LoggingFilterOutputStream.java

/*
 * 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.sshd.common.util;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.apache.commons.logging.Log;

/**
 * TODO Add javadoc
 *
 * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
 */
public class LoggingFilterOutputStream extends FilterOutputStream {

    private final String msg;
    private final Log log;

    public LoggingFilterOutputStream(OutputStream out, String msg, Log log) {
        super(out);
        this.msg = msg;
        this.log = log;
    }

    @Override
    public void write(int b) throws IOException {
	    byte[] d = new byte[1];
        d[0] = (byte) b;
        write(d, 0, 1);
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        if (log != null && log.isTraceEnabled()) {
            log.trace(msg+" "+BufferUtils.printHex(b, off, len));
        }
        out.write(b, off, len);
    }
}