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## nu.xom
Class XPathContext

    Object
      nu.xom.XPathContext

    public final class XPathContext

extends Object

Provides namespace prefix bindings for use in an XPath expression.

Version:
  1.2b2
Author:
  Elliotte Rusty Harold

Constructor Summary
`XPathContext()` Creates a new XPath context that binds the `xml` prefix to the URI `http://www.w3.org/XML/1998/namespace`.
`XPathContext(String prefix, String uri)` Creates a new XPath context that binds the specified prefix to the specified URI.

Method Summary
`void` | `addNamespace(String prefix, String uri)` Binds the specified prefix to the specified namespace URI.
`String` | `lookup(String prefix)` Returns the namespace URI associated with a specified prefix in this context.
`static XPathContext` | `makeNamespaceContext(Element element)` Creates a new XPath context that contains all the namespace bindings in scope on the element.

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

Constructor Detail

### XPathContext

    public XPathContext(String prefix,
                        String uri)

  Creates a new XPath context that binds the specified prefix to the specified URI. The `xml` prefix is also bound to the URI `http://www.w3.org/XML/1998/namespace`.

  Parameters:
    `prefix` - the prefix to bind
    `uri` - the namespace URI the prefix is bound to

### XPathContext

    public XPathContext()

  Creates a new XPath context that binds the `xml` prefix to the URI `http://www.w3.org/XML/1998/namespace`.

Method Detail

### addNamespace

    public void addNamespace(String prefix,
                             String uri)

  Binds the specified prefix to the specified namespace URI. If the prefix is already bound in this context, the new URI replaces the old URI. Binding a prefix to null removes the declaration. The binding of the `xml` prefix may not be changed.

  Parameters:
    `prefix` - the prefix to bind
    `uri` - the namespace URI the prefix is bound to
  Throws:
    `NamespaceConflictException` - if the prefix is `xml` and the URI is not `http://www.w3.org/XML/1998/namespace` or the prefix is the empty string
    `NullPointerException` - if the prefix is null

### makeNamespaceContext

    public static XPathContext makeNamespaceContext(Element element)

  Creates a new XPath context that contains all the namespace bindings in scope on the element. Changing the prefixes in scope on the element after the context is returned does not change the context.

  Parameters:
    `element` - the element whose namespace bindings are copied
  Returns:
    all the namespace prefix mappings in scope on the element

### lookup

    public String lookup(String prefix)

  Returns the namespace URI associated with a specified prefix in this context. It returns null if this prefix is not bound to a namespace in this context. The prefix is not checked for validity. If you pass in a prefix that is not an NCName, this method simply returns null.

  Parameters:
    `prefix` - the prefix to look up
  Returns:
    the namespace URI associated with the specified prefix in this context or null

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Copyright 2002-2009 Elliotte Rusty Harold
elharo@ibiblio.org