/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* !#
*/
package net.ontopia.persistence.proxy;
/**
* INTERNAL: A transactional read-only storage cache
* implementation.
*/
public class ROLocalCache extends AbstractLocalCache {
ROLocalCache(ROTransaction txn, StorageCacheIF pcache) {
super(txn, pcache);
}
// -----------------------------------------------------------------------------
// StorageCacheIF implementation
// -----------------------------------------------------------------------------
public boolean exists(StorageAccessIF access, IdentityIF identity) {
// check parent cache
if (pcache != null)
return pcache.exists(access, identity);
// check database
return access.loadObject(this, identity);
}
public Object getValue(StorageAccessIF access, IdentityIF identity, int field) {
// check parent cache
if (pcache != null)
return pcache.getValue(access, identity, field);
// otherwise get directly from database
return access.loadField(this, identity, field);
}
// -----------------------------------------------------------------------------
// Misc
// -----------------------------------------------------------------------------
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("proxy.ROLocalCache@");
sb.append(System.identityHashCode(this));
if (pcache != null)
sb.append(" [parent = ").append(pcache).append(']');
return sb.toString();
}
}