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/*
* Copyright 2011 Bas Leijdekkers
*
* 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.siyeh.ipp.types;
import com.intellij.codeInsight.ChangeContextUtil;
import com.intellij.codeInsight.generation.GenerateMembersUtil;
import com.intellij.codeInsight.generation.OverrideImplementUtil;
import com.intellij.codeInsight.generation.PsiGenerationInfo;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Editor;
import com.intellij.psi.*;
import com.intellij.psi.codeStyle.JavaCodeStyleManager;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.refactoring.util.RefactoringChangeUtil;
import com.intellij.util.IncorrectOperationException;
import com.intellij.util.containers.HashMap;
import com.siyeh.ipp.base.Intention;
import com.siyeh.ipp.base.PsiElementPredicate;
import org.jetbrains.annotations.NotNull;
import java.util.List;
import java.util.Map;
public class ReplaceLambdaWithAnonymousIntention extends Intention {
private static final Logger LOG = Logger.getInstance("#" + ReplaceLambdaWithAnonymousIntention.class.getName());
@NotNull
@Override
protected PsiElementPredicate getElementPredicate() {
return new LambdaPredicate();
}
@Override
protected void processIntention(@NotNull PsiElement element) throws IncorrectOperationException {
}
@Override
protected void processIntention(Editor editor, @NotNull PsiElement element) throws IncorrectOperationException {
final PsiLambdaExpression lambdaExpression = PsiTreeUtil.getParentOfType(element, PsiLambdaExpression.class);
LOG.assertTrue(lambdaExpression != null);
final PsiParameter[] paramListCopy = ((PsiParameterList)lambdaExpression.getParameterList().copy()).getParameters();
final PsiType functionalInterfaceType = lambdaExpression.getFunctionalInterfaceType();
LOG.assertTrue(functionalInterfaceType != null);
final PsiMethod method = LambdaUtil.getFunctionalInterfaceMethod(functionalInterfaceType);
LOG.assertTrue(method != null);
final String blockText = getBodyText(lambdaExpression);
if (blockText == null) return;
final PsiElementFactory psiElementFactory = JavaPsiFacade.getElementFactory(element.getProject());
PsiCodeBlock blockFromText = psiElementFactory.createCodeBlockFromText(blockText, lambdaExpression);
ChangeContextUtil.encodeContextInfo(blockFromText, true);
PsiNewExpression newExpression = (PsiNewExpression)psiElementFactory.createExpressionFromText("new " + functionalInterfaceType.getCanonicalText() + "(){}", lambdaExpression);
final PsiClass thisClass = RefactoringChangeUtil.getThisClass(lambdaExpression);
final String thisClassName = thisClass != null ? thisClass.getName() : null;
if (thisClassName != null) {
final PsiThisExpression thisAccessExpr = thisClass instanceof PsiAnonymousClass ? null : RefactoringChangeUtil
.createThisExpression(lambdaExpression.getManager(), thisClass);
ChangeContextUtil.decodeContextInfo(blockFromText, thisClass, thisAccessExpr);
final Map<PsiElement, PsiElement> replacements = new HashMap<PsiElement, PsiElement>();
blockFromText.accept(new JavaRecursiveElementWalkingVisitor() {
@Override
public void visitClass(PsiClass aClass) {}
@Override
public void visitSuperExpression(PsiSuperExpression expression) {
super.visitSuperExpression(expression);
if (expression.getQualifier() == null) {
replacements.put(expression, psiElementFactory.createExpressionFromText(thisClassName + "." + expression.getText(), expression));
}
}
@Override
public void visitMethodCallExpression(PsiMethodCallExpression expression) {
super.visitMethodCallExpression(expression);
if (thisAccessExpr != null) {
final PsiMethod psiMethod = expression.resolveMethod();
if (psiMethod != null && !psiMethod.hasModifierProperty(PsiModifier.STATIC) && expression.getMethodExpression().getQualifierExpression() == null) {
replacements.put(expression, psiElementFactory.createExpressionFromText(thisAccessExpr.getText() + "." + expression.getText(), expression));
}
}
}
});
for (PsiElement psiElement : replacements.keySet()) {
psiElement.replace(replacements.get(psiElement));
}
}
blockFromText = psiElementFactory.createCodeBlockFromText(blockFromText.getText(), null);
newExpression = (PsiNewExpression)JavaCodeStyleManager.getInstance(lambdaExpression.getProject()).shortenClassReferences(lambdaExpression.replace(newExpression));
final PsiAnonymousClass anonymousClass = newExpression.getAnonymousClass();
LOG.assertTrue(anonymousClass != null);
final List<PsiGenerationInfo<PsiMethod>> infos = OverrideImplementUtil.overrideOrImplement(anonymousClass, method);
if (infos != null && infos.size() == 1) {
final PsiMethod member = infos.get(0).getPsiMember();
final PsiParameter[] parameters = member.getParameterList().getParameters();
for (int i = 0; i < parameters.length; i++) {
final PsiParameter parameter = parameters[i];
final String lambdaParamName = paramListCopy[i].getName();
if (lambdaParamName != null) {
parameter.setName(lambdaParamName);
}
}
PsiCodeBlock codeBlock = member.getBody();
LOG.assertTrue(codeBlock != null);
codeBlock = (PsiCodeBlock)codeBlock.replace(blockFromText);
GenerateMembersUtil.positionCaret(editor, member, true);
}
}
private static String getBodyText(PsiLambdaExpression lambdaExpression) {
String blockText;
final PsiElement body = lambdaExpression.getBody();
if (body instanceof PsiExpression) {
blockText = "{";
blockText += ((PsiExpression)body).getType() == PsiType.VOID ? "" : "return ";
blockText += body.getText() + ";}";
} else if (body != null) {
blockText = body.getText();
} else {
blockText = null;
}
return blockText;
}
private static class LambdaPredicate implements PsiElementPredicate {
@Override
public boolean satisfiedBy(PsiElement element) {
final PsiLambdaExpression lambdaExpression = PsiTreeUtil.getParentOfType(element, PsiLambdaExpression.class);
if (lambdaExpression != null && (element.getParent() == lambdaExpression && element instanceof PsiJavaToken && ((PsiJavaToken)element).getTokenType() == JavaTokenType.ARROW ||
PsiTreeUtil.isAncestor(lambdaExpression.getParameterList(), element, false))) {
final PsiClass thisClass = PsiTreeUtil.getParentOfType(lambdaExpression, PsiClass.class, true);
if (thisClass == null || thisClass instanceof PsiAnonymousClass) {
final PsiElement body = lambdaExpression.getBody();
if (body == null) return false;
final boolean [] disabled = new boolean[1];
body.accept(new JavaRecursiveElementWalkingVisitor() {
@Override
public void visitThisExpression(PsiThisExpression expression) {
disabled[0] = true;
}
@Override
public void visitSuperExpression(PsiSuperExpression expression) {
disabled[0] = true;
}
});
if (disabled[0]) return false;
}
final PsiType functionalInterfaceType = lambdaExpression.getFunctionalInterfaceType();
return functionalInterfaceType != null &&
LambdaUtil.getFunctionalInterfaceMethod(functionalInterfaceType) != null &&
LambdaUtil.isLambdaFullyInferred(lambdaExpression, functionalInterfaceType) &&
LambdaUtil.isFunctionalType(functionalInterfaceType);
}
return false;
}
}
}
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