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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.symbolsolver.model.declarations.TypeParameterDeclaration;
import com.github.javaparser.symbolsolver.model.typesystem.ReferenceType;
import com.github.javaparser.symbolsolver.model.typesystem.Type;
import com.github.javaparser.symbolsolver.model.typesystem.TypeVariable;
import com.github.javaparser.symbolsolver.model.typesystem.Wildcard;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;
/**
* An element using during type inference.
*
* @author Federico Tomassetti
*/
public class InferenceVariableType implements Type {
@Override
public String toString() {
return "InferenceVariableType{" +
"id=" + id +
'}';
}
private int id;
private TypeParameterDeclaration correspondingTp;
public void setCorrespondingTp(TypeParameterDeclaration correspondingTp) {
this.correspondingTp = correspondingTp;
}
private Set<Type> equivalentTypes = new HashSet<>();
private ObjectProvider objectProvider;
public void registerEquivalentType(Type type) {
this.equivalentTypes.add(type);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof InferenceVariableType)) return false;
InferenceVariableType that = (InferenceVariableType) o;
return id == that.id;
}
@Override
public int hashCode() {
return id;
}
private Set<Type> superTypes = new HashSet<>();
public InferenceVariableType(int id, ObjectProvider objectProvider) {
this.id = id;
this.objectProvider = objectProvider;
}
public static InferenceVariableType fromWildcard(Wildcard wildcard, int id, ObjectProvider objectProvider) {
InferenceVariableType inferenceVariableType = new InferenceVariableType(id, objectProvider);
if (wildcard.isExtends()) {
inferenceVariableType.superTypes.add(wildcard.getBoundedType());
}
if (wildcard.isSuper()) {
// I am not sure about this one...
inferenceVariableType.superTypes.add(wildcard.getBoundedType());
}
return inferenceVariableType;
}
@Override
public String describe() {
return "InferenceVariable_" + id;
}
@Override
public boolean isAssignableBy(Type other) {
throw new UnsupportedOperationException();
}
private Set<Type> concreteEquivalentTypesAlsoIndirectly(Set<InferenceVariableType> considered, InferenceVariableType inferenceVariableType) {
considered.add(inferenceVariableType);
Set<Type> result = new HashSet<>();
result.addAll(inferenceVariableType.equivalentTypes.stream().filter(t -> !t.isTypeVariable() && !(t instanceof InferenceVariableType)).collect(Collectors.toSet()));
inferenceVariableType.equivalentTypes.stream().filter(t -> t instanceof InferenceVariableType).forEach(t -> {
InferenceVariableType ivt = (InferenceVariableType)t;
if (!considered.contains(ivt)) {
result.addAll(concreteEquivalentTypesAlsoIndirectly(considered, ivt));
}
});
return result;
}
public Type equivalentType() {
Set<Type> concreteEquivalent = concreteEquivalentTypesAlsoIndirectly(new HashSet<>(), this);
if (concreteEquivalent.isEmpty()) {
if (correspondingTp == null) {
return objectProvider.object();
} else {
return new TypeVariable(correspondingTp);
}
}
if (concreteEquivalent.size() == 1) {
return concreteEquivalent.iterator().next();
}
Set<Type> notTypeVariables = equivalentTypes.stream()
.filter(t -> !t.isTypeVariable() && !hasInferenceVariables(t))
.collect(Collectors.toSet());
if (notTypeVariables.size() == 1) {
return notTypeVariables.iterator().next();
} else if (notTypeVariables.size() == 0 && !superTypes.isEmpty()) {
if (superTypes.size() == 1) {
return superTypes.iterator().next();
} else {
throw new IllegalStateException("Super types are: " + superTypes);
}
} else {
throw new IllegalStateException("Equivalent types are: " + equivalentTypes);
}
}
private boolean hasInferenceVariables(Type type){
if (type instanceof InferenceVariableType){
return true;
}
if (type.isReferenceType()){
ReferenceType refType = type.asReferenceType();
for (Type t : refType.typeParametersValues()){
if (hasInferenceVariables(t)){
return true;
}
}
return false;
}
if (type.isWildcard()){
Wildcard wildcardType = type.asWildcard();
return hasInferenceVariables(wildcardType.getBoundedType());
}
return false;
}
}
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