/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// $Id: JAXPPrefixResolver.java,v 1.1.2.1 2005/08/01 01:30:18 jeffsuttor Exp $
package com.sun.org.apache.xpath.internal.jaxp;
import org.w3c.dom.Node;
import org.w3c.dom.NamedNodeMap;
import com.sun.org.apache.xml.internal.utils.PrefixResolver;
import javax.xml.namespace.NamespaceContext;
/**
* <meta name="usage" content="general"/>
* This class implements a Default PrefixResolver which
* can be used to perform prefix-to-namespace lookup
* for the XPath object.
* This class delegates the resolution to the passed NamespaceContext
*/
public class JAXPPrefixResolver implements PrefixResolver
{
private NamespaceContext namespaceContext;
public JAXPPrefixResolver ( NamespaceContext nsContext ) {
this.namespaceContext = nsContext;
}
public String getNamespaceForPrefix( String prefix ) {
return namespaceContext.getNamespaceURI( prefix );
}
/**
* Return the base identifier.
*
* @return null
*/
public String getBaseIdentifier() {
return null;
}
/**
* @see PrefixResolver#handlesNullPrefixes()
*/
public boolean handlesNullPrefixes() {
return false;
}
/**
* The URI for the XML namespace.
* (Duplicate of that found in com.sun.org.apache.xpath.internal.XPathContext).
*/
public static final String S_XMLNAMESPACEURI =
"http://www.w3.org/XML/1998/namespace";
/**
* Given a prefix and a Context Node, get the corresponding namespace.
* 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;
}
}