package org.apache.avro.util;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
public class ByteBufferOutputStream extends OutputStream {
public static final int BUFFER_SIZE = 8192;
private List<ByteBuffer> buffers;
public ByteBufferOutputStream() {
reset();
}
public List<ByteBuffer> getBufferList() {
List<ByteBuffer> result = buffers;
reset();
for (ByteBuffer buffer : result)
buffer.flip();
return result;
}
public void prepend(List<ByteBuffer> lists) {
for (ByteBuffer buffer : lists) {
buffer.position(buffer.limit());
}
buffers.addAll(0, lists);
}
public void append(List<ByteBuffer> lists) {
for (ByteBuffer buffer : lists) {
buffer.position(buffer.limit());
}
buffers.addAll(lists);
}
public void reset() {
buffers = new ArrayList<>();
buffers.add(ByteBuffer.allocate(BUFFER_SIZE));
}
public void write(ByteBuffer buffer) {
buffers.add(buffer);
}
@Override
public void write(int b) {
ByteBuffer buffer = buffers.get(buffers.size() - 1);
if (buffer.remaining() < 1) {
buffer = ByteBuffer.allocate(BUFFER_SIZE);
buffers.add(buffer);
}
buffer.put((byte) b);
}
@Override
public void write(byte[] b, int off, int len) {
ByteBuffer buffer = buffers.get(buffers.size() - 1);
int remaining = buffer.remaining();
while (len > remaining) {
buffer.put(b, off, remaining);
len -= remaining;
off += remaining;
buffer = ByteBuffer.allocate(BUFFER_SIZE);
buffers.add(buffer);
remaining = buffer.remaining();
}
buffer.put(b, off, len);
}
public void writeBuffer(ByteBuffer buffer) throws IOException {
if (buffer.remaining() < BUFFER_SIZE) {
write(buffer.array(), buffer.position(), buffer.remaining());
} else {
ByteBuffer dup = buffer.duplicate();
dup.position(buffer.limit());
buffers.add(dup);
}
}
}