/** | |
* 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.activemq.protobuf; | |
import java.io.OutputStream; | |
/** | |
* Very similar to the java.io.ByteArrayOutputStream but this version | |
* is not thread safe and the resulting data is returned in a ByteSequence | |
* to avoid an extra byte[] allocation. | |
*/ | |
public class ByteArrayOutputStream extends OutputStream { | |
byte buffer[]; | |
int size; | |
public ByteArrayOutputStream() { | |
this(1028); | |
} | |
public ByteArrayOutputStream(int capacity) { | |
buffer = new byte[capacity]; | |
} | |
public ByteArrayOutputStream(byte[] buffer) { | |
this.buffer = buffer; | |
} | |
public void write(int b) { | |
int newsize = size + 1; | |
checkCapacity(newsize); | |
buffer[size] = (byte) b; | |
size = newsize; | |
} | |
public void write(byte b[], int off, int len) { | |
int newsize = size + len; | |
checkCapacity(newsize); | |
System.arraycopy(b, off, buffer, size, len); | |
size = newsize; | |
} | |
/** | |
* Ensures the the buffer has at least the minimumCapacity specified. | |
* @param i | |
*/ | |
private void checkCapacity(int minimumCapacity) { | |
if (minimumCapacity > buffer.length) { | |
byte b[] = new byte[Math.max(buffer.length << 1, minimumCapacity)]; | |
System.arraycopy(buffer, 0, b, 0, size); | |
buffer = b; | |
} | |
} | |
public void reset() { | |
size = 0; | |
} | |
public ByteSequence toByteSequence() { | |
return new ByteSequence(buffer, 0, size); | |
} | |
public byte[] toByteArray() { | |
byte rc[] = new byte[size]; | |
System.arraycopy(buffer, 0, rc, 0, size); | |
return rc; | |
} | |
public int size() { | |
return size; | |
} | |
} |