javax.json.bind.spi.JsonbProvider Maven / Gradle / Ivy
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* 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) () -> 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) () -> 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();
}
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