| /* |
| * Copyright 2000-2009 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.intellij.codeInsight.daemon.impl.quickfix; |
| |
| import com.intellij.openapi.application.ApplicationManager; |
| import com.intellij.openapi.util.Computable; |
| import com.intellij.psi.*; |
| import com.intellij.psi.controlFlow.ReturnStatementsVisitor; |
| import com.intellij.psi.util.PsiTypesUtil; |
| import com.intellij.util.IncorrectOperationException; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.util.List; |
| |
| class ConvertReturnStatementsVisitor implements ReturnStatementsVisitor { |
| private final PsiElementFactory myFactory; |
| private final PsiMethod myMethod; |
| private final DeclarationSearcher mySearcher; |
| private PsiReturnStatement myLatestReturn; |
| private final String myDefaultValue; |
| |
| public ConvertReturnStatementsVisitor(final PsiElementFactory factory, final PsiMethod method, final PsiType targetType) { |
| myFactory = factory; |
| myMethod = method; |
| mySearcher = new DeclarationSearcher(myMethod, targetType); |
| myDefaultValue = PsiTypesUtil.getDefaultValueOfType(targetType); |
| } |
| |
| @Override |
| public void visit(final List<PsiReturnStatement> returnStatements) throws IncorrectOperationException { |
| final PsiReturnStatement statement = ApplicationManager.getApplication().runWriteAction(new Computable<PsiReturnStatement>() { |
| @Override |
| public PsiReturnStatement compute() { |
| return replaceReturnStatements(returnStatements); |
| } |
| }); |
| if (statement != null) { |
| myLatestReturn = statement; |
| } |
| } |
| |
| public PsiReturnStatement getLatestReturn() { |
| return myLatestReturn; |
| } |
| |
| private String generateValue(@NotNull PsiElement stopElement) { |
| final PsiVariable variable = mySearcher.getDeclaration(stopElement); |
| return variable != null ? variable.getName() : myDefaultValue; |
| } |
| |
| public PsiReturnStatement createReturnInLastStatement() throws IncorrectOperationException { |
| return ApplicationManager.getApplication().runWriteAction(new Computable<PsiReturnStatement>() { |
| @Override |
| public PsiReturnStatement compute() { |
| PsiCodeBlock body = myMethod.getBody(); |
| PsiJavaToken rBrace = body.getRBrace(); |
| if (rBrace == null) return null; |
| final String value = generateValue(rBrace); |
| PsiReturnStatement returnStatement = (PsiReturnStatement) myFactory.createStatementFromText("return " + value+";", myMethod); |
| return (PsiReturnStatement) body.addBefore(returnStatement, rBrace); |
| } |
| }); |
| } |
| |
| @Nullable |
| public PsiReturnStatement replaceReturnStatements(final List<PsiReturnStatement> currentStatements) throws IncorrectOperationException { |
| PsiReturnStatement latestReplaced = null; |
| |
| for (PsiReturnStatement returnStatement : currentStatements) { |
| if (returnStatement.getReturnValue() != null) { |
| continue; |
| } |
| final String value = generateValue(returnStatement); |
| |
| latestReplaced = (PsiReturnStatement) myFactory.createStatementFromText("return " + value+";", returnStatement.getParent()); |
| latestReplaced = (PsiReturnStatement)returnStatement.replace(latestReplaced); |
| } |
| |
| return latestReplaced; |
| } |
| } |