oracle.toplink.essentials.internal.identitymaps.NoIdentityMap Maven / Gradle / Ivy
/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
* own identifying information: Portions Copyright [yyyy]
* [name of copyright owner]
*/
// Copyright (c) 1998, 2007, Oracle. All rights reserved.
package oracle.toplink.essentials.internal.identitymaps;
import java.util.*;
/**
* Purpose: Provide the capability to not cache objects at all.
*
Responsibilities:
* - Do nothing when an object is cached
*
* @since TOPLink/Java 1.0
*/
public class NoIdentityMap extends IdentityMap {
public NoIdentityMap(int size) {
super(size);
}
/**
* locking for no identity.
*/
public CacheKey acquire(Vector primaryKey) {
CacheKey cacheKey = new CacheKey(primaryKey);
cacheKey.acquire();
return cacheKey;
}
/**
* INTERNAL:
* Used to print all the Locks in every identity map in this session.
* The output of this method will go to log passed in as a parameter.
*/
public void collectLocks(HashMap threadList) {
}
/**
* Allow for the cache to be iterated on.
*/
public Enumeration elements() {
return new Vector(1).elements();
}
/**
* Return the object cached in the identity map
* Return null as no object is cached in the no IM.
*/
public Object get(Vector primaryKey) {
return null;
}
/**
* Return null since no objects are actually cached.
*/
protected CacheKey getCacheKey(CacheKey searchKey) {
return null;
}
/**
* @return 0 (zero)
*/
public int getSize() {
return 0;
}
/**
* Return the number of actual objects of type myClass in the IdentityMap.
* Recurse = true will include subclasses of myClass in the count.
*/
public int getSize(Class myClass, boolean recurse) {
return 0;
}
/**
* Get the write lock value from the cache key associated to the primarykey
*/
public Object getWriteLockValue(Vector primaryKey) {
return null;
}
/**
* Allow for the cache keys to be iterated on.
*/
public Enumeration keys() {
return new Vector(1).elements();
}
/**
* DO NOTHING.
*/
public CacheKey put(Vector aVector, Object object, Object writeLockValue, long readTime) {
return null;
}
/**
* DO NOTHING
*/
public void put(CacheKey key) {
return;
}
/**
* Do Nothing.
* Return null, since no objects are cached.
*/
public Object remove(Vector primaryKey) {
return null;
}
/**
* Do Nothing
* Return null, since no objects are cached.
*/
public Object remove(CacheKey searchKey) {
return null;
}
public void setWriteLockValue(Vector primaryKey, Object writeLockValue) {
}
}