/*
* @(#)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();
}
}