Platform.java

/**
 * Copyright (C) 2011-2015 The XDocReport Team <xdocreport@googlegroups.com>
 *
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package fr.opensagres.xdocreport.core;

import java.io.InputStream;
import java.util.Properties;

public abstract class Platform {

	private static String version;
	public static String getVersion() {
		if (version != null) {
	        return version;
	    }

	    // try to load from maven properties first
	    try {
	        Properties p = new Properties();
	        InputStream is = ClassLoader.getSystemResourceAsStream("META-INF/maven/fr.opensagres.xdocreport/fr.opensagres.xdocreport.core/pom.properties");
	        if (is != null) {
	            p.load(is);
	            version = p.getProperty("version", "");
	        }
	    } catch (Exception e) {
	        // ignore
	    }

	    // fallback to using Java API
	    if (version == null) {
	        Package aPackage = Platform.class.getPackage();
	        if (aPackage != null) {
	            version = aPackage.getImplementationVersion();
	            if (version == null) {
	                version = aPackage.getSpecificationVersion();
	            }
	        }
	    }

	    if (version == null) {
	        // we could not compute the version so use a blank
	        version = "not found";
	    }

	    return version;
	} 

}