com.titankingdoms.dev.titanchat.util.update.Update.java Source code

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Here is the source code for com.titankingdoms.dev.titanchat.util.update.Update.java

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/*
 *     Copyright (C) 2013  Nodin Chan <nodinchan@live.com>
 *     
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *     
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *     
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package com.titankingdoms.dev.titanchat.util.update;

import java.net.URL;

import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.commons.lang.math.NumberUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

public final class Update {

    private final String rss;
    private final String currentVersion;
    private String newVersion;

    public Update(String rss, String currentVersion) {
        this.rss = rss;
        this.currentVersion = currentVersion;
    }

    public String check() {
        try {
            URL url = new URL(rss);

            Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(url.openStream());
            doc.getDocumentElement().normalize();

            Node node = doc.getElementsByTagName("item").item(0);

            if (node.getNodeType() == 1) {
                Node name = ((Element) node).getElementsByTagName("title").item(0);
                Node version = name.getChildNodes().item(0);
                newVersion = version.getNodeValue().replaceAll("[^\\d\\.]", "");

            } else {
                newVersion = currentVersion;
            }

        } catch (Exception e) {
            newVersion = currentVersion;
        }

        return newVersion;
    }

    public String getCurrentVersion() {
        return currentVersion;
    }

    public String getNewVersion() {
        return newVersion;
    }

    public boolean isNew(String newVersion) {
        String[] currentDigits = currentVersion.split("\\.");
        String[] newDigits = newVersion.split("\\.");

        for (int digit = 0; digit < Math.max(currentDigits.length, newDigits.length); digit++) {
            String currentDigitString = (currentDigits.length > digit) ? currentDigits[digit] : "0";
            String newDigitString = (newDigits.length > digit) ? newDigits[digit] : "0";

            if (!NumberUtils.isNumber(currentDigitString) || !NumberUtils.isNumber(newDigitString))
                continue;

            int currentDigit = NumberUtils.toInt(currentDigitString);
            int newDigit = NumberUtils.toInt(newDigitString);

            if (newDigit > currentDigit)
                return true;

            if (newDigit < currentDigit)
                break;
        }

        return false;
    }

    public boolean verify() {
        return isNew(check());
    }
}