com.cinchapi.ccl.syntax.ExpressionTree Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of ccl Show documentation

The official specificiation and library for the Concourse Criteria Language

There is a newer version: 3.1.2

/*
 * Copyright (c) 2013-2017 Cinchapi Inc.
 *
 * 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.cinchapi.ccl.syntax;

import java.util.Collection;
import java.util.Collections;

import com.cinchapi.ccl.grammar.Expression;
import com.cinchapi.ccl.grammar.Symbol;

/**
 * An {@link ExpressionTree} is an {@link AbstractSyntaxTree} whose root node is
 * an {@link Expression} and does not have any children.
 *
 * @author Jeff Nelson
 */
public class ExpressionTree extends BaseAbstractSyntaxTree {

    /**
     * The root.
     */
    private final Expression expression;

    /**
     * Construct a new instance.
     * 
     * @param expression
     */
    public ExpressionTree(Expression expression) {
        this.expression = expression;
    }

    @Override
    public Collection children() {
        return Collections.emptyList();
    }

    @Override
    public Symbol root() {
        return expression;
    }

    @Override
    public  T accept(Visitor visitor, Object... data) {
        return visitor.visit(this, data);
    }

}