| gvSIG desktop 1

package com.iver.cit.gvsig.project.documents.table.operators;

import org.apache.bsf.BSFException;

import org.apache.bsf.BSFManager;

import com.iver.andami.PluginServices;

import com.iver.cit.gvsig.ExpressionFieldExtension;

import com.iver.cit.gvsig.project.documents.table.AbstractOperator;

import com.iver.cit.gvsig.project.documents.table.IOperator;

/**

 *

 * @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(ExpressionFieldExtension.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 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 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.";

    }

}