| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.camel.catalog; |
| |
| import java.io.InputStream; |
| import java.util.Properties; |
| |
| /** |
| * To get the version of this catalog. |
| */ |
| public class VersionHelper { |
| |
| private static volatile String version; |
| |
| public synchronized String getVersion() { |
| if (version != null) { |
| return version; |
| } |
| InputStream is = null; |
| // try to load from maven properties first |
| try { |
| Properties p = new Properties(); |
| is = getClass().getResourceAsStream("/META-INF/maven/org.apache.camel/camel-catalog/pom.properties"); |
| if (is != null) { |
| p.load(is); |
| version = p.getProperty("version", ""); |
| } |
| } catch (Exception e) { |
| // ignore |
| } finally { |
| if (is != null) { |
| try { |
| is.close(); |
| } catch (Exception e) { |
| // ignore |
| } |
| } |
| } |
| |
| // fallback to using Java API |
| if (version == null) { |
| Package aPackage = getClass().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 = ""; |
| } |
| |
| return version; |
| } |
| |
| } |