wt.fc
Class ObjectTable

java.lang.Object
  wt.fc.ObjectTable

public class ObjectTable

extends Object

A table of Persistable objects with support for maintaining a set of shared ObjectReference objects which may refer to objects in the table.

Nested Class Summary

private static class

ObjectTable.OidArrayImpl

Field Summary

private static ObjectIdentifier	nullOid
private Hashtable	objTable
private Hashtable	refTable
private static String	RESOURCE

Constructor Summary

ObjectTable()

Method Summary

Persistable	get(ObjectIdentifier oid) Get a persistent object from the table given its ObjectIdentifier.
OidArray	getOidArray() Get an OidArray for the ObjectReferences in this table.
ObjectReference	getRef(ObjectReference obj_ref) Get or store an ObjectReference.
void	put(Persistable obj) Put a persistent object in the table.

Methods inherited from class java.lang.Object

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

Field Detail

RESOURCE

private static final String RESOURCE

See Also:

Constant Field Values

nullOid

private static ObjectIdentifier nullOid

objTable

private Hashtable objTable

refTable

private Hashtable refTable

Constructor Detail

ObjectTable

public ObjectTable()

Method Detail

get

public Persistable get(ObjectIdentifier oid)

Get a persistent object from the table given its ObjectIdentifier.

Parameters:

oid - ObjectIdentifier of the Persistent Object

Returns:

the cached object or null if not found

put

public void put(Persistable obj)

Put a persistent object in the table. The object must be persistent, that is, it must have an assigned ObjectIdentifier. If an ObjectReference exists in the table which refers to this Persistable, its derived object field is set to this object.

Parameters:

obj - the persistent object

getRef

public ObjectReference getRef(ObjectReference obj_ref)

Get or store an ObjectReference. If an ObjectReference already exists for the referenced object, it will be returned. Otherwise, the given ObjectReference will be added to the table and returned.

Parameters:

obj_ref - ObjectReference to a Persistent Object

Returns:

the ObjectReference

getOidArray

public OidArray getOidArray()

Get an OidArray for the ObjectReferences in this table.

Returns:

OidArray for the ObjectReferences in this table