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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.openapi.diagnostic.Logger;
import com.intellij.openapi.util.Comparing;
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 java.util.List;
/**
* User: anna
*/
public class TypeEqualityConstraint implements ConstraintFormula {
private static final Logger LOG = Logger.getInstance("#" + TypeEqualityConstraint.class.getName());
private PsiType myT;
private PsiType myS;
public TypeEqualityConstraint(PsiType t, PsiType s) {
myT = t;
myS = s;
}
@Override
public boolean reduce(InferenceSession session, List<ConstraintFormula> constraints) {
if (myT instanceof PsiWildcardType && myS instanceof PsiWildcardType) {
final PsiType tBound = ((PsiWildcardType)myT).getBound();
final PsiType sBound = ((PsiWildcardType)myS).getBound();
if (tBound == null && sBound == null) return true;
if (sBound == null && ((PsiWildcardType)myT).isExtends()) {
//extends bound of "?" (Object)
constraints.add(new TypeEqualityConstraint(((PsiWildcardType)myS).getExtendsBound(), tBound));
return true;
}
if (tBound == null && ((PsiWildcardType)myS).isExtends()) {
//extends bound of "?" (Object)
constraints.add(new TypeEqualityConstraint(((PsiWildcardType)myT).getExtendsBound(), sBound));
return true;
}
if (((PsiWildcardType)myT).isExtends() && ((PsiWildcardType)myS).isExtends() ||
((PsiWildcardType)myT).isSuper() && ((PsiWildcardType)myS).isSuper()) {
LOG.assertTrue(tBound != null);
LOG.assertTrue(sBound != null);
constraints.add(new TypeEqualityConstraint(tBound, sBound));
return true;
}
}
if (myT instanceof PsiWildcardType || myS instanceof PsiWildcardType) {
return false;
}
if (session.isProperType(myT) && session.isProperType(myS)) {
if (myT == null) return myS == null || myS.equalsToText(CommonClassNames.JAVA_LANG_OBJECT);
if (myS == null) return myT.equalsToText(CommonClassNames.JAVA_LANG_OBJECT);
return Comparing.equal(myT, myS);
}
InferenceVariable inferenceVariable = session.getInferenceVariable(myS);
if (inferenceVariable != null) {
inferenceVariable.addBound(myT, InferenceBound.EQ);
return true;
}
inferenceVariable = session.getInferenceVariable(myT);
if (inferenceVariable != null) {
inferenceVariable.addBound(myS, InferenceBound.EQ);
return true;
}
if (myT instanceof PsiClassType && myS instanceof PsiClassType) {
final PsiClassType.ClassResolveResult tResult = ((PsiClassType)myT).resolveGenerics();
final PsiClassType.ClassResolveResult sResult = ((PsiClassType)myS).resolveGenerics();
final PsiClass tClass = tResult.getElement();
//equal erasure
if (tClass != null && tClass.equals(sResult.getElement())) {
final PsiSubstitutor tSubstitutor = tResult.getSubstitutor();
final PsiSubstitutor sSubstitutor = sResult.getSubstitutor();
for (PsiTypeParameter typeParameter : tClass.getTypeParameters()) {
final PsiType tSubstituted = tSubstitutor.substitute(typeParameter);
final PsiType sSubstituted = sSubstitutor.substitute(typeParameter);
if (tSubstituted != null && sSubstituted != null) {
constraints.add(new TypeEqualityConstraint(tSubstituted, sSubstituted));
}
}
return true;
}
}
if (myT instanceof PsiArrayType && myS instanceof PsiArrayType) {
constraints.add(new TypeEqualityConstraint(((PsiArrayType)myT).getComponentType(), ((PsiArrayType)myS).getComponentType()));
return true;
}
if (myT instanceof PsiCapturedWildcardType && myS instanceof PsiCapturedWildcardType) {
return new TypeEqualityConstraint(((PsiCapturedWildcardType)myT).getWildcard(),
((PsiCapturedWildcardType)myS).getWildcard()).reduce(session, constraints);
}
return false;
}
@Override
public void apply(PsiSubstitutor substitutor) {
myT = substitutor.substitute(myT);
myS = substitutor.substitute(myS);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
TypeEqualityConstraint that = (TypeEqualityConstraint)o;
if (myS instanceof PsiCapturedWildcardType && myS != that.myS) return false;
if (myT instanceof PsiCapturedWildcardType && myT != that.myT) 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 = myT != null ? myT.hashCode() : 0;
result = 31 * result + (myS != null ? myS.hashCode() : 0);
return result;
}
@Override
public String toString() {
return myT.getPresentableText() + " == " + myS.getPresentableText();
}
}
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