org.apache.ode.utils.sax.LoggingErrorHandler.java Source code

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Here is the source code for org.apache.ode.utils.sax.LoggingErrorHandler.java

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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.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.ode.utils.sax;

import org.apache.ode.utils.msg.CommonMessages;
import org.apache.ode.utils.msg.MessageBundle;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

/**
 * An <code>ErrorHandler</code> implementation that dumps all of the error
 * messages onto a logging channel at the debug level.
 */
public class LoggingErrorHandler implements ErrorHandler {

    private static final Log __log = LogFactory.getLog(LoggingErrorHandler.class);
    private Log _l;

    private static final String WARNING = MessageBundle.getMessages(CommonMessages.class).strWarning()
            .toUpperCase();
    private static final String ERROR = MessageBundle.getMessages(CommonMessages.class).strError().toUpperCase();
    private static final String FATAL = MessageBundle.getMessages(CommonMessages.class).strFatal().toUpperCase();

    /**
     * Construct a new instance that dumps messages onto the default logging
     * channel defined by this class.
     */
    public LoggingErrorHandler() {
        _l = __log;
    }

    /**
     * Construct a new instance that dumps messages onto a specific logging
     * channel.
     *
     * @param log
     *          the <code>Log</code> on which to dump messages.
     */
    public LoggingErrorHandler(Log log) {
        _l = log;
    }

    /**
     * @see org.xml.sax.ErrorHandler#warning(org.xml.sax.SAXParseException)
     */
    public void warning(SAXParseException exception) throws SAXException {
        if (_l.isDebugEnabled()) {
            _l.debug(formatMessage(WARNING, exception));
        }
    }

    /**
     * @see org.xml.sax.ErrorHandler#error(org.xml.sax.SAXParseException)
     */
    public void error(SAXParseException exception) throws SAXException {
        if (_l.isDebugEnabled()) {
            _l.debug(formatMessage(ERROR, exception));
        }
    }

    /**
     * @see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)
     */
    public void fatalError(SAXParseException exception) throws SAXException {
        if (_l.isDebugEnabled()) {
            _l.debug(formatMessage(FATAL, exception));
        }
    }

    private String formatMessage(String level, SAXParseException spe) {
        StringBuffer sb = new StringBuffer(64);

        if (spe.getSystemId() != null) {
            sb.append(spe.getSystemId());
        }

        sb.append(':');
        sb.append(spe.getLineNumber());
        sb.append(':');
        sb.append(spe.getColumnNumber());
        sb.append(':');
        sb.append(level);
        sb.append(':');
        sb.append(spe.getMessage());

        return sb.toString();
    }

}