sketcher2/src/com/jotuntech/sketcher/client/command/LayerDataCommand.java

package com.jotuntech.sketcher.client.command;

import java.nio.ByteBuffer;

import com.jotuntech.sketcher.client.Client;
import com.jotuntech.sketcher.client.Command;
import com.jotuntech.sketcher.client.Connection;
import com.jotuntech.sketcher.common.Canvas;
import com.jotuntech.sketcher.common.Layer;
import com.jotuntech.sketcher.common.User;

public class LayerDataCommand implements Command {
	int layerKey;
	boolean phantom;
	byte[] data;

	public LayerDataCommand() {
	}

	public LayerDataCommand(int layerKey, boolean phantom, byte[] data) {
		this.layerKey = layerKey;
		this.phantom = phantom;
		this.data = data;
	}

	public int perform(Client client, User user) {
		Canvas canvas = client.getCanvas();

		if(canvas == null) {
			return Connection.SEND_NONE;
		}

		Layer layer;

		if(phantom) {
			if(user == null) {
				return Connection.SEND_NONE;
			}

			layer = user.getPhantomLayer();
		} else {
			layer = canvas.getLayerMap().get(layerKey);

			if(layer == null) {
				return Connection.SEND_NONE;
			}
		}

		layer.decode(data);

		return Connection.SEND_NONE;
	}

	public void decode(ByteBuffer in) {
		layerKey = in.getInt();
		phantom = in.get() != 0;
		data = new byte[in.remaining()];
		in.get(data);
	}

	public void encode(ByteBuffer out) {
		out.putInt(layerKey);
		out.put((byte) (phantom ? 0xFF : 0x00));
		out.put(data);
	}
}