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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.handler;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.util.Objects;
/**
* @author Simon Thoresen Hult
*/
abstract class AbstractContentOutputStream extends OutputStream {
public static final int BUFFERSIZE = 4096;
private ByteBuffer current;
@Override
public final void write(int b) {
if (current == null) {
current = ByteBuffer.allocate(BUFFERSIZE);
}
current.put((byte)b);
if (current.remaining() == 0) {
flush();
}
}
@Override
public final void write(byte[] buffer, int offset, int length) {
Objects.requireNonNull(buffer, "buf");
if (current == null) {
current = ByteBuffer.allocate(BUFFERSIZE + length);
}
int part = Math.min(length, current.remaining());
current.put(buffer, offset, part);
if (current.remaining() == 0) {
flush();
}
if (part < length) {
write(buffer, offset + part, length - part);
}
}
@Override
public final void write(byte[] buffer) {
write(buffer, 0, buffer.length);
}
@Override
public final void flush() {
if (current == null || current.position() == 0) {
return;
}
ByteBuffer buf = current;
current = null;
buf.flip();
doFlush(buf);
}
@Override
public final void close() {
flush();
doClose();
}
protected abstract void doFlush(ByteBuffer buf);
protected abstract void doClose();
}
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