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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * 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.
 */
package org.apache.xml.security.utils;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.xml.namespace.NamespaceContext;

import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 */
public class DOMNamespaceContext implements NamespaceContext {
    
    private Map namespaceMap = new HashMap();
    
    public DOMNamespaceContext(Node contextNode) {
        addNamespaces(contextNode);
    }
    
    public String getNamespaceURI(String arg0) {
        return namespaceMap.get(arg0);
    }

    public String getPrefix(String arg0) {
        for (String key : namespaceMap.keySet()) {
            String value = namespaceMap.get(key);
            if (value.equals(arg0)) {
                return key;
            }
        }
        return null;
    }

    public Iterator getPrefixes(String arg0) {
        return namespaceMap.keySet().iterator();
    }
    
    private void addNamespaces(Node element) {
        if (element.getParentNode() != null) {
            addNamespaces(element.getParentNode());
        }
        if (element instanceof Element) {
            Element el = (Element)element;
            NamedNodeMap map = el.getAttributes();
            for (int x = 0; x < map.getLength(); x++) {
                Attr attr = (Attr)map.item(x);
                if ("xmlns".equals(attr.getPrefix())) {
                    namespaceMap.put(attr.getLocalName(), attr.getValue());
                }
            }
        }
    }
}