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QuestDB is High Performance Time Series Database

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 *
 * Copyright (C) 2014-2016 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.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
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package com.questdb.ql.model;

import com.questdb.std.Mutable;
import com.questdb.std.ObjectFactory;

public class QueryColumn implements Mutable {
    public final static ObjectFactory FACTORY = new ObjectFactory() {
        @Override
        public QueryColumn newInstance() {
            return new QueryColumn();
        }
    };
    private String alias;
    private int aliasPosition;
    private ExprNode ast;

    protected QueryColumn() {
    }

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

    public String getAlias() {
        return alias;
    }

    public int getAliasPosition() {
        return aliasPosition;
    }

    public ExprNode getAst() {
        return ast;
    }

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

    @Override
    public int hashCode() {
        int result = alias != null ? alias.hashCode() : 0;
        result = 31 * result + (ast != null ? ast.hashCode() : 0);
        return result;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        QueryColumn that = (QueryColumn) o;
        return alias != null ? alias.equals(that.alias) : that.alias == null && (ast != null ? ast.equals(that.ast) : that.ast == null);
    }

    public QueryColumn of(String alias, int aliasPosition, ExprNode ast) {
        this.alias = alias;
        this.aliasPosition = aliasPosition;
        this.ast = ast;
        return this;
    }
}