2007-04-26 08:27:23 +00:00

101 lines
4.1 KiB
Java

/*
* Copyright (C) 2005-2007 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.admin.registry;
import java.io.Serializable;
import java.util.Collection;
/**
* Interface for service providing access to key-value pairs for storage
* of system-controlled metadata.
*
* @author Derek Hulley
*/
public interface RegistryService
{
/**
* Assign a value to the registry key, which must be of the form <b>/a/b/c</b>.
*
* @param key the registry key.
* @param value any value that can be stored in the repository.
*/
void addProperty(RegistryKey key, Serializable value);
/**
* @param key the registry key.
* @return Returns the value stored in the key or <tt>null</tt> if
* no value exists at the path and name provided
*
* @see #addProperty(String, Serializable)
*/
Serializable getProperty(RegistryKey key);
/**
* Fetches all child elements for the given path. The key's property should be
* <tt>null</tt> as it is completely ignored.
* <code><pre>
* ...
* registryService.addValue(KEY_A_B_C_1, VALUE_ONE);
* registryService.addValue(KEY_A_B_C_2, VALUE_TWO);
* ...
* assertTrue(registryService.getChildElements(KEY_A_B_null).contains("C"));
* ...
* </pre></code>
*
* @param key the registry key with the path. The last element in the path
* will be ignored, and can be any acceptable value localname or <tt>null</tt>.
* @return Returns all child elements (not values) for the given key, ignoring
* the last element in the key.
*
* @see RegistryKey#getPath()
*/
Collection<String> getChildElements(RegistryKey key);
/**
* Copies the path or value from the source to the target location. The source and target
* keys <b>must</b> be both either path-specific or property-specific. If the source doesn't
* exist, then nothing will be done; there is no guarantee that the target will exist after
* the call.
* <p>
* This is essentially a merge operation. Use {@link #delete(RegistryKey) delete} first
* if the target must be cleaned.
*
* @param sourceKey the source registry key to take values from
* @param targetKey the target registyr key to move the path or value to
*/
void copy(RegistryKey sourceKey, RegistryKey targetKey);
/**
* Delete the path element or value described by the key. If the key points to nothing,
* then nothing is done.
* <code>delete(/a/b/c)</code> will remove value <b>c</b> from path <b>/a/b</b>.<br/>
* <code>delete(/a/b/null)</code> will remove node <b>/a/b</b> along with all values and child
* elements.
*
* @param key the path or value to delete
*/
void delete(RegistryKey key);
}