| /* |
| * 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.model.resolution; |
| |
| import com.github.javaparser.resolution.declarations.ResolvedDeclaration; |
| |
| import java.util.Optional; |
| |
| /** |
| * A reference to a symbol. It can solved or not solved. If solved the corresponding |
| * declaration will be provided. |
| * |
| * @author Federico Tomassetti |
| */ |
| public class SymbolReference<S extends ResolvedDeclaration> { |
| |
| private Optional<? extends S> correspondingDeclaration; |
| |
| private SymbolReference(Optional<? extends S> correspondingDeclaration) { |
| this.correspondingDeclaration = correspondingDeclaration; |
| } |
| |
| /** |
| * Create a solve reference to the given symbol. |
| */ |
| public static <S extends ResolvedDeclaration, S2 extends S> SymbolReference<S> solved(S2 symbolDeclaration) { |
| return new SymbolReference<S>(Optional.of(symbolDeclaration)); |
| } |
| |
| /** |
| * Create an unsolved reference specifying the type of the value expected. |
| */ |
| public static <S extends ResolvedDeclaration, S2 extends S> SymbolReference<S> unsolved(Class<S2> clazz) { |
| return new SymbolReference<>(Optional.empty()); |
| } |
| |
| @Override |
| public String toString() { |
| return "SymbolReference{" + correspondingDeclaration + "}"; |
| } |
| |
| /** |
| * The corresponding declaration. If not solve this throws UnsupportedOperationException. |
| */ |
| public S getCorrespondingDeclaration() { |
| if (!isSolved()) { |
| throw new UnsupportedOperationException("CorrespondingDeclaration not available for unsolved symbol."); |
| } |
| return correspondingDeclaration.get(); |
| } |
| |
| /** |
| * Is the reference solved? |
| */ |
| public boolean isSolved() { |
| return correspondingDeclaration.isPresent(); |
| } |
| |
| public static <O extends ResolvedDeclaration> SymbolReference<O> adapt(SymbolReference<? extends O> ref, Class<O> clazz) { |
| if (ref.isSolved()) { |
| return SymbolReference.solved(ref.getCorrespondingDeclaration()); |
| } else { |
| return SymbolReference.unsolved(clazz); |
| } |
| } |
| } |