io.questdb.griffin.model.QueryColumn Maven / Gradle / Ivy

Go to download

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

QuestDB is High Performance Time Series Database

The newest version!

/*******************************************************************************
 *     ___                  _   ____  ____
 *    / _ \ _   _  ___  ___| |_|  _ \| __ )
 *   | | | | | | |/ _ \/ __| __| | | |  _ \
 *   | |_| | |_| |  __/\__ \ |_| |_| | |_) |
 *    \__\_\\__,_|\___||___/\__|____/|____/
 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
 *
 *  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 io.questdb.griffin.model;

import io.questdb.std.Mutable;
import io.questdb.std.ObjectFactory;

public class QueryColumn implements Mutable {
    public final static ObjectFactory FACTORY = QueryColumn::new;
    private CharSequence alias;
    private ExpressionNode ast;

    protected QueryColumn() {
    }

    @Override
    public void clear() {
        alias = null;
        ast = null;
    }

    public CharSequence getAlias() {
        return alias;
    }

    public ExpressionNode getAst() {
        return ast;
    }

    public CharSequence getName() {
        return alias != null ? alias : ast.token;
    }

    public QueryColumn of(CharSequence alias, ExpressionNode ast) {
        this.alias = alias;
        this.ast = ast;
        return this;
    }
}