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;

/**

 * 

 * @author Vicente Caballero Navarro

 */

public class Abs extends AbstractOperator {

        public String addText(String s) {

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

        }

        public String toString() {

                return "abs";

        }

        public void eval(BSFManager interpreter) throws BSFException {

                interpreter.exec(EvalOperatorsTask.JYTHON, null, -1, -1,

                                "def abs(value):\n" + "  import java.lang.Math\n"

                                                + "  return java.lang.Math.abs(value)\n");

        }

        public boolean isEnable() {

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

        }

        public double abs(double value) {

                return java.lang.Math.abs(value);

        }

        public String getDescription() {

                return "parameter"

                                + ": "

                                + "numeric_value"

                                + "\n"

                                + "returns"

                                + ": "

                                + "numeric_value"

                                + "\n"

                                + "description"

                                + ": "

                                + "Returns the absolute value of a double value. If the argument is not negative, the argument is returned. "

                                + "If the argument is negative, the negation of the argument is returned.\n "

                                + "Special cases:\n"

                                + "* If the argument is positive zero or negative zero, the result is positive zero.\n"

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

                                + "* If the argument is NaN, the result is NaN.";

        }

}