/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.tools.ant.taskdefs.optional;

import org.apache.tools.ant.Project;

import java.io.IOException;
import java.io.OutputStream;
import java.io.ByteArrayOutputStream;


/**
 * Logs each line written to this stream to the log system of ant.
 *
 * Tries to be smart about line separators.<br>
 * TODO: This class can be split to implement other line based processing
 * of data written to the stream.
 *
 * @author thomas.haas@softwired-inc.com
 */
public class LogOutputStream extends OutputStream {

    private ByteArrayOutputStream buffer = new ByteArrayOutputStream();
    private boolean skip = false;

    private Project project;
    private String tag = null;
    private int level = Project.MSG_INFO;

    /**
     * Creates a new instance of this class.
     *
     * @param project the project to log to.
     * @param tag text to label data written to this stream.
     * @param level loglevel used to log data written to this stream.
     */
    public LogOutputStream(Project project, String tag, int level) {
        this.project = project;
        this.tag = tag;
        this.level = level;
    }


    /**
     * Write the data to the buffer and flush the buffer, if a line
     * separator is detected.
     *
     * @cc data to log (byte).
     */
    public void write(int cc) throws IOException {
        final byte c = (byte)cc;
        if ((c == '\n') || (c == '\r')) {
            if (!skip) processBuffer();
        } else buffer.write(cc);
        skip = (c == '\r');
    }


    /**
     * Converts the buffer to a string and sends it to <code>processLine</code>
     */
    protected void processBuffer() {
        processLine(buffer.toString());
        buffer.reset();
    }

    /**
     * Logs a line to the log system of ant.
     *
     * @param line the line to log.
     */
    protected void processLine(String line) {
        if (tag == null) project.log(line, level);
        else project.log(line, tag, level);
    }


    /**
     * Writes all remaining
     */
    public void close() throws IOException {
        if (buffer.size() > 0) processBuffer();
        super.close();
    }
}