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/*
* @(#)ConnectionSet.java 1.0 03-JUL-04
*
* Copyright (c) 2001-2004 Gaudenz Alder
*
*/
package org.jgraph.graph;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* An object that represents a set of connections. Connections are equal, if
* equals returns true. Connections that are added later replace earlier
* connections.
*
* @version 1.0 1/1/02
* @author Gaudenz Alder
*/
public class ConnectionSet implements Serializable {
/** Contents of the connection set. */
protected Set connections = new HashSet();
/** Set of changed edges for the connection set. */
protected Set edges = new HashSet();
/**
* Returns a connection set that represents the connection or disconnection
* of cells in model based on
* disconnect.
*/
public static ConnectionSet create(GraphModel m, Object[] cells,
boolean disconnect) {
ConnectionSet cs = new ConnectionSet();
for (int i = 0; i < cells.length; i++) {
Object cell = cells[i];
// Edge
if (m.isEdge(cell)) {
if (disconnect)
cs.disconnect(cell);
else
cs.connect(cell, m.getSource(cell), m.getTarget(cell));
}
// Port
Iterator it = m.edges(cell);
while (it.hasNext()) {
// Edge At Port
Object edge = it.next();
if (m.getSource(edge) == cell)
connect(cs, edge, cell, true, disconnect);
else if (m.getTarget(edge) == cell)
connect(cs, edge, cell, false, disconnect);
}
}
return cs;
}
/**
* Constructs an empty ConnectionSet.
*/
public ConnectionSet() {
}
/**
* Constructs a ConnectionSet with one Connection.
*/
public ConnectionSet(Object edge, Object port, boolean source) {
connect(edge, port, source);
}
/**
* Constructs a connection set containing the specified connections and
* updates the set of changed edges.
*/
public ConnectionSet(Set connections) {
setConnections(connections);
Iterator it = connections.iterator();
while (it.hasNext()) {
Connection conn = (Connection) it.next();
edges.add(conn.getEdge());
}
}
/**
* Constructs a ConnectionSet with two Connections (to the source and target
* port of the edge).
*/
public ConnectionSet(Object edge, Object source, Object target) {
connect(edge, source, target);
}
/**
* Connect or disconnect edge from source and
* target in cs based on
* disconnect.
*/
protected static void connect(ConnectionSet cs, Object edge, Object port,
boolean source, boolean disconnect) {
if (disconnect)
cs.disconnect(edge, source);
else
cs.connect(edge, port, source);
}
/**
* Adds the connections in views to the connection set.
*/
public void addConnections(CellView[] views) {
for (int i = 0; i < views.length; i++) {
if (views[i] instanceof EdgeView) {
EdgeView edgeView = (EdgeView) views[i];
Object edge = edgeView.getCell();
CellView sourceView = edgeView.getSource();
CellView targetView = edgeView.getTarget();
Object source = null;
if (sourceView != null)
source = sourceView.getCell();
Object target = null;
if (targetView != null)
target = targetView.getCell();
connect(edge, source, target);
}
}
}
/**
* Connect edge to source and
* target in the connection set. The previous connections
* between edge and its source and target are replaced in the
* set.
*/
public void connect(Object edge, Object source, Object target) {
connect(edge, source, true);
connect(edge, target, false);
}
/**
* Connect edge to port passed in. The
* source indicates if port is the source of
* edge object. The previous connections between
* edge and its source or target in the set is replaced.
*/
public void connect(Object edge, Object port, boolean source) {
Connection c = new Connection(edge, port, source);
connections.remove(c);
connections.add(c);
edges.add(edge);
}
/**
* Disconnect edge from source and
* target in the connection set. The previous connections
* between edge and its source and target are replaced in the
* set.
*/
public void disconnect(Object edge) {
disconnect(edge, true);
disconnect(edge, false);
}
/**
* Disconnect edge from port.
* source indicates if port is the source of
* edge. The previous connections between edge
* and its source or target in the set is replaced.
*/
public void disconnect(Object edge, boolean source) {
connections.add(new Connection(edge, null, source));
edges.add(edge);
}
/**
* Returns true if the connection set is empty.
*/
public boolean isEmpty() {
return connections.isEmpty();
}
/**
* Returns the number of (edge, port)-pairs.
*/
public int size() {
return connections.size();
}
/**
* Returns an Iterator for the connections in this set.
*/
public Iterator connections() {
return connections.iterator();
}
/**
* Returns a Set for the edges in this connection set.
* @deprecated Use getEdges
*/
public Set getChangedEdges() {
return edges;
}
/**
* Returns the source or target of the specified edge in this connection set
* or null if the connection set contains no corresponding entry for the
* edge.
*/
public Object getPort(Object edge, boolean source) {
if (edges.contains(edge)) {
Iterator it = connections.iterator();
while (it.hasNext()) {
Connection c = (Connection) it.next();
if (c.getEdge() == edge && c.isSource() == source)
return c.getPort();
}
}
return null;
}
/**
* Creates a new connection set based on this connection set, where the
* edges, and ports are mapped using map. If a port is not
* found, the old port is used. If both, the edge and the port are not in
* map, the entry is ignored.
*
* Note: Consequently, unselected edges are only
* reconnected at the first "paste" after a "cut", because in this case the
* ConnectionSet is not cloned.
*/
public ConnectionSet clone(Map map) {
ConnectionSet cs = new ConnectionSet();
Iterator it = connections();
while (it.hasNext()) {
// Shortcut Vars
Connection c = (Connection) it.next();
Object edge = map.get(c.getEdge());
Object port = c.getPort();
if (port != null)
port = map.get(port);
// New Port
if (edge != null && port != null)
cs.connect(edge, port, c.isSource());
// Old Port
else if (edge != null)
cs.connect(edge, c.getPort(), c.isSource());
}
return cs;
}
/**
* Object that represents the connection between an edge and a port.
*/
public static class Connection implements Serializable {
/** The edge that will be connected to the port. */
protected Object edge;
/** The port that will be connected to the edge. */
protected Object port;
/** Indicates if port is the source of edge. */
protected boolean isSource;
public Connection() {
// Empty Constructor
}
/**
* Constructs a new source or target connection between
* edge and port based on the value of
* source
*/
public Connection(Object edge, Object port, boolean isSource) {
this.edge = edge;
this.port = port;
this.isSource = isSource;
}
/**
* Returns the edge of the connection.
*/
public Object getEdge() {
return edge;
}
/**
* Returns the port of the connection.
*/
public Object getPort() {
return port;
}
/**
* Returns true if port is the source of
* edge.
*/
public boolean isSource() {
return isSource;
}
/**
* Two connections are equal if they represent the source or target of
* the same edge. That is, if
*
* c1.edge == c2.edge && c1.isSource == c2.isSource.
*/
public boolean equals(Object obj) {
if (obj instanceof Connection) {
Connection other = (Connection) obj;
return (other.getEdge().equals(edge) && other.isSource() == isSource);
}
return false;
}
/**
* Ensure equality of hashCode wrt equals().
*/
public int hashCode() {
return edge.hashCode();
}
/**
* @param object
*/
public void setEdge(Object object) {
edge = object;
}
/**
* @param b
*/
public void setSource(boolean b) {
isSource = b;
}
/**
* @param object
*/
public void setPort(Object object) {
port = object;
}
}
/**
* @return the set of connections
*/
public Set getConnections() {
return connections;
}
/**
* @return the edges making us this connection set
*/
public Set getEdges() {
return edges;
}
/**
* @param set
*/
public void setConnections(Set set) {
connections = set;
}
/**
* @param set
*/
public void setEdges(Set set) {
edges = set;
}
}