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/*
* Copyright 2016 Federico Tomassetti
*
* 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.github.javaparser.symbolsolver.logic;
import com.github.javaparser.resolution.declarations.ResolvedTypeParameterDeclaration;
import com.github.javaparser.resolution.types.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
/**
* @author Federico Tomassetti
*/
public class InferenceContext {
private int nextInferenceVariableId = 0;
private ObjectProvider objectProvider;
private List<InferenceVariableType> inferenceVariableTypes = new ArrayList<>();
private Map<String, InferenceVariableType> inferenceVariableTypeMap = new HashMap<>();
public InferenceContext(ObjectProvider objectProvider) {
this.objectProvider = objectProvider;
}
private InferenceVariableType inferenceVariableTypeForTp(ResolvedTypeParameterDeclaration tp) {
if (!inferenceVariableTypeMap.containsKey(tp.getName())) {
InferenceVariableType inferenceVariableType = new InferenceVariableType(nextInferenceVariableId++, objectProvider);
inferenceVariableTypes.add(inferenceVariableType);
inferenceVariableType.setCorrespondingTp(tp);
inferenceVariableTypeMap.put(tp.getName(), inferenceVariableType);
}
return inferenceVariableTypeMap.get(tp.getName());
}
/**
* @return the actual with the inference variable inserted
*/
public ResolvedType addPair(ResolvedType target, ResolvedType actual) {
target = placeInferenceVariables(target);
actual = placeInferenceVariables(actual);
registerCorrespondance(target, actual);
return target;
}
public ResolvedType addSingle(ResolvedType actual) {
return placeInferenceVariables(actual);
}
private void registerCorrespondance(ResolvedType formalType, ResolvedType actualType) {
if (formalType.isReferenceType() && actualType.isReferenceType()) {
ResolvedReferenceType formalTypeAsReference = formalType.asReferenceType();
ResolvedReferenceType actualTypeAsReference = actualType.asReferenceType();
if (!formalTypeAsReference.getQualifiedName().equals(actualTypeAsReference.getQualifiedName())) {
List<ResolvedReferenceType> ancestors = actualTypeAsReference.getAllAncestors();
final String formalParamTypeQName = formalTypeAsReference.getQualifiedName();
List<ResolvedType> correspondingFormalType = ancestors.stream().filter((a) -> a.getQualifiedName().equals(formalParamTypeQName)).collect(Collectors.toList());
if (correspondingFormalType.isEmpty()) {
ancestors = formalTypeAsReference.getAllAncestors();
final String actualParamTypeQname = actualTypeAsReference.getQualifiedName();
List<ResolvedType> correspondingActualType = ancestors.stream().filter(a -> a.getQualifiedName().equals(actualParamTypeQname)).collect(Collectors.toList());
if (correspondingActualType.isEmpty()) {
throw new ConfilictingGenericTypesException(formalType, actualType);
}
correspondingFormalType = correspondingActualType;
}
actualTypeAsReference = correspondingFormalType.get(0).asReferenceType();
}
if (formalTypeAsReference.getQualifiedName().equals(actualTypeAsReference.getQualifiedName())) {
if (!formalTypeAsReference.typeParametersValues().isEmpty()) {
if (actualTypeAsReference.isRawType()) {
// nothing to do
} else {
int i = 0;
for (ResolvedType formalTypeParameter : formalTypeAsReference.typeParametersValues()) {
registerCorrespondance(formalTypeParameter, actualTypeAsReference.typeParametersValues().get(i));
i++;
}
}
}
}
} else if (formalType instanceof InferenceVariableType && !actualType.isPrimitive()) {
((InferenceVariableType) formalType).registerEquivalentType(actualType);
if (actualType instanceof InferenceVariableType) {
((InferenceVariableType) actualType).registerEquivalentType(formalType);
}
} else if (actualType.isNull()) {
// nothing to do
} else if (actualType.equals(formalType)) {
// nothing to do
} else if (actualType.isArray() && formalType.isArray()) {
registerCorrespondance(formalType.asArrayType().getComponentType(), actualType.asArrayType().getComponentType());
} else if (formalType.isWildcard()) {
// nothing to do
if ((actualType instanceof InferenceVariableType) && formalType.asWildcard().isBounded()) {
((InferenceVariableType) actualType).registerEquivalentType(formalType.asWildcard().getBoundedType());
if (formalType.asWildcard().getBoundedType() instanceof InferenceVariableType) {
((InferenceVariableType) formalType.asWildcard().getBoundedType()).registerEquivalentType(actualType);
}
}
if (actualType.isWildcard()) {
ResolvedWildcard formalWildcard = formalType.asWildcard();
ResolvedWildcard actualWildcard = actualType.asWildcard();
if (formalWildcard.isBounded() && formalWildcard.getBoundedType() instanceof InferenceVariableType) {
if (formalWildcard.isSuper() && actualWildcard.isSuper()) {
((InferenceVariableType) formalType.asWildcard().getBoundedType()).registerEquivalentType(actualWildcard.getBoundedType());
} else if (formalWildcard.isExtends() && actualWildcard.isExtends()) {
((InferenceVariableType) formalType.asWildcard().getBoundedType()).registerEquivalentType(actualWildcard.getBoundedType());
}
}
}
if (actualType.isReferenceType()) {
if (formalType.asWildcard().isBounded()) {
registerCorrespondance(formalType.asWildcard().getBoundedType(), actualType);
}
}
} else if (actualType instanceof InferenceVariableType) {
if (formalType instanceof ResolvedReferenceType) {
((InferenceVariableType) actualType).registerEquivalentType(formalType);
} else if (formalType instanceof InferenceVariableType) {
((InferenceVariableType) actualType).registerEquivalentType(formalType);
}
} else if (actualType.isConstraint()) {
ResolvedLambdaConstraintType constraintType = actualType.asConstraintType();
if (constraintType.getBound() instanceof InferenceVariableType) {
((InferenceVariableType) constraintType.getBound()).registerEquivalentType(formalType);
}
} else if (actualType.isPrimitive()) {
if (formalType.isPrimitive()) {
// nothing to do
} else {
registerCorrespondance(formalType, objectProvider.byName(actualType.asPrimitive().getBoxTypeQName()));
}
} else if (actualType.isReferenceType()) {
if (formalType.isPrimitive()) {
if (formalType.asPrimitive().getBoxTypeQName().equals(actualType.describe())) {
registerCorrespondance(objectProvider.byName(formalType.asPrimitive().getBoxTypeQName()), actualType);
} else {
// nothing to do
}
} else {
// nothing to do
}
} else {
throw new UnsupportedOperationException(formalType.describe() + " " + actualType.describe());
}
}
private ResolvedType placeInferenceVariables(ResolvedType type) {
if (type.isWildcard()) {
if (type.asWildcard().isExtends()) {
return ResolvedWildcard.extendsBound(placeInferenceVariables(type.asWildcard().getBoundedType()));
} else if (type.asWildcard().isSuper()) {
return ResolvedWildcard.superBound(placeInferenceVariables(type.asWildcard().getBoundedType()));
} else {
return type;
}
} else if (type.isTypeVariable()) {
return inferenceVariableTypeForTp(type.asTypeParameter());
} else if (type.isReferenceType()) {
return type.asReferenceType().transformTypeParameters(tp -> placeInferenceVariables(tp));
} else if (type.isArray()) {
return new ResolvedArrayType(placeInferenceVariables(type.asArrayType().getComponentType()));
} else if (type.isNull() || type.isPrimitive() || type.isVoid()) {
return type;
} else if (type.isConstraint()) {
return ResolvedLambdaConstraintType.bound(placeInferenceVariables(type.asConstraintType().getBound()));
} else if (type instanceof InferenceVariableType) {
return type;
} else {
throw new UnsupportedOperationException(type.describe());
}
}
public ResolvedType resolve(ResolvedType type) {
if (type instanceof InferenceVariableType) {
InferenceVariableType inferenceVariableType = (InferenceVariableType) type;
return inferenceVariableType.equivalentType();
} else if (type.isReferenceType()) {
return type.asReferenceType().transformTypeParameters(tp -> resolve(tp));
} else if (type.isNull() || type.isPrimitive() || type.isVoid()) {
return type;
} else if (type.isArray()) {
return new ResolvedArrayType(resolve(type.asArrayType().getComponentType()));
} else if (type.isWildcard()) {
if (type.asWildcard().isExtends()) {
return ResolvedWildcard.extendsBound(resolve(type.asWildcard().getBoundedType()));
} else if (type.asWildcard().isSuper()) {
return ResolvedWildcard.superBound(resolve(type.asWildcard().getBoundedType()));
} else {
return type;
}
} else {
throw new UnsupportedOperationException(type.describe());
}
}
}
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