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 */
017package org.apache.camel.util;
018
019import org.slf4j.Logger;
020import org.slf4j.LoggerFactory;
021
022/**
023 * Some helper methods for working with Java packages and versioning.
024 *
025 * @version 
026 */
027public final class PackageHelper {
028    private static final Logger LOG = LoggerFactory.getLogger(PackageHelper.class);
029
030    private PackageHelper() {
031        // Utility Class
032    }
033
034    /**
035     * Returns true if the version number of the given package name can be found and is greater than or equal to the minimum version.
036     *
037     * For package names which include multiple dots, dots after the leftmost are removed. So for example a spring version of 2.5.1 
038     * is converted to 2.51 so you can assert that it's >= 2.51 (so above 2.50 and less than 2.52 etc).
039     *
040     * @param packageName the Java package name to compare
041     * @param minimumVersion the minimum version number
042     * @return true if the package name can be determined and if it's greater than or equal to the minimum value
043     */
044    public static boolean isValidVersion(String packageName, double minimumVersion) {
045        try {
046            Package spring = Package.getPackage(packageName);
047            if (spring != null) {
048                String value = spring.getImplementationVersion();
049                if (value != null) {
050                    // lets remove any extra dots in the string...
051                    int idx = value.indexOf('.');
052                    if (idx >= 0) {
053                        StringBuilder buffer = new StringBuilder(value.substring(0, ++idx));
054                        int i = idx;
055                        for (int size = value.length(); i < size; i++) {
056                            char ch = value.charAt(i);
057                            if (Character.isDigit(ch)) {
058                                buffer.append(ch);
059                            }
060                        }
061                        value = buffer.toString();
062                    }
063
064                    if (ObjectHelper.isNotEmpty(value)) {
065                        double number = Double.parseDouble(value);
066                        return number >= minimumVersion;
067                    } else {
068                        LOG.debug("Could not determine version of package: {}", packageName);
069                    }
070                }
071            }
072        } catch (Exception e) {
073            if (LOG.isDebugEnabled()) {
074                LOG.debug("Could not determine version of package: " + packageName, e);
075            }
076        }
077
078        return true;
079    }
080}