/*
* 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 jakarta.el;
import jakarta.el.BeanELResolver.BeanProperties;
/*
* Provides an abstraction so the BeanELResolver can obtain JavaBeans specification support via different
* implementations.
*/
abstract class BeanSupport {
private static final BeanSupport beanSupport;
static {
// Only intended for unit tests. Not intended to be part of public API.
boolean doNotCacheInstance = Boolean.getBoolean("jakarta.el.BeanSupport.doNotCacheInstance");
if (doNotCacheInstance) {
beanSupport = null;
} else {
beanSupport = createInstance();
}
}
private static BeanSupport createInstance() {
// Only intended for unit tests. Not intended to be part of public API.
boolean useFull = !Boolean.getBoolean("jakarta.el.BeanSupport.useStandalone");
if (useFull) {
// If not explicitly configured to use standalone, use the full implementation unless it is not available.
try {
Class.forName("java.beans.BeanInfo");
} catch (Exception e) {
// Ignore: Expected if using modules and java.desktop module is not present
useFull = false;
}
}
if (useFull) {
// The full implementation provided by the java.beans package
return new BeanSupportFull();
} else {
// The cut-down local implementation that does not depend on the java.beans package
return new BeanSupportStandalone();
}
}
static BeanSupport getInstance() {
if (beanSupport == null) {
return createInstance();
}
return beanSupport;
}
abstract BeanProperties getBeanProperties(Class<?> type);
}