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 an AND operator

 *

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

 *

 */

public class AndOperator extends Operator{

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

        public String getName() {

                return OperationTags.AND_OP;

        }

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

                super(symbol_table);

        }

        public Object evaluate()throws ExpressionException {

                Object value1=((Expression)arguments.get(0)).evaluate();

                if (value1 ==null)

                        return false;

                Boolean result = ((Boolean)value1).booleanValue();

                for (int i = 1; i < arguments.size(); i++){

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

                        Object value2=function.evaluate();

                        if (value2 ==null)

                                return false;

                        result = result && ((Boolean)value2).booleanValue();

                }

                return result;

        }

        public void addArgument(int i, Expression arg) {

                arguments.add(i, arg);

        }

        public String getPattern() {

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

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

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

                Messages.getString(OperationTags.BOOLEAN_VALUE);        }

        public ArrayList<Expression> getArguments() {

                return arguments;

        }

        public void setArguments(ArrayList<Expression> arguments) {

                this.arguments = arguments;

        }

        public void check() throws ExpressionException {

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

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

                                throw new ExpressionException(ExpressionException.CLASS_CASTING_EXCEPTION);

                }

        }

}