/*
* 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.cassandra.io.util;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.apache.cassandra.utils.ByteBufferUtil;
/**
* An implementation of the DataOutputStream interface using a FastByteArrayOutputStream and exposing
* its buffer so copies can be avoided.
*
* This class is completely thread unsafe.
*/
public final class DataOutputByteBuffer extends AbstractDataOutput
{
final ByteBuffer buffer;
public DataOutputByteBuffer(ByteBuffer buffer)
{
this.buffer = buffer;
}
@Override
public void write(int b)
{
buffer.put((byte) b);
}
@Override
public void write(byte[] b, int off, int len)
{
buffer.put(b, off, len);
}
public void write(ByteBuffer buffer) throws IOException
{
int len = buffer.remaining();
ByteBufferUtil.arrayCopy(buffer, buffer.position(), this.buffer, this.buffer.position(), len);
this.buffer.position(this.buffer.position() + len);
}
}