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/*
* Copyright 2000-2012 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.codeInspection;
import com.intellij.codeInsight.daemon.GroupNames;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import com.intellij.pom.java.LanguageLevel;
import com.intellij.psi.*;
import com.intellij.psi.codeStyle.JavaCodeStyleManager;
import com.intellij.psi.util.PsiUtil;
import com.intellij.psi.util.RedundantCastUtil;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;
/**
* User: anna
*/
public class AnonymousCanBeMethodReferenceInspection extends BaseJavaBatchLocalInspectionTool {
public static final Logger LOG = Logger.getInstance("#" + AnonymousCanBeMethodReferenceInspection.class.getName());
@Nls
@NotNull
@Override
public String getGroupDisplayName() {
return GroupNames.LANGUAGE_LEVEL_SPECIFIC_GROUP_NAME;
}
@Nls
@NotNull
@Override
public String getDisplayName() {
return "Anonymous type can be replaced with method reference";
}
@Override
public boolean isEnabledByDefault() {
return true;
}
@NotNull
@Override
public String getShortName() {
return "Anonymous2MethodRef";
}
@NotNull
@Override
public PsiElementVisitor buildVisitor(@NotNull final ProblemsHolder holder, boolean isOnTheFly) {
return new JavaElementVisitor() {
@Override
public void visitAnonymousClass(PsiAnonymousClass aClass) {
super.visitAnonymousClass(aClass);
if (PsiUtil.getLanguageLevel(aClass).isAtLeast(LanguageLevel.JDK_1_8)) {
final PsiClassType baseClassType = aClass.getBaseClassType();
if (LambdaUtil.isFunctionalType(baseClassType)) {
final PsiMethod[] methods = aClass.getMethods();
if (methods.length == 1 && aClass.getFields().length == 0) {
final PsiCodeBlock body = methods[0].getBody();
final PsiCallExpression callExpression =
LambdaCanBeMethodReferenceInspection
.canBeMethodReferenceProblem(body, methods[0].getParameterList().getParameters(), baseClassType);
if (callExpression != null) {
final PsiMethod resolveMethod = callExpression.resolveMethod();
if (resolveMethod != methods[0] && !AnonymousCanBeLambdaInspection.functionalInterfaceMethodReferenced(resolveMethod, aClass)) {
final PsiElement parent = aClass.getParent();
if (parent instanceof PsiNewExpression) {
final PsiJavaCodeReferenceElement classReference = ((PsiNewExpression)parent).getClassOrAnonymousClassReference();
if (classReference != null) {
final PsiElement lBrace = aClass.getLBrace();
LOG.assertTrue(lBrace != null);
final TextRange rangeInElement = new TextRange(0, aClass.getStartOffsetInParent() + lBrace.getStartOffsetInParent());
holder.registerProblem(parent,
"Anonymous #ref #loc can be replaced with method reference", ProblemHighlightType.LIKE_UNUSED_SYMBOL, rangeInElement, new ReplaceWithMethodRefFix());
}
}
}
}
}
}
}
}
};
}
private static class ReplaceWithMethodRefFix implements LocalQuickFix {
@NotNull
@Override
public String getName() {
return "Replace with method reference";
}
@NotNull
@Override
public String getFamilyName() {
return getName();
}
@Override
public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
final PsiElement element = descriptor.getPsiElement();
if (element instanceof PsiNewExpression) {
final PsiAnonymousClass anonymousClass = ((PsiNewExpression)element).getAnonymousClass();
if (anonymousClass == null) return;
final PsiMethod[] methods = anonymousClass.getMethods();
if (methods.length != 1) return;
final PsiParameter[] parameters = methods[0].getParameterList().getParameters();
final PsiCallExpression callExpression = LambdaCanBeMethodReferenceInspection
.canBeMethodReferenceProblem(methods[0].getBody(), parameters, anonymousClass.getBaseClassType());
if (callExpression == null) return;
final String methodRefText =
LambdaCanBeMethodReferenceInspection.createMethodReferenceText(callExpression, anonymousClass.getBaseClassType(), parameters);
if (methodRefText != null) {
final String canonicalText = anonymousClass.getBaseClassType().getCanonicalText();
final PsiExpression psiExpression = JavaPsiFacade.getElementFactory(project).createExpressionFromText("(" + canonicalText + ")" + methodRefText, anonymousClass);
PsiElement castExpr = anonymousClass.getParent().replace(psiExpression);
if (RedundantCastUtil.isCastRedundant((PsiTypeCastExpression)castExpr)) {
final PsiExpression operand = ((PsiTypeCastExpression)castExpr).getOperand();
LOG.assertTrue(operand != null);
castExpr = castExpr.replace(operand);
}
JavaCodeStyleManager.getInstance(project).shortenClassReferences(castExpr);
}
}
}
}
}
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