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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.InferenceSession;
import com.intellij.psi.util.PsiUtil;
import com.intellij.psi.util.TypeConversionUtil;
import org.jetbrains.annotations.NotNull;
import java.util.List;
/**
* User: anna
*/
public class TypeCompatibilityConstraint implements ConstraintFormula {
private PsiType myT;
private PsiType myS;
public TypeCompatibilityConstraint(@NotNull PsiType t, @NotNull PsiType s) {
myT = t;
myS = s;
}
@Override
public boolean reduce(InferenceSession session, List<ConstraintFormula> constraints) {
if (session.isProperType(myT) && session.isProperType(myS)) {
return TypeConversionUtil.isAssignable(myT, myS);
}
if (myS instanceof PsiPrimitiveType) {
final PsiClassType boxedType = ((PsiPrimitiveType)myS).getBoxedType(session.getManager(), session.getScope());
if (boxedType != null) {
constraints.add(new TypeCompatibilityConstraint(myT, boxedType));
return true;
}
}
if (myT instanceof PsiPrimitiveType) {
final PsiClassType boxedType = ((PsiPrimitiveType)myT).getBoxedType(session.getManager(), session.getScope());
if (boxedType != null) {
constraints.add(new TypeEqualityConstraint(boxedType, myS));
return true;
}
}
if (isUncheckedConversion(myT, myS)) {
session.setErased();
return true;
}
constraints.add(new StrictSubtypingConstraint(myT, myS));
return true;
}
public static boolean isUncheckedConversion(final PsiType t, final PsiType s) {
if (t instanceof PsiClassType && !((PsiClassType)t).isRaw() && s instanceof PsiClassType) {
final PsiClassType.ClassResolveResult tResult = ((PsiClassType)t).resolveGenerics();
final PsiClassType.ClassResolveResult sResult = ((PsiClassType)s).resolveGenerics();
final PsiClass tClass = tResult.getElement();
final PsiClass sClass = sResult.getElement();
if (tClass != null && sClass != null) {
final PsiSubstitutor sSubstitutor = TypeConversionUtil.getClassSubstitutor(tClass, sClass, sResult.getSubstitutor());
if (sSubstitutor != null && PsiUtil.isRawSubstitutor(tClass, sSubstitutor)) {
return true;
}
}
}
else if (t instanceof PsiArrayType && t.getArrayDimensions() == s.getArrayDimensions()) {
return isUncheckedConversion(t.getDeepComponentType(), s.getDeepComponentType());
}
return false;
}
@Override
public void apply(PsiSubstitutor substitutor, boolean cache) {
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;
TypeCompatibilityConstraint that = (TypeCompatibilityConstraint)o;
if (!myS.equals(that.myS)) return false;
if (!myT.equals(that.myT)) return false;
return true;
}
@Override
public int hashCode() {
int result = myT.hashCode();
result = 31 * result + myS.hashCode();
return result;
}
@Override
public String toString() {
return myS.getPresentableText() + " -> " + myT.getPresentableText();
}
}
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