| /* |
| * 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.logging.log4j.plugins.processor; |
| |
| import java.io.BufferedInputStream; |
| import java.io.BufferedOutputStream; |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.net.URL; |
| import java.util.Enumeration; |
| import java.util.Map; |
| import java.util.TreeMap; |
| |
| /** |
| * |
| */ |
| public class PluginCache { |
| private final Map<String, Map<String, PluginEntry>> categories = |
| new TreeMap<>(); |
| |
| /** |
| * Returns all categories of plugins in this cache. |
| * |
| * @return all categories of plugins in this cache. |
| * @since 2.1 |
| */ |
| public Map<String, Map<String, PluginEntry>> getAllCategories() { |
| return categories; |
| } |
| |
| /** |
| * Gets or creates a category of plugins. |
| * |
| * @param category name of category to look up. |
| * @return plugin mapping of names to plugin entries. |
| */ |
| public Map<String, PluginEntry> getCategory(final String category) { |
| final String key = category.toLowerCase(); |
| if (!categories.containsKey(key)) { |
| categories.put(key, new TreeMap<String, PluginEntry>()); |
| } |
| return categories.get(key); |
| } |
| |
| /** |
| * Loads and merges all the Log4j plugin cache files specified. Usually, this is obtained via a ClassLoader. |
| * |
| * @param resources URLs to all the desired plugin cache files to load. |
| * @throws IOException if an I/O exception occurs. |
| */ |
| public void loadCacheFiles(final Enumeration<URL> resources) throws IOException { |
| categories.clear(); |
| while (resources.hasMoreElements()) { |
| final URL url = resources.nextElement(); |
| try (final DataInputStream in = new DataInputStream(new BufferedInputStream(url.openStream()))) { |
| final int count = in.readInt(); |
| for (int i = 0; i < count; i++) { |
| final String category = in.readUTF(); |
| final Map<String, PluginEntry> m = getCategory(category); |
| final int entries = in.readInt(); |
| for (int j = 0; j < entries; j++) { |
| final PluginEntry entry = new PluginEntry(); |
| entry.setKey(in.readUTF()); |
| entry.setClassName(in.readUTF()); |
| entry.setName(in.readUTF()); |
| entry.setPrintable(in.readBoolean()); |
| entry.setDefer(in.readBoolean()); |
| entry.setCategory(category); |
| if (!m.containsKey(entry.getKey())) { |
| m.put(entry.getKey(), entry); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Gets the number of plugin categories registered. |
| * |
| * @return number of plugin categories in cache. |
| */ |
| public int size() { |
| return categories.size(); |
| } |
| } |