int nPackageEntries= fPackageEntries.size();
// all type containers to be star imported
final HashSet starImportPackages= new HashSet(nPackageEntries);
// all simple type names referenced in a star-imported package, annottaed with the container
final HashMap typeReferences= new HashMap();

// iterate the internal structure of the import rewrite
for (int i= 0; i < nPackageEntries; i++) {
	PackageEntry pack= (PackageEntry) fPackageEntries.get(i);
	if (!pack.isStatic() && pack.hasStarImport(fImportOnDemandThreshold, null)) {
		starImportPackages.add(pack.getName());
		for (int k= 0; k < pack.getNumberOfImports(); k++) {
			ImportDeclEntry curr= pack.getImportAt(k);
			if (!curr.isOnDemand() && !curr.isComment()) {
				typeReferences.put(curr.getSimpleName(), pack.getName());
			}
		}
	}
}

if (starImportPackages.isEmpty()) {
	return null;
}

starImportPackages.add(fCompilationUnit.getParent().getElementName());
starImportPackages.add(JAVA_LANG);

// resulting simple names that need a explicit import
final HashSet onDemandConflicts= new HashSet();

IJavaSearchScope scope= SearchEngine.createJavaSearchScope(new IJavaElement[] { fCompilationUnit.getJavaProject() });

ITypeNameRequestor requestor= new ITypeNameRequestor() {
	public void acceptClass(char[] packageName, char[] simpleTypeName, char[][] enclosingTypeNames, String path) {
		processType(packageName, simpleTypeName, enclosingTypeNames);
	}
	public void acceptInterface(char[] packageName, char[] simpleTypeName, char[][] enclosingTypeNames, String path) {
		processType(packageName, simpleTypeName, enclosingTypeNames);
	}
	private String getTypeContainerName(char[] packageName, char[][] enclosingTypeNames) {
		StringBuffer buf= new StringBuffer();
		buf.append(packageName);
		for (int i= 0; i < enclosingTypeNames.length; i++) {
			if (buf.length() > 0)
				buf.append('.');
			buf.append(enclosingTypeNames[i]);
		}
		return buf.toString();
	}
	
	private void processType(char[] packageName, char[] simpleTypeName, char[][] enclosingTypeNames) {
		String name= new String(simpleTypeName);
		String knownContainer= (String) typeReferences.get(name);
		if (knownContainer != null) {
			String containerName= getTypeContainerName(packageName, enclosingTypeNames);
			if (starImportPackages.contains(containerName) && !knownContainer.equals(containerName)) {
				onDemandConflicts.add(name);
			}
		}
	}
};

new SearchEngine().searchAllTypeNames(null, null, SearchPattern.R_PATTERN_MATCH, IJavaSearchConstants.TYPE,
		scope, requestor, IJavaSearchConstants.WAIT_UNTIL_READY_TO_SEARCH, monitor);