/**
 * Copyright 2005-2012 Akiban Technologies, Inc.
 * 
 * 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 com.persistit.logging;

import java.util.EnumMap;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Wraps a JDK 1.4 <code>java.util.logging.Logger</code> for Persistit logging.
 * Code to enable default logging through the JDK 1.4 Logging API is shown here:
 * <code><pre>
 *    // refer to any appropriate java.util.logging.Logger, for example
 *    Logger logger = java.util.logging.Logger.getLogger("com.persistit");    //(for example)
 *    Persistit.setPersistitLogger(new JDK14LoggingAdapter(logger));
 * </pre></code>
 * 
 * @version 1.1
 */
public class JDK14LoggingAdapter implements PersistitLogger {

    private final static EnumMap<PersistitLevel, Level> LEVEL_MAP = new EnumMap<PersistitLevel, Level>(
            PersistitLevel.class);

    static {
        LEVEL_MAP.put(PersistitLevel.NONE, Level.OFF);
        LEVEL_MAP.put(PersistitLevel.TRACE, Level.FINER);
        LEVEL_MAP.put(PersistitLevel.DEBUG, Level.FINE);
        LEVEL_MAP.put(PersistitLevel.INFO, Level.INFO);
        LEVEL_MAP.put(PersistitLevel.WARNING, Level.WARNING);
        LEVEL_MAP.put(PersistitLevel.ERROR, Level.SEVERE);
    }

    private final Logger _logger;

    /**
     * Constructs a wrapped JDK 1.4 Logger.
     * 
     * @param logger
     *            A <code>Logger</code> to which Persistit log messages will be
     *            directed.
     */
    public JDK14LoggingAdapter(final Logger logger) {
        _logger = logger;
    }

    /**
     * Overrides <code>isLoggable</code> to allow control by the wrapped
     * <code>Logger</code>.
     * 
     * @param level
     *            The <code>PersistitLevel</code>
     */
    @Override
    public boolean isLoggable(final PersistitLevel level) {
        return _logger.isLoggable(LEVEL_MAP.get(level));
    }

    /**
     * Writes a log message generated by Persistit to the wrapped
     * <code>Logger</code>.
     * 
     * @param level
     *            The <code>PersistitLevel</code>
     * @param message
     *            The message to write to the log.
     */
    @Override
    public void log(final PersistitLevel level, final String message) {
        _logger.log(LEVEL_MAP.get(level), message);
    }

    @Override
    public void open() {
        // Nothing to do - the log is created and destroyed by the embedding
        // application
    }

    @Override
    public void close() {
        // Nothing to do - the log is created and destroyed by the embedding
        // application
    }

    @Override
    public void flush() {
        // Nothing to do - log output is managed by the embedding
        // application
    }
}