIComponent`
  Parameters:
    `clazz` - Class that must be implemented by a `FacesListener` for it to be returned
  Throws:
    `java.lang.IllegalArgumentException` - if `class` is not, and does not implement, `FacesListener`
    `java.lang.NullPointerException` - if `clazz` is `null`

### removeFacesListener

    protected void removeFacesListener(FacesListener listener)

  Remove the specified `FacesListener` from the set of listeners registered to receive event notifications from this `UIComponent`.

  Specified by:
    `removeFacesListener` in class `UIComponent`
  Parameters:
    `listener` - The `FacesListener` to be deregistered
  Throws:
    `java.lang.NullPointerException` - if `listener` is `null`

### queueEvent

    public void queueEvent(FacesEvent event)

  Description copied from class: `UIComponent`

  Queue an event for broadcast at the end of the current request processing lifecycle phase. The default implementation in `UIComponentBase` must delegate this call to the `queueEvent()` method of the parent `UIComponent`.

  Specified by:
    `queueEvent` in class `UIComponent`
  Parameters:
    `event` - `FacesEvent` to be queued
  Throws:
    `java.lang.IllegalStateException` - if this component is not a descendant of a `UIViewRoot`
    `java.lang.NullPointerException` - if `event` is `null`

### subscribeToEvent

    public void subscribeToEvent(java.lang.Class<? extends SystemEvent> eventClass,
                                 ComponentSystemEventListener componentListener)

  Install the listener instance referenced by argument `componentListener` as a listener for events of type `eventClass` originating from this specific instance of `UIComponent`. The default implementation creates an inner `SystemEventListener` instance that wraps argument `componentListener` as the `listener` argument. This inner class must call through to the argument `componentListener` in its implementation of `SystemEventListener.processEvent(javax.faces.event.SystemEvent)` and its implementation of `SystemEventListener.isListenerForSource(java.lang.Object)` must return true if the instance class of this `UIComponent` is assignable from the argument to `isListenerForSource`.

  Overrides:
    `subscribeToEvent` in class `UIComponent`
  Parameters:
    `eventClass` - the `Class` of event for which `listener` must be fired.
    `componentListener` - the implementation of `ComponentSystemEventListener` whose `ComponentSystemEventListener.processEvent(javax.faces.event.ComponentSystemEvent)` method must be called when events of type `facesEventClass` are fired.
  Throws:
    ``NullPointerException`` - if any of the arguments are `null`.
  Since:
    2.1

### unsubscribeFromEvent

    public void unsubscribeFromEvent(java.lang.Class<? extends SystemEvent> eventClass,
                                     ComponentSystemEventListener componentListener)

  Remove the listener instance referenced by argument `componentListener` as a listener for events of type `eventClass` originating from this specific instance of `UIComponent`. When doing the comparison to determine if an existing listener is equal to the argument `componentListener` (and thus must be removed), the `equals()` method on the existing listener must be invoked, passing the argument `componentListener`, rather than the other way around.

  Overrides:
    `unsubscribeFromEvent` in class `UIComponent`
  Parameters:
    `eventClass` - the `Class` of event for which `listener` must be removed.
    `componentListener` - the implementation of `ComponentSystemEventListener` whose `ComponentSystemEventListener.processEvent(javax.faces.event.ComponentSystemEvent)` method must no longer be called when events of type `eventClass` are fired.
  Throws:
    ``NullPointerException`` - if any of the arguments are `null`.
  Since:
    2.1

### getListenersForEventClass

    public java.util.List<SystemEventListener> getListenersForEventClass(java.lang.Class<? extends SystemEvent> eventClass)

  Return the `SystemEventListener` instances registered on this `UIComponent` instance that are interested in events of type `eventClass`.

  Specified by:
    `getListenersForEventClass` in interface `SystemEventListenerHolder`
  Overrides:
    `getListenersForEventClass` in class `UIComponent`
  Parameters:
    `eventClass` - the `Class` of event for which the listeners must be returned.
  Throws:
    `java.lang.NullPointerException` - if argument `eventClass` is `null`.
  Since:
    2.1

### processDecodes

    public void processDecodes(FacesContext context)

  Description copied from class: `UIComponent`

  Perform the component tree processing required by the Apply Request Values phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.

  - If the `rendered` property of this `UIComponent` is `false`, skip further processing.
  - Call `UIComponent.pushComponentToEL(javax.faces.context.FacesContext, javax.faces.component.UIComponent)`.
  - Call the `processDecodes()` method of all facets and children of this `UIComponent`, in the order determined by a call to `getFacetsAndChildren()`.
  - Call the `decode()` method of this component.
  - Call `UIComponent.popComponentFromEL(javax.faces.context.FacesContext)` from inside of a `finally block, just before returning.`
  - If a `RuntimeException` is thrown during decode processing, call `FacesContext.renderResponse()` and re-throw the exception.

  Specified by:
    `processDecodes` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the request we are processing
  Throws:
    `java.lang.NullPointerException` - if `context` is `null`

### processValidators

    public void processValidators(FacesContext context)

  Description copied from class: `UIComponent`

  Perform the component tree processing required by the Process Validations phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.

  - If the `rendered` property of this `UIComponent` is `false`, skip further processing.
  - Call `UIComponent.pushComponentToEL(javax.faces.context.FacesContext, javax.faces.component.UIComponent)`.
  - Call the `processValidators()` method of all facets and children of this `UIComponent`, in the order determined by a call to `getFacetsAndChildren()`.
  - After returning from calling `getFacetsAndChildren()` call `UIComponent.popComponentFromEL(javax.faces.context.FacesContext)`.

  Specified by:
    `processValidators` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the request we are processing
  Throws:
    `java.lang.NullPointerException` - if `context` is `null`

### processUpdates

    public void processUpdates(FacesContext context)

  Description copied from class: `UIComponent`

  Perform the component tree processing required by the Update Model Values phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.

  - If the `rendered` property of this `UIComponent` is `false`, skip further processing.
  - Call `UIComponent.pushComponentToEL(javax.faces.context.FacesContext, javax.faces.component.UIComponent)`.
  - Call the `processUpdates()` method of all facets and children of this `UIComponent`, in the order determined by a call to `getFacetsAndChildren()`. After returning from the `processUpdates()` method on a child or facet, call `UIComponent.popComponentFromEL(javax.faces.context.FacesContext)`

  Specified by:
    `processUpdates` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the request we are processing
  Throws:
    `java.lang.NullPointerException` - if `context` is `null`

### processSaveState

    public java.lang.Object processSaveState(FacesContext context)

  Description copied from class: `UIComponent`

  Perform the component tree processing required by the state saving portion of the Render Response phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.

  - consult the `transient` property of this component. If true, just return `null`.
  - Call `UIComponent.pushComponentToEL(javax.faces.context.FacesContext, javax.faces.component.UIComponent)`.
  - Call the `processSaveState()` method of all facets and children of this `UIComponent` in the order determined by a call to `getFacetsAndChildren()`, skipping children and facets that are transient. Ensure that `UIComponent.popComponentFromEL(javax.faces.context.FacesContext)` is called correctly after each child or facet.
  - Call the `saveState()` method of this component.
  - Encapsulate the child state and your state into a Serializable Object and return it.

  This method may not be called if the state saving method is set to server.

  Specified by:
    `processSaveState` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the request we are processing
  Throws:
    `java.lang.NullPointerException` - if `context` is `null`

### processRestoreState

    public void processRestoreState(FacesContext context,
                                    java.lang.Object state)

  Description copied from class: `UIComponent`

  Perform the component tree processing required by the Restore View phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.

  - Call the `restoreState()` method of this component.
  - Call `UIComponent.pushComponentToEL(javax.faces.context.FacesContext, javax.faces.component.UIComponent)`.
  - Call the `processRestoreState()` method of all facets and children of this `UIComponent` in the order determined by a call to `getFacetsAndChildren()`. After returning from the `processRestoreState()` method on a child or facet, call `UIComponent.popComponentFromEL(javax.faces.context.FacesContext)`

  This method may not be called if the state saving method is set to server.

  Specified by:
    `processRestoreState` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the request we are processing
  Throws:
    `java.lang.NullPointerException` - if `context` is `null`

### getFacesContext

    protected FacesContext getFacesContext()

  Description copied from class: `UIComponent`

  Convenience method to return the `FacesContext` instance for the current request.

  Specified by:
    `getFacesContext` in class `UIComponent`

### getRenderer

    protected Renderer getRenderer(FacesContext context)

  Description copied from class: `UIComponent`

  Convenience method to return the `Renderer` instance associated with this component, if any; otherwise, return `null`.

  Specified by:
    `getRenderer` in class `UIComponent`
  Parameters:
    `context` - `FacesContext` for the current request

### markInitialState

    public void markInitialState()

  For each of the attached objects on this instance that implement `PartialStateHolder`, call `PartialStateHolder.markInitialState()` on the attached object.

  Specified by:
    `markInitialState` in interface `PartialStateHolder`
  Overrides:
    `markInitialState` in class `UIComponent`
  Since:
    2.0

### clearInitialState

    public void clearInitialState()

  For each of the attached objects on this instance that implement `PartialStateHolder`, call `PartialStateHolder.clearInitialState()` on the attached object.

  Specified by:
    `clearInitialState` in interface `PartialStateHolder`
  Overrides:
    `clearInitialState` in class `UIComponent`
  Since:
    2.0

### saveState

    public java.lang.Object saveState(FacesContext context)

  Description copied from interface: `StateHolder`

  Gets the state of the instance as a `Serializable` Object.

  If the class that implements this interface has references to instances that implement StateHolder (such as a `UIComponent` with event handlers, validators, etc.) this method must call the `StateHolder.saveState(javax.faces.context.FacesContext)` method on all those instances as well. This method must not save the state of children and facets. That is done via the `StateManager`

  This method must not alter the state of the implementing object. In other words, after executing this code:

  `

       Object state = component.saveState(facesContext);

  `

  `component` should be the same as before executing it.

  The return from this method must be `Serializable`

### restoreState

    public void restoreState(FacesContext context,
                             java.lang.Object state)

  Description copied from interface: `StateHolder`

  Perform any processing required to restore the state from the entries in the state Object.

  If the class that implements this interface has references to instances that also implement StateHolder (such as a `UIComponent` with event handlers, validators, etc.) this method must call the `StateHolder.restoreState(javax.faces.context.FacesContext, java.lang.Object)` method on all those instances as well.

  If the `state` argument is `null`, take no action and return.

### isTransient

    public boolean isTransient()

  Description copied from interface: `StateHolder`

  If true, the Object implementing this interface must not participate in state saving or restoring.

### setTransient

    public void setTransient(boolean transientFlag)

  Description copied from interface: `StateHolder`

  Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.

  Parameters:
    `transientFlag` - boolean pass `true` if this Object will not participate in state saving or restoring, otherwise pass `false`.

### saveAttachedState

    public static java.lang.Object saveAttachedState(FacesContext context,
                                                     java.lang.Object attachedObject)

  This method is called by `UIComponent` subclasses that want to save one or more attached objects. It is a convenience method that does the work of saving attached objects that may or may not implement the `StateHolder` interface. Using this method implies the use of `restoreAttachedState(javax.faces.context.FacesContext, java.lang.Object)` to restore the attached objects.

  This method supports saving attached objects of the following type: `Object`s, `null` values, and `Collection`s of these objects. If any contained objects are not `Collection`s and do not implement `StateHolder`, they must have zero-argument public constructors. The exact structure of the returned object is undefined and opaque, but will be serializable.

  Parameters:
    `context` - the `FacesContext` for this request.
    `attachedObject` - the object, which may be a `List` instance, or an Object. The `attachedObject` (or the elements that comprise `attachedObject` may implement `StateHolder`.
  Throws:
    `java.lang.NullPointerException` - if the context argument is null.

### restoreAttachedState

    public static java.lang.Object restoreAttachedState(FacesContext context,
                                                        java.lang.Object stateObj)
                                                 throws java.lang.IllegalStateException

  This method is called by `UIComponent` subclasses that need to restore the objects they saved using `saveAttachedState(javax.faces.context.FacesContext, java.lang.Object)`. This method is tightly coupled with `saveAttachedState(javax.faces.context.FacesContext, java.lang.Object)`.

  This method supports restoring all attached objects types supported by `saveAttachedState(javax.faces.context.FacesContext, java.lang.Object)`.

  Parameters:
    `context` - the `FacesContext` for this request
    `stateObj` - the opaque object returned from `saveAttachedState(javax.faces.context.FacesContext, java.lang.Object)`
  Throws:
    `java.lang.NullPointerException` - if context is null.
    `java.lang.IllegalStateException` - if the object is not previously returned by `saveAttachedState(javax.faces.context.FacesContext, java.lang.Object)`.

### addClientBehavior

    public void addClientBehavior(java.lang.String eventName,
                                  ClientBehavior behavior)

  This is a default implementation of `ClientBehaviorHolder.addClientBehavior(java.lang.String, javax.faces.component.behavior.ClientBehavior)`. `UIComponent` does not implement the `ClientBehaviorHolder` interface, but provides default implementations for the methods defined by `ClientBehaviorHolder` to simplify subclass implementations. Subclasses that wish to support the `ClientBehaviorHolder` contract must declare that the subclass implements `ClientBehaviorHolder`, and must provide an implementation of `ClientBehaviorHolder.getEventNames()`.

  Parameters:
    `eventName` - the logical name of the client-side event to attach the behavior to.
    `behavior` - the `Behavior` instance to attach for the specified event name.
  Since:
    2.0

### getEventNames

    public java.util.Collection<java.lang.String> getEventNames()

  This is a default implementation of `ClientBehaviorHolder.getEventNames()`. `UIComponent` does not implement the `ClientBehaviorHolder` interface, but provides default implementations for the methods defined by `ClientBehaviorHolder` to simplify subclass implementations. Subclasses that wish to support the `ClientBehaviorHolder` contract must declare that the subclass implements `ClientBehaviorHolder`, and must override this method to return a non-Empty `Collection` of the client event names that the component supports.

  Since:
    2.0

### getClientBehaviors

    public java.util.Map<java.lang.String,java.util.List<ClientBehavior>> getClientBehaviors()

  This is a default implementation of `ClientBehaviorHolder.getClientBehaviors()`. `UIComponent` does not implement the `ClientBehaviorHolder` interface, but provides default implementations for the methods defined by `ClientBehaviorHolder` to simplify subclass implementations. Subclasses that wish to support the `ClientBehaviorHolder` contract must declare that the subclass implements `ClientBehaviorHolder`, and must add an implementation of `ClientBehaviorHolder.getEventNames()`.

  Since:
    2.0

### getDefaultEventName

    public java.lang.String getDefaultEventName()

  This is a default implementation of `ClientBehaviorHolder.getDefaultEventName()`. `UIComponent` does not implement the `ClientBehaviorHolder` interface, but provides default implementations for the methods defined by `ClientBehaviorHolder` to simplify subclass implementations. Subclasses that wish to support the `ClientBehaviorHolder` contract must declare that the subclass implements `ClientBehaviorHolder`, and must provide an implementation of `ClientBehaviorHolder.getEventNames()`.

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