org.fusesource.hawtbuf.ByteArrayOutputStream Maven / Gradle / Ivy
/**
* 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.fusesource.hawtbuf;
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 Buffer
* to avoid an extra byte[] allocation.
*
* @author Hiram Chirino
*/
public class ByteArrayOutputStream extends OutputStream {
byte buffer[];
int size;
public ByteArrayOutputStream() {
this(1028);
}
public ByteArrayOutputStream(int capacity) {
buffer = new byte[capacity];
}
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;
}
public void write(Buffer b) {
write(b.data, b.offset, b.length);
}
/**
* Ensures the the buffer has at least the minimumCapacity specified.
* @param minimumCapacity
*/
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 Buffer toBuffer() {
return new Buffer(buffer, 0, size);
}
public byte[] toByteArray() {
return toBuffer().toByteArray();
}
public int size() {
return size;
}
}