gt:         if (CURRENT_ELEMENT_NODE.equals(name)) {
context: /*
   * 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.xerces.jaxp.validation;
  
  import java.io.IOException;
  import java.util.Locale;
  
  import javax.xml.transform.Result;
  import javax.xml.transform.Source;
  import javax.xml.transform.dom.DOMSource;
  import javax.xml.transform.sax.SAXSource;
  import javax.xml.transform.stream.StreamSource;
  import javax.xml.validation.Validator;
  
  import org.apache.xerces.impl.Constants;
  import org.apache.xerces.util.SAXMessageFormatter;
  import org.apache.xerces.xni.parser.XMLConfigurationException;
  import org.apache.xerces.xs.AttributePSVI;
  import org.apache.xerces.xs.ElementPSVI;
  import org.apache.xerces.xs.PSVIProvider;
  import org.w3c.dom.ls.LSResourceResolver;
  import org.xml.sax.ErrorHandler;
  import org.xml.sax.SAXException;
  import org.xml.sax.SAXNotRecognizedException;
  import org.xml.sax.SAXNotSupportedException;
  
  /**
   * <p>Implementation of Validator for W3C XML Schemas.</p>
   *
   * @author <a href="mailto:Kohsuke.Kawaguchi@Sun.com">Kohsuke Kawaguchi</a>
   * @author Michael Glavassevich, IBM
   * 
   * @version $Id$
   */
  final class ValidatorImpl extends Validator implements PSVIProvider {
      
      // property identifiers
      
      /** Property identifier: Current element node. */
      private static final String CURRENT_ELEMENT_NODE =
          Constants.XERCES_PROPERTY_PREFIX + Constants.CURRENT_ELEMENT_NODE_PROPERTY;
      
      //
      // Data
      //
      
      /** Component manager. **/
      private XMLSchemaValidatorComponentManager fComponentManager;
      
      /** SAX validator helper. **/
      private ValidatorHandlerImpl fSAXValidatorHelper;
      
      /** DOM validator helper. **/
      private DOMValidatorHelper fDOMValidatorHelper;
      
      /** Stream validator helper. **/
      private StreamValidatorHelper fStreamValidatorHelper;
      
      /** Flag for tracking whether features/properties changed since last reset. */
      private boolean fConfigurationChanged = false;
      
      /** Flag for tracking whether the error handler changed since last reset. */
      private boolean fErrorHandlerChanged = false;
      
      /** Flag for tracking whether the resource resolver changed since last reset. */
      private boolean fResourceResolverChanged = false;
      
      public ValidatorImpl(XSGrammarPoolContainer grammarContainer) {
          fComponentManager = new XMLSchemaValidatorComponentManager(grammarContainer);
          setErrorHandler(null);
          setResourceResolver(null);
      }
  
      public void validate(Source source, Result result)
          throws SAXException, IOException {
          if (source instanceof SAXSource) {
              // Hand off to SAX validator helper.
              if (fSAXValidatorHelper == null) {
                  fSAXValidatorHelper = new ValidatorHandlerImpl(fComponentManager);
              }
              fSAXValidatorHelper.validate(source, result);
          }
          else if (source instanceof DOMSource) {
              // Hand off to DOM validator helper.
              if (fDOMValidatorHelper == null) {
                  fDOMValidatorHelper = new DOMValidatorHelper(fComponentManager);
              }
              fDOMValidatorHelper.validate(source, result);
          }
          else if (source instanceof StreamSource) {
              // Hand off to stream validator helper.
              if (fStreamValidatorHelper == null) {
                  fStreamValidatorHelper = new StreamValidatorHelper(fComponentManager);
              }
              fStreamValidatorHelper.validate(source, result);
          }
          // Source parameter cannot be null.
          else if (source == null) {
              throw new NullPointerException(JAXPValidationMessageFormatter.formatMessage(Locale.getDefault(), 
                      "SourceParameterNull", null));
          }
          // Source parameter must be a SAXSource, DOMSource or StreamSource
          else {
              throw new IllegalArgumentException(JAXPValidationMessageFormatter.formatMessage(Locale.getDefault(), 
                      "SourceNotAccepted", new Object [] {source.getClass().getName()}));
          }
      }
  
      public void setErrorHandler(ErrorHandler errorHandler) {
          fErrorHandlerChanged = (errorHandler != null);
          fComponentManager.setErrorHandler(errorHandler);
      }
  
      public ErrorHandler getErrorHandler() {
          return fComponentManager.getErrorHandler();
      }
  
      public void setResourceResolver(LSResourceResolver resourceResolver) {
          fResourceResolverChanged = (resourceResolver != null);
          fComponentManager.setResourceResolver(resourceResolver);
      }
  
      public LSResourceResolver getResourceResolver() {
          return fComponentManager.getResourceResolver();
      }
      
      public boolean getFeature(String name) 
          throws SAXNotRecognizedException, SAXNotSupportedException {
          if (name == null) {
              throw new NullPointerException();
          }
          try {
              return fComponentManager.getFeature(name);
          }
          catch (XMLConfigurationException e) {
              final String identifier = e.getIdentifier();
              final String key = e.getType() == XMLConfigurationException.NOT_RECOGNIZED ?
                      "feature-not-recognized" : "feature-not-supported";
              throw new SAXNotRecognizedException(
                      SAXMessageFormatter.formatMessage(Locale.getDefault(), 
                      key, new Object [] {identifier}));
          }
      }
      
      public void setFeature(String name, boolean value)
          throws SAXNotRecognizedException, SAXNotSupportedException {
          if (name == null) {
              throw new NullPointerException();
          }
          try {
              fComponentManager.setFeature(name, value);
          }
          catch (XMLConfigurationException e) {
              final String identifier = e.getIdentifier();
              final String key = e.getType() == XMLConfigurationException.NOT_RECOGNIZED ?
                      "feature-not-recognized" : "feature-not-supported";
              throw new SAXNotRecognizedException(
                      SAXMessageFormatter.formatMessage(Locale.getDefault(), 
                      key, new Object [] {identifier}));
          }
          fConfigurationChanged = true;
      }
      
      public Object getProperty(String name)
          throws SAXNotRecognizedException, SAXNotSupportedException {
          if (name == null) {
              throw new NullPointerException();
          }
          if (CURRENT_ELEMENT_NODE.equals(name)) {
              return (fDOMValidatorHelper != null) ? 
                      fDOMValidatorHelper.getCurrentElement() : null;
          }
          try {
              return fComponentManager.getProperty(name);
          }
          catch (XMLConfigurationException e) {
              final String identifier = e.getIdentifier();
              final String key = e.getType() == XMLConfigurationException.NOT_RECOGNIZED ?
                      "property-not-recognized" : "property-not-supported";
              throw new SAXNotRecognizedException(
                      SAXMessageFormatter.formatMessage(Locale.getDefault(), 
                      key, new Object [] {identifier}));
          }
      }
      
      public void setProperty(String name, Object object)
          throws SAXNotRecognizedException, SAXNotSupportedException {
          if (name == null) {
              throw new NullPointerException();
          }
  