### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core.tests.model
Index: src/org/eclipse/jdt/core/tests/model/JavaSearchBugsTests.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model/JavaSearchBugsTests.java,v
retrieving revision 1.107.2.1
diff -u -r1.107.2.1 JavaSearchBugsTests.java
--- src/org/eclipse/jdt/core/tests/model/JavaSearchBugsTests.java	28 Jun 2007 16:51:08 -0000	1.107.2.1
+++ src/org/eclipse/jdt/core/tests/model/JavaSearchBugsTests.java	28 Sep 2007 11:37:25 -0000
@@ -8014,4 +8014,34 @@
 		packageCollector);
 }
 
+/**
+ * @bug 204652 "Open Type": ClassCastException in conjunction with a class folder
+ * @test Ensure that no ClassCastException is thrown for a library folder with a jar like name 
+ * @see "https://bugs.eclipse.org/bugs/show_bug.cgi?id=204652"
+ */
+public void testBug204652() throws CoreException {
+	IJavaProject javaProject = getJavaProject("JavaSearchBugs");
+	IClasspathEntry[] originalRawClasspath = javaProject.getRawClasspath();
+	try {
+		addLibraryEntry(javaProject, new Path("/JavaSearchBugs/b204652.jar"), false/*not exported*/);
+		TypeNameMatchCollector collector = new TypeNameMatchCollector();
+		new SearchEngine().searchAllTypeNames(
+			"b204652".toCharArray(),
+			SearchPattern.R_EXACT_MATCH,
+			null,
+			SearchPattern.R_PREFIX_MATCH,
+			IJavaSearchConstants.TYPE,
+			getJavaSearchScopeBugs(),
+			collector,
+			IJavaSearchConstants.WAIT_UNTIL_READY_TO_SEARCH,
+			null);
+		IPackageFragment pkg = getPackage("/JavaSearchBugs/b204652.jar/b204652");
+		pkg.open(null);
+		IType result = (IType) collector.matches.get(0);
+		assertTrue("Resulting type should exist", result.exists());
+	} finally {
+		javaProject.setRawClasspath(originalRawClasspath, null);
+	}
+}
+
 }
\ No newline at end of file
Index: workspace/JavaSearchBugs/b204652.jar/b204652/X.java
===================================================================
RCS file: workspace/JavaSearchBugs/b204652.jar/b204652/X.java
diff -N workspace/JavaSearchBugs/b204652.jar/b204652/X.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ workspace/JavaSearchBugs/b204652.jar/b204652/X.java	1 Jan 1970 00:00:00 -0000
@@ -0,0 +1,3 @@
+package b204652;
+public class X {
+}
#P org.eclipse.jdt.core
Index: model/org/eclipse/jdt/internal/core/PackageFragmentRoot.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/PackageFragmentRoot.java,v
retrieving revision 1.124
diff -u -r1.124 PackageFragmentRoot.java
--- model/org/eclipse/jdt/internal/core/PackageFragmentRoot.java	26 Apr 2007 13:19:22 -0000	1.124
+++ model/org/eclipse/jdt/internal/core/PackageFragmentRoot.java	28 Sep 2007 11:37:27 -0000
@@ -330,7 +330,7 @@
 	if (!(o instanceof PackageFragmentRoot))
 		return false;
 	PackageFragmentRoot other = (PackageFragmentRoot) o;
-	return this.resource.equals(other.resource) && 
+	return getResource().equals(other.getResource()) && 
 			this.parent.equals(other.parent);
 }
 
@@ -454,8 +454,9 @@
 	}
 }		
 public String getElementName() {
-	if (this.resource instanceof IFolder)
-		return ((IFolder) this.resource).getName();
+	IResource res = getResource();
+	if (res instanceof IFolder)
+		return ((IFolder) res).getName();
 	return ""; //$NON-NLS-1$
 }
 /**
@@ -716,7 +717,7 @@
 }
 
 public int hashCode() {
-	return this.resource.hashCode();
+	return getResource().hashCode();
 }
 
 /**