| // *************************************************************************************************************************** |
| // * 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.juneau.config.store; |
| |
| import static org.apache.juneau.internal.StringUtils.*; |
| |
| import java.io.*; |
| import java.util.concurrent.*; |
| |
| import org.apache.juneau.*; |
| import org.apache.juneau.internal.*; |
| |
| /** |
| * Classpath-based storage location for configuration files. |
| * |
| * <p> |
| * Looks inside the JVM classpath for configuration files. |
| * |
| * <p> |
| * Configuration files retrieved from the classpath can be modified but not persisted. |
| */ |
| public class ConfigClasspathStore extends ConfigStore { |
| |
| //------------------------------------------------------------------------------------------------------------------- |
| // Predefined instances |
| //------------------------------------------------------------------------------------------------------------------- |
| |
| /** Default memory store, all default values.*/ |
| public static final ConfigClasspathStore DEFAULT = ConfigClasspathStore.create().build(); |
| |
| |
| //------------------------------------------------------------------------------------------------------------------- |
| // Instance |
| //------------------------------------------------------------------------------------------------------------------- |
| |
| /** |
| * Create a new builder for this object. |
| * |
| * @return A new builder for this object. |
| */ |
| public static ConfigClasspathStoreBuilder create() { |
| return new ConfigClasspathStoreBuilder(); |
| } |
| |
| @Override /* Context */ |
| public ConfigClasspathStoreBuilder builder() { |
| return new ConfigClasspathStoreBuilder(getPropertyStore()); |
| } |
| |
| private final ConcurrentHashMap<String,String> cache = new ConcurrentHashMap<>(); |
| |
| /** |
| * Constructor. |
| * |
| * @param ps The settings for this content store. |
| */ |
| protected ConfigClasspathStore(PropertyStore ps) { |
| super(ps); |
| } |
| |
| @Override /* ConfigStore */ |
| public synchronized String read(String name) throws IOException { |
| String s = cache.get(name); |
| if (s != null) |
| return s; |
| |
| ClassLoader cl = Thread.currentThread().getContextClassLoader(); |
| try (InputStream in = cl.getResourceAsStream(name)) { |
| if (in != null) |
| cache.put(name, IOUtils.read(in, IOUtils.UTF8)); |
| } |
| return emptyIfNull(cache.get(name)); |
| } |
| |
| @Override /* ConfigStore */ |
| public synchronized String write(String name, String expectedContents, String newContents) throws IOException { |
| |
| // This is a no-op. |
| if (isEquals(expectedContents, newContents)) |
| return null; |
| |
| String currentContents = read(name); |
| |
| if (expectedContents != null && ! isEquals(currentContents, expectedContents)) |
| return currentContents; |
| |
| update(name, newContents); |
| |
| return null; |
| } |
| |
| @Override /* ConfigStore */ |
| public synchronized boolean exists(String name) { |
| try { |
| return ! read(name).isEmpty(); |
| } catch (IOException e) { |
| return false; |
| } |
| } |
| |
| @Override /* ConfigStore */ |
| public synchronized ConfigClasspathStore update(String name, String newContents) { |
| if (newContents == null) |
| cache.remove(name); |
| else |
| cache.put(name, newContents); |
| super.update(name, newContents); |
| return this; |
| } |
| |
| /** |
| * No-op. |
| */ |
| @Override /* Closeable */ |
| public void close() throws IOException { |
| // No-op |
| } |
| } |