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A Symbol Solver for Java, built on top of JavaParser (core)
/*
* 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.javaparsermodel;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.NodeList;
import com.github.javaparser.ast.body.*;
import com.github.javaparser.ast.body.EnumDeclaration;
import com.github.javaparser.ast.expr.*;
import com.github.javaparser.ast.stmt.ExplicitConstructorInvocationStmt;
import com.github.javaparser.ast.type.ClassOrInterfaceType;
import com.github.javaparser.ast.type.UnknownType;
import com.github.javaparser.ast.type.WildcardType;
import com.github.javaparser.symbolsolver.core.resolution.Context;
import com.github.javaparser.symbolsolver.javaparsermodel.declarations.*;
import com.github.javaparser.symbolsolver.model.declarations.*;
import com.github.javaparser.symbolsolver.model.declarations.AnnotationDeclaration;
import com.github.javaparser.symbolsolver.model.declarations.ConstructorDeclaration;
import com.github.javaparser.symbolsolver.model.declarations.MethodDeclaration;
import com.github.javaparser.symbolsolver.model.declarations.TypeDeclaration;
import com.github.javaparser.symbolsolver.model.methods.MethodUsage;
import com.github.javaparser.symbolsolver.model.resolution.SymbolReference;
import com.github.javaparser.symbolsolver.model.resolution.TypeSolver;
import com.github.javaparser.symbolsolver.model.typesystem.*;
import com.github.javaparser.symbolsolver.resolution.ConstructorResolutionLogic;
import com.github.javaparser.symbolsolver.resolution.SymbolSolver;
import java.util.*;
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import static com.github.javaparser.symbolsolver.javaparser.Navigator.getParentNode;
/**
* Class to be used by final users to solve symbols for JavaParser ASTs.
*
* @author Federico Tomassetti
*/
public class JavaParserFacade {
private static Logger logger = Logger.getLogger(JavaParserFacade.class.getCanonicalName());
static {
logger.setLevel(Level.INFO);
ConsoleHandler consoleHandler = new ConsoleHandler();
consoleHandler.setLevel(Level.INFO);
logger.addHandler(consoleHandler);
}
private static Map instances = new WeakHashMap<>();
private TypeSolver typeSolver;
private SymbolSolver symbolSolver;
private Map cacheWithLambdasSolved = new IdentityHashMap<>();
private Map cacheWithoutLambdasSolved = new IdentityHashMap<>();
private TypeExtractor typeExtractor;
private JavaParserFacade(TypeSolver typeSolver) {
this.typeSolver = typeSolver.getRoot();
this.symbolSolver = new SymbolSolver(typeSolver);
this.typeExtractor = new TypeExtractor(typeSolver, this);
}
public TypeSolver getTypeSolver() {
return typeSolver;
}
public SymbolSolver getSymbolSolver() {
return symbolSolver;
}
public static JavaParserFacade get(TypeSolver typeSolver) {
return instances.computeIfAbsent(typeSolver, JavaParserFacade::new);
}
/**
* This method is used to clear internal caches for the sake of releasing memory.
*/
public static void clearInstances() {
instances.clear();
}
protected static Type solveGenericTypes(Type type, Context context, TypeSolver typeSolver) {
if (type.isTypeVariable()) {
Optional solved = context.solveGenericType(type.describe(), typeSolver);
if (solved.isPresent()) {
return solved.get();
} else {
return type;
}
} else if (type.isWildcard()) {
if (type.asWildcard().isExtends() || type.asWildcard().isSuper()) {
Wildcard wildcardUsage = type.asWildcard();
Type boundResolved = solveGenericTypes(wildcardUsage.getBoundedType(), context, typeSolver);
if (wildcardUsage.isExtends()) {
return Wildcard.extendsBound(boundResolved);
} else {
return Wildcard.superBound(boundResolved);
}
} else {
return type;
}
} else {
Type result = type;
return result;
}
}
public SymbolReference solve(NameExpr nameExpr) {
return symbolSolver.solveSymbol(nameExpr.getName().getId(), nameExpr);
}
public SymbolReference solve(SimpleName nameExpr) {
return symbolSolver.solveSymbol(nameExpr.getId(), nameExpr);
}
public SymbolReference solve(Expression expr) {
if (expr instanceof NameExpr) {
return solve((NameExpr) expr);
} else {
throw new IllegalArgumentException(expr.getClass().getCanonicalName());
}
}
public SymbolReference solve(MethodCallExpr methodCallExpr) {
return solve(methodCallExpr, true);
}
public SymbolReference solve(ObjectCreationExpr objectCreationExpr) {
return solve(objectCreationExpr, true);
}
public SymbolReference solve(ExplicitConstructorInvocationStmt explicitConstructorInvocationStmt) {
return solve(explicitConstructorInvocationStmt, true);
}
public SymbolReference solve(ExplicitConstructorInvocationStmt explicitConstructorInvocationStmt, boolean solveLambdas) {
List argumentTypes = new LinkedList<>();
List placeholders = new LinkedList<>();
solveArguments(explicitConstructorInvocationStmt, explicitConstructorInvocationStmt.getArguments(), solveLambdas, argumentTypes, placeholders);
Optional optAncestor = explicitConstructorInvocationStmt.getAncestorOfType(ClassOrInterfaceDeclaration.class);
if (!optAncestor.isPresent()) {
return SymbolReference.unsolved(ConstructorDeclaration.class);
}
ClassOrInterfaceDeclaration classNode = optAncestor.get();
TypeDeclaration typeDecl = null;
if (!explicitConstructorInvocationStmt.isThis()) {
Type classDecl = JavaParserFacade.get(typeSolver).convert(classNode.getExtendedTypes(0), classNode);
if (classDecl.isReferenceType()) {
typeDecl = classDecl.asReferenceType().getTypeDeclaration();
}
} else {
SymbolReference sr = JavaParserFactory.getContext(classNode, typeSolver).solveType(classNode.getNameAsString(), typeSolver);
if (sr.isSolved()) {
typeDecl = sr.getCorrespondingDeclaration();
}
}
if (typeDecl == null) {
return SymbolReference.unsolved(ConstructorDeclaration.class);
}
SymbolReference res = ConstructorResolutionLogic.findMostApplicable(((ClassDeclaration) typeDecl).getConstructors(), argumentTypes, typeSolver);
for (LambdaArgumentTypePlaceholder placeholder : placeholders) {
placeholder.setMethod(res);
}
return res;
}
public SymbolReference solve(ThisExpr node){
// If 'this' is prefixed by a class eg. MyClass.this
if (node.getClassExpr().isPresent()){
// Get the class name
String className = node.getClassExpr().get().toString();
// Attempt to resolve using a typeSolver
SymbolReference clazz = typeSolver.tryToSolveType(className);
if (clazz.isSolved()){
return SymbolReference.solved(clazz.getCorrespondingDeclaration());
}
// Attempt to resolve locally in Compilation unit
Optional cu = node.getAncestorOfType(CompilationUnit.class);
if (cu.isPresent()){
Optional classByName = cu.get().getClassByName(className);
if (classByName.isPresent()){
return SymbolReference.solved(getTypeDeclaration(classByName.get()));
}
}
}
return SymbolReference.solved(getTypeDeclaration(findContainingTypeDecl(node)));
}
/**
* Given a constructor call find out to which constructor declaration it corresponds.
*/
public SymbolReference solve(ObjectCreationExpr objectCreationExpr, boolean solveLambdas) {
List argumentTypes = new LinkedList<>();
List placeholders = new LinkedList<>();
solveArguments(objectCreationExpr, objectCreationExpr.getArguments(), solveLambdas, argumentTypes, placeholders);
Type classDecl = JavaParserFacade.get(typeSolver).convert(objectCreationExpr.getType(), objectCreationExpr);
if (!classDecl.isReferenceType()) {
return SymbolReference.unsolved(ConstructorDeclaration.class);
}
SymbolReference res = ConstructorResolutionLogic.findMostApplicable(((ClassDeclaration) classDecl.asReferenceType().getTypeDeclaration()).getConstructors(), argumentTypes, typeSolver);
for (LambdaArgumentTypePlaceholder placeholder : placeholders) {
placeholder.setMethod(res);
}
return res;
}
private void solveArguments(Node node, NodeList args, boolean solveLambdas, List argumentTypes, List placeholders) {
int i = 0;
for (Expression parameterValue : args) {
if (parameterValue instanceof LambdaExpr || parameterValue instanceof MethodReferenceExpr) {
LambdaArgumentTypePlaceholder placeholder = new LambdaArgumentTypePlaceholder(i);
argumentTypes.add(placeholder);
placeholders.add(placeholder);
} else {
try {
argumentTypes.add(JavaParserFacade.get(typeSolver).getType(parameterValue, solveLambdas));
} catch (UnsolvedSymbolException e) {
throw e;
} catch (Exception e) {
throw new RuntimeException(String.format("Unable to calculate the type of a parameter of a method call. Method call: %s, Parameter: %s",
node, parameterValue), e);
}
}
i++;
}
}
/**
* Given a method call find out to which method declaration it corresponds.
*/
public SymbolReference solve(MethodCallExpr methodCallExpr, boolean solveLambdas) {
List argumentTypes = new LinkedList<>();
List placeholders = new LinkedList<>();
solveArguments(methodCallExpr, methodCallExpr.getArguments(), solveLambdas, argumentTypes, placeholders);
SymbolReference res = JavaParserFactory.getContext(methodCallExpr, typeSolver).solveMethod(methodCallExpr.getName().getId(), argumentTypes, false, typeSolver);
for (LambdaArgumentTypePlaceholder placeholder : placeholders) {
placeholder.setMethod(res);
}
return res;
}
public SymbolReference solve(AnnotationExpr annotationExpr) {
Context context = JavaParserFactory.getContext(annotationExpr, typeSolver);
SymbolReference typeDeclarationSymbolReference = context.solveType(annotationExpr.getNameAsString(), typeSolver);
AnnotationDeclaration annotationDeclaration = (AnnotationDeclaration) typeDeclarationSymbolReference.getCorrespondingDeclaration();
if (typeDeclarationSymbolReference.isSolved()) {
return SymbolReference.solved(annotationDeclaration);
} else {
return SymbolReference.unsolved(AnnotationDeclaration.class);
}
}
public Type getType(Node node) {
return getType(node, true);
}
public Type getType(Node node, boolean solveLambdas) {
if (solveLambdas) {
if (!cacheWithLambdasSolved.containsKey(node)) {
Type res = getTypeConcrete(node, solveLambdas);
cacheWithLambdasSolved.put(node, res);
boolean secondPassNecessary = false;
if (node instanceof MethodCallExpr) {
MethodCallExpr methodCallExpr = (MethodCallExpr) node;
for (Node arg : methodCallExpr.getArguments()) {
if (!cacheWithLambdasSolved.containsKey(arg)) {
getType(arg, true);
secondPassNecessary = true;
}
}
}
if (secondPassNecessary) {
cacheWithLambdasSolved.remove(node);
cacheWithLambdasSolved.put(node, getType(node, true));
}
logger.finer("getType on " + node + " -> " + res);
}
return cacheWithLambdasSolved.get(node);
} else {
Optional res = find(cacheWithLambdasSolved, node);
if (res.isPresent()) {
return res.get();
}
res = find(cacheWithoutLambdasSolved, node);
if (!res.isPresent()) {
Type resType = getTypeConcrete(node, solveLambdas);
cacheWithoutLambdasSolved.put(node, resType);
logger.finer("getType on " + node + " (no solveLambdas) -> " + res);
return resType;
}
return res.get();
}
}
private Optional find(Map map, Node node) {
if (map.containsKey(node)) {
return Optional.of(map.get(node));
}
if (node instanceof LambdaExpr) {
return find(map, (LambdaExpr) node);
} else {
return Optional.empty();
}
}
/**
* For some reasons LambdaExprs are duplicate and the equals method is not implemented correctly.
*
* @param map
* @return
*/
private Optional find(Map map, LambdaExpr lambdaExpr) {
for (Node key : map.keySet()) {
if (key instanceof LambdaExpr) {
LambdaExpr keyLambdaExpr = (LambdaExpr) key;
if (keyLambdaExpr.toString().equals(lambdaExpr.toString()) && getParentNode(keyLambdaExpr) == getParentNode(lambdaExpr)) {
return Optional.of(map.get(keyLambdaExpr));
}
}
}
return Optional.empty();
}
protected MethodUsage toMethodUsage(MethodReferenceExpr methodReferenceExpr) {
if (!(methodReferenceExpr.getScope() instanceof TypeExpr)) {
throw new UnsupportedOperationException();
}
TypeExpr typeExpr = (TypeExpr) methodReferenceExpr.getScope();
if (!(typeExpr.getType() instanceof com.github.javaparser.ast.type.ClassOrInterfaceType)) {
throw new UnsupportedOperationException(typeExpr.getType().getClass().getCanonicalName());
}
ClassOrInterfaceType classOrInterfaceType = (ClassOrInterfaceType) typeExpr.getType();
SymbolReference typeDeclarationSymbolReference = JavaParserFactory.getContext(classOrInterfaceType, typeSolver).solveType(classOrInterfaceType.getName().getId(), typeSolver);
if (!typeDeclarationSymbolReference.isSolved()) {
throw new UnsupportedOperationException();
}
List methodUsages = ((ReferenceTypeDeclaration) typeDeclarationSymbolReference.getCorrespondingDeclaration()).getAllMethods().stream().filter(it -> it.getName().equals(methodReferenceExpr.getIdentifier())).collect(Collectors.toList());
switch (methodUsages.size()) {
case 0:
throw new UnsupportedOperationException();
case 1:
return methodUsages.get(0);
default:
throw new UnsupportedOperationException();
}
}
protected Type getBinaryTypeConcrete(Node left, Node right, boolean solveLambdas) {
Type leftType = getTypeConcrete(left, solveLambdas);
Type rightType = getTypeConcrete(right, solveLambdas);
if (rightType.isAssignableBy(leftType)) {
return rightType;
}
return leftType;
}
/**
* Should return more like a TypeApplication: a TypeDeclaration and possible typeParametersValues or array
* modifiers.
*
* @return
*/
private Type getTypeConcrete(Node node, boolean solveLambdas) {
if (node == null) throw new IllegalArgumentException();
return node.accept(typeExtractor, solveLambdas);
}
protected com.github.javaparser.ast.body.TypeDeclaration findContainingTypeDecl(Node node) {
if (node instanceof ClassOrInterfaceDeclaration) {
return (ClassOrInterfaceDeclaration) node;
} else if (node instanceof EnumDeclaration) {
return (EnumDeclaration) node;
} else if (getParentNode(node) == null) {
throw new IllegalArgumentException();
} else {
return findContainingTypeDecl(getParentNode(node));
}
}
public Type convertToUsageVariableType(VariableDeclarator var) {
Type type = JavaParserFacade.get(typeSolver).convertToUsage(var.getType(), var);
return type;
}
public Type convertToUsage(com.github.javaparser.ast.type.Type type, Node context) {
if (type instanceof UnknownType) {
throw new IllegalArgumentException("Unknown type");
}
return convertToUsage(type, JavaParserFactory.getContext(context, typeSolver));
}
public Type convertToUsage(com.github.javaparser.ast.type.Type type) {
return convertToUsage(type, type);
}
// This is an hack around an issue in JavaParser
private String qName(ClassOrInterfaceType classOrInterfaceType) {
String name = classOrInterfaceType.getName().getId();
if (classOrInterfaceType.getScope().isPresent()) {
return qName(classOrInterfaceType.getScope().get()) + "." + name;
} else {
return name;
}
}
protected Type convertToUsage(com.github.javaparser.ast.type.Type type, Context context) {
if (type instanceof ClassOrInterfaceType) {
ClassOrInterfaceType classOrInterfaceType = (ClassOrInterfaceType) type;
String name = qName(classOrInterfaceType);
SymbolReference ref = context.solveType(name, typeSolver);
if (!ref.isSolved()) {
throw new UnsolvedSymbolException(name);
}
TypeDeclaration typeDeclaration = ref.getCorrespondingDeclaration();
List typeParameters = Collections.emptyList();
if (classOrInterfaceType.getTypeArguments().isPresent()) {
typeParameters = classOrInterfaceType.getTypeArguments().get().stream().map((pt) -> convertToUsage(pt, context)).collect(Collectors.toList());
}
if (typeDeclaration.isTypeParameter()) {
if (typeDeclaration instanceof TypeParameterDeclaration) {
return new TypeVariable((TypeParameterDeclaration) typeDeclaration);
} else {
JavaParserTypeVariableDeclaration javaParserTypeVariableDeclaration = (JavaParserTypeVariableDeclaration) typeDeclaration;
return new TypeVariable(javaParserTypeVariableDeclaration.asTypeParameter());
}
} else {
return new ReferenceTypeImpl((ReferenceTypeDeclaration) typeDeclaration, typeParameters, typeSolver);
}
} else if (type instanceof com.github.javaparser.ast.type.PrimitiveType) {
return PrimitiveType.byName(((com.github.javaparser.ast.type.PrimitiveType) type).getType().name());
} else if (type instanceof WildcardType) {
WildcardType wildcardType = (WildcardType) type;
if (wildcardType.getExtendedTypes().isPresent() && !wildcardType.getSuperTypes().isPresent()) {
return Wildcard.extendsBound(convertToUsage(wildcardType.getExtendedTypes().get(), context)); // removed (ReferenceTypeImpl)
} else if (!wildcardType.getExtendedTypes().isPresent() && wildcardType.getSuperTypes().isPresent()) {
return Wildcard.superBound(convertToUsage(wildcardType.getSuperTypes().get(), context)); // removed (ReferenceTypeImpl)
} else if (!wildcardType.getExtendedTypes().isPresent() && !wildcardType.getSuperTypes().isPresent()) {
return Wildcard.UNBOUNDED;
} else {
throw new UnsupportedOperationException(wildcardType.toString());
}
} else if (type instanceof com.github.javaparser.ast.type.VoidType) {
return VoidType.INSTANCE;
} else if (type instanceof com.github.javaparser.ast.type.ArrayType) {
com.github.javaparser.ast.type.ArrayType jpArrayType = (com.github.javaparser.ast.type.ArrayType) type;
return new ArrayType(convertToUsage(jpArrayType.getComponentType(), context));
} else {
throw new UnsupportedOperationException(type.getClass().getCanonicalName());
}
}
public Type convert(com.github.javaparser.ast.type.Type type, Node node) {
return convert(type, JavaParserFactory.getContext(node, typeSolver));
}
public Type convert(com.github.javaparser.ast.type.Type type, Context context) {
return convertToUsage(type, context);
}
public MethodUsage solveMethodAsUsage(MethodCallExpr call) {
List params = new ArrayList<>();
if (call.getArguments() != null) {
for (Expression param : call.getArguments()) {
//getTypeConcrete(Node node, boolean solveLambdas)
try {
params.add(getType(param, false));
} catch (Exception e) {
throw new RuntimeException(String.format("Error calculating the type of parameter %s of method call %s", param, call), e);
}
//params.add(getTypeConcrete(param, false));
}
}
Context context = JavaParserFactory.getContext(call, typeSolver);
Optional methodUsage = context.solveMethodAsUsage(call.getName().getId(), params, typeSolver);
if (!methodUsage.isPresent()) {
throw new RuntimeException("Method '" + call.getName() + "' cannot be resolved in context "
+ call + " (line: " + call.getRange().get().begin.line + ") " + context + ". Parameter types: " + params);
}
return methodUsage.get();
}
public ReferenceTypeDeclaration getTypeDeclaration(ClassOrInterfaceDeclaration classOrInterfaceDeclaration) {
return JavaParserFactory.toTypeDeclaration(classOrInterfaceDeclaration, typeSolver);
}
/**
* "this" inserted in the given point, which type would have?
*/
public Type getTypeOfThisIn(Node node) {
// TODO consider static methods
if (node instanceof ClassOrInterfaceDeclaration) {
return new ReferenceTypeImpl(getTypeDeclaration((ClassOrInterfaceDeclaration) node), typeSolver);
} else if (node instanceof EnumDeclaration) {
JavaParserEnumDeclaration enumDeclaration = new JavaParserEnumDeclaration((EnumDeclaration) node, typeSolver);
return new ReferenceTypeImpl(enumDeclaration, typeSolver);
} else {
return getTypeOfThisIn(getParentNode(node));
}
}
public ReferenceTypeDeclaration getTypeDeclaration(com.github.javaparser.ast.body.TypeDeclaration typeDeclaration) {
return JavaParserFactory.toTypeDeclaration(typeDeclaration, typeSolver);
}
}
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