Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/uml/diagram/GraphChangeAdapter.java
// $Id: GraphChangeAdapter.java 12739 2007-06-01 20:31:43Z mvw $
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// software and its documentation without fee, and without a written
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package org.argouml.uml.diagram;

import org.argouml.model.DiDiagram;
import org.argouml.model.DiElement;
import org.argouml.model.Model;
import org.tigris.gef.graph.GraphEvent;
import org.tigris.gef.graph.GraphListener;
import org.tigris.gef.graph.GraphModel;
import org.tigris.gef.presentation.Fig;

/**
 * Adapts changes in the Diagram subsystem (the graph presentation layer)
 * to changes in the Model subsyetm (diagram interchange model).
 * The curent implementaion does this by listening to graph events and
 * forwarding those as specific calls to the DiagramInterchangeModel.
 * This should be changed to a more standard Adapter architecture that
 * provides an interface for Figs and GraphModels to call only when required.
 *
 * @author Bob Tarling
 * @stereotype singleton
 */
public final class GraphChangeAdapter implements GraphListener {
    /**
     * The instance.
     */
    private static final GraphChangeAdapter INSTANCE =
        new GraphChangeAdapter();

    /**
     * The getter for the instance.
     *
     * @return The instance.
     */
    public static GraphChangeAdapter getInstance() {
        return INSTANCE;
    }

    /**
     * The constructor of a singleton is private.
     */
    private GraphChangeAdapter() {
        // singleton, no instantiation
    }

    public DiDiagram createDiagram(Class type, Object owner) {
        if (Model.getDiagramInterchangeModel() != null) {
            return Model.getDiagramInterchangeModel()
                .createDiagram(type, owner);
        }
        return null;
    }


    public void removeDiagram(DiDiagram dd) {
        if (Model.getDiagramInterchangeModel() != null) {
            Model.getDiagramInterchangeModel().deleteDiagram(dd);
        }
    }

    public DiElement createElement(GraphModel gm, Object node) {
        if (Model.getDiagramInterchangeModel() != null) {
            return Model.getDiagramInterchangeModel().createElement(
                ((UMLMutableGraphSupport) gm).getDiDiagram(), node);
        }
        return null;
    }

    public void removeElement(DiElement element) {
        if (Model.getDiagramInterchangeModel() != null) {
            Model.getDiagramInterchangeModel().deleteElement(element);
        }
    }

    /*
     * @see org.tigris.gef.graph.GraphListener#nodeAdded(org.tigris.gef.graph.GraphEvent)
     */
    public void nodeAdded(GraphEvent e) {
        Object source = e.getSource();
        Object arg = e.getArg();
        if (source instanceof Fig) {
            source = ((Fig) source).getOwner();
        }
        if (arg instanceof Fig) {
            arg = ((Fig) arg).getOwner();
        }
        Model.getDiagramInterchangeModel().nodeAdded(source, arg);
    }

    /*
     * @see org.tigris.gef.graph.GraphListener#edgeAdded(org.tigris.gef.graph.GraphEvent)
     */
    public void edgeAdded(GraphEvent e) {
        Object source = e.getSource();
        Object arg = e.getArg();
        if (source instanceof Fig) {
            source = ((Fig) source).getOwner();
        }
        if (arg instanceof Fig) {
            arg = ((Fig) arg).getOwner();
        }
        Model.getDiagramInterchangeModel().edgeAdded(source, arg);
    }

    /*
     * @see org.tigris.gef.graph.GraphListener#nodeRemoved(org.tigris.gef.graph.GraphEvent)
     */
    public void nodeRemoved(GraphEvent e) {
        Object source = e.getSource();
        Object arg = e.getArg();
        if (source instanceof Fig) {
            source = ((Fig) source).getOwner();
        }
        if (arg instanceof Fig) {
            arg = ((Fig) arg).getOwner();
        }
        Model.getDiagramInterchangeModel().nodeRemoved(source, arg);
    }

    /*
     * @see org.tigris.gef.graph.GraphListener#edgeRemoved(org.tigris.gef.graph.GraphEvent)
     */
    public void edgeRemoved(GraphEvent e) {
        Object source = e.getSource();
        Object arg = e.getArg();
        if (source instanceof Fig) {
            source = ((Fig) source).getOwner();
        }
        if (arg instanceof Fig) {
            arg = ((Fig) arg).getOwner();
        }
        Model.getDiagramInterchangeModel().edgeRemoved(source, arg);
    }

    /*
     * @see org.tigris.gef.graph.GraphListener#graphChanged(org.tigris.gef.graph.GraphEvent)
     */
    public void graphChanged(GraphEvent e) {
        Object source = e.getSource();
        Object arg = e.getArg();
        if (source instanceof Fig) {
            source = ((Fig) source).getOwner();
        }
        if (arg instanceof Fig) {
            arg = ((Fig) arg).getOwner();
        }
        Model.getDiagramInterchangeModel().graphChanged(source, arg);
    }
}
