SerialSerialKeyCreator (Oracle - Berkeley DB Java API)
Keywords: com.sleepycat.bind.serial.SerialSerialKeyCreator class

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## com.sleepycat.bind.serial
Class SerialSerialKeyCreator

    java.lang.Object
      com.sleepycat.bind.serial.SerialSerialKeyCreator

All Implemented Interfaces:
  ForeignKeyNullifier, SecondaryKeyCreator

    public abstract class SerialSerialKeyCreator

extends Object
implements SecondaryKeyCreator, ForeignKeyNullifier

A abstract key creator that uses a serial key and a serial data entry. This class takes care of serializing and deserializing the key and data entry automatically. The following abstract method must be implemented by a concrete subclass to create the index key using these objects

- `createSecondaryKey(Object,Object)`

If `ForeignKeyDeleteAction.NULLIFY` was specified when opening the secondary database, the following method must be overridden to nullify the foreign index key. If NULLIFY was not specified, this method need not be overridden.

- `nullifyForeignKey(Object)`

Field Summary
`protected SerialBinding` | `dataBinding`
`protected SerialBinding` | `indexKeyBinding`
`protected SerialBinding` | `primaryKeyBinding`

Constructor Summary
`SerialSerialKeyCreator(ClassCatalog classCatalog, Class primaryKeyClass, Class dataClass, Class indexKeyClass)` Creates a serial-serial key creator.
`SerialSerialKeyCreator(SerialBinding primaryKeyBinding, SerialBinding dataBinding, SerialBinding indexKeyBinding)` Creates a serial-serial entity binding.

Method Summary
`abstract Object` | `createSecondaryKey(Object primaryKey, Object data)` Creates the index key object from primary key and entry objects.
`boolean` | `createSecondaryKey(SecondaryDatabase db, DatabaseEntry primaryKeyEntry, DatabaseEntry dataEntry, DatabaseEntry indexKeyEntry)` Creates a secondary key entry, given a primary key and data entry.
`Object` | `nullifyForeignKey(Object data)` Clears the index key in a data object.
`boolean` | `nullifyForeignKey(SecondaryDatabase db, DatabaseEntry dataEntry)`

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

Field Detail

### primaryKeyBinding

    protected SerialBinding primaryKeyBinding

### dataBinding

    protected SerialBinding dataBinding

### indexKeyBinding

    protected SerialBinding indexKeyBinding

Constructor Detail

### SerialSerialKeyCreator

    public SerialSerialKeyCreator(ClassCatalog classCatalog,
                                  Class primaryKeyClass,
                                  Class dataClass,
                                  Class indexKeyClass)

  Creates a serial-serial key creator.

  Parameters:
    `classCatalog` - is the catalog to hold shared class information and for a database should be a `StoredClassCatalog`.
    `primaryKeyClass` - is the primary key base class.
    `dataClass` - is the data base class.
    `indexKeyClass` - is the index key base class.

### SerialSerialKeyCreator

    public SerialSerialKeyCreator(SerialBinding primaryKeyBinding,
                                  SerialBinding dataBinding,
                                  SerialBinding indexKeyBinding)

  Creates a serial-serial entity binding.

  Parameters:
    `primaryKeyBinding` - is the primary key binding.
    `dataBinding` - is the data binding.
    `indexKeyBinding` - is the index key binding.

Method Detail

### createSecondaryKey

    public boolean createSecondaryKey(SecondaryDatabase db,
                                      DatabaseEntry primaryKeyEntry,
                                      DatabaseEntry dataEntry,
                                      DatabaseEntry indexKeyEntry)
                               throws DatabaseException

  Description copied from interface: `SecondaryKeyCreator`
  Creates a secondary key entry, given a primary key and data entry.

  A secondary key may be derived from the primary key, primary data, or a combination of the primary key and data. For secondary keys that are optional, the key creator method may return false and the key/data pair will not be indexed. To ensure the integrity of a secondary database the key creator method must always return the same result for a given set of input parameters.

  Specified by:
    `createSecondaryKey` in interface `SecondaryKeyCreator`
  Parameters:
    `db` - the database to which the secondary key will be added. This parameter is passed for informational purposes but is not commonly used.

    `primaryKeyEntry` - the primary key entry. This parameter must not be modified by this method.

    `dataEntry` - the primary data entry. This parameter must not be modified by this method.

    `indexKeyEntry` - the secondary key created by this method.

  Returns:
    true if a key was created, or false to indicate that the key is not present.

  Throws:
    `DatabaseException` - if an error occurs attempting to create the secondary key.

### nullifyForeignKey

    public boolean nullifyForeignKey(SecondaryDatabase db,
                                     DatabaseEntry dataEntry)
                              throws DatabaseException

  Specified by:
    `nullifyForeignKey` in interface `ForeignKeyNullifier`
  Throws:
    `DatabaseException`

### createSecondaryKey

    public abstract Object createSecondaryKey(Object primaryKey,
                                              Object data)

  Creates the index key object from primary key and entry objects.

  Parameters:
    `primaryKey` - is the deserialized source primary key entry, or null if no primary key entry is used to construct the index key.
    `data` - is the deserialized source data entry, or null if no data entry is used to construct the index key.
  Returns:
    the destination index key object, or null to indicate that the key is not present.

### nullifyForeignKey

    public Object nullifyForeignKey(Object data)

  Clears the index key in a data object.

  On entry the data parameter contains the index key to be cleared. It should be changed by this method such that `createSecondaryKey(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)` will return false. Other fields in the data object should remain unchanged.

  Parameters:
    `data` - is the source and destination data object.
  Returns:
    the destination data object, or null to indicate that the key is not present and no change is necessary. The data returned may be the same object passed as the data parameter or a newly created object.

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