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package com.esotericsoftware.kryo.io;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

/** An InputStream whose source is a {@link ByteBuffer}.
 * @author Nathan Sweet  */
public class ByteBufferInputStream extends InputStream {
	private ByteBuffer byteBuffer;

	public ByteBufferInputStream () {
	}

	/** Creates a stream with a new non-direct buffer of the specified size. The position and limit of the buffer is zero. */
	public ByteBufferInputStream (int bufferSize) {
		this(ByteBuffer.allocate(bufferSize));
		byteBuffer.flip();
	}

	/** Creates an uninitialized stream that cannot be used until {@link #setByteBuffer(ByteBuffer)} is called. */
	public ByteBufferInputStream (ByteBuffer byteBuffer) {
		this.byteBuffer = byteBuffer;
	}

	public ByteBuffer getByteBuffer () {
		return byteBuffer;
	}

	public void setByteBuffer (ByteBuffer byteBuffer) {
		this.byteBuffer = byteBuffer;
	}

	public int read () throws IOException {
		if (!byteBuffer.hasRemaining()) return -1;
		return byteBuffer.get();
	}

	public int read (byte[] bytes, int offset, int length) throws IOException {
		int count = Math.min(byteBuffer.remaining(), length);
		if (count == 0) return -1;
		byteBuffer.get(bytes, offset, count);
		return count;
	}

	public int available () throws IOException {
		return byteBuffer.remaining();
	}
}