| gvSIG desktop 1

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2005 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

package org.gvsig.symbology.fmap.labeling.lang.functions;

import org.gvsig.symbology.fmap.labeling.lang.Function;

import org.gvsig.symbology.fmap.labeling.parse.SemanticException;

import com.hardcode.gdbms.engine.instruction.EvaluationException;

public class Substring implements Function {

        public Object evaluate(Object[] args)  throws SemanticException, EvaluationException {

                final String inputString;

                final int beginIndex;

                final int endIndex;

                try {

                        inputString = (String) args[0];

                } catch (ClassCastException ccEx) {

                        throw new SemanticException(SemanticException.TYPE_MISMATCH);

                }

                try {

                        beginIndex = (Integer) args[1];

                } catch (ClassCastException ccEx) {

                        throw new SemanticException(SemanticException.TYPE_MISMATCH);

                }

                try {

                        endIndex = (Integer) args[2];

                } catch (ClassCastException ccEx) {

                        throw new SemanticException(SemanticException.TYPE_MISMATCH);

                }

                if (endIndex < beginIndex) {

                        throw new EvaluationException("Begining index is greather than the ending index!");

                }

                if (inputString == null) return "";

                try {

                        return inputString.substring(beginIndex, endIndex);

                } catch (Exception e) {

                        throw new EvaluationException(e);

                }

        }

        public int getArgumentCount() {

                return 3;

        }

        public String getName() {

                return "Substring";

        }

        public Class returnType() {

                return String.class;

        }

}