source: fedd/abac-src/atnvis/src/com/algomagic/atn/EdgeUpdate.java @ b770aa0

package com.algomagic.atn;

import java.util.*;
import att.grappa.*;

public class EdgeUpdate 
    extends AbstractUpdate 
    implements Update, VisualizationConstants
{
    private String _parentNodeName;
    private NodeUpdate _childNode;
    private String _type;
    private Collection _evidence;
    private boolean _local;

    public EdgeUpdate( String parentNodeName,
                       NodeUpdate childNode,
                       String type,
                       boolean local,
                       Collection evidence,
                       int side ) {
        _parentNodeName = parentNodeName;
        _childNode = childNode;
        _type = type;
        _local = local;
        _evidence = evidence;
        _side = side;
    }

    public int initialize( VisualizationPanel visPanel ) {
        Graph graph = visPanel.getGraph( );

        _childNode.initialize( visPanel );
        Node n1 = graph.findNodeByName( _parentNodeName );
        Node n2 = graph.findNodeByName( _childNode.getName( ) );

        if( n1 != null && n2 != null ) {
            new Edge( graph, n1, n2 );
        } else {
            if( n1 == null && n1 == null ) {
                throw new RuntimeException( _parentNodeName + " === " + _childNode.getName( ) );
            } else if( n1 == null ) {
                throw new RuntimeException( _parentNodeName );
            } else if( n2 == null ) {
                throw new RuntimeException( _childNode.getName( ) );
            }
        }

        if( _local ) {
            visPanel.addCredentials( _evidence, _local );
        }
            
        return 3;
    }


    public Collection getEvidence( ) {
        return _evidence;
    }

    public boolean getLocal( ) {
        return _local;
    }

    public String getType( ) {
        return _type;
    }


    public boolean apply( VisualizationPanel visPanel ) {
        Graph graph = visPanel.getGraph( );
        Node n1 = graph.findNodeByName( _parentNodeName );
        Node n2 = graph.findNodeByName( _childNode.getName( ) );

        Edge e = getEdgeBetween( graph, n1, n2 );
        visPanel.setEdgeProperties( e, _type, _local );

        visPanel.clearSelection( );
        
        _childNode.setNew( );
        _childNode.apply( visPanel );

        if( _local == false ) {
            visPanel.addCredentials( _evidence, _local );
        }

        visPanel.highlightCredentials( _evidence, _local );

        return true;
    }

    public void undo( VisualizationPanel visPanel ) {
        Graph graph = visPanel.getGraph( );
        Node n1 = graph.findNodeByName( _parentNodeName );
        Node n2 = graph.findNodeByName( _childNode.getName( ) );

        Edge e = getEdgeBetween( graph, n1, n2 );
        _childNode.undo( visPanel );


        if( visPanel.getLocal( ) == false ) {
            visPanel.setShadow( e );
        } else {
            visPanel.setInvis( e );
        }
        
    }


    public Element getElement( VisualizationPanel visPanel ) {
        Graph graph = visPanel.getGraph( );
        Node n1 = graph.findNodeByName( _parentNodeName );
        Node n2 = graph.findNodeByName( _childNode.getName( ) );

        return getEdgeBetween( graph, n1, n2 );
    }

    public Node getChild( VisualizationPanel visPanel ) {
        Graph graph = visPanel.getGraph( );
        return graph.findNodeByName( _childNode.getName( ) );
    }

    public String getChildName( ) {
        return _childNode.getName( );
    }



    private Edge getEdgeBetween( Graph g, Node head, Node tail ) {
        Enumeration edges = head.edgeElements( );
        while( edges.hasMoreElements( ) ) {
            Edge e = (Edge) edges.nextElement( );
            Node t = e.getHead( );
            Node h = e.getTail( );
            
            if( h.getName( ).equals( head.getName( ) ) && t.getName( ).equals( tail.getName( ) ) ) {
                return e;
            }
        }

        return null;
    }


}