org.apache.xpath.jaxp.JAXPPrefixResolver Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of serializer Show documentation
Show all versions of serializer Show documentation
Serializer to write out XML, HTML etc. as a stream of characters from an input DOM or from input
SAX events.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 468655 2006-10-28 07:12:06Z minchau $
package org.apache.xpath.jaxp;
import org.w3c.dom.Node;
import org.w3c.dom.NamedNodeMap;
import org.apache.xml.utils.PrefixResolver;
import javax.xml.namespace.NamespaceContext;
/**
*
* 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 org.apache.xpath.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;
}
}