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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 org.apache.xml.security.exceptions.XMLSecurityException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**@deprecated*/
public abstract class ElementCheckerImpl implements ElementChecker {
    
    public boolean isNamespaceElement(Node el, String type, String ns) {
        if ((el == null) ||
            ns != el.getNamespaceURI() || !el.getLocalName().equals(type)){
            return false;
        }

        return true;
    }
    
    /** A checker for DOM that interns NS */
    public static class InternedNsChecker extends ElementCheckerImpl {
        public void guaranteeThatElementInCorrectSpace(
            ElementProxy expected, Element actual
        ) throws XMLSecurityException {

            String expectedLocalname = expected.getBaseLocalName();
            String expectedNamespace = expected.getBaseNamespace();

            String localnameIS = actual.getLocalName();
            String namespaceIS = actual.getNamespaceURI();
            if ((expectedNamespace != namespaceIS) ||
                !expectedLocalname.equals(localnameIS)) {      
                Object exArgs[] = { namespaceIS + ":" + localnameIS, 
                                    expectedNamespace + ":" + expectedLocalname};
                throw new XMLSecurityException("xml.WrongElement", exArgs);
            }			
        }		
    }

    /** A checker for DOM that interns NS */
    public static class FullChecker extends ElementCheckerImpl {
        
        public void guaranteeThatElementInCorrectSpace(
            ElementProxy expected, Element actual
        ) throws XMLSecurityException {
            String expectedLocalname = expected.getBaseLocalName();
            String expectedNamespace = expected.getBaseNamespace();

            String localnameIS = actual.getLocalName();
            String namespaceIS = actual.getNamespaceURI();
            if ((!expectedNamespace.equals(namespaceIS)) ||
                !expectedLocalname.equals(localnameIS) ) {      
                Object exArgs[] = { namespaceIS + ":" + localnameIS, 
                                    expectedNamespace + ":" + expectedLocalname};
                throw new XMLSecurityException("xml.WrongElement", exArgs);
            }			
        }		
    }

    /** An empty checker if schema checking is used */
    public static class EmptyChecker extends ElementCheckerImpl {
        public void guaranteeThatElementInCorrectSpace(
            ElementProxy expected, Element actual
        ) throws XMLSecurityException {
            // empty
        }		
    }
}