146 lines
2.9 KiB
Java
146 lines
2.9 KiB
Java
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package net.sourceforge.tuned;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.ByteBuffer;
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import java.nio.channels.Channels;
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import java.nio.channels.ReadableByteChannel;
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public class ByteBufferOutputStream extends OutputStream {
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private ByteBuffer buffer;
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private final float loadFactor;
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public ByteBufferOutputStream(int initialCapacity) {
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this(initialCapacity, 1.0f);
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}
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public ByteBufferOutputStream(int initialCapacity, float loadFactor) {
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if (initialCapacity < 0)
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throw new IllegalArgumentException("initialCapacity must not be negative");
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if (loadFactor <= 0 || Float.isNaN(loadFactor))
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throw new IllegalArgumentException("loadFactor must be greater than 0");
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this.buffer = ByteBuffer.allocate(initialCapacity);
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this.loadFactor = loadFactor;
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}
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@Override
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public void write(int b) throws IOException {
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ensureCapacity(buffer.position() + 1);
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buffer.put((byte) b);
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}
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@Override
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public void write(byte[] src) throws IOException {
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ensureCapacity(buffer.position() + src.length);
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buffer.put(src);
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}
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public void write(ByteBuffer src) throws IOException {
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ensureCapacity(buffer.position() + src.remaining());
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buffer.put(src);
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}
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@Override
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public void write(byte[] src, int offset, int length) throws IOException {
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ensureCapacity(buffer.position() + length);
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buffer.put(src, offset, length);
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}
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public void ensureCapacity(int minCapacity) {
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if (minCapacity <= buffer.capacity())
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return;
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// calculate new buffer size with load factor
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int newCapacity = (int) (buffer.capacity() * (1 + loadFactor));
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// ensure minCapacity
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if (newCapacity < minCapacity)
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newCapacity = minCapacity;
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// create new buffer with increased capacity
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ByteBuffer newBuffer = ByteBuffer.allocate(newCapacity);
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// copy current data to new buffer
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buffer.flip();
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newBuffer.put(buffer);
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buffer = newBuffer;
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}
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public ByteBuffer getByteBuffer() {
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ByteBuffer result = buffer.duplicate();
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// flip buffer so it can be read
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result.flip();
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return result;
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}
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public byte[] getByteArray() {
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ByteBuffer data = getByteBuffer();
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// copy data to byte array
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byte[] bytes = new byte[data.remaining()];
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data.get(bytes);
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return bytes;
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}
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public int transferFrom(ReadableByteChannel channel) throws IOException {
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// make sure buffer is not at its limit
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ensureCapacity(buffer.position() + 1);
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return channel.read(buffer);
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}
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public int transferFully(InputStream inputStream) throws IOException {
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return transferFully(Channels.newChannel(inputStream));
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}
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public int transferFully(ReadableByteChannel channel) throws IOException {
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int total = 0, read = 0;
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while ((read = transferFrom(channel)) >= 0) {
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total += read;
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}
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return total;
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}
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public int position() {
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return buffer.position();
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}
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public int capacity() {
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return buffer.capacity();
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}
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public void rewind() {
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buffer.rewind();
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}
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}
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