Application: gvSIG desktop

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

 *

 * Copyright (C) 2004 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.sldsupport.filterencoding.operations;

import java.util.ArrayList;

import java.util.Hashtable;

public class FieldExpressionOperator extends Operator {

        private ArrayList<Expression> arguments = new ArrayList<Expression>();

        public FieldExpressionOperator(Hashtable<String, Object> symbol_table) {

                super(symbol_table);

        }

        public void addArgument(int i, Expression arg) {

                arguments.add(i, arg);

        }

        public void check()

        throws ExpressionException {

        }

        public Object evaluate()

        throws ExpressionException {

                String result = "";

                if(arguments != null) {

                        for (int i = arguments.size()-1; i >= 0; i--) {

                                Expression function = (Expression)arguments.get(i);

                                Object value1=function.evaluate();

                                if (value1==null)

                                        value1="";

                                result += ((String) (value1.toString()));

                        }

                        return result;

                }

                return null;

        }

        public ArrayList<Expression> getArguments() {

                return arguments;

        }

        public String getName() {

                return null;

        }

        public String getPattern() {

                throw new Error ("Not yet implemented");

        }

        public void setArguments(ArrayList<Expression> arguments) {

                this.arguments = arguments;

        }

}