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Groovy example source code file (ReleaseInfo.java)

This example Groovy source code file (ReleaseInfo.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

bundleversion, classloader, implementationversion, inputstream, io, key_build_date, key_implementation_version, net, network, properties, properties, release_info, release_info, string, string, urlclassloader, urlclassloader, util

The Groovy ReleaseInfo.java source code

/*
 * Copyright 2003-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.util;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Properties;

/**
 * Exposes the Groovy release information 
 * 
 * @author Roshan Dawrani
 */
public class ReleaseInfo {
    private static final Properties RELEASE_INFO = new Properties();
    private static final String RELEASE_INFO_FILE = "META-INF/groovy-release-info.properties";
    private static final String KEY_IMPLEMENTATION_VERSION = "ImplementationVersion";
    private static final String KEY_BUNDLE_VERSION = "BundleVersion";
    private static final String KEY_BUILD_DATE = "BuildDate";
    private static final String KEY_BUILD_TIME = "BuildTime";

    static {
        URL url = null;
        ClassLoader cl = ReleaseInfo.class.getClassLoader();
        // we need no security check for getting the system class
        // loader since if we do the invoker has a null loader,
        // in which case no security check will be done
        if (cl == null) cl = ClassLoader.getSystemClassLoader();
        if (cl instanceof URLClassLoader) {
            // this avoids going through the parent classloaders/bootstrap
            url = ((URLClassLoader) cl).findResource(RELEASE_INFO_FILE);
        } else {
            // fallback option as ClassLoader#findResource() is protected
            url = cl.getResource(RELEASE_INFO_FILE);
        }
        if (url != null) {
            try {
                InputStream is = url.openStream();
                if(is != null) {
                    RELEASE_INFO.load(is);
                }
            } catch(IOException ioex) {
                // ignore. In case of some exception, release info is not available
            }
        }
    }
    
    public static String getVersion() {
        return get(KEY_IMPLEMENTATION_VERSION);
    }
    
    public static Properties getAllProperties() {
        return RELEASE_INFO;
    }
    
    private static String get(String propName) {
        String propValue = RELEASE_INFO.getProperty(propName);
        return (propValue == null ? "" : propValue);
    }
}

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