src/org/apache/xml/security/utils/ElementCheckerImpl.java

/*
 * Copyright  2009 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.
 *
 */
package org.apache.xml.security.utils;

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

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 localnameSHOULDBE = expected.getBaseLocalName();
		      String namespaceSHOULDBE = expected.getBaseNamespace();
		      
		      String localnameIS = actual.getLocalName();
		      String namespaceIS = actual.getNamespaceURI();
		      if ((namespaceSHOULDBE!=namespaceIS) ||
		       !localnameSHOULDBE.equals(localnameIS) ) {      
		         Object exArgs[] = { namespaceIS +":"+ localnameIS, 
		           namespaceSHOULDBE +":"+ localnameSHOULDBE};
		         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 localnameSHOULDBE = expected.getBaseLocalName();
		      String namespaceSHOULDBE = expected.getBaseNamespace();
		      
		      String localnameIS = actual.getLocalName();
		      String namespaceIS = actual.getNamespaceURI();
		      if ((!namespaceSHOULDBE.equals(namespaceIS)) ||
		       !localnameSHOULDBE.equals(localnameIS) ) {      
		         Object exArgs[] = { namespaceIS +":"+ localnameIS, 
		           namespaceSHOULDBE +":"+ localnameSHOULDBE};
		         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 {
		}		
	}
}