com.atomiton.watermanagement.ngo.util.WaterMgmtNGOUtility.java Source code

Introduction

Here is the source code for com.atomiton.watermanagement.ngo.util.WaterMgmtNGOUtility.java

Source

// Copyright 2010-2014 Oleg Danilov (a.k.a ODA, Novos40) under the terms of 
// the MIT license found at http://www.opensource.org/licenses/mit-license.html
package com.atomiton.watermanagement.ngo.util;

import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.json.JSONObject;
import org.json.XML;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class WaterMgmtNGOUtility {

    public static String getXMLElementValue(String tagName, String xmlString) {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(new InputSource(new StringReader(xmlString)));
            Element rootElement = document.getDocumentElement();
            String rootElementTagName = rootElement.getTagName();
            if (rootElementTagName.equalsIgnoreCase(tagName)) {
                return rootElement.getTextContent();
            } else {
                NodeList list = rootElement.getElementsByTagName(tagName);
                if (list != null && list.getLength() > 0) {
                    NodeList subList = list.item(0).getChildNodes();
                    if (subList != null && subList.getLength() > 0) {
                        return subList.item(0).getNodeValue();
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static JSONObject convertXMLToJSON(String xmlStr) {
        return XML.toJSONObject(xmlStr);
    }

    public static double getDistance(double lat1, double lon1, double lat2, double lon2) {
        int R = 6371;
        double phi1 = deg2rad(lat1);
        double phi2 = deg2rad(lat2);
        double lambda1 = deg2rad(lon1);
        double lambda2 = deg2rad(lon2);

        double x = (lambda2 - lambda1) * Math.cos((phi1 + phi2) / 2.0);
        double y = phi2 - phi1;
        double distKm = Math.sqrt(x * x + y * y) * R;

        //return distKm / 1.60934; // in miles
        return distKm;
    }

    public static double deg2rad(double deg) {
        return deg * (Math.PI / 180);
    }
}