/*
* SelfNamedPlugin.java
*
* Version: $Revision: 3762 $
*
* Date: $Date: 2009-05-07 04:36:47 +0000 (Thu, 07 May 2009) $
*
* Copyright (c) 2002-2009, The DSpace Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the DSpace Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
package org.dspace.core;
/**
* Simple lightweight "framework" for managing plugins.
* <p>
* This is a superclass of all classes which are managed as self-named
* plugins. They must extend <code>SelfNamedPlugin</code> or its
* subclass.
* <p>
* Unfortunately, this has to be an <code>abstract class</code> because
* an <code>interface</code> may not have static methods. The
* <code>pluginAliases</code> method is static so it can be invoked
* without creating an instance, and thus let the aliases live in the
* class itself so there is no need for name mapping in a separate
* configuration file.
* <p>
* See the documentation in the
* <code>PluginManager</code> class for more details.
*
* @author Larry Stone
* @version $Revision: 3762 $
* @see PluginManager
*/
public abstract class SelfNamedPlugin
{
// the specific alias used to find the class that created this instance.
private String myName = null;
/**
* Get the names of this plugin implementation.
* Returns all names to which this plugin answers.
* <p>
* A name should be a short generic name illustrative of the
* service, e.g. <code>"PDF"</code>, <code>"JPEG"</code>, <code>"GIF"</code>
* for media filters.
* <p>
* Each name must be unique among all the plugins implementing any
* given interface, but it can be the same as a name of
* a plugin for a different interface. For example, two classes
* may each have a <code>"default"</code> name if they do not
* implement any of the same interfaces.
*
* @return array of names of this plugin
*/
public static String[] getPluginNames()
{
return null;
}
/**
* Get an instance's particular name.
* Returns the name by which the class was chosen when
* this instance was created. Only works for instances created
* by <code>PluginManager</code>, or if someone remembers to call <code>setPluginName.</code>
* <p>
* Useful when the implementation class wants to be configured differently
* when it is invoked under different names.
*
* @return name or null if not available.
*/
public String getPluginInstanceName()
{
return myName;
}
/**
* Set the name under which this plugin was instantiated.
* Not to be invoked by application code, it is
* called automatically by <code>PluginManager.getNamedPlugin()</code>
* when the plugin is instantiated.
*
* @param name -- name used to select this class.
*/
protected void setPluginInstanceName(String name)
{
myName = name;
}
}