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package com.waspring.framework.antenna.service;
import java.util.Arrays;
import java.util.List;
import com.waspring.framework.antenna.core.service.IService;
import com.waspring.framework.antenna.core.service.IServiceContainer;
import com.waspring.framework.antenna.core.service.ServiceException;
import com.waspring.framework.antenna.core.visitor.IRequest;
import com.waspring.framework.antenna.core.visitor.IResponse;
/**
* 服务包装策略，保护实际的服务类
*
* @author felly
*
*/
public class ServiceWrapper extends AbstractServiceContainer {
protected IService service;
public IService getService() {
return service;
}
@Override
public IService[] getServices() {
if (service == null)
return new IService[0];
return new IService[] { service };
}
/* ------------------------------------------------------------ */
/**
* 设置一个服务
*/
public void setService(IService service) {
// check for loops
if (service == this || (service instanceof IServiceContainer
&& Arrays.asList(((IServiceContainer) service).getChildServices()).contains(this)))
throw new IllegalStateException("setHandler loop");
this.service = service;
}
/**
* 插入服务
*
* @param wrapper
*/
public void insertService(ServiceWrapper wrapper) {
if (wrapper == null)
throw new IllegalArgumentException();
ServiceWrapper tail = wrapper;
while (tail.getService() instanceof ServiceWrapper)
tail = (ServiceWrapper) tail.getService();
if (tail.getService() != null)
throw new IllegalArgumentException("必须从链尾插入！");
IService next = getService();
setService(wrapper);
tail.setService(next);
}
@Override
public void service(IRequest request, IResponse reponse) throws Exception {
IService curService = service;
if (curService != null) {
curService.service(request, reponse);
}
}
/* ------------------------------------------------------------ */
@Override
protected void expandChildren(List list, Class byClass) {
expandHandler(service, list, byClass);
}
}