org.exolab.castor.persist.spi

Interface PersistenceFactory

public interface PersistenceFactory

Factory for producing new persistence implementations. Used for constructing a persistence service provider (see Persistence) as well as for constructing new query expressions (see QueryExpression).

The factory is specified in the JDO configuration file for the database and is configured through Bean-like accessor methods.

Version: $Revision: 5951 $ $Date: 2004-03-25 05:34:48 -0700 (Thu, 25 Mar 2004) $

Author: Assaf Arkin Bruce Snyder

See Also: Persistence

Method Summary
StringgetFactoryName()
Returns the name of this factory.
PersistencegetPersistence(ClassDescriptor clsDesc)
Returns a persistence implementation for the specified object type (given its descriptor) on behalf of the specified cache engine.
QueryExpressiongetQueryExpression()
Returns a new empty query expression suitable for the underlying SQL engine.
BooleanisDuplicateKeyException(Exception except)
Determines it the given exception is indication of a duplicate key.
StringquoteName(String name)
Returns the quoted identifier suitable for preventing conflicts between database identifiers and reserved keywords.

Method Detail

getFactoryName

public String getFactoryName()
Returns the name of this factory. A descriptive name that indicates the type of supported database server or SQL syntax.

Returns: The name of this factory

getPersistence

public Persistence getPersistence(ClassDescriptor clsDesc)
Returns a persistence implementation for the specified object type (given its descriptor) on behalf of the specified cache engine. Return null if no persistence support is available for the specified object type.

Parameters: clsDesc The class descriptor (may be null)

Returns: A suiteable persistence implementation, or null

Throws: MappingException Indicates that the object type is not supported by the persistence engine due to improper mapping

getQueryExpression

public QueryExpression getQueryExpression()
Returns a new empty query expression suitable for the underlying SQL engine. The implementation will construct SQL query statements in the preferred syntax.

Returns: New empty query expression

isDuplicateKeyException

public Boolean isDuplicateKeyException(Exception except)
Determines it the given exception is indication of a duplicate key.

Returns: TRUE means "yes", FALSE means "no", null means "cannot determine"

quoteName

public String quoteName(String name)
Returns the quoted identifier suitable for preventing conflicts between database identifiers and reserved keywords.

Parameters: name The identifier (table, column, etc)

Returns: The quoted identifier

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