@Override
public void selectionChanged(IStructuredSelection selection) {
try {
setEnabled(RefactoringAvailabilityTester.isGeneralizeTypeAvailable(selection));
} catch (JavaModelException e) {
if (JavaModelUtil.isExceptionToBeLogged(e)) JavaPlugin.log(e);
setEnabled(false);
}
}
private ICompilationUnit[] getCompilationUnits(IStructuredSelection selection) {
HashSet result = new HashSet();
Object[] selected = selection.toArray();
for (int i = 0; i < selected.length; i++) {
try {
if (selected[i] instanceof IJavaElement) {
IJavaElement elem = (IJavaElement) selected[i];
if (elem.exists()) {
switch (elem.getElementType()) {
case IJavaElement.TYPE:
if (elem.getParent().getElementType() == IJavaElement.COMPILATION_UNIT) {
result.add(elem.getParent());
}
break;
case IJavaElement.COMPILATION_UNIT:
result.add(elem);
break;
case IJavaElement.IMPORT_CONTAINER:
result.add(elem.getParent());
break;
case IJavaElement.PACKAGE_FRAGMENT:
collectCompilationUnits((IPackageFragment) elem, result);
break;
case IJavaElement.PACKAGE_FRAGMENT_ROOT:
collectCompilationUnits((IPackageFragmentRoot) elem, result);
break;
case IJavaElement.JAVA_PROJECT:
IPackageFragmentRoot[] roots = ((IJavaProject) elem).getPackageFragmentRoots();
for (int k = 0; k < roots.length; k++) {
collectCompilationUnits(roots[k], result);
}
break;
}
}
} else if (selected[i] instanceof LogicalPackage) {
IPackageFragment[] packageFragments = ((LogicalPackage) selected[i]).getFragments();
for (int k = 0; k < packageFragments.length; k++) {
IPackageFragment pack = packageFragments[k];
if (pack.exists()) {
collectCompilationUnits(pack, result);
}
}
}
} catch (JavaModelException e) {
if (JavaModelUtil.isExceptionToBeLogged(e)) JavaPlugin.log(e);
}
}
return (ICompilationUnit[]) result.toArray(new ICompilationUnit[result.size()]);
}
