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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;
import com.intellij.pom.java.LanguageLevel;
import com.intellij.psi.*;
import com.intellij.psi.impl.source.resolve.ParameterTypeInferencePolicy;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* User: anna
*/
public class PsiGraphInferenceHelper implements PsiInferenceHelper {
private final PsiManager myManager;
public PsiGraphInferenceHelper(PsiManager manager) {
myManager = manager;
}
@Override
public PsiType inferTypeForMethodTypeParameter(@NotNull PsiTypeParameter typeParameter,
@NotNull PsiParameter[] parameters,
@NotNull PsiExpression[] arguments,
@NotNull PsiSubstitutor partialSubstitutor,
@Nullable PsiElement parent,
@NotNull ParameterTypeInferencePolicy policy) {
final InferenceSession inferenceSession = new InferenceSession(new PsiTypeParameter[]{typeParameter}, partialSubstitutor, myManager, parent);
inferenceSession.initExpressionConstraints(parameters, arguments, parent, null);
return inferenceSession.infer(parameters, arguments, parent).substitute(typeParameter);
}
@NotNull
@Override
public PsiSubstitutor inferTypeArguments(@NotNull PsiTypeParameter[] typeParameters,
@NotNull PsiParameter[] parameters,
@NotNull PsiExpression[] arguments,
@NotNull PsiSubstitutor partialSubstitutor,
@NotNull PsiElement parent,
@NotNull ParameterTypeInferencePolicy policy,
@NotNull LanguageLevel languageLevel) {
if (typeParameters.length == 0) return partialSubstitutor;
final InferenceSession inferenceSession = new InferenceSession(typeParameters, partialSubstitutor, myManager, parent);
inferenceSession.initExpressionConstraints(parameters, arguments, parent, null);
return inferenceSession.infer(parameters, arguments, parent);
}
@NotNull
@Override
public PsiSubstitutor inferTypeArguments(@NotNull PsiTypeParameter[] typeParameters,
@NotNull PsiType[] leftTypes,
@NotNull PsiType[] rightTypes,
@NotNull LanguageLevel languageLevel) {
if (typeParameters.length == 0) return PsiSubstitutor.EMPTY;
InferenceSession session = new InferenceSession(typeParameters, leftTypes, rightTypes, PsiSubstitutor.EMPTY, myManager, null);
for (PsiType leftType : leftTypes) {
if (!session.isProperType(session.substituteWithInferenceVariables(leftType))) {
return session.infer();
}
}
for (PsiType rightType : rightTypes) {
if (!session.isProperType(session.substituteWithInferenceVariables(rightType))) {
return session.infer();
}
}
return PsiSubstitutor.EMPTY;
}
@Override
public PsiType getSubstitutionForTypeParameter(PsiTypeParameter typeParam,
PsiType param,
PsiType arg,
boolean isContraVariantPosition,
LanguageLevel languageLevel) {
if (arg == PsiType.VOID || param == PsiType.VOID) return PsiType.NULL;
if (param instanceof PsiArrayType && arg instanceof PsiArrayType) {
return getSubstitutionForTypeParameter(typeParam, ((PsiArrayType)param).getComponentType(), ((PsiArrayType)arg).getComponentType(), isContraVariantPosition, languageLevel);
}
if (!(param instanceof PsiClassType)) return PsiType.NULL;
if (arg == null) {
return PsiType.NULL;
}
final PsiType[] leftTypes;
final PsiType[] rightTypes;
if (isContraVariantPosition) {
leftTypes = new PsiType[] {param};
rightTypes = new PsiType[]{arg};
}
else {
leftTypes = new PsiType[] {arg};
rightTypes = new PsiType[]{param};
}
final InferenceSession inferenceSession = new InferenceSession(new PsiTypeParameter[]{typeParam}, leftTypes, rightTypes, PsiSubstitutor.EMPTY, myManager, null);
if (inferenceSession.isProperType(inferenceSession.substituteWithInferenceVariables(param)) &&
inferenceSession.isProperType(inferenceSession.substituteWithInferenceVariables(arg))) {
boolean proceed = false;
for (PsiClassType classType : typeParam.getExtendsListTypes()) {
if (!inferenceSession.isProperType(inferenceSession.substituteWithInferenceVariables(classType))) {
proceed = true;
break;
}
}
if (!proceed) {
return PsiType.NULL;
}
}
final PsiSubstitutor substitutor = inferenceSession.infer();
return substitutor.substitute(typeParam);
}
}
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