org.apache.cayenne.access.types

Class ExtendedTypeMap

java.lang.Object

org.apache.cayenne.access.types.ExtendedTypeMap

public class ExtendedTypeMap
extends Object

Stores ExtendedTypes, implementing an algorithm to determine the right type for a given Java class. See getRegisteredType(String) documentation for lookup algorithm details.

Field Summary

Fields

Modifier and Type	Field and Description
protected ExtendedType	defaultType
protected Map<String,ExtendedType>	typeMap

Constructor Summary

Constructors

Constructor and Description
ExtendedTypeMap() Creates new ExtendedTypeMap, populating it with default JDBC-compatible types.

Method Summary

Methods

Modifier and Type	Method and Description
void	addFactory(ExtendedTypeFactory factory) Adds an ExtendedTypeFactory that will be consulted if no direct mapping for a given class exists.
protected ExtendedType	createType(String className) Returns an ExtendedType for specific Java classes.
ExtendedType	getDefaultType() Returns a default ExtendedType that is used to handle unmapped types.
ExtendedType	getRegisteredType(Class<?> javaClass) Returns a type registered for the class name.
ExtendedType	getRegisteredType(String javaClassName) Returns a guaranteed non-null ExtendedType instance for a given Java class name.
String[]	getRegisteredTypeNames() Returns array of Java class names supported by Cayenne for JDBC mapping.
protected void	initDefaultFactories() Registers default factories for creating enum types and serializable types.
void	registerType(ExtendedType type) Adds a new type to the list of registered types.
void	removeFactory(ExtendedTypeFactory factory) Removes a factory from the registered factories if it was previously added.
void	unregisterType(String javaClassName) Removes registered ExtendedType object corresponding to javaClassName parameter.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

typeMap

protected final Map<String,ExtendedType> typeMap

defaultType

protected ExtendedType defaultType

Constructor Detail

ExtendedTypeMap

public ExtendedTypeMap()

Creates new ExtendedTypeMap, populating it with default JDBC-compatible types. If JDK version is at least 1.5, also loads support for enumerated types.

Method Detail

initDefaultFactories

protected void initDefaultFactories()

Registers default factories for creating enum types and serializable types. Note that user-defined factories are consulted before any default factory.

Since:

3.0

addFactory

public void addFactory(ExtendedTypeFactory factory)

Adds an ExtendedTypeFactory that will be consulted if no direct mapping for a given class exists. This feature can be used to map interfaces.

Note that the order in which factories are added is important, as factories are consulted in turn when an ExtendedType is looked up, and lookup is stopped when any factory provides a non-null type.

Since:

1.2

removeFactory

public void removeFactory(ExtendedTypeFactory factory)

Removes a factory from the registered factories if it was previously added.

Since:

1.2

registerType

public void registerType(ExtendedType type)

Adds a new type to the list of registered types. If there is another type registered for a class described by the type argument, the old handler is overridden by the new one.

getDefaultType

public ExtendedType getDefaultType()

Returns a default ExtendedType that is used to handle unmapped types.

getRegisteredType

public ExtendedType getRegisteredType(String javaClassName)

Returns a guaranteed non-null ExtendedType instance for a given Java class name. Primitive class names are internally replaced by the non-primitive counterparts. The following lookup sequence is used to determine the type:

• First the methods checks for an ExtendedType explicitly registered with the map for a given class name (most common types are registered by Cayenne internally; users can register their own).
• Second, the method tries to obtain a type by iterating through ExtendedTypeFactory instances registered by users. If a factory returns a non-null type, it is returned to the user and the rest of the factories are ignored.
• Third, the method iterates through standard ExtendedTypeFactory instances that can dynamically construct extended types for serializable objects and JDK 1.5 enums.
• If all the methods above failed, the default type is returned that relies on default JDBC driver mapping to set and get objects.

Note that for array types class name must be in the form 'MyClass[]'.

getRegisteredType

public ExtendedType getRegisteredType(Class<?> javaClass)

Returns a type registered for the class name. If no such type exists, returns the default type. It is guaranteed that this method returns a non-null ExtendedType instance.

unregisterType

public void unregisterType(String javaClassName)

Removes registered ExtendedType object corresponding to javaClassName parameter.

getRegisteredTypeNames

public String[] getRegisteredTypeNames()

Returns array of Java class names supported by Cayenne for JDBC mapping.

createType

protected ExtendedType createType(String className)

Returns an ExtendedType for specific Java classes. Uses user-provided and Cayenne-provided ExtendedTypeFactory factories to instantiate the ExtendedType. All primitive classes must be converted to the corresponding Java classes by the callers.

Returns:

a default type for a given class or null if a class has no default type mapping.

Since:

1.2