Package nu.xom

Class XPathContext

java.lang.Object
nu.xom.XPathContext

public final class XPathContext extends Object

Provides namespace prefix bindings for use in an XPath expression.

Version:
1.3.1
Author:
Elliotte Rusty Harold
  • Constructor Details

    • 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 Details

    • 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