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/*
* Copyright 2000-2013 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.source.resolve.graphInference.constraints;
import com.intellij.codeInsight.ExceptionUtil;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.psi.*;
import com.intellij.psi.impl.source.resolve.graphInference.InferenceSession;
import com.intellij.psi.impl.source.resolve.graphInference.InferenceVariable;
import com.intellij.psi.impl.source.resolve.graphInference.PsiPolyExpressionUtil;
import com.intellij.psi.util.PsiUtil;
import com.intellij.psi.util.TypeConversionUtil;
import com.intellij.util.Function;
import com.intellij.util.containers.ContainerUtil;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
/**
* User: anna
*/
public class CheckedExceptionCompatibilityConstraint extends InputOutputConstraintFormula {
private static final Logger LOG = Logger.getInstance("#" + CheckedExceptionCompatibilityConstraint.class.getName());
private final PsiExpression myExpression;
private PsiType myT;
public CheckedExceptionCompatibilityConstraint(PsiExpression expression, PsiType t) {
myExpression = expression;
myT = t;
}
@Override
public boolean reduce(InferenceSession session, List<ConstraintFormula> constraints) {
if (!PsiPolyExpressionUtil.isPolyExpression(myExpression)) {
return true;
}
if (myExpression instanceof PsiCallExpression) {
final PsiExpressionList argumentList = ((PsiCallExpression)myExpression).getArgumentList();
if (argumentList != null) {
for (PsiExpression expression : argumentList.getExpressions()) {
if (PsiPolyExpressionUtil.isPolyExpression(expression)) {
//todo additional constraints [JDK-8033488]
}
}
}
return true;
}
if (myExpression instanceof PsiParenthesizedExpression) {
constraints.add(new CheckedExceptionCompatibilityConstraint(((PsiParenthesizedExpression)myExpression).getExpression(), myT));
return true;
}
if (myExpression instanceof PsiConditionalExpression) {
final PsiExpression thenExpression = ((PsiConditionalExpression)myExpression).getThenExpression();
if (thenExpression != null) {
constraints.add(new CheckedExceptionCompatibilityConstraint(thenExpression, myT));
}
final PsiExpression elseExpression = ((PsiConditionalExpression)myExpression).getElseExpression();
if (elseExpression != null) {
constraints.add(new CheckedExceptionCompatibilityConstraint(elseExpression, myT));
}
return true;
}
if (myExpression instanceof PsiLambdaExpression || myExpression instanceof PsiMethodReferenceExpression) {
if (!LambdaUtil.isFunctionalType(myT)) {
return false;
}
final PsiMethod interfaceMethod = LambdaUtil.getFunctionalInterfaceMethod(myT);
if (interfaceMethod == null) {
return false;
}
final PsiSubstitutor substitutor = LambdaUtil.getSubstitutor(interfaceMethod, PsiUtil.resolveGenericsClassInType(myT));
if (myExpression instanceof PsiLambdaExpression && !((PsiLambdaExpression)myExpression).hasFormalParameterTypes() ||
myExpression instanceof PsiMethodReferenceExpression && !((PsiMethodReferenceExpression)myExpression).isExact()) {
for (PsiParameter parameter : interfaceMethod.getParameterList().getParameters()) {
if (!session.isProperType(substitutor.substitute(parameter.getType()))) return false;
}
}
final PsiType returnType = interfaceMethod.getReturnType();
if (myExpression instanceof PsiLambdaExpression || !((PsiMethodReferenceExpression)myExpression).isExact()) {
if (!session.isProperType(substitutor.substitute(returnType))) return false;
}
final List<PsiType>
expectedThrownTypes = ContainerUtil.map(interfaceMethod.getThrowsList().getReferencedTypes(), new Function<PsiType, PsiType>() {
@Override
public PsiType fun(PsiType type) {
return substitutor.substitute(type);
}
});
final List<PsiType> expectedNonProperThrownTypes = new ArrayList<PsiType>();
for (PsiType type : expectedThrownTypes) {
if (!session.isProperType(type)) {
expectedNonProperThrownTypes.add(type);
}
}
final List<PsiType> thrownTypes = new ArrayList<PsiType>();
if (myExpression instanceof PsiLambdaExpression) {
PsiElement body = ((PsiLambdaExpression)myExpression).getBody();
if (body != null) {
thrownTypes.addAll(ExceptionUtil.getUnhandledExceptions(body));
}
} else {
final PsiMethodReferenceUtil.QualifierResolveResult qualifierResolveResult = PsiMethodReferenceUtil.getQualifierResolveResult((PsiMethodReferenceExpression)myExpression);
final PsiSubstitutor psiSubstitutor = qualifierResolveResult.getSubstitutor();
final PsiMethod method;
if (((PsiMethodReferenceExpression)myExpression).isExact()) {
final PsiElement resolve = ((PsiMethodReferenceExpression)myExpression).resolve();
if (resolve instanceof PsiMethod) {
method = (PsiMethod)resolve;
} else {
method = null;
}
}
else {
method = interfaceMethod;
}
if (method != null) {
for (PsiType type : method.getThrowsList().getReferencedTypes()) {
type = psiSubstitutor.substitute(type);
if (type instanceof PsiClassType && !ExceptionUtil.isUncheckedException((PsiClassType)type)) {
thrownTypes.add(type);
}
}
}
}
if (expectedNonProperThrownTypes.isEmpty()) {
for (PsiType thrownType : thrownTypes) {
if (!isAddressed(expectedThrownTypes, thrownType)) return false;
}
} else {
final ArrayList<PsiType> expectedProperTypes = new ArrayList<PsiType>(expectedThrownTypes);
expectedProperTypes.retainAll(expectedNonProperThrownTypes);
for (PsiType thrownType : thrownTypes) {
if (!isAddressed(expectedProperTypes, thrownType)) {
for (PsiType expectedNonProperThrownType : expectedNonProperThrownTypes) {
constraints.add(new StrictSubtypingConstraint(expectedNonProperThrownType, thrownType));
}
}
}
for (PsiType expectedNonProperThrownType : expectedNonProperThrownTypes) {
final InferenceVariable variable = session.getInferenceVariable(expectedNonProperThrownType);
LOG.assertTrue(variable != null);
variable.setThrownBound();
}
}
}
return true;
}
private static boolean isAddressed(List<PsiType> expectedThrownTypes, PsiType thrownType) {
for (PsiType expectedThrownType : expectedThrownTypes) {
if (TypeConversionUtil.isAssignable(expectedThrownType, thrownType)) {
return true;
}
}
return false;
}
@Override
protected PsiExpression getExpression() {
return myExpression;
}
@Override
protected PsiType getT() {
return myT;
}
@Override
protected void setT(PsiType t) {
myT = t;
}
@Override
protected InputOutputConstraintFormula createSelfConstraint(PsiType type, PsiExpression expression) {
return new CheckedExceptionCompatibilityConstraint(expression, type);
}
@Override
protected void collectReturnTypeVariables(InferenceSession session,
PsiExpression psiExpression,
PsiType returnType,
Set<InferenceVariable> result) {
session.collectDependencies(returnType, result);
}
}
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