Application: gvSIG desktop

package org.gvsig.operators;

import org.apache.bsf.BSFException;

import org.apache.bsf.BSFManager;

import org.gvsig.baseclasses.AbstractOperator;

import org.gvsig.baseclasses.IOperator;

import org.gvsig.expresions.EvalOperatorsTask;

import com.iver.andami.PluginServices;

/**

 * @author Vicente Caballero Navarro

 */

public class Sqrt extends AbstractOperator{

        public String addText(String s) {

                return toString()+"("+s+")";

        }

        public String toString() {

                return "sqrt";

        }

        public void eval(BSFManager interpreter) throws BSFException {

//                interpreter.eval(ExpressionFieldExtension.BEANSHELL,null,-1,-1,"double sqrt(double value){return java.lang.Math.sqrt(value);};");

                interpreter.exec(EvalOperatorsTask.JYTHON,null,-1,-1,"def sqrt(value):\n" +

                                "  import java.lang.Math\n" +

                                "  return java.lang.Math.sqrt(value)");

        }

        public boolean isEnable() {

                return (getType()==IOperator.NUMBER);

        }

        public String getDescription() {

        return PluginServices.getText(this, "parameter") + ": " +

        PluginServices.getText(this, "numeric_value") + "\n" +

        PluginServices.getText(this, "returns") + ": " +

        PluginServices.getText(this, "numeric_value") + "\n" +

        PluginServices.getText(this, "description") + ": " +

        "Returns the correctly rounded positive square root of a double value. Special cases:\n" +

        "* If the argument is NaN or less than zero, then the result is NaN.\n" +

        "* If the argument is positive infinity, then the result is positive infinity.\n" +

        "* If the argument is positive zero or negative zero, then the result is the same as the argument.";

    }

}