/*
* 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.kafka.common.utils;
import java.io.OutputStream;
import java.nio.ByteBuffer;
/**
* A byte buffer backed output outputStream
*/
public class ByteBufferOutputStream extends OutputStream {
private static final float REALLOCATION_FACTOR = 1.1f;
private ByteBuffer buffer;
public ByteBufferOutputStream(ByteBuffer buffer) {
this.buffer = buffer;
}
public void write(int b) {
if (buffer.remaining() < 1)
expandBuffer(buffer.capacity() + 1);
buffer.put((byte) b);
}
public void write(byte[] bytes, int off, int len) {
if (buffer.remaining() < len)
expandBuffer(buffer.capacity() + len);
buffer.put(bytes, off, len);
}
public ByteBuffer buffer() {
return buffer;
}
private void expandBuffer(int size) {
int expandSize = Math.max((int) (buffer.capacity() * REALLOCATION_FACTOR), size);
ByteBuffer temp = ByteBuffer.allocate(expandSize);
temp.put(buffer.array(), buffer.arrayOffset(), buffer.position());
buffer = temp;
}
}