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/*
* 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(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 != null
&& 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;
}
}
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