com.jaeksoft.searchlib.web.Version.java Source code

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Here is the source code for com.jaeksoft.searchlib.web.Version.java

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/**   
 * License Agreement for OpenSearchServer
 *
 * Copyright (C) 2011-2015 Emmanuel Keller / Jaeksoft
 * 
 * http://www.open-search-server.com
 * 
 * This file is part of OpenSearchServer.
 *
 * OpenSearchServer 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.
 *
 * OpenSearchServer 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 OpenSearchServer. 
 *  If not, see <http://www.gnu.org/licenses/>.
 **/

package com.jaeksoft.searchlib.web;

import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

import javax.servlet.ServletContext;

import org.apache.commons.lang3.StringUtils;

public class Version {

    private final String title;

    private final String version;

    private final String build;

    private final String updateUrl;

    private final String versionString;

    public Version(ServletContext servletContext) throws IOException {
        InputStream is = null;
        try {
            is = servletContext.getResourceAsStream("/META-INF/MANIFEST.MF");
            if (is != null) {
                Manifest manifest = new Manifest(is);
                Attributes attributes = manifest.getMainAttributes();
                title = attributes.getValue("Implementation-Title");
                version = attributes.getValue("Implementation-Version");
                build = attributes.getValue("Implementation-Build");
            } else {
                title = null;
                version = null;
                build = null;
            }
            updateUrl = toUpdateUrl();
            versionString = toVersionString();
        } finally {
            if (is != null)
                is.close();
        }
    }

    private String toUpdateUrl() throws UnsupportedEncodingException {
        StringBuilder sb = new StringBuilder("http://www.open-search-server.com/updatecheck?check");
        if (!StringUtils.isEmpty(version)) {
            sb.append("&v=");
            sb.append(URLEncoder.encode(version, "UTF-8"));
        }
        if (!StringUtils.isEmpty(build)) {
            sb.append("&b=");
            sb.append(URLEncoder.encode(build, "UTF-8"));
        }
        return sb.toString();
    }

    public String getUpdateUrl() {
        return updateUrl;
    }

    private String toVersionString() {
        StringBuilder sb = new StringBuilder();
        sb.append(StringUtils.isEmpty(title) ? "OpenSearchServer" : title);
        if (!StringUtils.isEmpty(version)) {
            sb.append(" v");
            sb.append(version);
        }
        if (!StringUtils.isEmpty(build)) {
            sb.append(" - build ");
            sb.append(build);
        }
        return sb.toString();
    }

    @Override
    public String toString() {
        return versionString;
    }
}