| /* |
| * 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.codeInsight.FileModificationService; |
| import com.intellij.codeInsight.daemon.QuickFixBundle; |
| import com.intellij.codeInsight.intention.IntentionAction; |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.openapi.editor.Editor; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.PsiTypesUtil; |
| import com.intellij.util.IncorrectOperationException; |
| import com.intellij.util.containers.ContainerUtil; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class AddReturnFix implements IntentionAction { |
| private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.daemon.impl.quickfix.AddReturnFix"); |
| private final PsiMethod myMethod; |
| |
| public AddReturnFix(@NotNull PsiMethod method) { |
| myMethod = method; |
| } |
| |
| @Override |
| @NotNull |
| public String getText() { |
| return QuickFixBundle.message("add.return.statement.family"); |
| } |
| |
| @Override |
| @NotNull |
| public String getFamilyName() { |
| return QuickFixBundle.message("add.return.statement.text"); |
| } |
| |
| @Override |
| public boolean isAvailable(@NotNull Project project, Editor editor, PsiFile file) { |
| return myMethod.isValid() && |
| myMethod.getManager().isInProject(myMethod) && |
| myMethod.getBody() != null && |
| myMethod.getBody().getRBrace() != null |
| ; |
| } |
| |
| @Override |
| public void invoke(@NotNull Project project, Editor editor, PsiFile file) { |
| if (!FileModificationService.getInstance().prepareFileForWrite(myMethod.getContainingFile())) return; |
| |
| try { |
| String value = suggestReturnValue(); |
| PsiElementFactory factory = JavaPsiFacade.getInstance(myMethod.getProject()).getElementFactory(); |
| PsiReturnStatement returnStatement = (PsiReturnStatement) factory.createStatementFromText("return " + value+";", myMethod); |
| PsiCodeBlock body = myMethod.getBody(); |
| returnStatement = (PsiReturnStatement) body.addBefore(returnStatement, body.getRBrace()); |
| |
| MethodReturnTypeFix.selectReturnValueInEditor(returnStatement, editor); |
| } |
| catch (IncorrectOperationException e) { |
| LOG.error(e); |
| } |
| } |
| |
| private String suggestReturnValue() { |
| PsiType type = myMethod.getReturnType(); |
| // first try to find suitable local variable |
| PsiVariable[] variables = getDeclaredVariables(myMethod); |
| for (PsiVariable variable : variables) { |
| PsiType varType = variable.getType(); |
| if (varType.equals(type)) { |
| return variable.getName(); |
| } |
| } |
| return PsiTypesUtil.getDefaultValueOfType(type); |
| } |
| |
| private static PsiVariable[] getDeclaredVariables(PsiMethod method) { |
| List<PsiVariable> variables = new ArrayList<PsiVariable>(); |
| PsiStatement[] statements = method.getBody().getStatements(); |
| for (PsiStatement statement : statements) { |
| if (statement instanceof PsiDeclarationStatement) { |
| PsiElement[] declaredElements = ((PsiDeclarationStatement)statement).getDeclaredElements(); |
| for (PsiElement declaredElement : declaredElements) { |
| if (declaredElement instanceof PsiLocalVariable) variables.add((PsiVariable)declaredElement); |
| } |
| } |
| } |
| PsiParameter[] parameters = method.getParameterList().getParameters(); |
| ContainerUtil.addAll(variables, parameters); |
| return variables.toArray(new PsiVariable[variables.size()]); |
| } |
| |
| @Override |
| public boolean startInWriteAction() { |
| return true; |
| } |
| |
| } |