content: /*
   * 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 mf.org.apache.xerces.util;
  
  import org.xml.sax.ErrorHandler;
  import org.xml.sax.SAXException;
  import org.xml.sax.SAXParseException;
  
  import mf.org.apache.xerces.xni.parser.XMLErrorHandler;
  
  /**
   * Wraps {@link XMLErrorHandler} and make it look like a SAX {@link ErrorHandler}.
   * <p/>
   * <p/>
   * The derived class should override the {@link #getErrorHandler()} method
   * so that it will return the correct {@link XMLErrorHandler} instance.
   * This method will be called whenever an error/warning is found.
   * <p/>
   * <p/>
   * Experience shows that it is better to store the actual
   * {@link XMLErrorHandler} in one place and looks up that variable,
   * rather than copying it into every component that needs an error handler
   * and update all of them whenever it is changed, IMO.
   *
   * @author Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
   * @version $Id: ErrorHandlerProxy.java 447241 2006-09-18 05:12:57Z mrglavas $
   */
  public abstract class ErrorHandlerProxy implements ErrorHandler {
  
      @Override
      public void error(SAXParseException e) throws SAXException {
          XMLErrorHandler eh = getErrorHandler();
          if (eh instanceof ErrorHandlerWrapper) {
              ((ErrorHandlerWrapper) eh).fErrorHandler.error(e);
          } else {
              eh.error("", "", ErrorHandlerWrapper.createXMLParseException(e));
          }
          // if an XNIException is thrown, just let it go.
          // REVISIT: is this OK? or should we try to wrap it into SAXException?
      }
  
      @Override
      public void fatalError(SAXParseException e) throws SAXException {
          XMLErrorHandler eh = getErrorHandler();
          if (eh instanceof ErrorHandlerWrapper) {
              ((ErrorHandlerWrapper) eh).fErrorHandler.fatalError(e);
          } else {
              eh.fatalError("", "", ErrorHandlerWrapper.createXMLParseException(e));
          }
      }
  
      @Override
      public void warning(SAXParseException e) throws SAXException {
          XMLErrorHandler eh = getErrorHandler();
          if (eh instanceof ErrorHandlerWrapper) {
              ((ErrorHandlerWrapper) eh).fErrorHandler.warning(e);
          } else {
              eh.warning("", "", ErrorHandlerWrapper.createXMLParseException(e));
          }
      }
  
      protected abstract XMLErrorHandler getErrorHandler();
  }
  