Application: gvSIG desktop

package org.gvsig.labeling.operations;

import java.util.ArrayList;

import java.util.Hashtable;

import com.hardcode.gdbms.engine.values.Value;

import com.iver.cit.gvsig.fmap.Messages;

/**

 * Implements the funcionality of a ( >= ) operator

 *

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

 *

 */

public class GreaterThanOrEqualsOperator extends Operator  {

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

        public GreaterThanOrEqualsOperator(Hashtable<String, Value> symbol_table) {

                super(symbol_table);

        }

        public String getName() {

                return OperationTags.GREATER_THAN_OR_EQ_OP;

        }

        public Object evaluate()throws ExpressionException {

                Object eval1=((Expression)arguments.get(0)).evaluate();

                Object eval2=((Expression)arguments.get(1)).evaluate();

                if (eval1==null || eval2==null){

                        return false;

                }

                Double left = new Double(eval1.toString());

                Double right = new Double(eval2.toString());

                if (left >= right)

                        return true;

                else

                        return false;

        }

        public void addArgument(int i, Expression arg) {

                arguments.add(i, arg);

        }

        public String getPattern() {

                return "("+Messages.getString(OperationTags.OPERAND)

                + OperationTags.GREATER_THAN_OR_EQ_OP +Messages.getString(OperationTags.OPERAND)+ ")\n"+

                Messages.getString(OperationTags.OPERAND) +" = "+

                Messages.getString(OperationTags.NUMERIC_VALUE);

        }

        public ArrayList<Expression> getArguments() {

                return arguments;

        }

        public void setArguments(ArrayList<Expression> arguments) {

                this.arguments = arguments;

        }

        public void check() throws ExpressionException {

                if (arguments.size() > 2)

                        throw new ExpressionException(ExpressionException.INCORRECT_NUMBER_OF_ARGUMENTS);

                for (int i = 0; i < arguments.size(); i++) {

                        if(!(arguments.get(i).evaluate()instanceof Double))

                                throw new ExpressionException(ExpressionException.CLASS_CASTING_EXCEPTION);

                }

        }

}