package adql.query;
import adql.search.ISearchHandler;
/*
* 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 2012-2015 - UDS/Centre de Données astronomiques de Strasbourg (CDS),
* Astronomisches Rechen Institute (ARI)
*/
/**
* <p>This class gathers all main behaviors of any ADQL object (query, clause, columns, condition, etc...):
* <ul>
* <li>to have a name in ADQL</i>
* <li>to be written in ADQL</li>
* <li>to offer a way to search any ADQL item <i>(included itself)</i></li>
* <li>to get its position in the original ADQL query.</li>
* </ul>
* </p>
*
* @author Grégory Mantelet (CDS;ARI)
* @version 1.4 (06/2015)
*/
public interface ADQLObject {
/**
* Gets the name of this object in ADQL.
*
* @return The name of this ADQL object.
*/
public String getName();
/**
* <p>Gets the position of this object/token in the ADQL query.</p>
* <p><i>By default, no position should be set.</i></p>
*
* @return Position of this ADQL item in the ADQL query,
* or NULL if not written originally in the query (for example, if added afterwards.
*
* @since 1.4
*/
public TextPosition getPosition();
/**
* Gets the ADQL expression of this object.
*
* @return The corresponding ADQL expression.
*/
public String toADQL();
/**
* Gets a (deep) copy of this ADQL object.
*
* @return The copy of this ADQL object.
*
* @throws Exception If there is any error during the copy.
*/
public ADQLObject getCopy() throws Exception;
/**
* <p>Gets an iterator on the intern ADQL objects.</p>
* <p><i>
* <u>Note:</u>The returned iterator is particularly used by a {@link ISearchHandler}
* extension to browse a whole ADQL tree.
* </i></p>
*
* @return An ADQL objects iterator.
*
* @see ADQLIterator
* @see ISearchHandler
*/
public ADQLIterator adqlIterator();
}