org.modeshape.jcr.query.plan

## Class PlanNode

- java.lang.Object
- - org.modeshape.jcr.query.plan.PlanNode

- All Implemented Interfaces:
    Serializable, Cloneable, Iterable<PlanNode>, Readable

      @NotThreadSafe
      public final class PlanNode
      extends Object
      implements Iterable<PlanNode>, Readable, Cloneable, Serializable

  A representation of a single node within a plan tree.
  See Also:
    Serialized Form

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static interface` | `PlanNode.Operation`
    `static class` | `PlanNode.Property` An enumeration dictating the type of plan tree nodes.
    `static class` | `PlanNode.Traversal`
    `static class` | `PlanNode.Type` An enumeration dictating the type of plan tree nodes.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PlanNode(PlanNode.Type type)` Create a new plan node with the supplied initial type.
    `PlanNode(PlanNode.Type type, Iterable<SelectorName> selectors)` Create a new plan node with the supplied initial type ad that is a child of the supplied parent.
    `PlanNode(PlanNode.Type type, PlanNode parent)` Create a new plan node with the supplied initial type ad that is a child of the supplied parent.
    `PlanNode(PlanNode.Type type, PlanNode parent, Iterable<SelectorName> selectors)` Create a new plan node with the supplied initial type ad that is a child of the supplied parent.
    `PlanNode(PlanNode.Type type, PlanNode parent, SelectorName... selectors)` Create a new plan node with the supplied initial type ad that is a child of the supplied parent.
    `PlanNode(PlanNode.Type type, SelectorName... selectors)` Create a new plan node with the supplied initial type ad that is a child of the supplied parent.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addChildren(Iterable<PlanNode> otherChildren)` Add the supplied nodes at the end of the list of children.
    `void` | `addChildren(PlanNode first, PlanNode second)` Add the supplied nodes at the end of the list of children.
    `void` | `addChildren(PlanNode first, PlanNode second, PlanNode third)` Add the supplied nodes at the end of the list of children.
    `void` | `addFirstChild(PlanNode child)` Add the supplied node to the front of the list of children.
    `void` | `addLastChild(PlanNode child)` Add the supplied node to the end of the list of children.
    `void` | `addSelector(SelectorName symbol)` Add a selector to this plan node.
    `void` | `addSelector(SelectorName first, SelectorName second)` Add the selectors to this plan node.
    `void` | `addSelectors(Iterable<SelectorName> names)` Add the selectors to this plan node.
    `void` | `apply(PlanNode.Traversal order, PlanNode.Operation operation)` Walk the plan tree starting in the specified traversal order, and apply the supplied operation to every plan node.
    `void` | `apply(PlanNode.Traversal order, PlanNode.Operation operation, PlanNode.Type type)` Walk the plan tree starting in the specified traversal order, and apply the supplied operation to every plan node with a type that matches the given type.
    `void` | `apply(PlanNode.Traversal order, PlanNode.Operation operation, PlanNode.Type firstType, PlanNode.Type... additionalTypes)` Walk the plan tree starting in the specified traversal order, and apply the supplied operation to every plan node that is one of the supplied types.
    `void` | `apply(PlanNode.Traversal order, PlanNode.Operation operation, Set<PlanNode.Type> types)` Walk the plan tree starting in the specified traversal order, and apply the supplied operation to every plan node that is one of the supplied types.
    `protected void` | `applyLevelOrder(PlanNode.Traversal order, PlanNode.Operation operation)`
    `void` | `applyToAncestorsUpTo(PlanNode.Type stopType, PlanNode.Operation operation)` Apply the operation to all ancestor nodes below a node of the given type.
    `PlanNode` | `clone()` This class returns a new clone of the plan tree rooted at this node.
    `protected PlanNode` | `cloneWithoutNewParent()`
    `boolean` | `equals(Object obj)`
    `void` | `extractChild(PlanNode child)` Remove the child node from this node, and replace that child with its first child (if there is one).
    `void` | `extractFromParent()` Extract this node from its parent, but replace this node with its child (if there is one).
    `List<PlanNode>` | `findAllAtOrBelow()` Find all of the nodes that are at or below this node.
    `List<PlanNode>` | `findAllAtOrBelow(PlanNode.Traversal order)` Find all of the nodes that are at or below this node.
    `List<PlanNode>` | `findAllAtOrBelow(PlanNode.Traversal order, PlanNode.Type typeToFind)` Find all of the nodes of the specified type that are at or below this node.
    `List<PlanNode>` | `findAllAtOrBelow(PlanNode.Traversal order, PlanNode.Type firstTypeToFind, PlanNode.Type... additionalTypesToFind)` Find all of the nodes with one of the specified types that are at or below this node.
    `List<PlanNode>` | `findAllAtOrBelow(PlanNode.Traversal order, Set<PlanNode.Type> typesToFind)` Find all of the nodes with one of the specified types that are at or below this node.
    `List<PlanNode>` | `findAllAtOrBelow(PlanNode.Type typeToFind)` Find all of the nodes of the specified type that are at or below this node, using pre-order traversal.
    `List<PlanNode>` | `findAllAtOrBelow(PlanNode.Type firstTypeToFind, PlanNode.Type... additionalTypesToFind)` Find all of the nodes with one of the specified types that are at or below this node.
    `List<PlanNode>` | `findAllAtOrBelow(Set<PlanNode.Type> typesToFind)` Find all of the nodes with one of the specified types that are at or below this node.
    `List<PlanNode>` | `findAllFirstNodesAtOrBelow(PlanNode.Type typeToFind)` Look at nodes below this node, searching for nodes that have the supplied type.
    `PlanNode` | `findAncestor(PlanNode.Type typeToFind)` Starting at the parent of this node, find the lowest (also closest) ancestor that has the specified type.
    `PlanNode` | `findAncestor(PlanNode.Type firstTypeToFind, PlanNode.Type... additionalTypesToFind)` Starting at the parent of this node, find the lowest (also closest) ancestor that has one of the specified types.
    `PlanNode` | `findAncestor(Set<PlanNode.Type> typesToFind)` Starting at the parent of this node, find the lowest (also closest) ancestor that has one of the specified types.
    `PlanNode` | `findAtOrBelow(PlanNode.Traversal order, PlanNode.Type typeToFind)` Find the first node with the specified type that are at or below this node.
    `PlanNode` | `findAtOrBelow(PlanNode.Traversal order, PlanNode.Type firstTypeToFind, PlanNode.Type... additionalTypesToFind)` Find the first node with one of the specified types that are at or below this node.
    `PlanNode` | `findAtOrBelow(PlanNode.Traversal order, Set<PlanNode.Type> typesToFind)` Find the first node with one of the specified types that are at or below this node.
    `PlanNode` | `findAtOrBelow(PlanNode.Type typeToFind)` Find the first node with the specified type that are at or below this node.
    `PlanNode` | `findAtOrBelow(PlanNode.Type firstTypeToFind, PlanNode.Type... additionalTypesToFind)` Find the first node with one of the specified types that are at or below this node.
    `PlanNode` | `findAtOrBelow(Set<PlanNode.Type> typesToFind)` Find the first node with one of the specified types that are at or below this node.
    `PlanNode` | `getChild(int index)` Get the child at the supplied index.
    `int` | `getChildCount()` Get the number of child nodes.
    `List<PlanNode>` | `getChildren()` Get the unmodifiable list of child nodes.
    `PlanNode` | `getFirstChild()` Get the first child.
    `PlanNode` | `getLastChild()` Get the last child.
    `PlanNode` | `getParent()` Get the parent of this node.
    `LinkedList<PlanNode>` | `getPathTo(PlanNode descendant)` Get the path from this node (inclusive) to the supplied descendant node (inclusive)
    `Object` | `getProperty(PlanNode.Property propertyId)` Get the node's value for this supplied property.
    `<ValueType> ValueType` | `getProperty(PlanNode.Property propertyId, Class<ValueType> type)` Get the node's value for this supplied property, casting the result to the supplied type.
    `<ValueType> Collection<ValueType>` | `getPropertyAsCollection(PlanNode.Property propertyId, Class<ValueType> type)` Get the node's value for this supplied property, casting the result to a `Collection` of the supplied type.
    `<ValueType> List<ValueType>` | `getPropertyAsList(PlanNode.Property propertyId, Class<ValueType> type)` Get the node's value for this supplied property, casting the result to a `List` of the supplied type.
    `Set<PlanNode.Property>` | `getPropertyKeys()` Get the keys for the property values that are set on this node.
    `Set<SelectorName>` | `getSelectors()` Get the selectors that are referenced by this plan node.
    `String` | `getString()` Get the string representation of this query object.
    `PlanNode.Type` | `getType()` Get the type for this node.
    `boolean` | `hasAncestorOfType(PlanNode.Type type)` Determine whether this node has an ancestor with the supplied type.
    `boolean` | `hasAncestorOfType(PlanNode.Type firstType, PlanNode.Type... additionalTypes)` Determine whether this node has an ancestor with any of the supplied types.
    `boolean` | `hasAncestorOfType(Set<PlanNode.Type> types)` Determine whether this node has an ancestor with any of the supplied types.
    `boolean` | `hasBooleanProperty(PlanNode.Property propertyId)` Indicates if there is a non-null property value that equates to a `true` boolean value.
    `boolean` | `hasCollectionProperty(PlanNode.Property propertyId)` Indicates if there is a non-null and non-empty Collection value for the property.
    `int` | `hashCode()`
    `boolean` | `hasProperty(PlanNode.Property propertyId)` Indicates if there is a non-null value for the property.
    `void` | `insertAsParent(PlanNode newParent)` Insert the supplied node into the plan node tree immediately above this node.
    `boolean` | `is(PlanNode.Type type)` Return true if this node's type does match the supplied type
    `boolean` | `isAbove(PlanNode possibleDescendant)` Determine if the supplied node is a descendant of this node.
    `boolean` | `isBelow(PlanNode possibleAncestor)` Determine if the supplied node is an ancestor of this node.
    `boolean` | `isNot(PlanNode.Type type)` Return true if this node's type does not match the supplied type
    `boolean` | `isNotOneOf(PlanNode.Type first, PlanNode.Type... rest)` Return true if this node's type does not match any of the supplied types
    `boolean` | `isNotOneOf(Set<PlanNode.Type> types)` Return true if this node's type does not match any of the supplied types
    `boolean` | `isOneOf(PlanNode.Type first, PlanNode.Type... rest)` Return true if this node's type matches one of the supplied types
    `boolean` | `isOneOf(Set<PlanNode.Type> types)` Return true if this node's type matches one of the supplied types
    `boolean` | `isSameAs(PlanNode other)` Determine whether the supplied plan is equivalent to this plan.
    `Iterator<PlanNode>` | `iterator()`
    `void` | `orderChildren(Comparator<PlanNode> comparator)`
    `void` | `orderChildren(PlanNode.Type type, Comparator<PlanNode> comparator)`
    `List<PlanNode>` | `removeAllChildren()` Remove all children from this node.
    `boolean` | `removeChild(PlanNode child)` Remove the node from this node.
    `PlanNode` | `removeFromParent()` Remove this node from its parent, and return the node that used to be the parent of this node.
    `Object` | `removeProperty(Object propertyId)` Remove the node's value for this supplied property.
    `boolean` | `replaceChild(PlanNode child, PlanNode replacement)` Replace the supplied child with another node.
    `void` | `setParent(PlanNode parent)` Set the parent for this node.
    `Object` | `setProperty(PlanNode.Property propertyId, Object value)` Set the node's value for the supplied property.
    `void` | `setType(PlanNode.Type type)` Set the type for this node.
    `String` | `toString()`

    - ### Methods inherited from class java.lang.Object

      `finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### PlanNode

          public PlanNode(PlanNode.Type type)

      Create a new plan node with the supplied initial type.
      Parameters:
        `type` - the type of the node; may not be null

    - #### PlanNode

          public PlanNode(PlanNode.Type type,
                  PlanNode parent)

      Create a new plan node with the supplied initial type ad that is a child of the supplied parent.
      Parameters:
        `type` - the type of the node; may not be null
        `parent` - the parent node, or null if there is no parent

    - #### PlanNode

          public PlanNode(PlanNode.Type type,
                  SelectorName... selectors)

      Create a new plan node with the supplied initial type ad that is a child of the supplied parent.
      Parameters:
        `type` - the type of the node; may not be null
        `selectors` - the selectors that should be assigned to this node

    - #### PlanNode

          public PlanNode(PlanNode.Type type,
                  Iterable<SelectorName> selectors)

      Create a new plan node with the supplied initial type ad that is a child of the supplied parent.
      Parameters:
        `type` - the type of the node; may not be null
        `selectors` - the selectors that should be assigned to this node

    - #### PlanNode

          public PlanNode(PlanNode.Type type,
                  PlanNode parent,
                  SelectorName... selectors)

      Create a new plan node with the supplied initial type ad that is a child of the supplied parent.
      Parameters:
        `type` - the type of the node; may not be null
        `parent` - the parent node, or null if there is no parent
        `selectors` - the selectors that should be assigned to this node

    - #### PlanNode

          public PlanNode(PlanNode.Type type,
                  PlanNode parent,
                  Iterable<SelectorName> selectors)

      Create a new plan node with the supplied initial type ad that is a child of the supplied parent.
      Parameters:
        `type` - the type of the node; may not be null
        `parent` - the parent node, or null if there is no parent
        `selectors` - the selectors that should be assigned to this node

  - ### Method Detail

    - #### getType

          public PlanNode.Type getType()

      Get the type for this node.
      Returns:
        the node type, or null if there is no node type

    - #### setType

          public void setType(PlanNode.Type type)

      Set the type for this node.
      Parameters:
        `type` - Sets type to the specified value; may not be null

    - #### isNot

          public boolean isNot(PlanNode.Type type)

      Return true if this node's type does not match the supplied type
      Parameters:
        `type` - the type to compare
      Returns:
        true if this node's type is different than that supplied, or false if they are the same

    - #### isNotOneOf

          public boolean isNotOneOf(PlanNode.Type first,
                           PlanNode.Type... rest)

      Return true if this node's type does not match any of the supplied types
      Parameters:
        `first` - the type to compare
        `rest` - the additional types to compare
      Returns:
        true if this node's type is different than all of those supplied, or false if matches one of the supplied types

    - #### isNotOneOf

          public boolean isNotOneOf(Set<PlanNode.Type> types)

      Return true if this node's type does not match any of the supplied types
      Parameters:
        `types` - the types to compare
      Returns:
        true if this node's type is different than all of those supplied, or false if matches one of the supplied types

    - #### is

          public boolean is(PlanNode.Type type)

      Return true if this node's type does match the supplied type
      Parameters:
        `type` - the type to compare
      Returns:
        true if this node's type is the same as that supplied, or false if the types are different

    - #### isOneOf

          public boolean isOneOf(PlanNode.Type first,
                        PlanNode.Type... rest)

      Return true if this node's type matches one of the supplied types
      Parameters:
        `first` - the type to compare
        `rest` - the additional types to compare
      Returns:
        true if this node's type is one of those supplied, or false otherwise

    - #### isOneOf

          public boolean isOneOf(Set<PlanNode.Type> types)

      Return true if this node's type matches one of the supplied types
      Parameters:
        `types` - the types to compare
      Returns:
        true if this node's type is one of those supplied, or false otherwise

    - #### isBelow

          public boolean isBelow(PlanNode possibleAncestor)

      Determine if the supplied node is an ancestor of this node.
      Parameters:
        `possibleAncestor` - the node that is to be determined if it is an ancestor
      Returns:
        true if the supplied node is indeed an ancestor, or false if it is not an ancestor

    - #### isAbove

          public boolean isAbove(PlanNode possibleDescendant)

      Determine if the supplied node is a descendant of this node.
      Parameters:
        `possibleDescendant` - the node that is to be determined if it is a descendant
      Returns:
        true if the supplied node is indeed an ancestor, or false if it is not an ancestor

    - #### getParent

          public PlanNode getParent()

      Get the parent of this node.
      Returns:
        the parent node, or null if this node has no parent

    - #### setParent

          public void setParent(PlanNode parent)

      Set the parent for this node. If this node already has a parent, this method will remove this node from the current parent. If the supplied parent is not null, then this node will be added to the supplied parent's children.
      Parameters:
        `parent` - the new parent, or null if this node is to have no parent

    - #### insertAsParent

          public void insertAsParent(PlanNode newParent)

      Insert the supplied node into the plan node tree immediately above this node. If this node has a parent when this method is called, the new parent essentially takes the place of this node within the list of children of the old parent. This method does nothing if the supplied new parent is null.

      For example, consider a plan node tree before this method is called:

                  A
                / | \
               /  |  \
              B   C   D

      Then after this method is called with `c.insertAsParent(e)`, the resulting plan node tree will be:

                  A
                / | \
               /  |  \
              B   E   D
                  |
                  |
                  C

      Also note that the node on which this method is called ('C' in the example above) will always be added as the `last child` to the new parent. This allows the new parent to already have children before this method is called.

      Parameters:
        `newParent` - the new parent; method does nothing if this is null

    - #### removeFromParent

          public PlanNode removeFromParent()

      Remove this node from its parent, and return the node that used to be the parent of this node. Note that this method removes the entire subgraph under this node.
      Returns:
        the node that was the parent of this node, or null if this node had no parent
      See Also:
        `extractChild(PlanNode)`, `extractFromParent()`

    - #### getChildren

          public List<PlanNode> getChildren()

      Get the unmodifiable list of child nodes. This list will immediately reflect any changes made to the children (via other methods), but this list cannot be used to add or remove children.
      Returns:
        the list of children, which immediately reflects changes but which cannot be modified directly; never null

    - #### iterator

          public Iterator<PlanNode> iterator()

      Specified by:
        `iterator` in interface `Iterable<PlanNode>`

    - #### removeAllChildren

          public List<PlanNode> removeAllChildren()

      Remove all children from this node. All nodes immediately become orphaned. The resulting list will be mutable.
      Returns:
        a copy of all the of the children that were removed (and which have no parent); never null

    - #### replaceChild

          public boolean replaceChild(PlanNode child,
                             PlanNode replacement)

      Replace the supplied child with another node. If the replacement is already a child of this node, this method effectively swaps the position of the child and replacement nodes.
      Parameters:
        `child` - the node that is already a child and that is to be replaced; may not be null and must be a child
        `replacement` - the node that is to replace the 'child' node; may not be null
      Returns:
        true if the child was successfully replaced

    - #### getChildCount

          public int getChildCount()

      Get the number of child nodes.
      Returns:
        the number of children; never negative

    - #### getFirstChild

          public PlanNode getFirstChild()

      Get the first child.
      Returns:
        the first child, or null if there are no children

    - #### getLastChild

          public PlanNode getLastChild()

      Get the last child.
      Returns:
        the last child, or null if there are no children

    - #### getChild

          public PlanNode getChild(int index)

      Get the child at the supplied index.
      Parameters:
        `index` - the index
      Returns:
        the child, or null if there are no children
      Throws:
        `IndexOutOfBoundsException` - if the index is not valid given the number of children

    - #### addFirstChild

          public void addFirstChild(PlanNode child)

      Add the supplied node to the front of the list of children.
      Parameters:
        `child` - the node that should be added as the first child; may not be null

    - #### addLastChild

          public void addLastChild(PlanNode child)

      Add the supplied node to the end of the list of children.
      Parameters:
        `child` - the node that should be added as the last child; may not be null

    - #### addChildren

          public void addChildren(Iterable<PlanNode> otherChildren)

      Add the supplied nodes at the end of the list of children.
      Parameters:
        `otherChildren` - the children to add; may not be null

    - #### addChildren

          public void addChildren(PlanNode first,
                         PlanNode second)

      Add the supplied nodes at the end of the list of children.
      Parameters:
        `first` - the first child to add
        `second` - the second child to add

    - #### addChildren

          public void addChildren(PlanNode first,
                         PlanNode second,
                         PlanNode third)

      Add the supplied nodes at the end of the list of children.
      Parameters:
        `first` - the first child to add
        `second` - the second child to add
        `third` - the third child to add

    - #### removeChild

          public boolean removeChild(PlanNode child)

      Remove the node from this node.
      Parameters:
        `child` - the child node; may not be null
      Returns:
        true if the child was removed from this node, or false if the supplied node was not a child of this node

    - #### extractChild

          public void extractChild(PlanNode child)

      Remove the child node from this node, and replace that child with its first child (if there is one).
      Parameters:
        `child` - the child to be extracted; may not be null and must have at most 1 child
      See Also:
        `extractFromParent()`

    - #### extractFromParent

          public void extractFromParent()

      Extract this node from its parent, but replace this node with its child (if there is one).
      See Also:
        `extractChild(PlanNode)`

    - #### getPropertyKeys

          public Set<PlanNode.Property> getPropertyKeys()

      Get the keys for the property values that are set on this node.
      Returns:
        the property keys; never null but possibly empty

    - #### getProperty

          public Object getProperty(PlanNode.Property propertyId)

      Get the node's value for this supplied property.
      Parameters:
        `propertyId` - the property identifier
      Returns:
        the value, or null if there is no property on this node

    - #### getProperty

          public <ValueType> ValueType getProperty(PlanNode.Property propertyId,
                                          Class<ValueType> type)

      Get the node's value for this supplied property, casting the result to the supplied type.
      Type Parameters:
        `ValueType` - the type of the value expected
      Parameters:
        `propertyId` - the property identifier
        `type` - the class denoting the type of value expected; may not be null
      Returns:
        the value, or null if there is no property on this node

    - #### getPropertyAsCollection

          public <ValueType> Collection<ValueType> getPropertyAsCollection(PlanNode.Property propertyId,
                                                                  Class<ValueType> type)

      Get the node's value for this supplied property, casting the result to a `Collection` of the supplied type.
      Type Parameters:
        `ValueType` - the type of the value expected
      Parameters:
        `propertyId` - the property identifier
        `type` - the class denoting the type of value expected; may not be null
      Returns:
        the value, or null if there is no property on this node

    - #### getPropertyAsList

          public <ValueType> List<ValueType> getPropertyAsList(PlanNode.Property propertyId,
                                                      Class<ValueType> type)

      Get the node's value for this supplied property, casting the result to a `List` of the supplied type.
      Type Parameters:
        `ValueType` - the type of the value expected
      Parameters:
        `propertyId` - the property identifier
        `type` - the class denoting the type of value expected; may not be null
      Returns:
        the value, or null if there is no property on this node

    - #### setProperty

          public Object setProperty(PlanNode.Property propertyId,
                           Object value)

      Set the node's value for the supplied property.
      Parameters:
        `propertyId` - the property identifier
        `value` - the value, or null if the property is to be removed
      Returns:
        the previous value that was overwritten by this call, or null if there was prior value

    - #### removeProperty

          public Object removeProperty(Object propertyId)

      Remove the node's value for this supplied property.
      Parameters:
        `propertyId` - the property identifier
      Returns:
        the value that was removed, or null if there was no property on this node

    - #### hasProperty

          public boolean hasProperty(PlanNode.Property propertyId)

      Indicates if there is a non-null value for the property.
      Parameters:
        `propertyId` - the property identifier
      Returns:
        true if this node has a non-null value for that property, or false if the value is null or there is no property

    - #### hasCollectionProperty

          public boolean hasCollectionProperty(PlanNode.Property propertyId)

      Indicates if there is a non-null and non-empty Collection value for the property.
      Parameters:
        `propertyId` - the property identifier
      Returns:
        true if this node has value for the supplied property and that value is a non-empty Collection

    - #### hasBooleanProperty

          public boolean hasBooleanProperty(PlanNode.Property propertyId)

      Indicates if there is a non-null property value that equates to a `true` boolean value.
      Parameters:
        `propertyId` - the property identifier
      Returns:
        true if this node has value for the supplied property and that value is a boolean value of `true`

    - #### addSelector

          public void addSelector(SelectorName symbol)

      Add a selector to this plan node. This method does nothing if the supplied selector is null.
      Parameters:
        `symbol` - the symbol of the selector

    - #### addSelector

          public void addSelector(SelectorName first,
                         SelectorName second)

      Add the selectors to this plan node. This method does nothing for any supplied selector that is null.
      Parameters:
        `first` - the first symbol to be added
        `second` - the second symbol to be added

    - #### addSelectors

          public void addSelectors(Iterable<SelectorName> names)

      Add the selectors to this plan node. This method does nothing for any supplied selector that is null.
      Parameters:
        `names` - the symbols to be added

    - #### getSelectors

          public Set<SelectorName> getSelectors()

      Get the selectors that are referenced by this plan node.
      Returns:
        the names of the selectors; never null but possibly empty

    - #### getPathTo

          public LinkedList<PlanNode> getPathTo(PlanNode descendant)

      Get the path from this node (inclusive) to the supplied descendant node (inclusive)
      Parameters:
        `descendant` - the descendant; may not be null, and must be a descendant of this node
      Returns:
        the path from this node to the supplied descendant node; never null

    - #### hasAncestorOfType

          public boolean hasAncestorOfType(PlanNode.Type type)

      Determine whether this node has an ancestor with the supplied type.
      Parameters:
        `type` - the type; may not be null
      Returns:
        true if there is at least one ancestor of the supplied type, or false otherwise

    - #### hasAncestorOfType

          public boolean hasAncestorOfType(PlanNode.Type firstType,
                                  PlanNode.Type... additionalTypes)

      Determine whether this node has an ancestor with any of the supplied types.
      Parameters:
        `firstType` - the first type; may not be null
        `additionalTypes` - the additional types; may not be null
      Returns:
        true if there is at least one ancestor that has any of the supplied types, or false otherwise

    - #### hasAncestorOfType

          public boolean hasAncestorOfType(Set<PlanNode.Type> types)

      Determine whether this node has an ancestor with any of the supplied types.
      Parameters:
        `types` - the types; may not be null
      Returns:
        true if there is at least one ancestor that has any of the supplied types, or false otherwise

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `Object`

    - #### equals

          public final boolean equals(Object obj)

      Overrides:
        `equals` in class `Object`

    - #### clone

          public PlanNode clone()

      This class returns a new clone of the plan tree rooted at this node. However, the top node of the resulting plan tree (that is, the node returned from this method) has no parent.

      Overrides:
        `clone` in class `Object`
      See Also:
        `Object.clone()`

    - #### cloneWithoutNewParent

          protected PlanNode cloneWithoutNewParent()

    - #### isSameAs

          public boolean isSameAs(PlanNode other)

      Determine whether the supplied plan is equivalent to this plan.
      Parameters:
        `other` - the other plan to compare with this instance
      Returns:
        true if the two plans are equivalent, or false otherwise

    - #### getString

          public String getString()

      Description copied from interface: `Readable`
      Get the string representation of this query object.
      Specified by:
        `getString` in interface `Readable`
      Returns:
        the string representation; never null

    - #### findAncestor

          public PlanNode findAncestor(PlanNode.Type typeToFind)

      Starting at the parent of this node, find the lowest (also closest) ancestor that has the specified type.
      Parameters:
        `typeToFind` - the type of the node to find; may not be null
      Returns:
        the node with the specified type, or null if there is no such ancestor

    - #### findAncestor

          public PlanNode findAncestor(PlanNode.Type firstTypeToFind,
                              PlanNode.Type... additionalTypesToFind)

      Starting at the parent of this node, find the lowest (also closest) ancestor that has one of the specified types.
      Parameters:
        `firstTypeToFind` - the first type to find; may not be null
        `additionalTypesToFind` - additional types to find; may not be null
      Returns:
        the node with the specified type, or null if there is no such ancestor

    - #### findAncestor

          public PlanNode findAncestor(Set<PlanNode.Type> typesToFind)

      Starting at the parent of this node, find the lowest (also closest) ancestor that has one of the specified types.
      Parameters:
        `typesToFind` - the set of types to find; may not be null
      Returns:
        the node with one of the specified types, or null if there is no such ancestor

    - #### findAllFirstNodesAtOrBelow

          public List<PlanNode> findAllFirstNodesAtOrBelow(PlanNode.Type typeToFind)

      Look at nodes below this node, searching for nodes that have the supplied type. As soon as a node with a matching type is found, then no other nodes below it are searched.
      Parameters:
        `typeToFind` - the type of node to find; may not be null
      Returns:
        the collection of nodes that are at or below this node that all have the supplied type; never null but possibly empty

    - #### apply

          public void apply(PlanNode.Traversal order,
                   PlanNode.Operation operation,
                   PlanNode.Type type)

      Walk the plan tree starting in the specified traversal order, and apply the supplied operation to every plan node with a type that matches the given type.
      Parameters:
        `order` - the order in which the subtree should be traversed; may not be null
        `operation` - the operation that should be applied; may not be null
        `type` - the type of node to which the operation should be applied; may not be null

    - #### apply

          public void apply(PlanNode.Traversal order,
                   PlanNode.Operation operation,
                   PlanNode.Type firstType,
                   PlanNode.Type... additionalTypes)

      Walk the plan tree starting in the specified traversal order, and apply the supplied operation to every plan node that is one of the supplied types.
      Parameters:
        `order` - the order in which the subtree should be traversed; may not be null
        `operation` - the operation that should be applied; may not be null
        `firstType` - the first type of node to which the operation should be applied; may not be null
        `additionalTypes` - the additional types of nodes to which the operation should be applied; may not be null

    - #### apply

          public void apply(PlanNode.Traversal order,
                   PlanNode.Operation operation,
                   Set<PlanNode.Type> types)

      Walk the plan tree starting in the specified traversal order, and apply the supplied operation to every plan node that is one of the supplied types.
      Parameters:
        `order` - the order in which the subtree should be traversed; may not be null
        `operation` - the operation that should be applied; may not be null
        `types` - the types of nodes to which the operation should be applied; may not be null

    - #### apply

          public void apply(PlanNode.Traversal order,
                   PlanNode.Operation operation)

      Walk the plan tree starting in the specified traversal order, and apply the supplied operation to every plan node.
      Parameters:
        `order` - the order in which the subtree should be traversed; may not be null
        `operation` - the operation that should be applied; may not be null

    - #### applyLevelOrder

          protected void applyLevelOrder(PlanNode.Traversal order,
                             PlanNode.Operation operation)

    - #### applyToAncestorsUpTo

          public void applyToAncestorsUpTo(PlanNode.Type stopType,
                                  PlanNode.Operation operation)

      Apply the operation to all ancestor nodes below a node of the given type.
      Parameters:
        `stopType` - the type of node that should not be included in the results; may not be null
        `operation` - the operation to apply to each of the ancestor nodes below the given type; may not be null

    - #### findAllAtOrBelow

          public List<PlanNode> findAllAtOrBelow()

      Find all of the nodes that are at or below this node.
      Returns:
        the collection of nodes that are at or below this node; never null and never empty

    - #### findAllAtOrBelow

          public List<PlanNode> findAllAtOrBelow(PlanNode.Traversal order)

      Find all of the nodes that are at or below this node.
      Parameters:
        `order` - the order to traverse; may not be null
      Returns:
        the collection of nodes that are at or below this node; never null and never empty

    - #### findAllAtOrBelow

          public List<PlanNode> findAllAtOrBelow(PlanNode.Type typeToFind)

      Find all of the nodes of the specified type that are at or below this node, using pre-order traversal.
      Parameters:
        `typeToFind` - the type of node to find; may not be null
      Returns:
        the collection of nodes that are at or below this node that all have the supplied type; never null but possibly empty

    - #### findAllAtOrBelow

          public List<PlanNode> findAllAtOrBelow(PlanNode.Type firstTypeToFind,
                                        PlanNode.Type... additionalTypesToFind)

      Find all of the nodes with one of the specified types that are at or below this node.
      Parameters:
        `firstTypeToFind` - the first type of node to find; may not be null
        `additionalTypesToFind` - the additional types of node to find; may not be null
      Returns:
        the collection of nodes that are at or below this node that all have one of the supplied types; never null but possibly empty

    - #### findAllAtOrBelow

          public List<PlanNode> findAllAtOrBelow(Set<PlanNode.Type> typesToFind)

      Find all of the nodes with one of the specified types that are at or below this node.
      Parameters:
        `typesToFind` - the types of node to find; may not be null
      Returns:
        the collection of nodes that are at or below this node that all have one of the supplied types; never null but possibly empty

    - #### findAllAtOrBelow

          public List<PlanNode> findAllAtOrBelow(PlanNode.Traversal order,
                                        PlanNode.Type typeToFind)

      Find all of the nodes of the specified type that are at or below this node.
      Parameters:
        `order` - the order to traverse; may not be null
        `typeToFind` - the type of node to find; may not be null
      Returns:
        the collection of nodes that are at or below this node that all have the supplied type; never null but possibly empty

    - #### findAllAtOrBelow

          public List<PlanNode> findAllAtOrBelow(PlanNode.Traversal order,
                                        PlanNode.Type firstTypeToFind,
                                        PlanNode.Type... additionalTypesToFind)

      Find all of the nodes with one of the specified types that are at or below this node.
      Parameters:
        `order` - the order to traverse; may not be null
        `firstTypeToFind` - the first type of node to find; may not be null
        `additionalTypesToFind` - the additional types of node to find; may not be null
      Returns:
        the collection of nodes that are at or below this node that all have one of the supplied types; never null but possibly empty

    - #### findAllAtOrBelow

          public List<PlanNode> findAllAtOrBelow(PlanNode.Traversal order,
                                        Set<PlanNode.Type> typesToFind)

      Find all of the nodes with one of the specified types that are at or below this node.
      Parameters:
        `order` - the order to traverse; may not be null
        `typesToFind` - the types of node to find; may not be null
      Returns:
        the collection of nodes that are at or below this node that all have one of the supplied types; never null but possibly empty

    - #### findAtOrBelow

          public PlanNode findAtOrBelow(PlanNode.Type typeToFind)

      Find the first node with the specified type that are at or below this node.
      Parameters:
        `typeToFind` - the type of node to find; may not be null
      Returns:
        the first node that is at or below this node that has the supplied type; or null if there is no such node

    - #### findAtOrBelow

          public PlanNode findAtOrBelow(PlanNode.Type firstTypeToFind,
                               PlanNode.Type... additionalTypesToFind)

      Find the first node with one of the specified types that are at or below this node.
      Parameters:
        `firstTypeToFind` - the first type of node to find; may not be null
        `additionalTypesToFind` - the additional types of node to find; may not be null
      Returns:
        the first node that is at or below this node that has one of the supplied types; or null if there is no such node

    - #### findAtOrBelow

          public PlanNode findAtOrBelow(Set<PlanNode.Type> typesToFind)

      Find the first node with one of the specified types that are at or below this node.
      Parameters:
        `typesToFind` - the types of node to find; may not be null
      Returns:
        the first node that is at or below this node that has one of the supplied types; or null if there is no such node

    - #### findAtOrBelow

          public PlanNode findAtOrBelow(PlanNode.Traversal order,
                               PlanNode.Type typeToFind)

      Find the first node with the specified type that are at or below this node.
      Parameters:
        `order` - the order to traverse; may not be null
        `typeToFind` - the type of node to find; may not be null
      Returns:
        the first node that is at or below this node that has the supplied type; or null if there is no such node

    - #### findAtOrBelow

          public PlanNode findAtOrBelow(PlanNode.Traversal order,
                               PlanNode.Type firstTypeToFind,
                               PlanNode.Type... additionalTypesToFind)

      Find the first node with one of the specified types that are at or below this node.
      Parameters:
        `order` - the order to traverse; may not be null
        `firstTypeToFind` - the first type of node to find; may not be null
        `additionalTypesToFind` - the additional types of node to find; may not be null
      Returns:
        the first node that is at or below this node that has one of the supplied types; or null if there is no such node

    - #### findAtOrBelow

          public PlanNode findAtOrBelow(PlanNode.Traversal order,
                               Set<PlanNode.Type> typesToFind)

      Find the first node with one of the specified types that are at or below this node.
      Parameters:
        `order` - the order to traverse; may not be null
        `typesToFind` - the types of node to find; may not be null
      Returns:
        the first node that is at or below this node that has one of the supplied types; or null if there is no such node

    - #### orderChildren

          public void orderChildren(Comparator<PlanNode> comparator)

    - #### orderChildren

          public void orderChildren(PlanNode.Type type,
                           Comparator<PlanNode> comparator)

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