| // Copyright 2007, 2008 The Apache Software Foundation |
| // |
| // 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.apache.tapestry5; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Properties; |
| |
| /** |
| * Utility methods related to managing framework version numbers. |
| */ |
| public class VersionUtils |
| { |
| |
| /** |
| * Reads a version number from a properties file on the classpath. These files are generally created by Maven. For |
| * example, tapestry-core's properties file is <code>META-INF/maven/org.apache.tapestry/tapestry-core/pom.properties</code>. |
| * The Maven generated properties files include the artifact id and group id as well as the version. |
| * <p/> |
| * The resource is located using the Thread's context class loader. |
| * |
| * @param resourcePath the complete path to the resource, including a leading slash. |
| * @return the version number read from the properties file, or "UNKNOWN" if the version number is not present or |
| * the file can not be opened |
| */ |
| public static String readVersionNumber(String resourcePath) |
| { |
| String result = "UNKNOWN"; |
| |
| InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream( |
| resourcePath); |
| |
| |
| if (stream != null) |
| { |
| Properties properties = new Properties(); |
| |
| |
| try |
| { |
| stream = new BufferedInputStream(stream); |
| |
| properties.load(stream); |
| } |
| catch (IOException ex) |
| { |
| // Just ignore it. |
| } |
| |
| String version = properties.getProperty("version"); |
| |
| // Since the file, if it exists, is created by Maven and will have the key, I can't see |
| // how version would EVER be null, unless there's a problem reading the properties. |
| |
| if (version != null) result = version; |
| } |
| |
| return result; |
| } |
| } |