| /* |
| * 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 javax.json.bind.spi; |
| |
| import javax.json.bind.JsonbBuilder; |
| import javax.json.bind.JsonbException; |
| import java.lang.reflect.Method; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.List; |
| import java.util.ServiceLoader; |
| |
| public abstract class JsonbProvider { |
| private static final String DEFAULT_PROVIDER = "org.apache.johnzon.jsonb.JohnzonProvider"; |
| |
| public static JsonbProvider provider() { |
| if (System.getSecurityManager() != null) { |
| return AccessController.doPrivileged((PrivilegedAction<JsonbProvider>) () -> doLoadProvider(null)); |
| } |
| return doLoadProvider(null); |
| } |
| |
| public static JsonbProvider provider(final String providerFqn) { |
| if (providerFqn == null) { |
| throw new IllegalArgumentException(); |
| } |
| |
| if (System.getSecurityManager() != null) { |
| return AccessController.doPrivileged((PrivilegedAction<JsonbProvider>) () -> doLoadProvider(providerFqn)); |
| } |
| return doLoadProvider(providerFqn); |
| } |
| |
| private static JsonbProvider doLoadProvider(final String providerFqn) { |
| for (final JsonbProvider provider : ServiceLoader.load(JsonbProvider.class)) { |
| if (providerFqn == null) { |
| return provider; |
| } |
| else if (providerFqn.equals(provider.getClass().getName())) { |
| return provider; |
| } |
| } |
| |
| if (providerFqn != null) { |
| final String msg = providerFqn + " not found"; |
| throw new JsonbException(msg, new ClassNotFoundException(msg)); |
| } |
| |
| try { |
| return JsonbProvider.class.cast(Thread.currentThread().getContextClassLoader().loadClass(DEFAULT_PROVIDER).newInstance()); |
| } catch (final ClassNotFoundException cnfe) { |
| throw new JsonbException(DEFAULT_PROVIDER + " not found", cnfe); |
| } catch (final Exception x) { |
| throw new JsonbException(DEFAULT_PROVIDER + " couldn't be instantiated: " + x, x); |
| } |
| } |
| |
| |
| public abstract JsonbBuilder create(); |
| } |