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 * reserved comment block

 * DO NOT REMOVE OR ALTER!

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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.

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package com.sun.org.apache.xerces.internal.util;

import com.sun.org.apache.xerces.internal.xni.parser.XMLErrorHandler;

import org.xml.sax.ErrorHandler;

import org.xml.sax.SAXException;

import org.xml.sax.SAXParseException;

/**

 * Wraps {@link XMLErrorHandler} and make it look like a SAX {@link ErrorHandler}.

 *

 * <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>

 * 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

 *

 */

public abstract class ErrorHandlerProxy implements ErrorHandler {

    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?

    }

    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));

        }

    }

    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();

}