| /* |
| * 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.InheritanceUtil; |
| import com.intellij.psi.util.TypeConversionUtil; |
| |
| import java.util.List; |
| |
| /** |
| * User: anna |
| */ |
| public class StrictSubtypingConstraint implements ConstraintFormula { |
| private PsiType myS; |
| private PsiType myT; |
| |
| public StrictSubtypingConstraint(PsiType t, PsiType s) { |
| myT = t; |
| myS = s; |
| } |
| |
| @Override |
| public void apply(PsiSubstitutor substitutor, boolean cache) { |
| myT = substitutor.substitute(myT); |
| myS = substitutor.substitute(myS); |
| } |
| |
| |
| @Override |
| public boolean reduce(InferenceSession session, List<ConstraintFormula> constraints) { |
| if (session.isProperType(myS) && session.isProperType(myT)) { |
| if (myT == null) return myS == null || myS.equalsToText(CommonClassNames.JAVA_LANG_OBJECT); |
| if (myS == null) return true; |
| return TypeConversionUtil.isAssignable(myT, myS); |
| } |
| |
| if (PsiType.NULL.equals(myT) || myT == null) return false; |
| if (PsiType.NULL.equals(myS) || myS == null || myT.equalsToText(CommonClassNames.JAVA_LANG_OBJECT)) return true; |
| |
| InferenceVariable inferenceVariable = session.getInferenceVariable(myS); |
| if (inferenceVariable != null) { |
| inferenceVariable.addBound(myT, InferenceBound.UPPER); |
| 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 StrictSubtypingConstraint(tComponentType, sComponentType)); |
| 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; |
| } |
| } |
| final PsiType lowerBound = CClass.getUserData(InferenceSession.LOWER_BOUND); |
| if (lowerBound != null) { |
| constraints.add(new StrictSubtypingConstraint(lowerBound, myS)); |
| return true; |
| } |
| return false; |
| } |
| |
| PsiClassType.ClassResolveResult SResult = null; |
| if (myS instanceof PsiIntersectionType) { |
| for (PsiType conjunct : ((PsiIntersectionType)myS).getConjuncts()) { |
| if (conjunct instanceof PsiClassType) { |
| final PsiClassType.ClassResolveResult conjunctResult = ((PsiClassType)conjunct).resolveGenerics(); |
| if (InheritanceUtil.isInheritorOrSelf(conjunctResult.getElement(), CClass, true)) { |
| SResult = conjunctResult; |
| break; |
| } |
| } |
| } |
| } else if (myS instanceof PsiClassType) { |
| SResult = ((PsiClassType)myS).resolveGenerics(); |
| } |
| |
| if (SResult == null) return false; |
| PsiClass SClass = SResult.getElement(); |
| if (((PsiClassType)myT).isRaw()) { |
| return SClass != null && InheritanceUtil.isInheritorOrSelf(SClass, CClass, true); |
| } |
| 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)); |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| if (myT instanceof PsiIntersectionType) { |
| for (PsiType conjunct : ((PsiIntersectionType)myT).getConjuncts()) { |
| constraints.add(new StrictSubtypingConstraint(conjunct, myS)); |
| } |
| return true; |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| StrictSubtypingConstraint that = (StrictSubtypingConstraint)o; |
| |
| 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); |
| return result; |
| } |
| |
| @Override |
| public String toString() { |
| return myS.getPresentableText() + " < " + myT.getPresentableText(); |
| } |
| } |