Package org.chenile.stm.impl

Class CreateOrUseExistingObjectRule<T>

java.lang.Object

org.apache.commons.digester.Rule

org.apache.commons.digester.ObjectCreateRule

org.chenile.stm.impl.CreateOrUseExistingObjectRule<T>

Type Parameters:

T -

public class CreateOrUseExistingObjectRule<T>
extends org.apache.commons.digester.ObjectCreateRule

Useful as an enhancement over the ObjectCreateRule for digester. This one creates a new object or uses an existing one if an old one was already created using the same ID. The ID has to be an attribute for the given xml tag. Its name is "id" by default but can be changed to something else if required. The finderMethod is the method to call on the previous object in the digester stack ( the object that is assumed to "collect" all the IDs so far) to obtain the old object if an old object was already created for that Id. The finderMethod must accept the "id" and nothing else and return the already created object. Only string ids are supported.

Author:

Raja Shankar Kolluru

Field Summary

Fields

Modifier and Type	Field	Description
private Class<T>	classToCreate
private String	finderMethod
private static final String	ID
private String	idAttributeName

Fields inherited from class org.apache.commons.digester.ObjectCreateRule

attributeName, className

Fields inherited from class org.apache.commons.digester.Rule

digester, namespaceURI

Constructor Summary

Constructors

Constructor	Description
CreateOrUseExistingObjectRule(Class<T> whichClazz, String finderMethod)
CreateOrUseExistingObjectRule(Class<T> whichClazz, String finderMethod, String idAttributeName)

Method Summary

Modifier and Type	Method	Description
void	begin(Attributes attributes)

Methods inherited from class org.apache.commons.digester.ObjectCreateRule

end, toString

Methods inherited from class org.apache.commons.digester.Rule

begin, body, body, end, finish, getDigester, getNamespaceURI, setDigester, setNamespaceURI

Methods inherited from class java.lang.Object

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

Field Details

ID

private static final String ID

See Also:

• Constant Field Values

finderMethod

private String finderMethod

classToCreate

private Class<T> classToCreate

idAttributeName

private String idAttributeName

Constructor Details

CreateOrUseExistingObjectRule

public CreateOrUseExistingObjectRule(Class<T> whichClazz,
 String finderMethod,
 String idAttributeName)

CreateOrUseExistingObjectRule

public CreateOrUseExistingObjectRule(Class<T> whichClazz,
 String finderMethod)

Method Details

begin

public void begin(Attributes attributes)
           throws Exception

Overrides:

begin in class org.apache.commons.digester.ObjectCreateRule

Throws:

Exception