com.github.javaparser.ast.expr.ConditionalExpr Maven / Gradle / Ivy

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/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2023 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 {

    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 accept(final GenericVisitor v, final A arg) {
        return v.visit(this, arg);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
    public  void accept(final VoidVisitor 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.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 action) {
        action.accept(this);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public Optional 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();
    }
}
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