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 *
 * Copyright (C) 2014-2019 Appsicle
 *
 * This program is free software: you can redistribute it and/or  modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program 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 Affero General Public License for more details.
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 * You should have received a copy of the GNU Affero General Public License
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package com.questdb.griffin.model;

import com.questdb.std.Mutable;
import com.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;
    }
}