Application: gvSIG desktop

package org.gvsig.sldsupport.filterencoding.operations;

import java.util.ArrayList;

import java.util.Hashtable;

/**

 * Implements the functionality of a null constant

 *

 * @author Pepe Vidal Salvador - jose.vidal.salvador@iver.es

 *

 */

public class NullConstant extends Operator{

        public String getName() {

                return OperationTags.NULL_CONSTANT;

        }

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

                super(symbol_table);

        }

        public void addArgument(int i, Expression arg) {

                throw new RuntimeException("Cannot add an argument to a constant");

        }

        public void check() throws ExpressionException {

                return;

        }

        public Object evaluate() throws ExpressionException {

                return null;

        }

        public ArrayList<Expression> getArguments() {

                return null;

        }

        public String getPattern() {

                return null;

        }

        public void setArguments(ArrayList<Expression> arguments) {

                // TODO Auto-generated method stub

                throw new Error("Not yet implemented");

        }

}