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/********************************************************************************
* Copyright (c) 2002, 2006 IBM Corporation. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Initial Contributors:
* The following IBM employees contributed to the Remote System Explorer
* component that contains this file: David McKnight, Kushal Munir,
* Michael Berger, David Dykstal, Phil Coulthard, Don Yantzi, Eric Simpson,
* Emily Bruner, Mazen Faraj, Adrian Storisteanu, Li Ding, and Kent Hawley.
*
* Contributors:
* {Name} (company) - description of contribution.
********************************************************************************/
package org.eclipse.dstore.core.model;
import java.util.ArrayList;
import org.eclipse.dstore.core.util.ExternalLoader;
/**
* SchemaRegistry implements the interface for external tools to contribute their
* schemas to the DataStore.
*/
public class SchemaRegistry implements ISchemaRegistry
{
private ArrayList _initializedDataStores = new ArrayList();
private ArrayList _extenders = new ArrayList();
/**
* Registers a schema extender with the associated DataStores
* @param extender the schema extender to register
*/
public void registerSchemaExtender(ISchemaExtender extender)
{
if (!_extenders.contains(extender))
{
_extenders.add(extender);
for (int i = 0; i < _initializedDataStores.size(); i++)
{
DataStore dataStore = (DataStore) _initializedDataStores.get(i);
DataElement schemaRoot = dataStore.getDescriptorRoot();
extender.extendSchema(schemaRoot);
}
}
}
/**
* Calls extendSchema() on each of the registered schema extenders to
* extend the schema of the specified DataStore
*
* @param dataStore the DataStore whos schema will be updated
*/
public void extendSchema(DataStore dataStore)
{
if (!_initializedDataStores.contains(dataStore))
{
DataElement schemaRoot = dataStore.getDescriptorRoot();
for (int i = 0; i < _extenders.size(); i++)
{
ISchemaExtender extender = (ISchemaExtender) _extenders.get(i);
extender.extendSchema(schemaRoot);
}
_initializedDataStores.add(dataStore);
}
}
/**
* Gets the <code>ExternalLoader</code> for the specified qualified classname
*
* @param source the qualified classname
* @return the external loader for the specified classname
*/
public ExternalLoader getLoaderFor(String source)
{
for (int i = 0; i < _extenders.size(); i++)
{
ISchemaExtender extender = (ISchemaExtender) _extenders.get(i);
ExternalLoader loader = extender.getExternalLoader();
if (loader.canLoad(source))
{
return loader;
}
}
return null;
}
}
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