Description Harold Gartner 2011-03-01 13:10:43 EST

Build Identifier: wtp-sdk-R-3.2.3-20110217214612

As part of the edit model used for our editor (which is an extension of org.eclipse.wst.common.internal.emfworkbench.integration.EditModel), there is an instance of the org.eclipse.wst.common.internal.emfworkbench.integration.ResourceSetWorkbenchEditSynchronizer class attached to the edit model.

When resources are deleted and then saved in our editor, the method ResourceSetWorkbenchEditSynchronizer.getResources(IFile aFile) is called to determine which resources to unload from the resource set.  It does this by comparing the URI of the IFile passed in to the resources in the resource set.  The method code is this:

	protected List getResources(IFile aFile) {

		List resources = new ArrayList();
		List allResources = resourceSet.getResources();
		for (Iterator iterator = allResources.iterator(); iterator.hasNext();) {
			Resource res = (Resource) iterator.next();
			URI resURI = res.getURI();
			String resURIString = ""; //$NON-NLS-1$
			if (resURI.path() != null) {
				IPath resURIPath;
				if (WorkbenchResourceHelper.isPlatformResourceURI(resURI))
					resURIPath = new Path(URI.decode(resURI.path())).removeFirstSegments(2);
				else
					resURIPath = new Path(URI.decode(resURI.path())).removeFirstSegments(1);
				resURIString = resURIPath.toString();
			}
			if (!resURIString.equals("") && aFile.getFullPath().toString().indexOf(resURIString) != -1) //$NON-NLS-1$
				resources.add(res);
		}
		return resources;
	}

The problem here is the last test in the loop which is doing this:

if (!resURIString.equals("") && aFile.getFullPath().toString().indexOf(resURIString) != -1) 

The problem is the use of 'indexOf' here.  This is incorrect.  An 'equals' call should be used here as using 'indexOf' will match similarly named resources and unload them from the resource set.  This erroneous unloading then causes our editor to behave erratically as many NPEs are hit as the 'eResource()' call on the resource in the resource set now returns a null value when it still should be loaded in the resource set.

The code should be like this:

if (!resURIString.equals("") && aFile.getFullPath().toString().equals(resURIString)) //$NON-NLS-1$

Here are some examples:

IFile passed in:
aFile.getFullPath().toString() == Export1.export
URI in resSet == Export1.exportex

This will match even thought the file extensions are different.

aFile.getFullPath().toString() == SCAExport1.export
URI in resSet == Export1.export

This will match even thought the file names are different.

Reproducible: Always