PropertyValueDAO and alf_prop_class implementation

- Contains patch that is incomplete i.e. future DAO unit tests won't work for incremental dev upgrades

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@15405 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/domain/propval/AbstractPropertyValueDAOImpl.java

@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2005-2009 Alfresco Software Limited.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+ * As a special exception to the terms and conditions of version 2.0 of 
+ * the GPL, you may redistribute this Program in connection with Free/Libre 
+ * and Open Source Software ("FLOSS") applications as described in Alfresco's 
+ * FLOSS exception.  You should have recieved a copy of the text describing 
+ * the FLOSS exception, and it is also available here: 
+ * http://www.alfresco.com/legal/licensing"
+ */
+package org.alfresco.repo.domain.propval;
+
+import java.io.Serializable;
+
+import org.alfresco.error.AlfrescoRuntimeException;
+import org.alfresco.repo.cache.SimpleCache;
+import org.alfresco.repo.cache.lookup.EntityLookupCache;
+import org.alfresco.repo.cache.lookup.EntityLookupCache.EntityLookupCallbackDAO;
+import org.alfresco.util.Pair;
+
+/**
+ * Abstract implementation for Property Value DAO.
+ * <p>
+ * This provides basic services such as caching, but defers to the underlying implementation
+ * for CRUD operations. 
+ * 
+ * @author Derek Hulley
+ * @since 3.3
+ */
+public abstract class AbstractPropertyValueDAOImpl implements PropertyValueDAO
+{
+    private static final String CACHE_REGION_PROPERTY_CLASS = "PropertyClass";
+    private EntityLookupCache<Long, Class<?>, String> propertyClassCache;
+    
+    /**
+     * 
+     * @param propertyClassCache            the cache of IDs to property classes
+     */
+    public void setPropertyClassCache(SimpleCache<Serializable, Object> propertyClassCache)
+    {
+        PropertyValueCallbackDAO daoCallback = new PropertyValueCallbackDAO();
+        this.propertyClassCache = new EntityLookupCache<Long, Class<?>, String>(
+                propertyClassCache,
+                CACHE_REGION_PROPERTY_CLASS,
+                daoCallback);
+    }
+
+    public Pair<Long, Class<?>> getPropertyClass(Long id)
+    {
+        Pair<Long, Class<?>> entityPair = propertyClassCache.getByKey(id);
+        if (entityPair == null)
+        {
+            throw new AlfrescoRuntimeException("No property class exists for ID " + id);
+        }
+        return entityPair;
+    }
+
+    public Pair<Long, Class<?>> getPropertyClass(Class<?> clazz)
+    {
+        Pair<Long, Class<?>> entityPair = propertyClassCache.getByValue(clazz);
+        return entityPair;
+    }
+
+    public Pair<Long, Class<?>> getOrCreatePropertyClass(Class<?> clazz)
+    {
+        Pair<Long, Class<?>> entityPair = propertyClassCache.getOrCreateByValue(clazz);
+        return entityPair;
+    }
+
+    /**
+     * Callback for <b>alf_prop_type</b> DAO.
+     */
+    private class PropertyValueCallbackDAO implements EntityLookupCallbackDAO<Long, Class<?>, String>
+    {
+        private final Pair<Long, Class<?>> convertEntityToPair(PropertyClassEntity propertyClassEntity)
+        {
+            if (propertyClassEntity == null)
+            {
+                return null;
+            }
+            else
+            {
+                return propertyClassEntity.getEntityPair();
+            }
+        }
+        
+        public String getValueKey(Class<?> value)
+        {
+            return value.getName();
+        }
+
+        public Pair<Long, Class<?>> createValue(Class<?> value)
+        {
+            PropertyClassEntity propertyClassEntity = createClass(value);
+            return convertEntityToPair(propertyClassEntity);
+        }
+
+        public Pair<Long, Class<?>> findByKey(Long key)
+        {
+            PropertyClassEntity propertyClassEntity = findClassById(key);
+            return convertEntityToPair(propertyClassEntity);
+        }
+
+        public Pair<Long, Class<?>> findByValue(Class<?> value)
+        {
+            PropertyClassEntity propertyClassEntity = findClassByValue(value);
+            return convertEntityToPair(propertyClassEntity);
+        }
+    }
+    
+    protected abstract PropertyClassEntity createClass(Class<?> value);
+    protected abstract PropertyClassEntity findClassById(Long id);
+    protected abstract PropertyClassEntity findClassByValue(Class<?> value);
+}