/**
   * Allows to check if static import may be performed for the given element.
   *
   * @param element element to check
   * @return target class that may be statically imported if any; <code>null</code> otherwise
   */
  @Nullable
  public static PsiClass getClassToPerformStaticImport(@NotNull PsiElement element) {
    if (!PsiUtil.isLanguageLevel5OrHigher(element)) return null;
    if (!(element instanceof PsiIdentifier)
        || !(element.getParent() instanceof PsiJavaCodeReferenceElement)) {
      return null;
    }
    PsiJavaCodeReferenceElement refExpr = (PsiJavaCodeReferenceElement) element.getParent();
    if (refExpr instanceof PsiMethodReferenceExpression) return null;
    final PsiElement gParent = refExpr.getParent();
    if (gParent instanceof PsiMethodReferenceExpression) return null;
    if (!(gParent instanceof PsiJavaCodeReferenceElement)
        || isParameterizedReference((PsiJavaCodeReferenceElement) gParent)) return null;

    PsiElement resolved = refExpr.resolve();
    if (!(resolved instanceof PsiClass)) {
      return null;
    }
    PsiClass psiClass = (PsiClass) resolved;
    if (PsiUtil.isFromDefaultPackage(psiClass)
        || psiClass.hasModifierProperty(PsiModifier.PRIVATE)
        || psiClass.getQualifiedName() == null) return null;

    final PsiElement ggParent = gParent.getParent();
    if (ggParent instanceof PsiMethodCallExpression) {
      final PsiMethodCallExpression call = (PsiMethodCallExpression) ggParent.copy();
      final PsiElement qualifier = call.getMethodExpression().getQualifier();
      if (qualifier == null) return null;
      qualifier.delete();
      final PsiMethod method = call.resolveMethod();
      if (method != null && method.getContainingClass() != psiClass) return null;
    } else {
      final PsiJavaCodeReferenceElement copy = (PsiJavaCodeReferenceElement) gParent.copy();
      final PsiElement qualifier = copy.getQualifier();
      if (qualifier == null) return null;
      qualifier.delete();
      final PsiElement target = copy.resolve();
      if (target != null && PsiTreeUtil.getParentOfType(target, PsiClass.class) != psiClass)
        return null;
    }

    PsiFile file = refExpr.getContainingFile();
    if (!(file instanceof PsiJavaFile)) return null;
    PsiImportList importList = ((PsiJavaFile) file).getImportList();
    if (importList == null) return null;

    return psiClass;
  }
Exemple #2
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  @Override
  public ASTNode process(
      @NotNull ASTNode element,
      boolean addImports,
      boolean incompleteCode,
      boolean useFqInJavadoc,
      boolean useFqInCode) {
    IElementType elementType = element.getElementType();
    if ((elementType == JavaElementType.JAVA_CODE_REFERENCE
            || elementType == JavaElementType.REFERENCE_EXPRESSION)
        && !isAnnotated(element)) {
      IElementType parentType = element.getTreeParent().getElementType();
      if (elementType == JavaElementType.JAVA_CODE_REFERENCE
          || incompleteCode
          || parentType == JavaElementType.REFERENCE_EXPRESSION
          || parentType == JavaElementType.METHOD_REF_EXPRESSION) {
        PsiJavaCodeReferenceElement ref = (PsiJavaCodeReferenceElement) element.getPsi();

        PsiReferenceParameterList parameterList = ref.getParameterList();
        if (parameterList != null) {
          PsiTypeElement[] typeParameters = parameterList.getTypeParameterElements();
          for (PsiTypeElement typeParameter : typeParameters) {
            process(
                typeParameter.getNode(), addImports, incompleteCode, useFqInJavadoc, useFqInCode);
          }
        }

        boolean rightKind = true;
        if (elementType == JavaElementType.JAVA_CODE_REFERENCE) {
          PsiJavaCodeReferenceElementImpl impl = (PsiJavaCodeReferenceElementImpl) element;
          int kind = impl.getKind(impl.getContainingFile());
          rightKind =
              kind == PsiJavaCodeReferenceElementImpl.CLASS_NAME_KIND
                  || kind == PsiJavaCodeReferenceElementImpl.CLASS_OR_PACKAGE_NAME_KIND;
        }

        if (rightKind) {
          // annotations may jump out of reference (see PsiJavaCodeReferenceImpl#setAnnotations())
          // so they should be processed first
          List<PsiAnnotation> annotations =
              PsiTreeUtil.getChildrenOfTypeAsList(ref, PsiAnnotation.class);
          for (PsiAnnotation annotation : annotations) {
            process(annotation.getNode(), addImports, incompleteCode, useFqInJavadoc, useFqInCode);
          }

          boolean isInsideDocComment =
              TreeUtil.findParent(element, JavaDocElementType.DOC_COMMENT) != null;
          boolean isShort = !ref.isQualified();
          if (isInsideDocComment ? !useFqInJavadoc : !useFqInCode) {
            if (isShort) return element; // short name already, no need to change
          }

          PsiElement refElement;
          if (!incompleteCode) {
            refElement = ref.resolve();
          } else {
            PsiResolveHelper helper =
                JavaPsiFacade.getInstance(ref.getManager().getProject()).getResolveHelper();
            final SourceJavaCodeReference reference = (SourceJavaCodeReference) element;
            refElement = helper.resolveReferencedClass(reference.getClassNameText(), ref);
          }

          if (refElement instanceof PsiClass) {
            PsiClass psiClass = (PsiClass) refElement;
            if (isInsideDocComment ? useFqInJavadoc : useFqInCode) {
              String qName = psiClass.getQualifiedName();
              if (qName == null) return element;

              PsiFile file = ref.getContainingFile();
              if (file instanceof PsiJavaFile) {
                if (ImportHelper.isImplicitlyImported(qName, (PsiJavaFile) file)) {
                  if (isShort) return element;
                  return makeShortReference((CompositeElement) element, psiClass, addImports);
                }

                String thisPackageName = ((PsiJavaFile) file).getPackageName();
                if (ImportHelper.hasPackage(qName, thisPackageName)) {
                  if (!isShort) {
                    return makeShortReference((CompositeElement) element, psiClass, addImports);
                  }
                }
              }

              return replaceReferenceWithFQ(element, psiClass);
            } else {
              int oldLength = element.getTextLength();
              ASTNode treeElement =
                  makeShortReference((CompositeElement) element, psiClass, addImports);
              if (treeElement.getTextLength() == oldLength
                  && psiClass.getContainingClass() != null) {
                PsiElement qualifier = ref.getQualifier();
                if (qualifier instanceof PsiJavaCodeReferenceElement
                    && ((PsiJavaCodeReferenceElement) qualifier).resolve() instanceof PsiClass) {
                  process(
                      qualifier.getNode(), addImports, incompleteCode, useFqInJavadoc, useFqInCode);
                }
              }
              return treeElement;
            }
          }
        }
      }
    }

    for (ASTNode child = element.getFirstChildNode(); child != null; child = child.getTreeNext()) {
      //noinspection AssignmentToForLoopParameter
      child = process(child, addImports, incompleteCode, useFqInJavadoc, useFqInCode);
    }

    return element;
  }