webit.script.util.FastByteArrayOutputStream Maven / Gradle / Ivy
package webit.script.util;
// Copyright (c) 2003-2013, Jodd Team (jodd.org). All Rights Reserved.
//package jodd.io;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
/**
* This class implements an output stream in which the data is written into a
* byte array. The buffer automatically grows as data is written to it.
*
* The data can be retrieved using
* toByteArray() and
* toString().
*
* Closing a
* FastByteArrayOutputStream has no effect. The methods in this
* class can be called after the stream has been closed without generating an
* IOException.
*
* This is an alternative implementation of the
* java.io.FastByteArrayOutputStream class. The original implementation only
* allocates 32 bytes at the beginning. As this class is designed for heavy duty
* it starts at 1024 bytes. In contrast to the original it doesn't reallocate
* the whole memory block but allocates additional buffers. This way no buffers
* need to be garbage collected and the contents don't have to be copied to the
* new buffer. This class is designed to behave exactly like the original. The
* only exception is the depreciated toString(int) method that has been ignored.
*
*/
public class FastByteArrayOutputStream extends OutputStream {
private final FastByteBuffer buffer;
/**
* Creates a new byte array output stream. The buffer capacity is initially
* 1024 bytes, though its size increases if necessary.
*/
public FastByteArrayOutputStream() {
this(1024);
}
/**
* Creates a new byte array output stream, with a buffer capacity of the
* specified size, in bytes.
*
* @param size the initial size.
* @throws IllegalArgumentException if size is negative.
*/
public FastByteArrayOutputStream(int size) {
buffer = new FastByteBuffer(size);
}
/**
* @see java.io.OutputStream#write(byte[], int, int)
*/
@Override
public void write(byte[] b, int off, int len) {
buffer.append(b, off, len);
}
/**
* Writes single byte.
*/
@Override
public void write(int b) {
buffer.append((byte) b);
}
/**
* @see java.io.ByteArrayOutputStream#size()
*/
public int size() {
return buffer.size();
}
/**
* Closing a
* FastByteArrayOutputStream has no effect. The methods in this
* class can be called after the stream has been closed without generating
* an
* IOException.
*/
@Override
public void close() {
//nop
}
/**
* @see java.io.ByteArrayOutputStream#reset()
*/
public void reset() {
buffer.clear();
}
/**
* @see java.io.ByteArrayOutputStream#writeTo(OutputStream)
*/
public void writeTo(OutputStream out) throws IOException {
int index = buffer.index();
for (int i = 0; i < index; i++) {
byte[] buf = buffer.array(i);
out.write(buf);
}
out.write(buffer.array(index), 0, buffer.offset());
}
/**
* @see java.io.ByteArrayOutputStream#toByteArray()
*/
public byte[] toByteArray() {
return buffer.toArray();
}
/**
* @see java.io.ByteArrayOutputStream#toString()
*/
@Override
public String toString() {
return new String(toByteArray());
}
/**
* @see java.io.ByteArrayOutputStream#toString(String)
*/
public String toString(String enc) throws UnsupportedEncodingException {
return new String(toByteArray(), enc);
}
}