public static PsiClass getProviderClass(final PsiElement element, final PsiClass topLevelClass) {
   final PsiAnnotation annotation = PsiTreeUtil.getParentOfType(element, PsiAnnotation.class);
   if (annotation != null) {
     final PsiAnnotationMemberValue value =
         annotation.findDeclaredAttributeValue("dataProviderClass");
     if (value instanceof PsiClassObjectAccessExpression) {
       final PsiTypeElement operand = ((PsiClassObjectAccessExpression) value).getOperand();
       final PsiClass psiClass = PsiUtil.resolveClassInType(operand.getType());
       if (psiClass != null) {
         return psiClass;
       }
     }
   }
   return topLevelClass;
 }
Beispiel #2
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  @Override
  public void beforeCompletion(@NotNull final CompletionInitializationContext context) {
    final PsiFile file = context.getFile();

    if (file instanceof PsiJavaFile) {
      if (context.getInvocationCount() > 0) {
        autoImport(file, context.getStartOffset() - 1, context.getEditor());

        PsiElement leaf = file.findElementAt(context.getStartOffset() - 1);
        if (leaf != null) leaf = PsiTreeUtil.prevVisibleLeaf(leaf);

        PsiVariable variable = PsiTreeUtil.getParentOfType(leaf, PsiVariable.class);
        if (variable != null) {
          PsiTypeElement typeElement = variable.getTypeElement();
          if (typeElement != null) {
            PsiType type = typeElement.getType();
            if (type instanceof PsiClassType && ((PsiClassType) type).resolve() == null) {
              autoImportReference(
                  file, context.getEditor(), typeElement.getInnermostComponentReferenceElement());
            }
          }
        }
      }

      JavaCompletionUtil.initOffsets(file, context.getOffsetMap());

      if (context.getCompletionType() == CompletionType.BASIC) {
        if (semicolonNeeded(context.getEditor(), file, context.getStartOffset())) {
          context.setDummyIdentifier(CompletionInitializationContext.DUMMY_IDENTIFIER.trim() + ";");
          return;
        }

        final PsiJavaCodeReferenceElement ref =
            PsiTreeUtil.findElementOfClassAtOffset(
                file, context.getStartOffset(), PsiJavaCodeReferenceElement.class, false);
        if (ref != null && !(ref instanceof PsiReferenceExpression)) {
          if (ref.getParent() instanceof PsiTypeElement) {
            context.setDummyIdentifier(
                CompletionInitializationContext.DUMMY_IDENTIFIER.trim() + ";");
          }

          if (JavaSmartCompletionContributor.AFTER_NEW.accepts(ref)) {
            final PsiReferenceParameterList paramList = ref.getParameterList();
            if (paramList != null && paramList.getTextLength() > 0) {
              context
                  .getOffsetMap()
                  .addOffset(
                      ConstructorInsertHandler.PARAM_LIST_START,
                      paramList.getTextRange().getStartOffset());
              context
                  .getOffsetMap()
                  .addOffset(
                      ConstructorInsertHandler.PARAM_LIST_END,
                      paramList.getTextRange().getEndOffset());
            }
          }

          return;
        }

        final PsiElement element = file.findElementAt(context.getStartOffset());

        if (psiElement().inside(PsiAnnotation.class).accepts(element)) {
          return;
        }

        context.setDummyIdentifier(CompletionInitializationContext.DUMMY_IDENTIFIER_TRIMMED);
      }
    }
  }
  public static boolean isAcceptable(
      PsiLambdaExpression lambdaExpression, final PsiType leftType, boolean checkReturnType) {
    if (leftType instanceof PsiIntersectionType) {
      for (PsiType conjunctType : ((PsiIntersectionType) leftType).getConjuncts()) {
        if (isAcceptable(lambdaExpression, conjunctType, checkReturnType)) return true;
      }
      return false;
    }
    final PsiClassType.ClassResolveResult resolveResult =
        PsiUtil.resolveGenericsClassInType(GenericsUtil.eliminateWildcards(leftType));
    final PsiClass psiClass = resolveResult.getElement();
    if (psiClass instanceof PsiAnonymousClass) {
      return isAcceptable(
          lambdaExpression, ((PsiAnonymousClass) psiClass).getBaseClassType(), checkReturnType);
    }
    final MethodSignature methodSignature = getFunction(psiClass);
    if (methodSignature == null) return false;
    final PsiParameter[] lambdaParameters = lambdaExpression.getParameterList().getParameters();
    final PsiType[] parameterTypes = methodSignature.getParameterTypes();
    if (lambdaParameters.length != parameterTypes.length) return false;
    for (int lambdaParamIdx = 0, length = lambdaParameters.length;
        lambdaParamIdx < length;
        lambdaParamIdx++) {
      PsiParameter parameter = lambdaParameters[lambdaParamIdx];
      final PsiTypeElement typeElement = parameter.getTypeElement();
      if (typeElement != null) {
        final PsiType lambdaFormalType = typeElement.getType();
        final PsiType methodParameterType = parameterTypes[lambdaParamIdx];
        if (lambdaFormalType instanceof PsiPrimitiveType) {
          if (methodParameterType instanceof PsiPrimitiveType)
            return methodParameterType.equals(lambdaFormalType);
          return false;
        }

        if (!TypeConversionUtil.erasure(lambdaFormalType)
            .isAssignableFrom(
                TypeConversionUtil.erasure(
                    GenericsUtil.eliminateWildcards(
                        resolveResult
                            .getSubstitutor()
                            .substitute(
                                methodSignature
                                    .getSubstitutor()
                                    .substitute(methodParameterType)))))) {
          return false;
        }
      }
    }
    if (checkReturnType) {
      final String uniqueVarName =
          JavaCodeStyleManager.getInstance(lambdaExpression.getProject())
              .suggestUniqueVariableName("l", lambdaExpression, true);
      String canonicalText = leftType.getCanonicalText();
      if (leftType instanceof PsiEllipsisType) {
        canonicalText = ((PsiEllipsisType) leftType).toArrayType().getCanonicalText();
      }
      final PsiStatement assignmentFromText =
          JavaPsiFacade.getElementFactory(lambdaExpression.getProject())
              .createStatementFromText(
                  canonicalText + " " + uniqueVarName + " = " + lambdaExpression.getText(),
                  lambdaExpression);
      final PsiLocalVariable localVariable =
          (PsiLocalVariable)
              ((PsiDeclarationStatement) assignmentFromText).getDeclaredElements()[0];
      LOG.assertTrue(psiClass != null);
      PsiType methodReturnType = getReturnType(psiClass, methodSignature);
      if (methodReturnType != null) {
        methodReturnType =
            resolveResult
                .getSubstitutor()
                .substitute(methodSignature.getSubstitutor().substitute(methodReturnType));
        return LambdaHighlightingUtil.checkReturnTypeCompatible(
                (PsiLambdaExpression) localVariable.getInitializer(), methodReturnType)
            == null;
      }
    }
    return true;
  }