### Eclipse Workspace Patch 1.0
#P org.eclipse.gmf.examples.eclipsecon.library.diagram.custom
Index: plugin.xml
===================================================================
RCS file: /cvsroot/technology/org.eclipse.gmf/examples/org.eclipse.gmf.examples.eclipsecon.library.diagram.custom/plugin.xml,v
retrieving revision 1.1
diff -u -r1.1 plugin.xml
--- plugin.xml	16 Feb 2007 23:08:27 -0000	1.1
+++ plugin.xml	17 Feb 2007 00:03:10 -0000
@@ -21,4 +21,13 @@
          </popupContribution>
       </contributionItemProvider>
    </extension>
+   <extension
+         point="org.eclipse.gmf.runtime.diagram.ui.decoratorProviders">
+      <decoratorProvider
+            class="org.eclipse.gmf.examples.eclipsecon.library.diagram.custom.provider.BadShelfDecoratorProvider">
+         <Priority
+               name="Medium">
+         </Priority>
+      </decoratorProvider>
+   </extension>
 </plugin>
Index: src/org/eclipse/gmf/examples/eclipsecon/library/diagram/custom/decoration/BadShelfDecorator.java
===================================================================
RCS file: src/org/eclipse/gmf/examples/eclipsecon/library/diagram/custom/decoration/BadShelfDecorator.java
diff -N src/org/eclipse/gmf/examples/eclipsecon/library/diagram/custom/decoration/BadShelfDecorator.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ src/org/eclipse/gmf/examples/eclipsecon/library/diagram/custom/decoration/BadShelfDecorator.java	1 Jan 1970 00:00:00 -0000
@@ -0,0 +1,84 @@
+package org.eclipse.gmf.examples.eclipsecon.library.diagram.custom.decoration;
+
+import java.util.Collection;
+import java.util.Iterator;
+
+import org.eclipse.emf.ecore.EStructuralFeature.Setting;
+import org.eclipse.emf.transaction.TransactionalEditingDomain;
+import org.eclipse.emf.transaction.util.TransactionUtil;
+import org.eclipse.gef.EditPart;
+import org.eclipse.gef.GraphicalEditPart;
+import org.eclipse.gmf.examples.eclipsecon.library.LibraryPackage;
+import org.eclipse.gmf.examples.eclipsecon.library.Shelf;
+import org.eclipse.gmf.runtime.diagram.ui.editparts.ShapeEditPart;
+import org.eclipse.gmf.runtime.diagram.ui.services.decorator.AbstractDecorator;
+import org.eclipse.gmf.runtime.diagram.ui.services.decorator.IDecoratorTarget;
+import org.eclipse.gmf.runtime.draw2d.ui.figures.HashedCircle;
+import org.eclipse.gmf.runtime.draw2d.ui.mapmode.MapModeUtil;
+import org.eclipse.gmf.runtime.emf.core.util.CrossReferenceAdapter;
+import org.eclipse.gmf.runtime.notation.View;
+
+
+public class BadShelfDecorator
+    extends AbstractDecorator {
+    
+    public BadShelfDecorator(IDecoratorTarget decoratorTarget) {
+        super(decoratorTarget);
+    }
+
+    public void activate() {
+        refresh();        
+    }
+    
+    public void refresh() {
+        removeDecoration();
+        EditPart editPart  = (EditPart)getDecoratorTarget().getAdapter(EditPart.class);
+        View view = (View) getDecoratorTarget().getAdapter(View.class);
+        Shelf shelf = (Shelf)view.getElement();
+        int count = getEmployeeCount(shelf);
+        if (count>1){
+            int radius = MapModeUtil.getMapMode(((GraphicalEditPart)editPart).getFigure()).DPtoLP(8);
+            HashedCircle circle = new HashedCircle(HashedCircle.HashType.X,radius);
+            circle.setFill(false);
+            setDecoration(getDecoratorTarget().addShapeDecoration(circle,
+                    IDecoratorTarget.Direction.NORTH_EAST, MapModeUtil.getMapMode(((ShapeEditPart)editPart).getFigure()).DPtoLP(-4),
+                    false));
+        }
+    }
+    
+    private int getEmployeeCount(Shelf shelf) {
+        int count = 0 ;
+        CrossReferenceAdapter crossReferenceAdapter = getCrossReferenceAdapter(shelf);
+        Collection referencers = crossReferenceAdapter
+        .getNonNavigableInverseReferences(shelf);
+        if (!referencers.isEmpty()) {
+            for (Iterator iterator = referencers.iterator(); iterator.hasNext();) {
+                Setting setting = (Setting) iterator.next();
+                if (setting.getEStructuralFeature() == LibraryPackage.Literals.EMPLOYEE__SHELVES){
+                    count++;
+                
+                }
+            }
+        }
+        return count; 
+    }
+    
+    private CrossReferenceAdapter getCrossReferenceAdapter(Shelf shelf) {
+        CrossReferenceAdapter crossReferenceAdapter = CrossReferenceAdapter
+                    .getExistingCrossReferenceAdapter(shelf);
+        if (crossReferenceAdapter == null) {
+            TransactionalEditingDomain domain = TransactionUtil
+                        .getEditingDomain(shelf);
+
+               if (domain != null) {
+                    crossReferenceAdapter = CrossReferenceAdapter
+                            .getCrossReferenceAdapter(domain.getResourceSet());
+                }
+        }
+        return crossReferenceAdapter;
+    }
+
+
+
+
+}
Index: src/org/eclipse/gmf/examples/eclipsecon/library/diagram/custom/provider/BadShelfDecoratorProvider.java
===================================================================
RCS file: src/org/eclipse/gmf/examples/eclipsecon/library/diagram/custom/provider/BadShelfDecoratorProvider.java
diff -N src/org/eclipse/gmf/examples/eclipsecon/library/diagram/custom/provider/BadShelfDecoratorProvider.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ src/org/eclipse/gmf/examples/eclipsecon/library/diagram/custom/provider/BadShelfDecoratorProvider.java	1 Jan 1970 00:00:00 -0000
@@ -0,0 +1,50 @@
+package org.eclipse.gmf.examples.eclipsecon.library.diagram.custom.provider;
+
+import org.eclipse.gef.EditPart;
+import org.eclipse.gmf.examples.eclipsecon.library.Shelf;
+import org.eclipse.gmf.examples.eclipsecon.library.diagram.custom.decoration.BadShelfDecorator;
+import org.eclipse.gmf.runtime.common.core.service.AbstractProvider;
+import org.eclipse.gmf.runtime.common.core.service.IOperation;
+import org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart;
+import org.eclipse.gmf.runtime.diagram.ui.editparts.IPrimaryEditPart;
+import org.eclipse.gmf.runtime.diagram.ui.services.decorator.CreateDecoratorsOperation;
+import org.eclipse.gmf.runtime.diagram.ui.services.decorator.IDecoratorProvider;
+import org.eclipse.gmf.runtime.diagram.ui.services.decorator.IDecoratorTarget;
+
+
+public class BadShelfDecoratorProvider
+    extends AbstractProvider
+    implements IDecoratorProvider {
+
+    public void createDecorators(IDecoratorTarget decoratorTarget) {
+        EditPart ep = (EditPart)decoratorTarget.getAdapter(EditPart.class);
+        if (ep != null && ep instanceof IPrimaryEditPart) {
+            GraphicalEditPart gEP = (GraphicalEditPart)ep;
+            if (gEP.hasNotationView()){
+                decoratorTarget.installDecorator("BAD_SHELF_DECORATOR",
+                    new BadShelfDecorator(decoratorTarget));
+            }
+        }
+    }
+
+
+
+    public boolean provides(IOperation operation) {
+        if (!(operation instanceof CreateDecoratorsOperation)) {
+            return false;
+        }
+
+        IDecoratorTarget decoratorTarget = ((CreateDecoratorsOperation) operation)
+            .getDecoratorTarget();
+        
+        EditPart ep = (EditPart)decoratorTarget.getAdapter(EditPart.class);
+        if (ep instanceof GraphicalEditPart && ep instanceof IPrimaryEditPart){
+            GraphicalEditPart gEP = (GraphicalEditPart)ep;
+        if (gEP.hasNotationView()){ 
+                return (gEP.resolveSemanticElement() instanceof Shelf);
+            }
+        }
+        return false;
+    }
+
+}