| /* |
| * Copyright 2000-2014 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.psi.PsiCapturedWildcardType; |
| import com.intellij.psi.PsiSubstitutor; |
| import com.intellij.psi.PsiType; |
| import com.intellij.psi.PsiWildcardType; |
| import com.intellij.psi.impl.source.resolve.graphInference.InferenceSession; |
| |
| import java.util.List; |
| |
| public class SubtypingConstraint implements ConstraintFormula { |
| private static final Logger LOG = Logger.getInstance("#" + SubtypingConstraint.class.getName()); |
| |
| private PsiType myS; |
| private PsiType myT; |
| |
| public SubtypingConstraint(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 equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| SubtypingConstraint that = (SubtypingConstraint)o; |
| |
| if ( 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); |
| return result; |
| } |
| |
| @Override |
| public boolean reduce(InferenceSession session, List<ConstraintFormula> constraints) { |
| if (myT instanceof PsiWildcardType) { |
| PsiType tBound = ((PsiWildcardType)myT).getBound(); |
| if (tBound == null) { |
| return true; |
| } |
| |
| if (tBound instanceof PsiCapturedWildcardType) { |
| tBound = ((PsiWildcardType)myT).isExtends() ? ((PsiCapturedWildcardType)tBound).getUpperBound() |
| : ((PsiCapturedWildcardType)tBound).getLowerBound(); |
| } |
| if (myS instanceof PsiCapturedWildcardType) { |
| myS = ((PsiCapturedWildcardType)myS).getWildcard(); |
| } |
| |
| if (((PsiWildcardType)myT).isExtends()) { |
| if (myS instanceof PsiWildcardType) { |
| final PsiType sBound = ((PsiWildcardType)myS).getBound(); |
| if (sBound == null) { |
| constraints.add(new StrictSubtypingConstraint(tBound, ((PsiWildcardType)myS).getExtendsBound())); |
| return true; |
| } |
| |
| if (((PsiWildcardType)myS).isExtends()) { |
| constraints.add(new StrictSubtypingConstraint(tBound, sBound)); |
| return true; |
| } |
| |
| if (((PsiWildcardType)myS).isSuper()) { |
| constraints.add(new TypeEqualityConstraint(tBound, PsiType.getJavaLangObject(((PsiWildcardType)myT).getManager(), myT.getResolveScope()))); |
| return true; |
| } |
| |
| assert false; |
| } |
| else { |
| constraints.add(new StrictSubtypingConstraint(tBound, myS)); |
| return true; |
| } |
| } |
| else { |
| LOG.assertTrue(((PsiWildcardType)myT).isSuper()); |
| |
| if (myS instanceof PsiWildcardType) { |
| final PsiType sBound = ((PsiWildcardType)myS).getBound(); |
| if (sBound != null && ((PsiWildcardType)myS).isSuper()) { |
| constraints.add(new StrictSubtypingConstraint(sBound, tBound)); |
| return true; |
| } |
| } else { |
| constraints.add(new StrictSubtypingConstraint(myS, tBound)); |
| return true; |
| } |
| } |
| return false; |
| } else { |
| if (myS instanceof PsiWildcardType) { |
| return false; |
| } else { |
| constraints.add(new TypeEqualityConstraint(myT, myS)); |
| return true; |
| } |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return myS.getPresentableText() + " <= " + myT.getPresentableText(); |
| } |
| } |