| /** |
| * 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.spring.boot; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarInputStream; |
| |
| import org.apache.camel.impl.DefaultPackageScanClassResolver; |
| import org.apache.camel.util.IOHelper; |
| |
| /** |
| * An implementation of the {@code org.apache.camel.spi.PackageScanClassResolver} that is able to |
| * scan spring-boot fat jars to find classes contained also in nested jars. |
| */ |
| public class FatJarPackageScanClassResolver extends DefaultPackageScanClassResolver { |
| |
| private static final String SPRING_BOOT_CLASSIC_LIB_ROOT = "lib/"; |
| private static final String SPRING_BOOT_BOOT_INF_LIB_ROOT = "BOOT-INF/lib/"; |
| private static final String SPRING_BOOT_BOOT_INF_CLASSES_ROOT = "BOOT-INF/classes/"; |
| |
| /** |
| * Loads all the class entries from the main JAR and all nested jars. |
| * |
| * @param stream the inputstream of the jar file to be examined for classes |
| * @param urlPath the url of the jar file to be examined for classes |
| * @return all the .class entries from the main JAR and all nested jars |
| */ |
| @Override |
| protected List<String> doLoadJarClassEntries(InputStream stream, String urlPath) { |
| return doLoadJarClassEntries(stream, urlPath, true, true); |
| } |
| |
| protected List<String> doLoadJarClassEntries(InputStream stream, String urlPath, boolean inspectNestedJars, boolean closeStream) { |
| List<String> entries = new ArrayList<>(); |
| |
| JarInputStream jarStream = null; |
| try { |
| jarStream = new JarInputStream(stream); |
| |
| JarEntry entry; |
| while ((entry = jarStream.getNextJarEntry()) != null) { |
| String name = entry.getName(); |
| |
| if (name != null) { |
| name = name.trim(); |
| if (!entry.isDirectory() && name.endsWith(".class")) { |
| entries.add(cleanupSpringbootClassName(name)); |
| } else if (inspectNestedJars && !entry.isDirectory() && isSpringBootNestedJar(name)) { |
| String nestedUrl = urlPath + "!/" + name; |
| log.trace("Inspecting nested jar: {}", nestedUrl); |
| |
| List<String> nestedEntries = doLoadJarClassEntries(jarStream, nestedUrl, false, false); |
| entries.addAll(nestedEntries); |
| } |
| } |
| } |
| } catch (IOException ioe) { |
| log.warn("Cannot search jar file '" + urlPath + " due to an IOException: " + ioe.getMessage() + ". This exception is ignored.", ioe); |
| } finally { |
| if (closeStream) { |
| // stream is left open when scanning nested jars, otherwise the fat jar stream gets closed |
| IOHelper.close(jarStream, urlPath, log); |
| } |
| } |
| |
| return entries; |
| } |
| |
| private boolean isSpringBootNestedJar(String name) { |
| // Supporting both versions of the packaging model |
| return name.endsWith(".jar") && (name.startsWith(SPRING_BOOT_CLASSIC_LIB_ROOT) || name.startsWith(SPRING_BOOT_BOOT_INF_LIB_ROOT)); |
| } |
| |
| private String cleanupSpringbootClassName(String name) { |
| // Classes inside BOOT-INF/classes will be loaded by the new classloader as if they were in the root |
| if (name.startsWith(SPRING_BOOT_BOOT_INF_CLASSES_ROOT)) { |
| name = name.substring(SPRING_BOOT_BOOT_INF_CLASSES_ROOT.length()); |
| } |
| return name; |
| } |
| |
| } |