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Java Source Code / Java Documentation » Testing » PolePosition 0.20 » com.versant.core.jdo.externalizer

Source Cross Reference

Class Diagram

Java Document (Java Doc)

com.versant.core.jdo.externalizer .Externalizer

All known Subclasses:   com.versant.core.jdo.externalizer .SerializedExternalizer,  com.versant.core.jdo.externalizer .TypeAsStringExternalizer,  com.versant.core.jdo.externalizer .TypeAsBytesExternalizer,
Externalizer
public interface Externalizer (Code)
Externalizers convert an object to/from some other object for storage. This is done when the object is stored/retrieved from the data store. The transformation takes place on the "client side" in the context of a PersistenceManager so references to PC instances can be converted into OIDs and so on.
If the class implementing this Interface has a constructor that accepts a single Class argument then this will be invoked with the target field type. Throw an IllegalArgumentException if this type is not suitable. Otherwise the default constructor is used.
See Also:   SerializedExternalizer
See Also:   TypeAsBytesExternalizer
See Also:   TypeAsStringExternalizer

Method Summary
public Object fromExternalForm(PersistenceManager pm, Object o)
     Create from an object read from storage.
public Class getExternalType()
     Return the class that we convert to/from.
public Object toExternalForm(PersistenceManager pm, Object o)
     Convert to an object for storage.

Method Detail
fromExternalForm
public Object fromExternalForm(PersistenceManager pm, Object o)(Code)
Create from an object read from storage.

getExternalType
public Class getExternalType()(Code)
Return the class that we convert to/from. This is used to decide how to map the field (e.g. what sort of database column to create).

toExternalForm
public Object toExternalForm(PersistenceManager pm, Object o)(Code)
Convert to an object for storage.

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