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/*
* Copyright 2000-2014 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.psi.impl.search;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Computable;
import com.intellij.psi.*;
import com.intellij.psi.impl.java.stubs.index.JavaMethodParameterTypesIndex;
import com.intellij.psi.search.EverythingGlobalScope;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.psi.search.SearchScope;
import com.intellij.psi.search.searches.FunctionalExpressionSearch;
import com.intellij.psi.search.searches.MethodReferencesSearch;
import com.intellij.psi.search.searches.ReferencesSearch;
import com.intellij.psi.util.PsiUtil;
import com.intellij.psi.util.PsiUtilCore;
import com.intellij.util.Processor;
import com.intellij.util.QueryExecutor;
import org.jetbrains.annotations.NotNull;
import java.util.Collection;
public class JavaFunctionalExpressionSearcher implements QueryExecutor<PsiFunctionalExpression, FunctionalExpressionSearch.SearchParameters> {
@Override
public boolean execute(@NotNull final FunctionalExpressionSearch.SearchParameters queryParameters,
@NotNull final Processor<PsiFunctionalExpression> consumer) {
final PsiClass aClass = queryParameters.getElementToSearch();
if (ApplicationManager.getApplication().runReadAction(new Computable<Boolean>() {
@Override
public Boolean compute() {
return !LambdaUtil.isFunctionalClass(aClass) || !PsiUtil.isLanguageLevel8OrHigher(aClass);
}
})) {
return true;
}
return collectFunctionalExpressions(aClass, ApplicationManager.getApplication().runReadAction(new Computable<SearchScope>() {
@Override
public SearchScope compute() {
return queryParameters.getEffectiveSearchScope();
}
}), consumer);
}
public static boolean collectFunctionalExpressions(final PsiClass aClass,
final SearchScope searchScope,
final Processor<PsiFunctionalExpression> consumer) {
final SearchScope classScope = ApplicationManager.getApplication().runReadAction(new Computable<SearchScope>() {
@Override
public SearchScope compute() {
return aClass.getUseScope();
}
});
final SearchScope useScope = ApplicationManager.getApplication().runReadAction(new Computable<SearchScope>() {
@Override
public SearchScope compute() {
return searchScope.intersectWith(classScope);
}
});
final Project project = PsiUtilCore.getProjectInReadAction(aClass);
final GlobalSearchScope scope = useScope instanceof GlobalSearchScope ? (GlobalSearchScope)useScope : new EverythingGlobalScope(project);
final Collection<PsiMethod> lambdaCandidates = ApplicationManager.getApplication().runReadAction(new Computable<Collection<PsiMethod>>() {
@Override
public Collection<PsiMethod> compute() {
final String functionalInterfaceName = aClass.getName();
final GlobalSearchScope useClassScope = classScope instanceof GlobalSearchScope ? (GlobalSearchScope)classScope : scope;
return JavaMethodParameterTypesIndex.getInstance().get(functionalInterfaceName, project, useClassScope);
}
});
for (PsiMethod psiMethod : lambdaCandidates) {
for (final PsiReference ref : MethodReferencesSearch.search(psiMethod, scope, false)) {
boolean accepted = ApplicationManager.getApplication().runReadAction(new Computable<Boolean>() {
@Override
public Boolean compute() {
final PsiElement refElement = ref.getElement();
if (refElement != null) {
final PsiElement candidateElement = refElement.getParent();
if (candidateElement instanceof PsiCallExpression) {
final PsiExpressionList argumentList = ((PsiCallExpression)candidateElement).getArgumentList();
if (argumentList != null) {
final PsiExpression[] args = argumentList.getExpressions();
for (PsiExpression arg : args) {
if (arg instanceof PsiFunctionalExpression) {
final PsiFunctionalExpression functionalExpression = (PsiFunctionalExpression)arg;
final PsiType functionalType = functionalExpression.getFunctionalInterfaceType();
if (PsiUtil.resolveClassInType(functionalType) == aClass) {
if (!consumer.process(functionalExpression)) return false;
}
}
}
}
}
}
return true;
}
});
if (!accepted) return false;
}
}
for (final PsiReference reference : ReferencesSearch.search(aClass, scope)) {
boolean accepted = ApplicationManager.getApplication().runReadAction(new Computable<Boolean>() {
@Override
public Boolean compute() {
final PsiElement element = reference.getElement();
if (element != null) {
final PsiElement parent = element.getParent();
if (parent instanceof PsiTypeElement) {
final PsiElement gParent = parent.getParent();
if (gParent instanceof PsiVariable) {
final PsiExpression initializer = PsiUtil.skipParenthesizedExprDown(((PsiVariable)gParent).getInitializer());
if (initializer instanceof PsiFunctionalExpression) {
if (!consumer.process((PsiFunctionalExpression)initializer)) return false;
}
for (PsiReference varRef : ReferencesSearch.search(parent, scope)) {
final PsiElement varElement = varRef.getElement();
if (varElement != null) {
final PsiElement varElementParent = varElement.getParent();
if (varElementParent instanceof PsiAssignmentExpression &&
((PsiAssignmentExpression)varElementParent).getLExpression() == varElement) {
final PsiExpression rExpression = PsiUtil.skipParenthesizedExprDown(((PsiAssignmentExpression)varElementParent).getRExpression());
if (rExpression instanceof PsiFunctionalExpression) {
if (!consumer.process((PsiFunctionalExpression)rExpression)) return false;
}
}
}
}
} else if (gParent instanceof PsiMethod) {
final PsiReturnStatement[] returnStatements = ApplicationManager.getApplication().runReadAction(
new Computable<PsiReturnStatement[]>() {
@Override
public PsiReturnStatement[] compute() {
return PsiUtil.findReturnStatements((PsiMethod)gParent);
}
});
for (PsiReturnStatement returnStatement : returnStatements) {
final PsiExpression returnValue = returnStatement.getReturnValue();
if (returnValue instanceof PsiFunctionalExpression) {
if (!consumer.process((PsiFunctionalExpression)returnValue)) return false;
}
}
}
}
}
return true;
}
});
if (!accepted) return false;
}
return true;
}
}
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