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## org.infinispan.schematic.internal
Class SchematicExternalizer<T>

    java.lang.Object
      org.infinispan.schematic.internal.SchematicExternalizer<T>

Type Parameters:
  `T` - the type of class

All Implemented Interfaces:
  Serializable, org.infinispan.marshall.Externalizer<T>

Direct Known Subclasses:
  AddValueIfAbsentOperation.Externalizer, AddValueOperation.Externalizer, Binary.Externalizer, ClearOperation.Externalizer, Code.Externalizer, DocumentExternalizer, MaxKey.Externalizer, MinKey.Externalizer, Null.Externalizer, ObjectId.Externalizer, Paths.Externalizer, PutIfAbsentOperation.Externalizer, PutOperation.Externalizer, RemoveAllValuesOperation.Externalizer, RemoveAtIndexOperation.Externalizer, RemoveOperation.Externalizer, RemoveValueOperation.Externalizer, RetainAllValuesOperation.Externalizer, SchematicEntryDelta.Externalizer, SchematicEntryLiteral.Externalizer, SetValueOperation.Externalizer, Symbol.Externalizer, Timestamp.Externalizer

    public abstract class SchematicExternalizer<T>

extends Object
implements org.infinispan.marshall.Externalizer<T>

An abstract base class for all Schematic `Externalizer` implementations.

There are two primary advantages of implementing `AdvancedExternalizer` versus implementing `Externalizer`:

1. The class to be externalized must be modified with a `@SerializeWith` annotation. Since `SchematicEntryLiteral` is our class, this is possible.
2. The generated payloads (shipped between Infinispan processes) are slightly smaller, since it includes only the `AdvancedExternalizer`'s `identifier` instead of the class information and/or the serialized `Externalizer`. But for this to work, the advanced externalizers need to be registered with the cache container at startup.

Unfortunately, Infinispan in AS7.1 does not allow defining `AdvancedExternalizer` classes for the cache container, and thus they cannot be used (see MODE-1524 for details). Therefore, we have to rely only upon implementing `Externalizer`.

This abstract class was created so that the Schematic externalizers can easily extend it, but so that we can encapsulate in this abstract class the use of `Externalizer` or `AdvancedExternalizer`. Once Infinispan in AS7 supports user-defined advanced externalizers, then we can simply change this class to implement `AdvancedExternalizer` rather than `Externalizer`.

See Also:
  Serialized Form

Constructor Summary
`SchematicExternalizer()`

Method Summary
`abstract Integer` | `getId()`
`abstract Set<Class<? extends T>>` | `getTypeClasses()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.infinispan.marshall.Externalizer
`readObject, writeObject`

Constructor Detail

### SchematicExternalizer

    public SchematicExternalizer()

Method Detail

### getId

    public abstract Integer getId()

### getTypeClasses

    public abstract Set<Class<? extends T>> getTypeClasses()

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