/*

 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.

 * Copyright (C) 2011, 2013-2021 The JavaParser Team.

 *

 * This file is part of JavaParser.

 *

 * JavaParser can be used either under the terms of

 * a) the GNU Lesser General Public License as published by

 *     the Free Software Foundation, either version 3 of the License, or

 *     (at your option) any later version.

 * b) the terms of the Apache License

 *

 * You should have received a copy of both licenses in LICENCE.LGPL and

 * LICENCE.APACHE. Please refer to those files for details.

 *

 * JavaParser is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 */

package com.github.javaparser.ast.expr;

import com.github.javaparser.TokenRange;

import com.github.javaparser.ast.AllFieldsConstructor;

import com.github.javaparser.ast.Generated;

import com.github.javaparser.ast.Node;

import com.github.javaparser.ast.nodeTypes.NodeWithSimpleName;

import com.github.javaparser.ast.observer.ObservableProperty;

import com.github.javaparser.ast.stmt.ExplicitConstructorInvocationStmt;

import com.github.javaparser.ast.visitor.CloneVisitor;

import com.github.javaparser.ast.visitor.GenericVisitor;

import com.github.javaparser.ast.visitor.VoidVisitor;

import com.github.javaparser.metamodel.JavaParserMetaModel;

import com.github.javaparser.metamodel.NameExprMetaModel;

import com.github.javaparser.resolution.Resolvable;

import com.github.javaparser.resolution.UnsolvedSymbolException;

import com.github.javaparser.resolution.declarations.ResolvedValueDeclaration;

import java.util.Optional;

import java.util.function.Consumer;

import static com.github.javaparser.utils.Utils.assertNotNull;

/**

 * Whenever a SimpleName is used in an expression, it is wrapped in NameExpr.

 * <br>In {@code int x = a + 3;} a is a SimpleName inside a NameExpr.

 *

 * @author Julio Vilmar Gesser

 */

public class NameExpr extends Expression implements NodeWithSimpleName<NameExpr>, Resolvable<ResolvedValueDeclaration> {

    private SimpleName name;

    public NameExpr() {

        this(null, new SimpleName());

    }

    public NameExpr(final String name) {

        this(null, new SimpleName(name));

    }

    @AllFieldsConstructor

    public NameExpr(final SimpleName name) {

        this(name.getTokenRange().orElse(null), name);

        setRange(name.getRange().orElse(null));

    }

    /**

     * This constructor is used by the parser and is considered private.

     */

    @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")

    public NameExpr(TokenRange tokenRange, SimpleName name) {

        super(tokenRange);

        setName(name);

        customInitialization();

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")

    public <R, A> R accept(final GenericVisitor<R, A> v, final A arg) {

        return v.visit(this, arg);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")

    public <A> void accept(final VoidVisitor<A> v, final A arg) {

        v.visit(this, arg);

    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")

    public SimpleName getName() {

        return name;

    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")

    public NameExpr setName(final SimpleName name) {

        assertNotNull(name);

        if (name == this.name) {

            return this;

        }

        notifyPropertyChange(ObservableProperty.NAME, this.name, name);

        if (this.name != null)

            this.name.setParentNode(null);

        this.name = name;

        setAsParentNodeOf(name);

        return this;

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.RemoveMethodGenerator")

    public boolean remove(Node node) {

        if (node == null)

            return false;

        return super.remove(node);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.CloneGenerator")

    public NameExpr clone() {

        return (NameExpr) accept(new CloneVisitor(), null);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator")

    public NameExprMetaModel getMetaModel() {

        return JavaParserMetaModel.nameExprMetaModel;

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator")

    public boolean replace(Node node, Node replacementNode) {

        if (node == null)

            return false;

        if (node == name) {

            setName((SimpleName) replacementNode);

            return true;

        }

        return super.replace(node, replacementNode);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")

    public boolean isNameExpr() {

        return true;

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")

    public NameExpr asNameExpr() {

        return this;

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")

    public void ifNameExpr(Consumer<NameExpr> action) {

        action.accept(this);

    }

    /**

     * Attempts to resolve the declaration corresponding to the accessed name. If successful, a

     * {@link ResolvedValueDeclaration} representing the declaration of the value accessed by this {@code NameExpr} is

     * returned. Otherwise, an {@link UnsolvedSymbolException} is thrown.

     *

     * @return a {@link ResolvedValueDeclaration} representing the declaration of the accessed value.

     * @throws UnsolvedSymbolException if the declaration corresponding to the name expression could not be resolved.

     * @see FieldAccessExpr#resolve()

     * @see MethodCallExpr#resolve()

     * @see ObjectCreationExpr#resolve()

     * @see ExplicitConstructorInvocationStmt#resolve()

     */

    @Override

    public ResolvedValueDeclaration resolve() {

        return getSymbolResolver().resolveDeclaration(this, ResolvedValueDeclaration.class);

    }

    @Override

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")

    public Optional<NameExpr> toNameExpr() {

        return Optional.of(this);

    }

}