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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.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;
}
}
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