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 */
025public final class PackageHelper {
026    private static final Logger LOG = LoggerFactory.getLogger(PackageHelper.class);
027
028    private PackageHelper() {
029        // Utility Class
030    }
031
032    /**
033     * Returns true if the version number of the given package name can be found and is greater than or equal to the minimum version.
034     *
035     * For package names which include multiple dots, dots after the leftmost are removed. So for example a spring version of 2.5.1 
036     * is converted to 2.51 so you can assert that it's >= 2.51 (so above 2.50 and less than 2.52 etc).
037     *
038     * @param packageName the Java package name to compare
039     * @param minimumVersion the minimum version number
040     * @return true if the package name can be determined and if it's greater than or equal to the minimum value
041     */
042    public static boolean isValidVersion(String packageName, double minimumVersion) {
043        try {
044            Package spring = Package.getPackage(packageName);
045            if (spring != null) {
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                        StringBuilder buffer = new StringBuilder(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
062                    if (ObjectHelper.isNotEmpty(value)) {
063                        double number = Double.parseDouble(value);
064                        return number >= minimumVersion;
065                    } else {
066                        LOG.debug("Could not determine version of package: {}", packageName);
067                    }
068                }
069            }
070        } catch (Exception e) {
071            if (LOG.isDebugEnabled()) {
072                LOG.debug("Could not determine version of package: {}", packageName, e);
073            }
074        }
075
076        return true;
077    }
078}