/** Create a node at the most recent popup location */
private void createNode(int x, int y) {
QueryNode qn = queryGraph.createNode();
Node node = new Node(this, qn);
// make it the head node if it is currently the only node
if (queryGraph.getNumNodes() == 1) {
node.setHeadNode(true);
setHeadNode(node);
}
// place on the screen
node.setLocation(x, y);
this.add(node);
this.repaint();
// add the popup
NodeListener listener = new NodeListener(node, this);
node.addMouseListener(listener);
node.addMouseMotionListener(listener);
// select this new node
selectNode(node);
fireEvent(node, GRAPH_CHANGED);
System.out.println(qn.label);
}
private void deleteGraphEdge(Edge edge) {
// make sure we aren't deleting a null edge
assert (edge != null);
assert (edge.type == Edge.Type.GRAPH_EDGE);
// deselect if necessary
if (edge == selectedItem) selectEdge(null);
queryGraph.removeEdge(edge.getQueryEdge());
graphEdges.remove(edge);
// signal deletion
fireEvent(edge, GRAPH_CHANGED);
}
private Edge createEdge(Node n1, Node n2, boolean select) {
QueryEdge qe = queryGraph.createEdge(n1.getQueryNode(), n2.getQueryNode());
if (qe == null) return null;
Edge edge = new Edge(n1, n2, qe);
graphEdges.add(edge);
// select the edge after creating it
if (select) selectEdge(edge);
fireEvent(edge, GRAPH_CHANGED);
System.out.println("Created edge");
return edge;
}
/**
* deletes the selected node, usually
*
* @param node
* @param b
*/
public void deleteNode(Node node, boolean forceHeadNodeDeletion) {
assert (node != null);
if (node == headNode && !forceHeadNodeDeletion) return;
// delete all of the connected edges
List<QueryEdge> adjacentEdges = node.getQueryNode().getEdges();
for (QueryEdge e : adjacentEdges) deleteGraphEdge(e.getOwner());
// deselect the node if already selected
if (node == selectedItem) selectNode(null);
// delete the node from the query graph
queryGraph.removeNode(node.getQueryNode());
// remove the component from the panel
this.remove(node);
// signal deletion
fireEvent(node, GRAPH_CHANGED);
}
public void clearGraph() {
List<QueryNode> nodeList = queryGraph.getNodes();
for (QueryNode n : nodeList) deleteNode(n.getOwner(), true);
}
/*
* Get the text query represented by the underlying graph
*/
public String getQuery() {
if (queryGraph.getNumNodes() == 0) return "";
return queryGraph.toTregexQuery(headNode.getQueryNode());
}
private void updatePopupMenu() {
addEdgeItem.setEnabled(queryGraph.getNumNodes() > 1);
if (targetNode != null) deleteNodeItem.setEnabled(!targetNode.isHeadNode());
}
