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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.model.typesystem;
import com.github.javaparser.resolution.MethodUsage;
import com.github.javaparser.resolution.declarations.ResolvedMethodDeclaration;
import com.github.javaparser.resolution.declarations.ResolvedReferenceTypeDeclaration;
import com.github.javaparser.resolution.declarations.ResolvedTypeParameterDeclaration;
import com.github.javaparser.resolution.types.ResolvedReferenceType;
import com.github.javaparser.resolution.types.ResolvedType;
import com.github.javaparser.resolution.types.ResolvedTypeTransformer;
import com.github.javaparser.resolution.types.ResolvedTypeVariable;
import com.github.javaparser.resolution.types.parametrization.ResolvedTypeParametersMap;
import com.github.javaparser.symbolsolver.javaparsermodel.LambdaArgumentTypePlaceholder;
import com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserTypeVariableDeclaration;
import com.github.javaparser.symbolsolver.model.resolution.SymbolReference;
import com.github.javaparser.symbolsolver.model.resolution.TypeSolver;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
/**
* @author Federico Tomassetti
*/
// TODO Remove references to typeSolver: it is needed to instantiate other instances of ReferenceTypeUsage
// and to get the Object type declaration
public class ReferenceTypeImpl extends ResolvedReferenceType {
private TypeSolver typeSolver;
public static ResolvedReferenceType undeterminedParameters(ResolvedReferenceTypeDeclaration typeDeclaration, TypeSolver typeSolver) {
return new ReferenceTypeImpl(typeDeclaration, typeDeclaration.getTypeParameters().stream().map(
ResolvedTypeVariable::new
).collect(Collectors.toList()), typeSolver);
}
@Override
protected ResolvedReferenceType create(ResolvedReferenceTypeDeclaration typeDeclaration, List<ResolvedType> typeParametersCorrected) {
return new ReferenceTypeImpl(typeDeclaration, typeParametersCorrected, typeSolver);
}
@Override
protected ResolvedReferenceType create(ResolvedReferenceTypeDeclaration typeDeclaration) {
return new ReferenceTypeImpl(typeDeclaration, typeSolver);
}
public ReferenceTypeImpl(ResolvedReferenceTypeDeclaration typeDeclaration, TypeSolver typeSolver) {
super(typeDeclaration);
this.typeSolver = typeSolver;
}
public ReferenceTypeImpl(ResolvedReferenceTypeDeclaration typeDeclaration, List<ResolvedType> typeArguments, TypeSolver typeSolver) {
super(typeDeclaration, typeArguments);
this.typeSolver = typeSolver;
}
@Override
public ResolvedTypeParameterDeclaration asTypeParameter() {
if (this.typeDeclaration instanceof JavaParserTypeVariableDeclaration) {
JavaParserTypeVariableDeclaration javaParserTypeVariableDeclaration = (JavaParserTypeVariableDeclaration) this.typeDeclaration;
return javaParserTypeVariableDeclaration.asTypeParameter();
}
throw new UnsupportedOperationException(this.typeDeclaration.getClass().getCanonicalName());
}
/**
* This method checks if ThisType t = new OtherType() would compile.
*/
@Override
public boolean isAssignableBy(ResolvedType other) {
if (other instanceof NullType) {
return !this.isPrimitive();
}
// everything is assignable to Object except void
if (!other.isVoid() && this.getQualifiedName().equals(Object.class.getCanonicalName())) {
return true;
}
// consider boxing
if (other.isPrimitive()) {
if (this.getQualifiedName().equals(Object.class.getCanonicalName())) {
return true;
} else {
// Check if 'other' can be boxed to match this type
if (isCorrespondingBoxingType(other.describe())) return true;
// Resolve the boxed type and check if it can be assigned via widening reference conversion
SymbolReference<ResolvedReferenceTypeDeclaration> type = typeSolver.tryToSolveType(other.asPrimitive().getBoxTypeQName());
return type.getCorrespondingDeclaration().canBeAssignedTo(super.typeDeclaration);
}
}
if (other instanceof LambdaArgumentTypePlaceholder) {
return this.getTypeDeclaration().hasAnnotation(FunctionalInterface.class.getCanonicalName());
} else if (other instanceof ReferenceTypeImpl) {
ReferenceTypeImpl otherRef = (ReferenceTypeImpl) other;
if (compareConsideringTypeParameters(otherRef)) {
return true;
}
for (ResolvedReferenceType otherAncestor : otherRef.getAllAncestors()) {
if (compareConsideringTypeParameters(otherAncestor)) {
return true;
}
}
return false;
} else if (other.isTypeVariable()) {
for (ResolvedTypeParameterDeclaration.Bound bound : other.asTypeVariable().asTypeParameter().getBounds()) {
if (bound.isExtends()) {
if (this.isAssignableBy(bound.getType())) {
return true;
}
}
}
return false;
} else if (other.isConstraint()){
return isAssignableBy(other.asConstraintType().getBound());
} else if (other.isWildcard()) {
if (this.getQualifiedName().equals(Object.class.getCanonicalName())) {
return true;
} else if (other.asWildcard().isExtends()) {
return isAssignableBy(other.asWildcard().getBoundedType());
} else {
return false;
}
} else {
return false;
}
}
@Override
public Set<MethodUsage> getDeclaredMethods() {
// TODO replace variables
Set<MethodUsage> methods = new HashSet<>();
for (ResolvedMethodDeclaration methodDeclaration : getTypeDeclaration().getDeclaredMethods()) {
MethodUsage methodUsage = new MethodUsage(methodDeclaration);
methods.add(methodUsage);
}
return methods;
}
@Override
public ResolvedType toRawType() {
if (this.isRawType()) {
return this;
} else {
return new ReferenceTypeImpl(typeDeclaration, typeSolver);
}
}
@Override
public boolean mention(List<ResolvedTypeParameterDeclaration> typeParameters) {
return typeParametersValues().stream().anyMatch(tp -> tp.mention(typeParameters));
}
/**
* Execute a transformation on all the type parameters of this element.
*/
@Override
public ResolvedType transformTypeParameters(ResolvedTypeTransformer transformer) {
ResolvedType result = this;
int i = 0;
for (ResolvedType tp : this.typeParametersValues()) {
ResolvedType transformedTp = transformer.transform(tp);
// Identity comparison on purpose
if (transformedTp != tp) {
List<ResolvedType> typeParametersCorrected = result.asReferenceType().typeParametersValues();
typeParametersCorrected.set(i, transformedTp);
result = create(typeDeclaration, typeParametersCorrected);
}
i++;
}
return result;
}
public List<ResolvedReferenceType> getAllAncestors() {
// We need to go through the inheritance line and propagate the type parametes
List<ResolvedReferenceType> ancestors = typeDeclaration.getAllAncestors();
ancestors = ancestors.stream()
.map(a -> typeParametersMap().replaceAll(a).asReferenceType())
.collect(Collectors.toList());
// Avoid repetitions of Object
ancestors.removeIf(a -> a.getQualifiedName().equals(Object.class.getCanonicalName()));
ResolvedReferenceTypeDeclaration objectType = typeSolver.solveType(Object.class.getCanonicalName());
ResolvedReferenceType objectRef = create(objectType);
ancestors.add(objectRef);
return ancestors;
}
public ResolvedReferenceType deriveTypeParameters(ResolvedTypeParametersMap typeParametersMap) {
return create(typeDeclaration, typeParametersMap);
}
}
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