Ptidej-v5.2-master/PADL Serialiser DB4O Tests/rsc/JHotDraw v5.1/src/CH/ifa/draw/standard/AbstractConnector.java
/*
 * @(#)AbstractConnector.java 5.1
 *
 */

package CH.ifa.draw.standard;

import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.io.IOException;

import CH.ifa.draw.framework.ConnectionFigure;
import CH.ifa.draw.framework.Connector;
import CH.ifa.draw.framework.Figure;
import CH.ifa.draw.util.Geom;
import CH.ifa.draw.util.StorableInput;
import CH.ifa.draw.util.StorableOutput;

/**
 * AbstractConnector provides default implementation for
 * the Connector interface.
 * @see Connector
 */
public abstract class AbstractConnector implements Connector {
	/**
	 * the owner of the connector
	 */
	private Figure      fOwner;

	/*
	 * Serialization support.
	 */
	private static final long serialVersionUID = -5170007865562687545L;
	private int abstractConnectorSerializedDataVersion = 1;

	/**
	 * Constructs a connector that has no owner. It is only
	 * used internally to resurrect a connectors from a
	 * StorableOutput. It should never be called directly.
	 */
	public AbstractConnector() {
		fOwner = null;
	}

	/**
	 * Constructs a connector with the given owner figure.
	 */
	public AbstractConnector(Figure owner) {
		fOwner = owner;
	}

	/**
	 * Gets the connector's owner.
	 */
	public Figure owner() {
		return fOwner;
	}

	public Point findStart(ConnectionFigure connection) {
		return findPoint(connection);
	}

	public Point findEnd(ConnectionFigure connection) {
		return findPoint(connection);
	}

	/**
	 * Gets the connection point. Override when the connector
	 * does not need to distinguish between the start and end
	 * point of a connection.
	 */
	protected Point findPoint(ConnectionFigure connection) {
		return Geom.center(displayBox());
	}

	/**
	 * Gets the display box of the connector.
	 */
	public Rectangle displayBox() {
		return owner().displayBox();
	}

	/**
	 * Tests if a point is contained in the connector.
	 */
	public boolean containsPoint(int x, int y) {
		return owner().containsPoint(x, y);
	}

	/**
	 * Draws this connector. By default connectors are invisible.
	 */
	public void draw(Graphics g) {
		// invisible by default
	}

	/**
	 * Stores the connector and its owner to a StorableOutput.
	 */
	public void write(StorableOutput dw) {
		dw.writeStorable(fOwner);
	}

	/**
	 * Reads the connector and its owner from a StorableInput.
	 */
	public void read(StorableInput dr) throws IOException {
		fOwner = (Figure)dr.readStorable();
	}

}

