Xerces2 Implementation: Class DefaultNamespaceContext

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## org.apache.xerces.stax
Class DefaultNamespaceContext

    java.lang.Object
      |
      +--org.apache.xerces.stax.DefaultNamespaceContext

All Implemented Interfaces:
  javax.xml.namespace.NamespaceContext

public final class DefaultNamespaceContext
extends java.lang.Object
implements javax.xml.namespace.NamespaceContext

A `NamespaceContext` which only contains bindings for the xml and xmlns prefixes.

# INTERNAL:

  Usage of this class is not supported. It may be altered or removed at any time.

Version:
  $Id: DefaultNamespaceContext.java 730672 2009-01-02 06:15:08Z mrglavas $
Author:
  Michael Glavassevich, IBM

Method Summary
`static DefaultNamespaceContext` | `getInstance()` Returns the one and only instance of this class.
`java.lang.String` | `getNamespaceURI(java.lang.String prefix)` Get Namespace URI bound to a prefix in the current scope.
`java.lang.String` | `getPrefix(java.lang.String namespaceURI)` Get prefix bound to Namespace URI in the current scope.
`java.util.Iterator` | `getPrefixes(java.lang.String namespaceURI)` Get all prefixes bound to a Namespace URI in the current scope.

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

Method Detail

### getInstance

    public static DefaultNamespaceContext getInstance()

  Returns the one and only instance of this class.

### getNamespaceURI

    public java.lang.String getNamespaceURI(java.lang.String prefix)

  Description copied from interface: `javax.xml.namespace.NamespaceContext`

  Get Namespace URI bound to a prefix in the current scope.

  When requesting a Namespace URI by prefix, the following table describes the returned Namespace URI value for all possible prefix values:

  `getNamespaceURI(prefix)` return value for specified prefixes
  prefix parameter | Namespace URI return value
  `DEFAULT_NS_PREFIX` ("") | default Namespace URI in the current scope or ``XMLConstants.NULL_NS_URI("")`` when there is no default Namespace URI in the current scope
  bound prefix | Namespace URI bound to prefix in current scope
  unbound prefix | ``XMLConstants.NULL_NS_URI("")``
  `XMLConstants.XML_NS_PREFIX` ("xml") | `XMLConstants.XML_NS_URI` ("http://www.w3.org/XML/1998/namespace")
  `XMLConstants.XMLNS_ATTRIBUTE` ("xmlns") | `XMLConstants.XMLNS_ATTRIBUTE_NS_URI` ("http://www.w3.org/2000/xmlns/")
  `null` | `IllegalArgumentException` is thrown

  Specified by:
    `getNamespaceURI` in interface `javax.xml.namespace.NamespaceContext`
  Following copied from interface: `javax.xml.namespace.NamespaceContext`
  Parameters:
    `prefix` - prefix to look up
  Returns:
    Namespace URI bound to prefix in the current scope

### getPrefix

    public java.lang.String getPrefix(java.lang.String namespaceURI)

  Description copied from interface: `javax.xml.namespace.NamespaceContext`

  Get prefix bound to Namespace URI in the current scope.

  To get all prefixes bound to a Namespace URI in the current scope, use `NamespaceContext.getPrefixes(String namespaceURI)`.

  When requesting a prefix by Namespace URI, the following table describes the returned prefix value for all Namespace URI values:

  `getPrefix(namespaceURI)` return value for specified Namespace URIs
  Namespace URI parameter | prefix value returned
  <default Namespace URI> | `XMLConstants.DEFAULT_NS_PREFIX` ("")
  bound Namespace URI | prefix bound to Namespace URI in the current scope, if multiple prefixes are bound to the Namespace URI in the current scope, a single arbitrary prefix, whose choice is implementation dependent, is returned
  unbound Namespace URI | `null`
  `XMLConstants.XML_NS_URI` ("http://www.w3.org/XML/1998/namespace") | `XMLConstants.XML_NS_PREFIX` ("xml")
  `XMLConstants.XMLNS_ATTRIBUTE_NS_URI` ("http://www.w3.org/2000/xmlns/") | `XMLConstants.XMLNS_ATTRIBUTE` ("xmlns")
  `null` | `IllegalArgumentException` is thrown

  Specified by:
    `getPrefix` in interface `javax.xml.namespace.NamespaceContext`
  Following copied from interface: `javax.xml.namespace.NamespaceContext`
  Parameters:
    `namespaceURI` - URI of Namespace to lookup
  Returns:
    prefix bound to Namespace URI in current context

### getPrefixes

    public java.util.Iterator getPrefixes(java.lang.String namespaceURI)

  Description copied from interface: `javax.xml.namespace.NamespaceContext`

  Get all prefixes bound to a Namespace URI in the current scope.

  An Iterator over String elements is returned in an arbitrary, implementation dependent, order.

  The `Iterator` is not modifiable. e.g. the `remove()` method will throw `UnsupportedOperationException`.

  When requesting prefixes by Namespace URI, the following table describes the returned prefixes value for all Namespace URI values:

  `getPrefixes(namespaceURI)` return value for specified Namespace URIs
  Namespace URI parameter | prefixes value returned
  bound Namespace URI, including the <default Namespace URI> | `Iterator` over prefixes bound to Namespace URI in the current scope in an arbitrary, implementation dependent, order
  unbound Namespace URI | empty `Iterator`
  `XMLConstants.XML_NS_URI` ("http://www.w3.org/XML/1998/namespace") | `Iterator` with one element set to `XMLConstants.XML_NS_PREFIX` ("xml")
  `XMLConstants.XMLNS_ATTRIBUTE_NS_URI` ("http://www.w3.org/2000/xmlns/") | `Iterator` with one element set to `XMLConstants.XMLNS_ATTRIBUTE` ("xmlns")
  `null` | `IllegalArgumentException` is thrown

  Specified by:
    `getPrefixes` in interface `javax.xml.namespace.NamespaceContext`
  Following copied from interface: `javax.xml.namespace.NamespaceContext`
  Parameters:
    `namespaceURI` - URI of Namespace to lookup
  Returns:
    `Iterator` for all prefixes bound to the Namespace URI in the current scope

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