Exemplo n.º 1
0
 public static int getLambdaIdx(PsiExpressionList expressionList, final PsiElement element) {
   PsiExpression[] expressions = expressionList.getExpressions();
   for (int i = 0; i < expressions.length; i++) {
     PsiExpression expression = expressions[i];
     if (PsiTreeUtil.isAncestor(expression, element, false)) {
       return i;
     }
   }
   return -1;
 }
 @Nullable
 private static InferenceSession startTopLevelInference(
     final PsiCall topLevelCall, final ParameterTypeInferencePolicy policy) {
   final JavaResolveResult result = topLevelCall.resolveMethodGenerics();
   if (result instanceof MethodCandidateInfo) {
     final PsiMethod method = ((MethodCandidateInfo) result).getElement();
     final PsiParameter[] topLevelParameters = method.getParameterList().getParameters();
     final PsiExpressionList topLevelCallArgumentList = topLevelCall.getArgumentList();
     LOG.assertTrue(topLevelCallArgumentList != null, topLevelCall);
     final PsiExpression[] topLevelArguments = topLevelCallArgumentList.getExpressions();
     return PsiResolveHelper.ourGraphGuard.doPreventingRecursion(
         topLevelCall,
         true,
         new Computable<InferenceSession>() {
           @Override
           public InferenceSession compute() {
             final InferenceSession topLevelSession =
                 new InferenceSession(
                     method.getTypeParameters(),
                     ((MethodCandidateInfo) result).getSiteSubstitutor(),
                     topLevelCall.getManager(),
                     topLevelCall,
                     policy);
             topLevelSession.initExpressionConstraints(
                 topLevelParameters,
                 topLevelArguments,
                 topLevelCall,
                 method,
                 ((MethodCandidateInfo) result).isVarargs());
             topLevelSession.infer(
                 topLevelParameters,
                 topLevelArguments,
                 topLevelCall,
                 ((MethodCandidateInfo) result).createProperties());
             return topLevelSession;
           }
         });
   }
   return null;
 }
 @Nullable
 private static PsiExpression createActualArgument(
     JavaChangeInfo changeInfo,
     final PsiExpressionList list,
     final JavaParameterInfo info,
     final boolean toInsertDefaultValue,
     final PsiExpression[] args)
     throws IncorrectOperationException {
   final PsiElementFactory factory =
       JavaPsiFacade.getInstance(list.getProject()).getElementFactory();
   final int index = info.getOldIndex();
   if (index >= 0) {
     return args[index];
   } else {
     if (toInsertDefaultValue) {
       return createDefaultValue(changeInfo, factory, info, list);
     } else {
       return factory.createExpressionFromText(info.getName(), list);
     }
   }
 }
Exemplo n.º 4
0
  private NamesByExprInfo suggestVariableNameByExpressionPlace(
      PsiExpression expr, final VariableKind variableKind, boolean correctKeywords) {
    if (expr.getParent() instanceof PsiExpressionList) {
      PsiExpressionList list = (PsiExpressionList) expr.getParent();
      PsiElement listParent = list.getParent();
      PsiSubstitutor subst = PsiSubstitutor.EMPTY;
      PsiMethod method = null;
      if (listParent instanceof PsiMethodCallExpression) {
        final JavaResolveResult resolveResult =
            ((PsiMethodCallExpression) listParent).getMethodExpression().advancedResolve(false);
        method = (PsiMethod) resolveResult.getElement();
        subst = resolveResult.getSubstitutor();
      } else {
        if (listParent instanceof PsiAnonymousClass) {
          listParent = listParent.getParent();
        }
        if (listParent instanceof PsiNewExpression) {
          method = ((PsiNewExpression) listParent).resolveConstructor();
        }
      }

      if (method != null) {
        final PsiElement navElement = method.getNavigationElement();
        if (navElement instanceof PsiMethod) {
          method = (PsiMethod) navElement;
        }
        PsiExpression[] expressions = list.getExpressions();
        int index = -1;
        for (int i = 0; i < expressions.length; i++) {
          if (expressions[i] == expr) {
            index = i;
            break;
          }
        }
        PsiParameter[] parameters = method.getParameterList().getParameters();
        if (index < parameters.length) {
          String name = parameters[index].getName();
          if (name != null
              && TypeConversionUtil.areTypesAssignmentCompatible(
                  subst.substitute(parameters[index].getType()), expr)) {
            name = variableNameToPropertyName(name, VariableKind.PARAMETER);
            String[] names = getSuggestionsByName(name, variableKind, false, correctKeywords);
            if (expressions.length == 1) {
              final String methodName = method.getName();
              String[] words = NameUtil.nameToWords(methodName);
              if (words.length > 0) {
                final String firstWord = words[0];
                if (SET_PREFIX.equals(firstWord)) {
                  final String propertyName = methodName.substring(firstWord.length());
                  final String[] setterNames =
                      getSuggestionsByName(propertyName, variableKind, false, correctKeywords);
                  names = ArrayUtil.mergeArrays(names, setterNames);
                }
              }
            }
            return new NamesByExprInfo(name, names);
          }
        }
      }
    } else if (expr.getParent() instanceof PsiAssignmentExpression
        && variableKind == VariableKind.PARAMETER) {
      final PsiAssignmentExpression assignmentExpression =
          (PsiAssignmentExpression) expr.getParent();
      if (expr == assignmentExpression.getRExpression()) {
        final PsiExpression leftExpression = assignmentExpression.getLExpression();
        if (leftExpression instanceof PsiReferenceExpression
            && ((PsiReferenceExpression) leftExpression).getQualifier() == null) {
          String name = leftExpression.getText();
          if (name != null) {
            final PsiElement resolve = ((PsiReferenceExpression) leftExpression).resolve();
            if (resolve instanceof PsiVariable) {
              name = variableNameToPropertyName(name, getVariableKind((PsiVariable) resolve));
            }
            String[] names = getSuggestionsByName(name, variableKind, false, correctKeywords);
            return new NamesByExprInfo(name, names);
          }
        }
      }
    }

    return new NamesByExprInfo(null, ArrayUtil.EMPTY_STRING_ARRAY);
  }
  @Nullable
  private static PsiExpression createDefaultValue(
      JavaChangeInfo changeInfo,
      final PsiElementFactory factory,
      final JavaParameterInfo info,
      final PsiExpressionList list)
      throws IncorrectOperationException {
    if (info.isUseAnySingleVariable()) {
      final PsiResolveHelper resolveHelper =
          JavaPsiFacade.getInstance(list.getProject()).getResolveHelper();
      final PsiType type = info.getTypeWrapper().getType(changeInfo.getMethod(), list.getManager());
      final VariablesProcessor processor =
          new VariablesProcessor(false) {
            protected boolean check(PsiVariable var, ResolveState state) {
              if (var instanceof PsiField
                  && !resolveHelper.isAccessible((PsiField) var, list, null)) return false;
              if (var instanceof PsiLocalVariable
                  && list.getTextRange().getStartOffset() <= var.getTextRange().getStartOffset())
                return false;
              if (PsiTreeUtil.isAncestor(var, list, false)) return false;
              final PsiType varType = state.get(PsiSubstitutor.KEY).substitute(var.getType());
              return type.isAssignableFrom(varType);
            }

            public boolean execute(PsiElement pe, ResolveState state) {
              super.execute(pe, state);
              return size() < 2;
            }
          };
      PsiScopesUtil.treeWalkUp(processor, list, null);
      if (processor.size() == 1) {
        final PsiVariable result = processor.getResult(0);
        return factory.createExpressionFromText(result.getName(), list);
      }
      if (processor.size() == 0) {
        final PsiClass parentClass = PsiTreeUtil.getParentOfType(list, PsiClass.class);
        if (parentClass != null) {
          PsiClass containingClass = parentClass;
          final Set<PsiClass> containingClasses = new HashSet<PsiClass>();
          while (containingClass != null) {
            if (type.isAssignableFrom(factory.createType(containingClass, PsiSubstitutor.EMPTY))) {
              containingClasses.add(containingClass);
            }
            containingClass = PsiTreeUtil.getParentOfType(containingClass, PsiClass.class);
          }
          if (containingClasses.size() == 1) {
            return RefactoringUtil.createThisExpression(
                parentClass.getManager(),
                containingClasses.contains(parentClass)
                    ? null
                    : containingClasses.iterator().next());
          }
        }
      }
    }
    final PsiCallExpression callExpression =
        PsiTreeUtil.getParentOfType(list, PsiCallExpression.class);
    final String defaultValue = info.getDefaultValue();
    return callExpression != null
        ? info.getValue(callExpression)
        : defaultValue.length() > 0 ? factory.createExpressionFromText(defaultValue, list) : null;
  }
  // This methods works equally well for primary usages as well as for propagated callers' usages
  private static void fixActualArgumentsList(
      PsiExpressionList list,
      JavaChangeInfo changeInfo,
      boolean toInsertDefaultValue,
      PsiSubstitutor substitutor)
      throws IncorrectOperationException {
    final PsiElementFactory factory =
        JavaPsiFacade.getInstance(list.getProject()).getElementFactory();
    if (changeInfo.isParameterSetOrOrderChanged()) {
      if (changeInfo instanceof JavaChangeInfoImpl
          && ((JavaChangeInfoImpl) changeInfo).isPropagationEnabled) {
        final ParameterInfoImpl[] createdParmsInfo =
            ((JavaChangeInfoImpl) changeInfo).getCreatedParmsInfoWithoutVarargs();
        for (ParameterInfoImpl info : createdParmsInfo) {
          PsiExpression newArg;
          if (toInsertDefaultValue) {
            newArg = createDefaultValue(changeInfo, factory, info, list);
          } else {
            newArg = factory.createExpressionFromText(info.getName(), list);
          }
          JavaCodeStyleManager.getInstance(list.getProject())
              .shortenClassReferences(list.add(newArg));
        }
      } else {
        final PsiExpression[] args = list.getExpressions();
        final int nonVarargCount = getNonVarargCount(changeInfo, args);
        final int varargCount = args.length - nonVarargCount;
        if (varargCount < 0) return;
        PsiExpression[] newVarargInitializers = null;

        final int newArgsLength;
        final int newNonVarargCount;
        final JavaParameterInfo[] newParms = changeInfo.getNewParameters();
        if (changeInfo.isArrayToVarargs()) {
          newNonVarargCount = newParms.length - 1;
          final JavaParameterInfo lastNewParm = newParms[newParms.length - 1];
          final PsiExpression arrayToConvert = args[lastNewParm.getOldIndex()];
          if (arrayToConvert instanceof PsiNewExpression) {
            final PsiNewExpression expression = (PsiNewExpression) arrayToConvert;
            final PsiArrayInitializerExpression arrayInitializer = expression.getArrayInitializer();
            if (arrayInitializer != null) {
              newVarargInitializers = arrayInitializer.getInitializers();
            }
          }
          newArgsLength =
              newVarargInitializers == null
                  ? newParms.length
                  : newNonVarargCount + newVarargInitializers.length;
        } else if (changeInfo.isRetainsVarargs()) {
          newNonVarargCount = newParms.length - 1;
          newArgsLength = newNonVarargCount + varargCount;
        } else if (changeInfo.isObtainsVarags()) {
          newNonVarargCount = newParms.length - 1;
          newArgsLength = newNonVarargCount;
        } else {
          newNonVarargCount = newParms.length;
          newArgsLength = newParms.length;
        }

        String[] oldVarargs = null;
        if (changeInfo.wasVararg() && !changeInfo.isRetainsVarargs()) {
          oldVarargs = new String[varargCount];
          for (int i = nonVarargCount; i < args.length; i++) {
            oldVarargs[i - nonVarargCount] = args[i].getText();
          }
        }

        final PsiExpression[] newArgs = new PsiExpression[newArgsLength];
        for (int i = 0; i < newNonVarargCount; i++) {
          if (newParms[i].getOldIndex() == nonVarargCount && oldVarargs != null) {
            PsiType type = newParms[i].createType(changeInfo.getMethod(), list.getManager());
            if (type instanceof PsiArrayType) {
              type = substitutor.substitute(type);
              type = TypeConversionUtil.erasure(type);
              String typeText = type.getCanonicalText();
              if (type instanceof PsiEllipsisType) {
                typeText = typeText.replace("...", "[]");
              }
              String text = "new " + typeText + "{" + StringUtil.join(oldVarargs, ",") + "}";
              newArgs[i] = factory.createExpressionFromText(text, changeInfo.getMethod());
              continue;
            }
          }
          newArgs[i] =
              createActualArgument(changeInfo, list, newParms[i], toInsertDefaultValue, args);
        }
        if (changeInfo.isArrayToVarargs()) {
          if (newVarargInitializers == null) {
            newArgs[newNonVarargCount] =
                createActualArgument(
                    changeInfo, list, newParms[newNonVarargCount], toInsertDefaultValue, args);
          } else {
            System.arraycopy(
                newVarargInitializers, 0, newArgs, newNonVarargCount, newVarargInitializers.length);
          }
        } else {
          final int newVarargCount = newArgsLength - newNonVarargCount;
          LOG.assertTrue(newVarargCount == 0 || newVarargCount == varargCount);
          for (int i = newNonVarargCount; i < newArgsLength; i++) {
            final int oldIndex = newParms[newNonVarargCount].getOldIndex();
            if (oldIndex >= 0 && oldIndex != nonVarargCount) {
              newArgs[i] =
                  createActualArgument(
                      changeInfo, list, newParms[newNonVarargCount], toInsertDefaultValue, args);
            } else {
              System.arraycopy(args, nonVarargCount, newArgs, newNonVarargCount, newVarargCount);
              break;
            }
          }
        }
        ChangeSignatureUtil.synchronizeList(
            list, Arrays.asList(newArgs), ExpressionList.INSTANCE, changeInfo.toRemoveParm());
      }
    }
  }
 public List<PsiExpression> getChildren(PsiExpressionList psiExpressionList) {
   return Arrays.asList(psiExpressionList.getExpressions());
 }
    @Override
    public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
      final PsiForeachStatement foreachStatement =
          PsiTreeUtil.getParentOfType(descriptor.getPsiElement(), PsiForeachStatement.class);
      if (foreachStatement != null) {
        if (!FileModificationService.getInstance().preparePsiElementForWrite(foreachStatement))
          return;
        final PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(project);
        PsiStatement body = foreachStatement.getBody();
        final PsiExpression iteratedValue = foreachStatement.getIteratedValue();
        if (body != null && iteratedValue != null) {
          final PsiParameter parameter = foreachStatement.getIterationParameter();
          final PsiIfStatement ifStatement = extractIfStatement(body);
          final PsiMethodCallExpression methodCallExpression = extractAddCall(body, ifStatement);

          if (methodCallExpression == null) return;

          if (isAddAllCall(foreachStatement, body)) {
            restoreComments(foreachStatement, body);
            final PsiExpression qualifierExpression =
                methodCallExpression.getMethodExpression().getQualifierExpression();
            final String qualifierText =
                qualifierExpression != null ? qualifierExpression.getText() : "";
            final String callText =
                StringUtil.getQualifiedName(
                    qualifierText, "addAll(" + getIteratedValueText(iteratedValue) + ");");
            PsiElement result =
                foreachStatement.replace(
                    elementFactory.createStatementFromText(callText, foreachStatement));
            reformatWhenNeeded(project, result);
            return;
          }
          final StringBuilder builder =
              new StringBuilder(getIteratedValueText(iteratedValue) + ".stream()");

          builder.append(createFiltersChainText(body, parameter, ifStatement));
          builder.append(
              createMapperFunctionalExpressionText(
                  parameter, methodCallExpression.getArgumentList().getExpressions()[0]));

          builder.append(".collect(java.util.stream.Collectors.");
          PsiElement result = null;
          try {
            final PsiExpression qualifierExpression =
                methodCallExpression.getMethodExpression().getQualifierExpression();
            if (qualifierExpression instanceof PsiReferenceExpression) {
              final PsiElement resolve = ((PsiReferenceExpression) qualifierExpression).resolve();
              if (resolve instanceof PsiVariable) {
                if (resolve instanceof PsiLocalVariable
                    && foreachStatement.equals(
                        PsiTreeUtil.skipSiblingsForward(
                            resolve.getParent(), PsiWhiteSpace.class))) {
                  final PsiExpression initializer = ((PsiVariable) resolve).getInitializer();
                  if (initializer instanceof PsiNewExpression) {
                    final PsiExpressionList argumentList =
                        ((PsiNewExpression) initializer).getArgumentList();
                    if (argumentList != null && argumentList.getExpressions().length == 0) {
                      restoreComments(foreachStatement, body);
                      final String callText =
                          builder.toString()
                              + createInitializerReplacementText(
                                  ((PsiVariable) resolve).getType(), initializer)
                              + ")";
                      result =
                          initializer.replace(
                              elementFactory.createExpressionFromText(callText, null));
                      simplifyRedundantCast(result);
                      foreachStatement.delete();
                      return;
                    }
                  }
                }
              }
            }
            restoreComments(foreachStatement, body);
            final String qualifierText =
                qualifierExpression != null ? qualifierExpression.getText() : "";
            final String callText =
                StringUtil.getQualifiedName(
                    qualifierText, "addAll(" + builder.toString() + "toList()));");
            result =
                foreachStatement.replace(
                    elementFactory.createStatementFromText(callText, foreachStatement));
            simplifyRedundantCast(result);
          } finally {
            reformatWhenNeeded(project, result);
          }
        }
      }
    }
    @Override
    public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
      final PsiForeachStatement foreachStatement =
          PsiTreeUtil.getParentOfType(descriptor.getPsiElement(), PsiForeachStatement.class);
      if (foreachStatement != null) {
        if (!FileModificationService.getInstance().preparePsiElementForWrite(foreachStatement))
          return;
        PsiStatement body = foreachStatement.getBody();
        final PsiExpression iteratedValue = foreachStatement.getIteratedValue();
        if (body != null && iteratedValue != null) {
          restoreComments(foreachStatement, body);

          final PsiParameter parameter = foreachStatement.getIterationParameter();
          final PsiIfStatement ifStmt = extractIfStatement(body);

          StringBuilder buffer = new StringBuilder(getIteratedValueText(iteratedValue));
          if (ifStmt != null) {
            final PsiStatement thenBranch = ifStmt.getThenBranch();
            LOG.assertTrue(thenBranch != null);
            buffer.append(".stream()");
            buffer.append(createFiltersChainText(body, parameter, ifStmt));
            body = thenBranch;
          }

          buffer.append(".").append(getForEachMethodName()).append("(");

          final String functionalExpressionText =
              createForEachFunctionalExpressionText(project, body, parameter);
          final PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(project);
          PsiExpressionStatement callStatement =
              (PsiExpressionStatement)
                  elementFactory.createStatementFromText(
                      buffer.toString() + functionalExpressionText + ");", foreachStatement);
          callStatement = (PsiExpressionStatement) foreachStatement.replace(callStatement);

          final PsiExpressionList argumentList =
              ((PsiCallExpression) callStatement.getExpression()).getArgumentList();
          LOG.assertTrue(argumentList != null, callStatement.getText());
          final PsiExpression[] expressions = argumentList.getExpressions();
          LOG.assertTrue(expressions.length == 1);

          if (expressions[0] instanceof PsiFunctionalExpression
              && ((PsiFunctionalExpression) expressions[0]).getFunctionalInterfaceType() == null) {
            callStatement =
                (PsiExpressionStatement)
                    callStatement.replace(
                        elementFactory.createStatementFromText(
                            buffer.toString()
                                + "("
                                + parameter.getText()
                                + ") -> "
                                + wrapInBlock(body)
                                + ");",
                            callStatement));
          }

          simplifyRedundantCast(callStatement);

          CodeStyleManager.getInstance(project)
              .reformat(
                  JavaCodeStyleManager.getInstance(project).shortenClassReferences(callStatement));
        }
      }
    }
Exemplo n.º 10
0
  @Nullable
  public static PsiType getFunctionalInterfaceType(
      PsiElement expression, final boolean tryToSubstitute, int paramIdx) {
    PsiElement parent = expression.getParent();
    PsiElement element = expression;
    while (parent instanceof PsiParenthesizedExpression
        || parent instanceof PsiConditionalExpression) {
      if (parent instanceof PsiConditionalExpression
          && ((PsiConditionalExpression) parent).getThenExpression() != element
          && ((PsiConditionalExpression) parent).getElseExpression() != element) break;
      element = parent;
      parent = parent.getParent();
    }
    if (parent instanceof PsiArrayInitializerExpression) {
      final PsiType psiType = ((PsiArrayInitializerExpression) parent).getType();
      if (psiType instanceof PsiArrayType) {
        return ((PsiArrayType) psiType).getComponentType();
      }
    } else if (parent instanceof PsiTypeCastExpression) {
      final PsiType castType = ((PsiTypeCastExpression) parent).getType();
      if (castType instanceof PsiIntersectionType) {
        for (PsiType conjunctType : ((PsiIntersectionType) castType).getConjuncts()) {
          if (getFunctionalInterfaceMethod(conjunctType) != null) return conjunctType;
        }
      }
      return castType;
    } else if (parent instanceof PsiVariable) {
      return ((PsiVariable) parent).getType();
    } else if (parent instanceof PsiAssignmentExpression
        && expression instanceof PsiExpression
        && !PsiUtil.isOnAssignmentLeftHand((PsiExpression) expression)) {
      final PsiExpression lExpression = ((PsiAssignmentExpression) parent).getLExpression();
      return lExpression.getType();
    } else if (parent instanceof PsiExpressionList) {
      final PsiExpressionList expressionList = (PsiExpressionList) parent;
      final int lambdaIdx = getLambdaIdx(expressionList, expression);
      if (lambdaIdx > -1) {

        PsiType cachedType = null;
        final Pair<PsiMethod, PsiSubstitutor> method = MethodCandidateInfo.getCurrentMethod(parent);
        if (method != null) {
          final PsiParameter[] parameters = method.first.getParameterList().getParameters();
          cachedType =
              lambdaIdx < parameters.length
                  ? method.second.substitute(
                      getNormalizedType(
                          parameters[adjustLambdaIdx(lambdaIdx, method.first, parameters)]))
                  : null;
          if (!tryToSubstitute) return cachedType;
        }

        PsiElement gParent = expressionList.getParent();

        if (gParent instanceof PsiAnonymousClass) {
          gParent = gParent.getParent();
        }

        if (gParent instanceof PsiCall) {
          final PsiCall contextCall = (PsiCall) gParent;
          final JavaResolveResult resolveResult = contextCall.resolveMethodGenerics();
          final PsiElement resolve = resolveResult.getElement();
          if (resolve instanceof PsiMethod) {
            final PsiParameter[] parameters =
                ((PsiMethod) resolve).getParameterList().getParameters();
            final int finalLambdaIdx = adjustLambdaIdx(lambdaIdx, (PsiMethod) resolve, parameters);
            if (finalLambdaIdx < parameters.length) {
              if (!tryToSubstitute) return getNormalizedType(parameters[finalLambdaIdx]);
              if (cachedType != null && paramIdx > -1) {
                final PsiMethod interfaceMethod = getFunctionalInterfaceMethod(cachedType);
                if (interfaceMethod != null) {
                  final PsiClassType.ClassResolveResult cachedResult =
                      PsiUtil.resolveGenericsClassInType(cachedType);
                  final PsiType interfaceMethodParameterType =
                      interfaceMethod.getParameterList().getParameters()[paramIdx].getType();
                  if (!dependsOnTypeParams(
                      cachedResult.getSubstitutor().substitute(interfaceMethodParameterType),
                      cachedType,
                      expression)) {
                    return cachedType;
                  }
                }
              }
              return PsiResolveHelper.ourGuard.doPreventingRecursion(
                  expression,
                  true,
                  new Computable<PsiType>() {
                    @Override
                    public PsiType compute() {
                      return resolveResult
                          .getSubstitutor()
                          .substitute(getNormalizedType(parameters[finalLambdaIdx]));
                    }
                  });
            }
          }
          return null;
        }
      }
    } else if (parent instanceof PsiReturnStatement) {
      final PsiLambdaExpression gParent =
          PsiTreeUtil.getParentOfType(parent, PsiLambdaExpression.class);
      if (gParent != null) {
        return getFunctionalInterfaceTypeByContainingLambda(gParent);
      } else {
        final PsiMethod method = PsiTreeUtil.getParentOfType(parent, PsiMethod.class);
        if (method != null) {
          return method.getReturnType();
        }
      }
    } else if (parent instanceof PsiLambdaExpression) {
      return getFunctionalInterfaceTypeByContainingLambda((PsiLambdaExpression) parent);
    }
    return null;
  }