Application: gvSIG desktop » gvSIG tools: Expression Field

package org.gvsig.expressionfield.project.documents.table.operators;

import org.apache.bsf.BSFException;

import org.apache.bsf.BSFManager;

import org.gvsig.andami.PluginServices;

import org.gvsig.expressionfield.ExpressionFieldExtension;

import org.gvsig.expressionfield.project.documents.table.AbstractOperator;

import org.gvsig.expressionfield.project.documents.table.IOperator;

/**

 * @author Vicente Caballero Navarro

 */

public class Pi extends AbstractOperator{

        public String addText(String s) {

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

        }

        public String toString() {

                return "pi";

        }

        public void eval(BSFManager interpreter) throws BSFException {

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

                interpreter.exec(ExpressionFieldExtension.JYTHON,null,-1,-1,"def pi():\n" +

                                "  import java.lang.Math\n" +

                                "  return java.lang.Math.PI");

        }

        public boolean isEnable() {

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

        }

        public String getTooltip(){

                return PluginServices.getText(this,"operator")+":  "+addText("")+"\n"+getDescription();

        }

        public String getDescription() {

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

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

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

        "The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter.";

    }

}