@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 sortVariableNameSuggestions(
String[] names,
final VariableKind variableKind,
@Nullable final String propertyName,
@Nullable final PsiType type) {
if (names.length <= 1) {
return;
}
if (LOG.isDebugEnabled()) {
LOG.debug("sorting names:" + variableKind);
if (propertyName != null) {
LOG.debug("propertyName:" + propertyName);
}
if (type != null) {
LOG.debug("type:" + type);
}
for (String name : names) {
int count =
JavaStatisticsManager.getVariableNameUseCount(name, variableKind, propertyName, type);
LOG.debug(name + " : " + count);
}
}
Comparator<String> comparator =
new Comparator<String>() {
@Override
public int compare(String s1, String s2) {
int count1 =
JavaStatisticsManager.getVariableNameUseCount(s1, variableKind, propertyName, type);
int count2 =
JavaStatisticsManager.getVariableNameUseCount(s2, variableKind, propertyName, type);
return count2 - count1;
}
};
Arrays.sort(names, comparator);
}