net.e6tech.elements.common.interceptor.SingletonClassBuilder Maven / Gradle / Ivy
/*
* Copyright 2015-2020 Futeh Kao
*
* Licensed 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 net.e6tech.elements.common.interceptor;
import net.e6tech.elements.common.util.SystemException;
import java.lang.reflect.Field;
import java.util.concurrent.ExecutionException;
@SuppressWarnings("unchecked")
public class SingletonClassBuilder extends AbstractBuilder, SingletonClassBuilder>{
private Class cls;
private T singleton;
public SingletonClassBuilder(Interceptor interceptor, Class cls, T singleton) {
super(interceptor, ctx -> ctx.invoke(singleton));
this.cls = cls;
this.singleton = singleton;
}
@Override
public Class build() {
if (singleton == null)
throw new IllegalArgumentException("target cannot be null");
try {
Class proxyClass = interceptor.singletonClasses.get(cls,
() -> interceptor.loadClass(interceptor.newSingletonBuilder(cls).make(), cls, classLoader));
Field field = proxyClass.getDeclaredField(Interceptor.HANDLER_FIELD);
field.setAccessible(true);
Interceptor.InterceptorHandlerWrapper wrapper = new Interceptor.InterceptorHandlerWrapper(interceptor,
proxyClass,
null,
singleton,
handler,
listener,
newObject);
field.set(null, wrapper);
return proxyClass;
} catch (ExecutionException e) {
throw new SystemException(e.getCause());
} catch (Exception e) {
throw new SystemException(e);
}
}
}