ChecksummedOutputStream.java

package org.apache.cassandra.io.util;
/*
 * 
 * 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.
 * 
 */


import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.Checksum;

public class ChecksummedOutputStream extends OutputStream
{
    private final OutputStream out;
    private final Checksum checksum;

    public ChecksummedOutputStream(OutputStream out, Checksum checksum)
    {
        this.out = out;
        this.checksum = checksum;
    }

    public void resetChecksum()
    {
        checksum.reset();
    }

    public void write(int b) throws IOException
    {
        out.write(b);
        checksum.update(b);
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException
    {
        out.write(b, off, len);
        checksum.update(b, off, len);
    }
}