/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, Lotus
* Development Corporation., http://www.lotus.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.xml.utils;
import org.w3c.dom.Node;
import org.w3c.dom.NamedNodeMap;
/**
* <meta name="usage" content="general"/>
* This class implements a generic PrefixResolver that
* can be used to perform prefix-to-namespace lookup
* for the XPath object.
*/
public class PrefixResolverDefault implements PrefixResolver
{
/**
* The context to resolve the prefix from, if the context
* is not given.
*/
Node m_context;
/**
* The URI for the XML namespace.
* (Duplicate of that found in org.apache.xpath.XPathContext).
*/
public static final String S_XMLNAMESPACEURI =
"http://www.w3.org/XML/1998/namespace";
/**
* Construct a PrefixResolverDefault object.
* @param xpathExpressionContext The context from
* which XPath expression prefixes will be resolved.
* Warning: This will not work correctly if xpathExpressionContext
* is an attribute node.
* @param xpathExpressionContext Node from which to start searching for a
* xmlns attribute that binds a prefix to a namespace (when the namespace
* context is not specified in the getNamespaceForPrefix call).
*/
public PrefixResolverDefault(Node xpathExpressionContext)
{
m_context = xpathExpressionContext;
}
/**
* Given a namespace, get the corrisponding prefix. This assumes that
* the PrevixResolver hold's it's own namespace context, or is a namespace
* context itself.
* @param prefix Prefix to resolve.
* @return Namespace that prefix resolves to, or null if prefix
* is not bound.
*/
public String getNamespaceForPrefix(String prefix)
{
return getNamespaceForPrefix(prefix, m_context);
}
/**
* Given a namespace, get the corrisponding prefix.
* Warning: This will not work correctly if namespaceContext
* is an attribute node.
* @param prefix Prefix to resolve.
* @param namespaceContext Node from which to start searching for a
* xmlns attribute that binds a prefix to a namespace.
* @return Namespace that prefix resolves to, or null if prefix
* is not bound.
*/
public String getNamespaceForPrefix(String prefix,
org.w3c.dom.Node namespaceContext)
{
Node parent = namespaceContext;
String namespace = null;
if (prefix.equals("xml"))
{
namespace = S_XMLNAMESPACEURI;
}
else
{
int type;
while ((null != parent) && (null == namespace)
&& (((type = parent.getNodeType()) == Node.ELEMENT_NODE)
|| (type == Node.ENTITY_REFERENCE_NODE)))
{
if (type == Node.ELEMENT_NODE)
{
NamedNodeMap nnm = parent.getAttributes();
for (int i = 0; i < nnm.getLength(); i++)
{
Node attr = nnm.item(i);
String aname = attr.getNodeName();
boolean isPrefix = aname.startsWith("xmlns:");
if (isPrefix || aname.equals("xmlns"))
{
int index = aname.indexOf(':');
String p = isPrefix ? aname.substring(index + 1) : "";
if (p.equals(prefix))
{
namespace = attr.getNodeValue();
break;
}
}
}
}
parent = parent.getParentNode();
}
}
return namespace;
}
/**
* Return the base identifier.
*
* @return null
*/
public String getBaseIdentifier()
{
return null;
}
}