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                # 4.5\. 元組片斷映射(Tuplizers) `org.hibernate.tuple.Tuplizer`,以及其子接口,負責根據給定的`org.hibernate.EntityMode`,來復現片斷數據。如果給定的片斷數據被認為其是一種數據結構,"tuplizer"就是一個知道如何創建這樣的數據結構,以及如何給這個數據結構賦值的東西。比如說,對于POJO這種Entity Mode,對應的tuplizer知道通過其構造方法來創建一個POJO,再通過其屬性訪問器來訪問POJO屬性。有兩大類高層Tuplizer,分別是`org.hibernate.tuple.entity.EntityTuplizer` 和`org.hibernate.tuple.entity.ComponentTuplizer`接口。`EntityTuplizer`負責管理上面提到的實體的契約,而`ComponentTuplizer`則是針對組件的。 用戶也可以插入其自定義的tuplizer。或許您需要一種不同于dynamic-map entity-mode中使用的`java.util.HashMap`的`java.util.Map`實現;或許您需要與默認策略不同的代理生成策略(proxy generation strategy)。通過自定義tuplizer實現,這兩個目標您都可以達到。Tuplizer定義被附加到它們期望管理的entity或者component映射中。回到我們的customer entity例子: ``` <hibernate-mapping> <class entity-name="Customer"> <!-- Override the dynamic-map entity-mode tuplizer for the customer entity --> <tuplizer entity-mode="dynamic-map" class="CustomMapTuplizerImpl"/> <id name="id" type="long" column="ID"> <generator class="sequence"/> </id> <!-- other properties --> ... </class> </hibernate-mapping> public class CustomMapTuplizerImpl extends org.hibernate.tuple.entity.DynamicMapEntityTuplizer { // override the buildInstantiator() method to plug in our custom map... protected final Instantiator buildInstantiator( org.hibernate.mapping.PersistentClass mappingInfo) { return new CustomMapInstantiator( mappingInfo ); } private static final class CustomMapInstantiator extends org.hibernate.tuple.DynamicMapInstantitor { // override the generateMap() method to return our custom map... protected final Map generateMap() { return new CustomMap(); } } } ```
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