/*
 *  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.axis2.util;

import java.io.Writer;

import org.apache.commons.logging.Log;

/**
 * {@link Writer} implementation that redirects to a logger.
 */
public class LogWriter extends Writer {
    private final Log log;
    private final String endOfLine;
    private final StringBuffer lineBuffer = new StringBuffer();
    private int endOfLineMatch;
    
    public LogWriter(Log log, String endOfLine) {
        this.log = log;
        this.endOfLine = endOfLine;
    }

    public LogWriter(Log log) {
        this(log, System.getProperty("line.separator"));
    }
    
    @Override
    public void write(char[] cbuf, int off, int len) {
        int start = off;
        for (int i=off; i<off+len; i++) {
            if (cbuf[i] == endOfLine.charAt(endOfLineMatch)) {
                endOfLineMatch++;
                if (endOfLineMatch == endOfLine.length()) {
                    lineBuffer.append(cbuf, start, i-start+1);
                    lineBuffer.setLength(lineBuffer.length()-endOfLine.length());
                    flushLineBuffer();
                    start = i+1;
                    endOfLineMatch = 0;
                }
            } else {
                endOfLineMatch = 0;
            }
        }
        lineBuffer.append(cbuf, start, off+len-start);
    }

    @Override
    public void close() {
        if (lineBuffer.length() > 0) {
            flushLineBuffer();
        }
    }
    
    @Override
    public void flush() {
        // Nothing to do
    }

    private void flushLineBuffer() {
        log.info(lineBuffer.toString());
        lineBuffer.setLength(0);
    }
}