public abstract class SerialSerialKeyCreator<PK,D,SK> extends Object implements SecondaryKeyCreator, ForeignKeyNullifier
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.
|Modifier and Type||Field and Description|
|Constructor and Description|
Creates a serial-serial key creator.
Creates a serial-serial entity binding.
|Modifier and Type||Method and Description|
Creates the index key object from primary key and data objects.
Creates a secondary key entry, given a primary key and data entry.
Clears the index key in a data object.
Sets the foreign key reference to null in the datum of the primary database.
public SerialSerialKeyCreator(ClassCatalog classCatalog, Class<PK> primaryKeyClass, Class<D> dataClass, Class<SK> indexKeyClass)
classCatalog- is the catalog to hold shared class information and for a database should be a
primaryKeyClass- is the primary key base class.
dataClass- is the data base class.
indexKeyClass- is the index key base class.
public SerialSerialKeyCreator(SerialBinding<PK> primaryKeyBinding, SerialBinding<D> dataBinding, SerialBinding<SK> indexKeyBinding)
primaryKeyBinding- is the primary key binding.
dataBinding- is the data binding.
indexKeyBinding- is the index key binding.
public boolean createSecondaryKey(SecondaryDatabase db, DatabaseEntry primaryKeyEntry, DatabaseEntry dataEntry, DatabaseEntry indexKeyEntry)
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.
RuntimeException may be thrown by this method if an error
occurs attempting to create the secondary key. This exception will be
thrown by the API method currently in progress, for example, a
put method. However, this will cause the write operation
to be incomplete. When databases are not configured to be
transactional, caution should be used to avoid integrity problems. See
Special considerations for
using Secondary Databases with and without Transactions.
db- the database to which the secondary key will be added. This parameter is passed for informational purposes but is not commonly used. This parameter is always non-null.
primaryKeyEntry- the primary key entry. This parameter must not be modified by this method. This parameter is always non-null.
dataEntry- the primary data entry. This parameter must not be modified by this method. If
SecondaryConfig#setExtractFromPrimaryKeyOnlyis configured as
dataparam may be either null or non-null, and the implementation is expected to ignore it; otherwise, this parameter is always non-null.
indexKeyEntry- the secondary key created by this method. This parameter is always non-null.
public boolean nullifyForeignKey(SecondaryDatabase db, DatabaseEntry dataEntry)
db- the database in which the foreign key integrity constraint is defined. This parameter is passed for informational purposes but is not commonly used.
dataEntry- the existing primary datum in which the foreign key reference should be set to null. This parameter should be updated by this method if it returns true.
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.
On entry the data parameter contains the index key to be cleared. It
should be changed by this method such that
createSecondaryKey(com.sleepycat.je.SecondaryDatabase, com.sleepycat.je.DatabaseEntry, com.sleepycat.je.DatabaseEntry, com.sleepycat.je.DatabaseEntry)
will return false. Other fields in the data object should remain
data- is the source and destination data object.
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