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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.psi.*;
import com.intellij.psi.impl.source.resolve.graphInference.InferenceBound;
import com.intellij.psi.impl.source.resolve.graphInference.InferenceSession;
import com.intellij.psi.impl.source.resolve.graphInference.InferenceVariable;
import com.intellij.psi.util.TypeConversionUtil;
import java.util.List;
/**
* User: anna
*/
public class SubtypingConstraint implements ConstraintFormula {
private PsiType myS;
private PsiType myT;
private boolean myIsRefTypes;
public SubtypingConstraint(PsiType t, PsiType s, boolean isRefTypes) {
myT = t;
myS = s;
myIsRefTypes = isRefTypes;
}
@Override
public boolean reduce(InferenceSession session, List<ConstraintFormula> constraints) {
if (myIsRefTypes) {
if (session.isProperType(myS) && session.isProperType(myT)) {
if (myT == null || myS == null) return myS == myT;
return TypeConversionUtil.isAssignable(myT, myS);
}
InferenceVariable inferenceVariable = session.getInferenceVariable(myS);
if (inferenceVariable != null) {
inferenceVariable.addBound(myT, InferenceBound.UPPER);
return true;
}
if (PsiType.NULL.equals(myS)) return true;
inferenceVariable = session.getInferenceVariable(myT);
if (inferenceVariable != null) {
inferenceVariable.addBound(myS, InferenceBound.LOWER);
return true;
}
if (myT instanceof PsiArrayType) {
if (!(myS instanceof PsiArrayType)) return false; //todo most specific array supertype
final PsiType tComponentType = ((PsiArrayType)myT).getComponentType();
final PsiType sComponentType = ((PsiArrayType)myS).getComponentType();
if (!(tComponentType instanceof PsiPrimitiveType) && !(sComponentType instanceof PsiPrimitiveType)) {
constraints.add(new SubtypingConstraint(tComponentType, sComponentType, true));
return true;
}
return sComponentType instanceof PsiPrimitiveType && sComponentType.equals(tComponentType);
}
if (myT instanceof PsiClassType) {
final PsiClassType.ClassResolveResult TResult = ((PsiClassType)myT).resolveGenerics();
final PsiClass CClass = TResult.getElement();
if (CClass != null) {
if (CClass instanceof PsiTypeParameter) {
if (myS instanceof PsiIntersectionType) {
for (PsiType conjunct : ((PsiIntersectionType)myS).getConjuncts()) {
if (myT.equals(conjunct)) return true;
}
}
//todo ((PsiTypeParameter)C).getLowerBound()
return false;
}
if (!(myS instanceof PsiClassType)) return false;
PsiClassType.ClassResolveResult SResult = ((PsiClassType)myS).resolveGenerics();
PsiClass SClass = SResult.getElement();
final PsiSubstitutor tSubstitutor = TResult.getSubstitutor();
final PsiSubstitutor sSubstitutor = SClass != null ? TypeConversionUtil.getClassSubstitutor(CClass, SClass, SResult.getSubstitutor()) : null;
if (sSubstitutor != null) {
for (PsiTypeParameter parameter : CClass.getTypeParameters()) {
final PsiType tSubstituted = tSubstitutor.substitute(parameter);
final PsiType sSubstituted = sSubstitutor.substituteWithBoundsPromotion(parameter);
constraints.add(new SubtypingConstraint(tSubstituted, sSubstituted, false));
}
return true;
}
}
return false;
}
if (myT instanceof PsiIntersectionType) {
for (PsiType conjunct : ((PsiIntersectionType)myT).getConjuncts()) {
constraints.add(new SubtypingConstraint(conjunct, myS, true));
}
return true;
}
if (PsiType.NULL.equals(myT)) return false;
} else {
if (myT instanceof PsiWildcardType) {
final PsiType tBound = ((PsiWildcardType)myT).getBound();
if (tBound == null) {
return true;
}
if (((PsiWildcardType)myT).isExtends()) {
if (tBound.equalsToText(CommonClassNames.JAVA_LANG_OBJECT)) {
return true;
}
if (myS instanceof PsiWildcardType) {
final PsiType sBound = ((PsiWildcardType)myS).getBound();
if (sBound != null && ((PsiWildcardType)myS).isExtends()) {
constraints.add(new SubtypingConstraint(tBound, sBound, true));
return true;
}
} else {
constraints.add(new SubtypingConstraint(tBound, myS, true));
return true;
}
return false;
} else {
if (myS instanceof PsiCapturedWildcardType) {
myS = ((PsiCapturedWildcardType)myS).getWildcard();
}
if (myS instanceof PsiWildcardType) {
final PsiType sBound = ((PsiWildcardType)myS).getBound();
if (sBound != null && ((PsiWildcardType)myS).isSuper()) {
constraints.add(new SubtypingConstraint(sBound, tBound, true));
return true;
}
} else {
constraints.add(new SubtypingConstraint(myS, tBound, true));
return true;
}
}
return false;
} else {
InferenceVariable inferenceVariable = session.getInferenceVariable(myT);
if (myS instanceof PsiWildcardType) {
return inferenceVariable != null && inferenceVariable.isCaptured();
} else {
if (inferenceVariable != null) {
inferenceVariable.addBound(myS, InferenceBound.EQ);
return true;
}
inferenceVariable = session.getInferenceVariable(myS);
if (inferenceVariable != null) {
inferenceVariable.addBound(myT, InferenceBound.EQ);
return true;
}
constraints.add(new SubtypingConstraint(myT, myS, true));
return true;
}
}
}
return true;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
SubtypingConstraint that = (SubtypingConstraint)o;
if (myIsRefTypes != that.myIsRefTypes) return false;
if (!myIsRefTypes && myS instanceof PsiCapturedWildcardType && myS != that.myS) return false;
if (myS != null ? !myS.equals(that.myS) : that.myS != null) return false;
if (myT != null ? !myT.equals(that.myT) : that.myT != null) return false;
return true;
}
@Override
public int hashCode() {
int result = myS != null ? myS.hashCode() : 0;
result = 31 * result + (myT != null ? myT.hashCode() : 0);
result = 31 * result + (myIsRefTypes ? 1 : 0);
return result;
}
}
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