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The core parser functionality. This may be all you need.
/*
* Copyright (C) 2015-2016 Federico Tomassetti
* Copyright (C) 2017-2023 The JavaParser Team.
*
* This file is part of JavaParser.
*
* JavaParser can be used either under the terms of
* a) the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* b) the terms of the Apache License
*
* You should have received a copy of both licenses in LICENCE.LGPL and
* LICENCE.APACHE. Please refer to those files for details.
*
* JavaParser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*/
package com.github.javaparser.resolution.logic;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import com.github.javaparser.resolution.TypeSolver;
import com.github.javaparser.resolution.declarations.ResolvedReferenceTypeDeclaration;
import com.github.javaparser.resolution.declarations.ResolvedTypeParameterDeclaration;
import com.github.javaparser.resolution.model.typesystem.ReferenceTypeImpl;
import com.github.javaparser.resolution.types.*;
/**
* @author Federico Tomassetti
*/
public class InferenceContext {
private int nextInferenceVariableId = 0;
private TypeSolver typeSolver;
private List inferenceVariableTypes = new ArrayList<>();
private Map inferenceVariableTypeMap = new HashMap<>();
public InferenceContext(TypeSolver typeSolver) {
this.typeSolver = typeSolver;
}
private InferenceVariableType inferenceVariableTypeForTp(ResolvedTypeParameterDeclaration tp) {
if (!inferenceVariableTypeMap.containsKey(tp.getName())) {
InferenceVariableType inferenceVariableType = new InferenceVariableType(nextInferenceVariableId++, typeSolver);
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 ancestors = actualTypeAsReference.getAllAncestors();
final String formalParamTypeQName = formalTypeAsReference.getQualifiedName();
// Interfaces do not extend the class Object,
// which means that if the formal parameter is of type Object,
// all types can match including the actual type.
List correspondingFormalType = "java.lang.Object".equals(formalParamTypeQName) ?
Stream.concat(new ArrayList(Arrays.asList(actualType)).stream(),
ancestors.stream().map(ancestor -> ancestor.asReferenceType()).collect(Collectors.toList()).stream())
.collect(Collectors.toList()):
ancestors.stream().filter((a) -> a.getQualifiedName().equals(formalParamTypeQName)).collect(Collectors.toList());
if (correspondingFormalType.isEmpty()) {
ancestors = formalTypeAsReference.getAllAncestors();
final String actualParamTypeQname = actualTypeAsReference.getQualifiedName();
List correspondingActualType = ancestors.stream().filter(a -> a.getQualifiedName().equals(actualParamTypeQname)).collect(Collectors.toList());
if (correspondingActualType.isEmpty()) {
throw new ConflictingGenericTypesException(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 {
ResolvedReferenceTypeDeclaration resolvedTypedeclaration = typeSolver.solveType(actualType.asPrimitive().getBoxTypeQName());
registerCorrespondance(formalType, new ReferenceTypeImpl(resolvedTypedeclaration));
}
} else if (actualType.isReferenceType()) {
if (formalType.isPrimitive()) {
if (formalType.asPrimitive().getBoxTypeQName().equals(actualType.describe())) {
ResolvedReferenceTypeDeclaration resolvedTypedeclaration = typeSolver.solveType(formalType.asPrimitive().getBoxTypeQName());
registerCorrespondance(new ReferenceTypeImpl(resolvedTypedeclaration), actualType);
} else {
// nothing to do
}
} else {
// nothing to do
}
} else if (formalType.isReferenceType()) {
ResolvedReferenceType formalTypeAsReference = formalType.asReferenceType();
if (formalTypeAsReference.isJavaLangObject()) {
// nothing to do
} else {
throw new UnsupportedOperationException(formalType.describe() + " " + actualType.describe());
}
} 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()));
}
if (type.asWildcard().isSuper()) {
return ResolvedWildcard.superBound(placeInferenceVariables(type.asWildcard().getBoundedType()));
}
return type;
}
if (type.isTypeVariable()) {
return inferenceVariableTypeForTp(type.asTypeParameter());
}
if (type.isReferenceType()) {
return type.asReferenceType().transformTypeParameters(tp -> placeInferenceVariables(tp));
}
if (type.isArray()) {
return new ResolvedArrayType(placeInferenceVariables(type.asArrayType().getComponentType()));
}
if (type.isNull() || type.isPrimitive() || type.isVoid()) {
return type;
}
if (type.isConstraint()) {
return ResolvedLambdaConstraintType.bound(placeInferenceVariables(type.asConstraintType().getBound()));
}
if (type instanceof InferenceVariableType) {
return type;
}
throw new UnsupportedOperationException(type.describe());
}
public ResolvedType resolve(ResolvedType type) {
if (type instanceof InferenceVariableType) {
InferenceVariableType inferenceVariableType = (InferenceVariableType) type;
return inferenceVariableType.equivalentType();
}
if (type.isReferenceType()) {
return type.asReferenceType().transformTypeParameters(tp -> resolve(tp));
}
if (type.isNull() || type.isPrimitive() || type.isVoid()) {
return type;
}
if (type.isArray()) {
return new ResolvedArrayType(resolve(type.asArrayType().getComponentType()));
}
if (type.isWildcard()) {
if (type.asWildcard().isExtends()) {
return ResolvedWildcard.extendsBound(resolve(type.asWildcard().getBoundedType()));
}
if (type.asWildcard().isSuper()) {
return ResolvedWildcard.superBound(resolve(type.asWildcard().getBoundedType()));
}
return type;
}
throw new UnsupportedOperationException(type.describe());
}
}