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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * Copyright 1997-2008 Sun Microsystems, Inc. All rights reserved.
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package com.sun.common.util.logging;

import java.util.logging.Logger;
import java.util.logging.Level;
import java.io.IOException;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;

/**
 * Implementation of a OutputStream that flush the records to a Logger.
 * This is useful to redirect stderr and stdout to loggers.
 *
 * User: Jerome Dochez
 */
public class LoggingOutputStream extends ByteArrayOutputStream {

    private String lineSeparator;

    private Logger logger;
    private Level level;

    /**
     * Constructor
     *
     * @param logger Logger to write to
     * @param level  Level at which to write the log message
     */
    public LoggingOutputStream(Logger logger, Level level) {
        super();
        this.logger = logger;
        this.level = level;
        lineSeparator = System.getProperty("line.separator");
    }

    /**
     * upon flush() write the existing contents of the OutputStream
     * to the logger as a log record.
     *
     * @throws java.io.IOException in case of error
     */
    public void flush() throws IOException {

        String record=null;
        synchronized (this) {
            super.flush();
            record = this.toString();
            super.reset();
        }
        if (record!=null) {
            if (record.length() == 0 || record.equals(lineSeparator)) {
                // avoid empty records
                return;
            }            
            logger.logp(level, "", "", record);
        }
    }
}