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/*
 * Copyright 2005 Joe Walker
 *
 * 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.directwebremoting.util;

import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXParseException;

/**
 * An ErrorHandler that writes to the Logger class
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public final class LogErrorHandler implements ErrorHandler
{
    /* (non-Javadoc)
     * @see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)
     */
    public void fatalError(SAXParseException ex)
    {
        log.fatal(getMessage(ex));
    }

    /* (non-Javadoc)
     * @see org.xml.sax.ErrorHandler#error(org.xml.sax.SAXParseException)
     */
    public void error(SAXParseException ex)
    {
        log.error(getMessage(ex));
    }

    /* (non-Javadoc)
     * @see org.xml.sax.ErrorHandler#warning(org.xml.sax.SAXParseException)
     */
    public void warning(SAXParseException ex)
    {
        log.warn(getMessage(ex));
    }

    /**
     * @param ex The exception to create a message from
     * @return A summary of what went wrong.
     */
    private String getMessage(SAXParseException ex)
    {
        if (ex.getSystemId() != null)
        {
            return "SystemID=" + ex.getSystemId() + " Line=" + ex.getLineNumber() + ' ' + ex.getMessage();
        }

        if (ex.getPublicId() != null)
        {
            return "PublicID=" + ex.getPublicId() + " Line=" + ex.getLineNumber() + ' ' + ex.getMessage();
        }

        return "Line=" + ex.getLineNumber() + ' ' + ex.getMessage();
    }

    /**
     * The log stream
     */
    private static final Logger log = Logger.getLogger(LogErrorHandler.class);
}