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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.javaparsermodel.contexts;
import com.github.javaparser.ast.body.Parameter;
import com.github.javaparser.ast.body.VariableDeclarator;
import com.github.javaparser.ast.expr.Expression;
import com.github.javaparser.ast.expr.LambdaExpr;
import com.github.javaparser.ast.expr.MethodCallExpr;
import com.github.javaparser.resolution.MethodUsage;
import com.github.javaparser.resolution.declarations.ResolvedMethodDeclaration;
import com.github.javaparser.resolution.declarations.ResolvedTypeDeclaration;
import com.github.javaparser.resolution.declarations.ResolvedTypeParameterDeclaration;
import com.github.javaparser.resolution.declarations.ResolvedValueDeclaration;
import com.github.javaparser.resolution.types.ResolvedLambdaConstraintType;
import com.github.javaparser.resolution.types.ResolvedType;
import com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade;
import com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFactory;
import com.github.javaparser.symbolsolver.logic.FunctionalInterfaceLogic;
import com.github.javaparser.symbolsolver.logic.InferenceContext;
import com.github.javaparser.symbolsolver.model.resolution.SymbolReference;
import com.github.javaparser.symbolsolver.model.resolution.TypeSolver;
import com.github.javaparser.symbolsolver.model.resolution.Value;
import com.github.javaparser.symbolsolver.model.typesystem.ReferenceTypeImpl;
import com.github.javaparser.symbolsolver.reflectionmodel.MyObjectProvider;
import com.github.javaparser.symbolsolver.resolution.SymbolDeclarator;
import java.util.*;
import static com.github.javaparser.symbolsolver.javaparser.Navigator.requireParentNode;
/**
* @author Federico Tomassetti
*/
public class LambdaExprContext extends AbstractJavaParserContext<LambdaExpr> {
public LambdaExprContext(LambdaExpr wrappedNode, TypeSolver typeSolver) {
super(wrappedNode, typeSolver);
}
@Override
public Optional<Value> solveSymbolAsValue(String name, TypeSolver typeSolver) {
for (Parameter parameter : wrappedNode.getParameters()) {
SymbolDeclarator sb = JavaParserFactory.getSymbolDeclarator(parameter, typeSolver);
int index = 0;
for (ResolvedValueDeclaration decl : sb.getSymbolDeclarations()) {
if (decl.getName().equals(name)) {
if (requireParentNode(wrappedNode) instanceof MethodCallExpr) {
MethodCallExpr methodCallExpr = (MethodCallExpr) requireParentNode(wrappedNode);
MethodUsage methodUsage = JavaParserFacade.get(typeSolver).solveMethodAsUsage(methodCallExpr);
int i = pos(methodCallExpr, wrappedNode);
ResolvedType lambdaType = methodUsage.getParamTypes().get(i);
// Get the functional method in order for us to resolve it's type arguments properly
Optional<MethodUsage> functionalMethodOpt = FunctionalInterfaceLogic.getFunctionalMethod(lambdaType);
if (functionalMethodOpt.isPresent()){
MethodUsage functionalMethod = functionalMethodOpt.get();
InferenceContext inferenceContext = new InferenceContext(MyObjectProvider.INSTANCE);
// Resolve each type variable of the lambda, and use this later to infer the type of each
// implicit parameter
inferenceContext.addPair(lambdaType, new ReferenceTypeImpl(lambdaType.asReferenceType().getTypeDeclaration(), typeSolver));
// Find the position of this lambda argument
boolean found = false;
int lambdaParamIndex;
for (lambdaParamIndex = 0; lambdaParamIndex < wrappedNode.getParameters().size(); lambdaParamIndex++){
if (wrappedNode.getParameter(lambdaParamIndex).getName().getIdentifier().equals(name)){
found = true;
break;
}
}
if (!found) { return Optional.empty(); }
// Now resolve the argument type using the inference context
ResolvedType argType = inferenceContext.resolve(inferenceContext.addSingle(functionalMethod.getParamType(lambdaParamIndex)));
ResolvedLambdaConstraintType conType;
if (argType.isWildcard()){
conType = ResolvedLambdaConstraintType.bound(argType.asWildcard().getBoundedType());
} else {
conType = ResolvedLambdaConstraintType.bound(argType);
}
Value value = new Value(conType, name);
return Optional.of(value);
} else{
return Optional.empty();
}
} else if (requireParentNode(wrappedNode) instanceof VariableDeclarator) {
VariableDeclarator variableDeclarator = (VariableDeclarator) requireParentNode(wrappedNode);
ResolvedType t = JavaParserFacade.get(typeSolver).convertToUsageVariableType(variableDeclarator);
Optional<MethodUsage> functionalMethod = FunctionalInterfaceLogic.getFunctionalMethod(t);
if (functionalMethod.isPresent()) {
ResolvedType lambdaType = functionalMethod.get().getParamType(index);
// Replace parameter from declarator
Map<ResolvedTypeParameterDeclaration, ResolvedType> inferredTypes = new HashMap<>();
if (lambdaType.isReferenceType()) {
for (com.github.javaparser.utils.Pair<ResolvedTypeParameterDeclaration, ResolvedType> entry : lambdaType.asReferenceType().getTypeParametersMap()) {
if (entry.b.isTypeVariable() && entry.b.asTypeParameter().declaredOnType()) {
ResolvedType ot = t.asReferenceType().typeParametersMap().getValue(entry.a);
lambdaType = lambdaType.replaceTypeVariables(entry.a, ot, inferredTypes);
}
}
} else if (lambdaType.isTypeVariable() && lambdaType.asTypeParameter().declaredOnType()) {
lambdaType = t.asReferenceType().typeParametersMap().getValue(lambdaType.asTypeParameter());
}
Value value = new Value(lambdaType, name);
return Optional.of(value);
} else {
throw new UnsupportedOperationException();
}
} else {
throw new UnsupportedOperationException();
}
}
index++;
}
}
// if nothing is found we should ask the parent context
return getParent().solveSymbolAsValue(name, typeSolver);
}
@Override
public SymbolReference<? extends ResolvedValueDeclaration> solveSymbol(String name, TypeSolver typeSolver) {
for (Parameter parameter : wrappedNode.getParameters()) {
SymbolDeclarator sb = JavaParserFactory.getSymbolDeclarator(parameter, typeSolver);
SymbolReference<ResolvedValueDeclaration> symbolReference = solveWith(sb, name);
if (symbolReference.isSolved()) {
return symbolReference;
}
}
// if nothing is found we should ask the parent context
return getParent().solveSymbol(name, typeSolver);
}
@Override
public SymbolReference<ResolvedTypeDeclaration> solveType(String name, TypeSolver typeSolver) {
return getParent().solveType(name, typeSolver);
}
@Override
public SymbolReference<ResolvedMethodDeclaration> solveMethod(
String name, List<ResolvedType> argumentsTypes, boolean staticOnly, TypeSolver typeSolver) {
return getParent().solveMethod(name, argumentsTypes, false, typeSolver);
}
///
/// Protected methods
///
protected final Optional<Value> solveWithAsValue(SymbolDeclarator symbolDeclarator, String name, TypeSolver typeSolver) {
for (ResolvedValueDeclaration decl : symbolDeclarator.getSymbolDeclarations()) {
if (decl.getName().equals(name)) {
throw new UnsupportedOperationException();
}
}
return Optional.empty();
}
///
/// Private methods
///
private int pos(MethodCallExpr callExpr, Expression param) {
int i = 0;
for (Expression p : callExpr.getArguments()) {
if (p == param) {
return i;
}
i++;
}
throw new IllegalArgumentException();
}
}
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