/
LambdaExprContext.java
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/
LambdaExprContext.java
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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.symbolsolver.javaparsermodel.JavaParserFacade;
import com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFactory;
import com.github.javaparser.symbolsolver.logic.FunctionalInterfaceLogic;
import com.github.javaparser.symbolsolver.logic.GenericTypeInferenceLogic;
import com.github.javaparser.symbolsolver.model.declarations.MethodDeclaration;
import com.github.javaparser.symbolsolver.model.declarations.TypeDeclaration;
import com.github.javaparser.symbolsolver.model.declarations.TypeParameterDeclaration;
import com.github.javaparser.symbolsolver.model.declarations.ValueDeclaration;
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.usages.MethodUsage;
import com.github.javaparser.symbolsolver.model.usages.typesystem.Type;
import com.github.javaparser.symbolsolver.resolution.SymbolDeclarator;
import javaslang.Tuple2;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import static com.github.javaparser.symbolsolver.javaparser.Navigator.getParentNode;
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 (ValueDeclaration decl : sb.getSymbolDeclarations()) {
if (decl.getName().equals(name)) {
if (getParentNode(wrappedNode) instanceof MethodCallExpr) {
MethodCallExpr methodCallExpr = (MethodCallExpr) getParentNode(wrappedNode);
MethodUsage methodUsage = JavaParserFacade.get(typeSolver).solveMethodAsUsage(methodCallExpr);
int i = pos(methodCallExpr, wrappedNode);
Type lambdaType = methodUsage.getParamTypes().get(i);
Value value = new Value(lambdaType.asReferenceType().typeParametersValues().get(0), name);
return Optional.of(value);
} else if (getParentNode(wrappedNode) instanceof VariableDeclarator) {
VariableDeclarator variableDeclarator = (VariableDeclarator) getParentNode(wrappedNode);
Type t = JavaParserFacade.get(typeSolver).convertToUsageVariableType(variableDeclarator);
Optional<MethodUsage> functionalMethod = FunctionalInterfaceLogic.getFunctionalMethod(t);
if (functionalMethod.isPresent()) {
Type lambdaType = functionalMethod.get().getParamType(index);
// Replace parameter from declarator
if (lambdaType.isReferenceType()) {
for (Tuple2<TypeParameterDeclaration, Type> entry : lambdaType.asReferenceType().getTypeParametersMap()) {
if (entry._2.isTypeVariable() && entry._2.asTypeParameter().declaredOnType()) {
Type ot = t.asReferenceType().typeParametersMap().getValue(entry._1);
lambdaType = lambdaType.replaceParam(entry._1.getName(), ot);
}
}
} 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 Optional<Type> solveGenericType(String name, TypeSolver typeSolver) {
MethodCallExpr parentNode = (MethodCallExpr) getParentNode(wrappedNode);
int pos = pos(parentNode, wrappedNode);
MethodUsage methodUsage = JavaParserFacade.get(typeSolver).solveMethodAsUsage((MethodCallExpr) parentNode);
Type lambda = methodUsage.getParamTypes().get(pos);
List<Tuple2<Type, Type>> formalActualTypePairs = new ArrayList<>();
for (int i = 0; i < methodUsage.getDeclaration().getNumberOfParams(); i++) {
formalActualTypePairs.add(new Tuple2<>(methodUsage.getDeclaration().getParam(i).getType(), methodUsage.getParamType(i)));
}
Map<String, Type> map = GenericTypeInferenceLogic.inferGenericTypes(formalActualTypePairs);
if (map.containsKey(name)) {
return Optional.of(map.get(name));
} else {
return Optional.empty();
}
//return Optional.of(lambda.asReferenceType().typeParametersValues().get(0));
}
private int pos(MethodCallExpr callExpr, Expression param) {
int i = 0;
for (Expression p : callExpr.getArgs()) {
if (p == param) {
return i;
}
i++;
}
throw new IllegalArgumentException();
}
protected final Optional<Value> solveWithAsValue(SymbolDeclarator symbolDeclarator, String name, TypeSolver typeSolver) {
for (ValueDeclaration decl : symbolDeclarator.getSymbolDeclarations()) {
if (decl.getName().equals(name)) {
throw new UnsupportedOperationException();
}
}
return Optional.empty();
}
@Override
public SymbolReference<? extends ValueDeclaration> solveSymbol(String name, TypeSolver typeSolver) {
for (Parameter parameter : wrappedNode.getParameters()) {
SymbolDeclarator sb = JavaParserFactory.getSymbolDeclarator(parameter, typeSolver);
SymbolReference<ValueDeclaration> 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<TypeDeclaration> solveType(String name, TypeSolver typeSolver) {
return getParent().solveType(name, typeSolver);
}
@Override
public SymbolReference<MethodDeclaration> solveMethod(
String name, List<Type> argumentsTypes, TypeSolver typeSolver) {
return getParent().solveMethod(name, argumentsTypes, typeSolver);
}
}