package adql.query.operand;
/*
* This file is part of ADQLLibrary.
*
* ADQLLibrary is free software: you can redistribute it and/or modify
* it under the terms of 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.
*
* ADQLLibrary 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with ADQLLibrary. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2012,2014 - UDS/Centre de Données astronomiques de Strasbourg (CDS),
* Astronomisches Rechen Institut (ARI)
*/
import adql.query.ADQLObject;
/**
* <p>Any ADQL operand (an operation, a constant, a column name, a function, ...) must implement this interface
* and indicates whether it corresponds to a numeric, a string or a geometrical region value.</p>
*
* @author Grégory Mantelet (CDS;ARI)
* @version 1.3 (10/2014)
*/
public interface ADQLOperand extends ADQLObject {
/**
* Tell whether this operand is numeric or not.
*
* @return <i>true</i> if this operand is numeric, <i>false</i> otherwise.
*/
public boolean isNumeric();
/**
* Tell whether this operand is a string or not.
*
* @return <i>true</i> if this operand is a string, <i>false</i> otherwise.
*/
public boolean isString();
/**
* Tell whether this operand is a geometrical region or not.
*
* @return <i>true</i> if this operand is a geometry, <i>false</i> otherwise.
*
* @since 1.3
*/
public boolean isGeometry();
}