org.coliper.ibean.proxy.handler

Class NullSafeHandler

java.lang.Object

org.coliper.ibean.proxy.handler.StatelessExtensionHandler

org.coliper.ibean.proxy.handler.NullSafeHandler

All Implemented Interfaces:

ExtensionHandler

public class NullSafeHandler
extends StatelessExtensionHandler

ExtensionHandler implementation for bean extension interface NullSafe.

Field Summary

Fields

Modifier and Type	Field and Description
static ExtensionSupport	SUPPORT ExtensionSupport related to this handler supposed to be used when configuring extension handlers in IBeanFactorys, for example in ProxyIBeanFactory.Builder#withInterfaceSupport(ExtensionSupport).

Constructor Summary

Constructors

Constructor and Description
NullSafeHandler()

Method Summary

Modifier and Type	Method and Description
Object	interceptGetterCall(IBeanContext<?> context, IBeanFieldMetaInfo fieldMeta, Object returnValue, Object proxyInstance) Called as an optional hook with every getter call on an IBean.

Methods inherited from class org.coliper.ibean.proxy.handler.StatelessExtensionHandler

handleExtendedInterfaceCall

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.coliper.ibean.proxy.ExtensionHandler

interceptSetterCall, onInitStateful

Field Detail

SUPPORT

public static final ExtensionSupport SUPPORT

ExtensionSupport related to this handler supposed to be used when configuring extension handlers in IBeanFactorys, for example in ProxyIBeanFactory.Builder#withInterfaceSupport(ExtensionSupport).

Constructor Detail

NullSafeHandler

public NullSafeHandler()

Method Detail

interceptGetterCall

public Object interceptGetterCall(IBeanContext<?> context,
                                  IBeanFieldMetaInfo fieldMeta,
                                  Object returnValue,
                                  Object proxyInstance)

Description copied from interface: ExtensionHandler

Called as an optional hook with every getter call on an IBean. Getter calls on IBeans are handled by the IBean implementation itself but an ExtensionHandler can implement this method to hook into the getter call. It can just peak on the return value or it can even change it or throw an exception.

When you have several extension handlers registered for an IBean type the intercept calls will be called in the order in which the handlers are registered in the ProxyIBeanFactory. See also ProxyIBeanFactory.Builder.withInterfaceSupport(ExtensionSupport).

The default implementation just returns returnValue.

Parameters:

context - provides meta information about the IBean

fieldMeta - provides meta information about the field related to the getter

returnValue - the current return value of the getter. This must not match to the field value of the IBean as the value might have already been changed by intercept calls from other handlers

proxyInstance - the IBean instance itself

Returns:

the value to be returned from the getter call. If you do not want to change the getter return value just pass the value provided in returnValue