Fixing bug #166 where FileEntry would not update when file imported.

Setting up the FileEntry to be an IResourceChangeListeneer that updates
its allowed values when a file is added/changed in the project space.
This only works if clients invoke FileEntry.setProject with their Item's
current IProject instance. Otherwise, resources updates are ignored. 

Added test to FileEntryTester and verified it worked with
ReflectivityModel wave_vector file. 
Signed-off-by: amccaskey <mccaskeyaj@ornl.gov>

org.eclipse.ice.datastructures.test/src/org/eclipse/ice/datastructures/entry/test/FileEntryTester.java

@@ -123,7 +123,6 @@ public class FileEntryTester {
 			fail();
 		}
 		
-		entry.updateAvailableFiles();
 		assertEquals(14, entry.getAllowedValues().size());
 		
 		try {

org.eclipse.ice.datastructures/src/org/eclipse/ice/datastructures/entry/FileEntry.java

@@ -24,8 +24,12 @@ import javax.xml.bind.annotation.XmlTransient;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResource;
+import org.eclipse.core.resources.IResourceChangeEvent;
+import org.eclipse.core.resources.IResourceChangeListener;
+import org.eclipse.core.resources.IResourceDelta;
+import org.eclipse.core.resources.IResourceDeltaVisitor;
+import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.CoreException;
-import org.eclipse.ice.datastructures.ICEObject.IUpdateableListener;
 import org.eclipse.ice.datastructures.ICEObject.Identifiable;
 
 /**
@@ -38,7 +42,7 @@ import org.eclipse.ice.datastructures.ICEObject.Identifiable;
  */
 @XmlRootElement(name = "FileEntry")
 @XmlAccessorType(XmlAccessType.FIELD)
-public class FileEntry extends DiscreteEntry {
+public class FileEntry extends DiscreteEntry implements IResourceChangeListener {
 
 	/**
 	 * Reference to the selected file.
@@ -88,7 +92,7 @@ public class FileEntry extends DiscreteEntry {
 		super(files);
 		contextId = "org.eclipse.ice.client.widgets.FileEntry";
 	}
-	
+
 	/*
 	 * (non-Javadoc)
 	 * 
@@ -109,9 +113,12 @@ public class FileEntry extends DiscreteEntry {
 	 *            The project this Entry belongs to.
 	 */
 	public void setProject(IProject projectSpace) {
-		project = projectSpace;
-		generateAllowedValues();
-		isModified = true;
+		if (projectSpace != null) {
+			project = projectSpace;
+			generateAllowedValues();
+			isModified = true;
+			ResourcesPlugin.getWorkspace().addResourceChangeListener(this, IResourceChangeEvent.POST_CHANGE);
+		}
 	}
 
 	/*
@@ -148,14 +155,6 @@ public class FileEntry extends DiscreteEntry {
 		}
 	}
 
-	/**
-	 * Public operation that lets clients update the list of files, eg after a
-	 * file has been imported to a project.
-	 */
-	public void updateAvailableFiles() {
-		generateAllowedValues();
-	}
-
 	/*
 	 * (non-Javadoc)
 	 * 
@@ -275,14 +274,45 @@ public class FileEntry extends DiscreteEntry {
 
 		return hash;
 	}
-	
+
 	/*
 	 * (non-Javadoc)
-	 * @see org.eclipse.ice.datastructures.entry.DiscreteEntry#accept(org.eclipse.ice.datastructures.entry.IEntryVisitor)
+	 * 
+	 * @see
+	 * org.eclipse.ice.datastructures.entry.DiscreteEntry#accept(org.eclipse.ice
+	 * .datastructures.entry.IEntryVisitor)
 	 */
 	@Override
 	public void accept(IEntryVisitor visitor) {
 		visitor.visit(this);
 	}
-	
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * org.eclipse.core.resources.IResourceChangeListener#resourceChanged(org.
+	 * eclipse.core.resources.IResourceChangeEvent)
+	 */
+	@Override
+	public void resourceChanged(IResourceChangeEvent event) {
+		if (project != null) {
+			if (event.getType() == IResourceChangeEvent.POST_CHANGE) {
+				try {
+					event.getDelta().accept(new IResourceDeltaVisitor() {
+						public boolean visit(IResourceDelta delta) throws CoreException {
+							IProject p = delta.getResource().getProject();
+							if (p != null && p.getName().equals(project.getName())) {
+								generateAllowedValues();
+								notifyListeners();
+							}
+							return true;
+						}
+					});
+				} catch (CoreException e) {
+					e.printStackTrace();
+				}
+			}
+		}
+	}
 }