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JavaParserMethodDeclaration.java
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/
JavaParserMethodDeclaration.java
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package me.tomassetti.symbolsolver.javaparsermodel.declarations;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
import me.tomassetti.symbolsolver.model.declarations.MethodDeclaration;
import me.tomassetti.symbolsolver.model.declarations.ParameterDeclaration;
import me.tomassetti.symbolsolver.model.declarations.TypeDeclaration;
import me.tomassetti.symbolsolver.model.invokations.MethodUsage;
import me.tomassetti.symbolsolver.model.resolution.Context;
import me.tomassetti.symbolsolver.model.resolution.TypeParameter;
import me.tomassetti.symbolsolver.model.resolution.TypeSolver;
import me.tomassetti.symbolsolver.model.typesystem.ReferenceTypeUsage;
import me.tomassetti.symbolsolver.model.typesystem.TypeUsage;
import me.tomassetti.symbolsolver.model.typesystem.WildcardUsage;
import me.tomassetti.symbolsolver.javaparsermodel.JavaParserFacade;
import me.tomassetti.symbolsolver.javaparsermodel.JavaParserFactory;
import java.util.*;
import java.util.stream.Collectors;
public class JavaParserMethodDeclaration implements MethodDeclaration {
private com.github.javaparser.ast.body.MethodDeclaration wrappedNode;
private TypeSolver typeSolver;
public JavaParserMethodDeclaration(com.github.javaparser.ast.body.MethodDeclaration wrappedNode, TypeSolver typeSolver) {
this.wrappedNode = wrappedNode;
this.typeSolver = typeSolver;
}
@Override
public String toString() {
return "JavaParserMethodDeclaration{" +
"wrappedNode=" + wrappedNode +
", typeSolver=" + typeSolver +
'}';
}
@Override
public TypeDeclaration declaringType() {
if (wrappedNode.getParentNode() instanceof ClassOrInterfaceDeclaration) {
return new JavaParserClassDeclaration((ClassOrInterfaceDeclaration) wrappedNode.getParentNode(), typeSolver);
} else {
throw new UnsupportedOperationException();
}
}
@Override
public TypeUsage getReturnType() {
return JavaParserFacade.get(typeSolver).convert(wrappedNode.getType(), getContext());
}
@Override
public int getNoParams() {
if (wrappedNode.getParameters() == null) {
return 0;
}
return wrappedNode.getParameters().size();
}
@Override
public ParameterDeclaration getParam(int i) {
return new JavaParserParameterDeclaration(wrappedNode.getParameters().get(i), typeSolver);
}
public MethodUsage getUsage(Node node) {
throw new UnsupportedOperationException();
}
@Override
public MethodUsage resolveTypeVariables(Context context, List<TypeUsage> parameterTypes) {
TypeUsage returnType = replaceTypeParams(new JavaParserMethodDeclaration(wrappedNode, typeSolver).getReturnType(), typeSolver, context);
List<TypeUsage> params = new ArrayList<>();
for (int i = 0; i < wrappedNode.getParameters().size(); i++) {
TypeUsage replaced = replaceTypeParams(new JavaParserMethodDeclaration(wrappedNode, typeSolver).getParam(i).getType(), typeSolver, context);
params.add(replaced);
}
// We now look at the type parameter for the method which we can derive from the parameter types
// and then we replace them in the return type
Map<String, TypeUsage> determinedTypeParameters = new HashMap<>();
for (int i = 0; i < getNoParams(); i++) {
TypeUsage formalParamType = getParam(i).getType();
TypeUsage actualParamType = parameterTypes.get(i);
determineTypeParameters(determinedTypeParameters, formalParamType, actualParamType, typeSolver);
}
for (String determinedParam : determinedTypeParameters.keySet()) {
returnType = returnType.replaceParam(determinedParam, determinedTypeParameters.get(determinedParam));
}
return new MethodUsage(new JavaParserMethodDeclaration(wrappedNode, typeSolver), params, returnType);
}
private void determineTypeParameters(Map<String, TypeUsage> determinedTypeParameters, TypeUsage formalParamType, TypeUsage actualParamType, TypeSolver typeSolver) {
if (actualParamType.isNull()) {
return;
}
if (actualParamType.isTypeVariable()) {
return;
}
if (formalParamType.isTypeVariable()) {
determinedTypeParameters.put(formalParamType.describe(), actualParamType);
return;
}
if (formalParamType instanceof WildcardUsage) {
return;
}
if (formalParamType.isReferenceType() && actualParamType.isReferenceType()
&& !formalParamType.asReferenceTypeUsage().getQualifiedName().equals(actualParamType.asReferenceTypeUsage().getQualifiedName())) {
List<ReferenceTypeUsage> ancestors = actualParamType.asReferenceTypeUsage().getAllAncestors();
final String formalParamTypeQName = formalParamType.asReferenceTypeUsage().getQualifiedName();
List<TypeUsage> correspondingFormalType = ancestors.stream().filter((a) -> a.getQualifiedName().equals(formalParamTypeQName)).collect(Collectors.toList());
if (correspondingFormalType.size() == 0) {
throw new IllegalArgumentException();
}
actualParamType = correspondingFormalType.get(0);
}
if (formalParamType.isReferenceType() && actualParamType.isReferenceType()) {
List<TypeUsage> formalTypeParams = formalParamType.asReferenceTypeUsage().parameters();
List<TypeUsage> actualTypeParams = actualParamType.asReferenceTypeUsage().parameters();
if (formalTypeParams.size() != actualTypeParams.size()) {
throw new UnsupportedOperationException();
}
for (int i = 0; i < formalTypeParams.size(); i++) {
determineTypeParameters(determinedTypeParameters, formalTypeParams.get(i), actualTypeParams.get(i), typeSolver);
}
}
}
@Override
public Context getContext() {
return JavaParserFactory.getContext(wrappedNode, typeSolver);
}
@Override
public boolean isAbstract() {
throw new UnsupportedOperationException();
}
@Override
public boolean isPrivate() {
throw new UnsupportedOperationException();
}
private Optional<TypeUsage> typeParamByName(String name, TypeSolver typeSolver, Context context) {
int i = 0;
if (wrappedNode.getTypeParameters() != null) {
for (com.github.javaparser.ast.TypeParameter tp : wrappedNode.getTypeParameters()) {
if (tp.getName().equals(name)) {
TypeUsage typeUsage = JavaParserFacade.get(typeSolver).convertToUsage(this.wrappedNode.getParameters().get(i).getType(), context);
return Optional.of(typeUsage);
}
i++;
}
}
return Optional.empty();
}
private TypeUsage replaceTypeParams(TypeUsage typeUsage, TypeSolver typeSolver, Context context) {
if (typeUsage.isTypeVariable()) {
TypeParameter typeParameter = typeUsage.asTypeParameter();
if (typeParameter.declaredOnClass()) {
Optional<TypeUsage> typeParam = typeParamByName(typeParameter.getName(), typeSolver, context);
if (typeParam.isPresent()) {
typeUsage = typeParam.get();
}
}
}
if (typeUsage.isReferenceType()) {
for (int i = 0; i < typeUsage.asReferenceTypeUsage().parameters().size(); i++) {
TypeUsage replaced = replaceTypeParams(typeUsage.asReferenceTypeUsage().parameters().get(i), typeSolver, context);
// Identity comparison on purpose
if (replaced != typeUsage.asReferenceTypeUsage().parameters().get(i)) {
typeUsage = typeUsage.asReferenceTypeUsage().replaceParam(i, replaced);
}
}
}
return typeUsage;
}
@Override
public String getName() {
return wrappedNode.getName();
}
@Override
public boolean isField() {
throw new UnsupportedOperationException();
}
@Override
public boolean isParameter() {
throw new UnsupportedOperationException();
}
@Override
public boolean isVariable() {
return false;
}
@Override
public boolean isType() {
throw new UnsupportedOperationException();
}
@Override
public List<TypeParameter> getTypeParameters() {
if (this.wrappedNode.getTypeParameters() == null) {
return Collections.emptyList();
}
return this.wrappedNode.getTypeParameters().stream().map((astTp) -> new JavaParserTypeParameter(astTp, typeSolver)).collect(Collectors.toList());
}
@Override
public boolean isPackageProtected() {
throw new UnsupportedOperationException();
}
}