/*

 * 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.NodeWithCondition;

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

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.ConditionalExprMetaModel;

import com.github.javaparser.metamodel.JavaParserMetaModel;

import java.util.Optional;

import java.util.function.Consumer;

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

/**

 * The ternary conditional expression.

 * In {@code b==0?x:y}, b==0 is the condition, x is thenExpr, and y is elseExpr.

 *

 * @author Julio Vilmar Gesser

 */

public class ConditionalExpr extends Expression implements NodeWithCondition<ConditionalExpr> {

    private Expression condition;

    private Expression thenExpr;

    private Expression elseExpr;

    public ConditionalExpr() {

        this(null, new BooleanLiteralExpr(), new StringLiteralExpr(), new StringLiteralExpr());

    }

    @AllFieldsConstructor

    public ConditionalExpr(Expression condition, Expression thenExpr, Expression elseExpr) {

        this(null, condition, thenExpr, elseExpr);

    }

    /**

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

     */

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

    public ConditionalExpr(TokenRange tokenRange, Expression condition, Expression thenExpr, Expression elseExpr) {

        super(tokenRange);

        setCondition(condition);

        setThenExpr(thenExpr);

        setElseExpr(elseExpr);

        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 Expression getCondition() {

        return condition;

    }

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

    public Expression getElseExpr() {

        return elseExpr;

    }

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

    public Expression getThenExpr() {

        return thenExpr;

    }

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

    public ConditionalExpr setCondition(final Expression condition) {

        assertNotNull(condition);

        if (condition == this.condition) {

            return this;

        }

        notifyPropertyChange(ObservableProperty.CONDITION, this.condition, condition);

        if (this.condition != null)

            this.condition.setParentNode(null);

        this.condition = condition;

        setAsParentNodeOf(condition);

        return this;

    }

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

    public ConditionalExpr setElseExpr(final Expression elseExpr) {

        assertNotNull(elseExpr);

        if (elseExpr == this.elseExpr) {

            return this;

        }

        notifyPropertyChange(ObservableProperty.ELSE_EXPR, this.elseExpr, elseExpr);

        if (this.elseExpr != null)

            this.elseExpr.setParentNode(null);

        this.elseExpr = elseExpr;

        setAsParentNodeOf(elseExpr);

        return this;

    }

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

    public ConditionalExpr setThenExpr(final Expression thenExpr) {

        assertNotNull(thenExpr);

        if (thenExpr == this.thenExpr) {

            return this;

        }

        notifyPropertyChange(ObservableProperty.THEN_EXPR, this.thenExpr, thenExpr);

        if (this.thenExpr != null)

            this.thenExpr.setParentNode(null);

        this.thenExpr = thenExpr;

        setAsParentNodeOf(thenExpr);

        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 ConditionalExpr clone() {

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

    }

    @Override

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

    public ConditionalExprMetaModel getMetaModel() {

        return JavaParserMetaModel.conditionalExprMetaModel;

    }

    @Override

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

    public boolean replace(Node node, Node replacementNode) {

        if (node == null)

            return false;

        if (node == condition) {

            setCondition((Expression) replacementNode);

            return true;

        }

        if (node == elseExpr) {

            setElseExpr((Expression) replacementNode);

            return true;

        }

        if (node == thenExpr) {

            setThenExpr((Expression) replacementNode);

            return true;

        }

        return super.replace(node, replacementNode);

    }

    @Override

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

    public boolean isConditionalExpr() {

        return true;

    }

    @Override

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

    public ConditionalExpr asConditionalExpr() {

        return this;

    }

    @Override

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

    public void ifConditionalExpr(Consumer<ConditionalExpr> action) {

        action.accept(this);

    }

    @Override

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

    public Optional<ConditionalExpr> toConditionalExpr() {

        return Optional.of(this);

    }

    /*

     * A reference conditional expression is a poly expression if it appears in an assignment context or an invocation context (§5.2. §5.3).

     * Otherwise, it is a standalone expression.

     */

    @Override

    public boolean isPolyExpression() {

        return appearsInAssignmentContext() || appearsInInvocationContext();

    }

}