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## org.modeshape.graph.property
Interface NamespaceRegistry

All Known Implementing Classes:
  JcrNamespaceRegistry

    @ThreadSafe
    public interface NamespaceRegistry

Registry of namespaces, which are used to provide isolated and independent domains for `names`.

Nested Class Summary
`static interface` | `NamespaceRegistry.Namespace` Representation of a single namespace at a single point in time.

Method Summary
`String` | `getDefaultNamespaceUri()` Return the namespace URI that is currently mapped to the empty prefix, or null if there is no current default namespace.
`String` | `getNamespaceForPrefix(String prefix)` Get the namespace URI for the supplied prefix.
`Set<NamespaceRegistry.Namespace>` | `getNamespaces()` Obtain a snapshot of all of the `namespaces` registered at the time this method is called.
`String` | `getPrefixForNamespaceUri(String namespaceUri, boolean generateIfMissing)` Return the prefix used for the supplied namespace URI.
`Set<String>` | `getRegisteredNamespaceUris()` Obtain the set of namespaces that are registered.
`boolean` | `isRegisteredNamespaceUri(String namespaceUri)` Return whether there is a registered prefix for the supplied namespace URI.
`void` | `register(Iterable<NamespaceRegistry.Namespace> namespaces)`
`String` | `register(String prefix, String namespaceUri)` Register a new namespace using the supplied prefix, returning the namespace URI previously registered under that prefix.
`boolean` | `unregister(String namespaceUri)` Unregister the namespace with the supplied URI.

Method Detail

### getDefaultNamespaceUri

    String getDefaultNamespaceUri()

  Return the namespace URI that is currently mapped to the empty prefix, or null if there is no current default namespace.

  Returns:
    the namespace URI that represents the default namespace, or null if there is no default namespace

### getNamespaceForPrefix

    String getNamespaceForPrefix(String prefix)

  Get the namespace URI for the supplied prefix.

  Parameters:
    `prefix` - the namespace prefix
  Returns:
    the namespace URI for the supplied prefix, or null if there is no namespace currently registered to use that prefix
  Throws:
    `IllegalArgumentException` - if the prefix is null

### getPrefixForNamespaceUri

    String getPrefixForNamespaceUri(String namespaceUri,
                                    boolean generateIfMissing)

  Return the prefix used for the supplied namespace URI.

  Parameters:
    `namespaceUri` - the namespace URI
    `generateIfMissing` - true if the namespace URI has not already been registered and the method should auto-register the namespace with a generated prefix, or false if the method should never auto-register the namespace
  Returns:
    the prefix currently being used for the namespace, or `null` if the namespace has not been registered and `generateIfMissing` is `false`
  Throws:
    `IllegalArgumentException` - if the namespace URI is null
  See Also:
    `isRegisteredNamespaceUri(String)`

### isRegisteredNamespaceUri

    boolean isRegisteredNamespaceUri(String namespaceUri)

  Return whether there is a registered prefix for the supplied namespace URI.

  Parameters:
    `namespaceUri` - the namespace URI
  Returns:
    true if the supplied namespace has been registered with a prefix, or false otherwise
  Throws:
    `IllegalArgumentException` - if the namespace URI is null

### register

    String register(String prefix,
                    String namespaceUri)

  Register a new namespace using the supplied prefix, returning the namespace URI previously registered under that prefix.

  Parameters:
    `prefix` - the prefix for the namespace, or null if a namesapce prefix should be generated automatically
    `namespaceUri` - the namespace URI
  Returns:
    the namespace URI that was previously registered with the supplied prefix, or null if the prefix was not previously bound to a namespace URI
  Throws:
    `IllegalArgumentException` - if the namespace URI is null

### register

    void register(Iterable<NamespaceRegistry.Namespace> namespaces)

### unregister

    boolean unregister(String namespaceUri)

  Unregister the namespace with the supplied URI.

  Parameters:
    `namespaceUri` - the namespace URI
  Returns:
    true if the namespace was removed, or false if the namespace was not registered
  Throws:
    `IllegalArgumentException` - if the namespace URI is null
    `NamespaceException` - if there is a problem unregistering the namespace

### getRegisteredNamespaceUris

    Set<String> getRegisteredNamespaceUris()

  Obtain the set of namespaces that are registered.

  Returns:
    the set of

### getNamespaces

    Set<NamespaceRegistry.Namespace> getNamespaces()

  Obtain a snapshot of all of the `namespaces` registered at the time this method is called. The resulting set is immutable, and will not reflect changes made to the registry.

  Returns:
    an immutable set of `NamespaceRegistry.Namespace` objects reflecting a snapshot of the registry; never null

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