mirror of
https://github.com/Alfresco/alfresco-community-repo.git
synced 2025-10-08 14:51:49 +00:00
84841e063f
125788 rmunteanu: Merged 5.1.N (5.1.2) to 5.2.N (5.2.1)
125606 rmunteanu: Merged 5.1.1 (5.1.1) to 5.1.N (5.1.2)
125515 slanglois: MNT-16155 Update source headers - add new Copyrights for Java and JSP source files + automatic check in the build
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@127810 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
94 lines
2.6 KiB
Java
94 lines
2.6 KiB
Java
/*
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* #%L
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* Alfresco Repository
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* %%
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* Copyright (C) 2005 - 2016 Alfresco Software Limited
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* %%
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* This file is part of the Alfresco software.
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* If the software was purchased under a paid Alfresco license, the terms of
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* the paid license agreement will prevail. Otherwise, the software is
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* provided under the following open source license terms:
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*
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* Alfresco is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Alfresco is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
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* #L%
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*/
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package org.alfresco.repo.cache;
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import java.io.Serializable;
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import java.util.Collection;
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import java.util.Collections;
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/**
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* A cache that does nothing - always.
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* <P/>
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* There are conditions under which code that expects to be caching, should not be. Using this
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* cache, it becomes possible to configure a valid cache in whilst still ensuring that the
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* actual caching is not performed.
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*
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* @author Derek Hulley
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*/
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public class NullCache<K extends Serializable, V extends Object> implements SimpleCache<K, V>
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{
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/** Singleton for retrieval via {@link #getInstance() } */
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private static final NullCache<Serializable, Object> INSTANCE = new NullCache<Serializable, Object>();
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/**
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* @return Returns a singleton that can be used in any way - all operations are stateless
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*/
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@SuppressWarnings("unchecked")
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public static final <K extends Serializable, V extends Object> NullCache<K, V> getInstance()
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{
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return (NullCache<K, V>) INSTANCE;
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}
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public NullCache()
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{
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}
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/** NO-OP */
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public boolean contains(K key)
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{
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return false;
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}
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public Collection<K> getKeys()
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{
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return Collections.<K>emptyList();
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}
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/** NO-OP */
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public V get(K key)
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{
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return null;
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}
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/** NO-OP */
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public void put(K key, V value)
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{
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return;
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}
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/** NO-OP */
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public void remove(K key)
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{
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return;
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}
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/** NO-OP */
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public void clear()
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{
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return;
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}
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}
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