001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.camel.util; 018 019 import org.apache.commons.logging.Log; 020 import org.apache.commons.logging.LogFactory; 021 022 /** 023 * Some helper methods for working with Java packages and versioning. 024 * 025 * @version $Revision: 640438 $ 026 */ 027 public final class PackageHelper { 028 public static final transient Log LOG = LogFactory.getLog(PackageHelper.class); 029 private PackageHelper() { 030 // Utility Class 031 } 032 033 /** 034 * Returns true if the version number of the given package name can be found and is greater than or equal to the minimum version. 035 * 036 * For package names which include multiple dots, the dots are removed. So for example a spring version of 2.5.1 is converted to 037 * 2.51 so you can assert that its >= 2.51 (so above 2.50 and less than 2.52 etc). 038 * 039 * @param packageName the Java package name to compare 040 * @param minimumVersion the minimum version number 041 * @return true if the package name can be determined and if its greater than or equal to the minimum value 042 */ 043 public static boolean isValidVersion(String packageName, double minimumVersion) { 044 try { 045 Package spring = Package.getPackage(packageName); 046 String value = spring.getImplementationVersion(); 047 if (value != null) { 048 // lets remove any extra dots in the string... 049 int idx = value.indexOf('.'); 050 if (idx >= 0) { 051 StringBuffer buffer = new StringBuffer(value.substring(0, ++idx)); 052 int i = idx; 053 for (int size = value.length(); i < size; i++) { 054 char ch = value.charAt(i); 055 if (Character.isDigit(ch)) { 056 buffer.append(ch); 057 } 058 } 059 value = buffer.toString(); 060 } 061 Double number = Double.parseDouble(value); 062 return number >= minimumVersion; 063 } 064 } catch (Exception e) { 065 LOG.debug("Failed to find out " + packageName + " version: " + e, e); 066 } 067 return true; 068 } 069 }