Example #1
0
  @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;
  }
Example #2
0
  @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();
    }
  }