@Override
@Nullable
public Collection<PsiImportStatementBase> findRedundantImports(final PsiJavaFile file) {
final PsiImportList importList = file.getImportList();
if (importList == null) return null;
final PsiImportStatementBase[] imports = importList.getAllImportStatements();
if (imports.length == 0) return null;
Set<PsiImportStatementBase> allImports =
new THashSet<PsiImportStatementBase>(Arrays.asList(imports));
final Collection<PsiImportStatementBase> redundant;
if (FileTypeUtils.isInServerPageFile(file)) {
// remove only duplicate imports
redundant = ContainerUtil.newIdentityTroveSet();
ContainerUtil.addAll(redundant, imports);
redundant.removeAll(allImports);
for (PsiImportStatementBase importStatement : imports) {
if (importStatement instanceof JspxImportStatement
&& importStatement.isForeignFileImport()) {
redundant.remove(importStatement);
}
}
} else {
redundant = allImports;
final List<PsiFile> roots = file.getViewProvider().getAllFiles();
for (PsiElement root : roots) {
root.accept(
new JavaRecursiveElementWalkingVisitor() {
@Override
public void visitReferenceElement(PsiJavaCodeReferenceElement reference) {
if (!reference.isQualified()) {
final JavaResolveResult resolveResult = reference.advancedResolve(false);
if (!inTheSamePackage(file, resolveResult.getElement())) {
final PsiElement resolveScope = resolveResult.getCurrentFileResolveScope();
if (resolveScope instanceof PsiImportStatementBase) {
final PsiImportStatementBase importStatementBase =
(PsiImportStatementBase) resolveScope;
redundant.remove(importStatementBase);
}
}
}
super.visitReferenceElement(reference);
}
private boolean inTheSamePackage(PsiJavaFile file, PsiElement element) {
if (element instanceof PsiClass
&& ((PsiClass) element).getContainingClass() == null) {
final PsiFile containingFile = element.getContainingFile();
if (containingFile instanceof PsiJavaFile) {
return Comparing.strEqual(
file.getPackageName(), ((PsiJavaFile) containingFile).getPackageName());
}
}
return false;
}
});
}
}
return redundant;
}
private static void assertOrder(PsiJavaFile file, @NonNls String... expectedOrder) {
PsiImportStatementBase[] statements = file.getImportList().getAllImportStatements();
assertEquals(expectedOrder.length, statements.length);
for (int i = 0; i < statements.length; i++) {
PsiImportStatementBase statement = statements[i];
String text = StringUtil.trimEnd(StringUtil.trimStart(statement.getText(), "import "), ";");
assertEquals(expectedOrder[i], text);
}
}
@Override
public void removeRedundantImports(@NotNull final PsiJavaFile file)
throws IncorrectOperationException {
final Collection<PsiImportStatementBase> redundant = findRedundantImports(file);
if (redundant == null) return;
for (final PsiImportStatementBase importStatement : redundant) {
final PsiJavaCodeReferenceElement ref = importStatement.getImportReference();
// Do not remove non-resolving refs
if (ref == null || ref.resolve() == null) {
continue;
}
importStatement.delete();
}
}