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Posted to cvs@avalon.apache.org by mc...@apache.org on 2003/07/05 09:58:20 UTC
cvs commit: avalon-sandbox/merlin/composition/src/java/org/apache/avalon/composition/model/impl DefaultServiceRepository.java
mcconnell 2003/07/05 00:58:20
Added: merlin/composition/src/java/org/apache/avalon/composition/model/impl
DefaultServiceRepository.java
Log:
Service repository implementation.
Revision Changes Path
1.1 avalon-sandbox/merlin/composition/src/java/org/apache/avalon/composition/model/impl/DefaultServiceRepository.java
Index: DefaultServiceRepository.java
===================================================================
/*
============================================================================
The Apache Software License, Version 1.1
============================================================================
Copyright (C) 1999-2002 The Apache Software Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without modifica-
tion, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. 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.
3. The end-user documentation included with the redistribution, if any, must
include the following acknowledgment: "This product includes software
developed by the Apache Software Foundation (http://www.apache.org/)."
Alternately, this acknowledgment may appear in the software itself, if
and wherever such third-party acknowledgments normally appear.
4. The names "Jakarta", "Apache Avalon", "Avalon Framework" and
"Apache Software Foundation" must not be used to endorse or promote
products derived from this software without prior written
permission. For written permission, please contact apache@apache.org.
5. Products derived from this software may not be called "Apache", nor may
"Apache" appear in their name, without prior written permission of the
Apache Software Foundation.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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
APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
DING, 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.
This software consists of voluntary contributions made by many individuals
on behalf of the Apache Software Foundation. For more information on the
Apache Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.avalon.composition.model.impl;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.avalon.composition.model.ServiceDuplicateException;
import org.apache.avalon.composition.model.ServiceException;
import org.apache.avalon.composition.model.ServiceUnknownException;
import org.apache.avalon.composition.model.ServiceRepository;
import org.apache.avalon.framework.Version;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.meta.info.ReferenceDescriptor;
import org.apache.avalon.meta.info.Service;
import org.apache.avalon.meta.info.builder.ServiceBuilder;
/**
* A service repository provides support for the retrival
* of service defintions.
*
* @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
* @version $Revision: 1.1 $ $Date: 2003/07/05 07:58:20 $
*/
public class DefaultServiceRepository extends AbstractLogEnabled implements ServiceRepository
{
//==============================================================
// state
//==============================================================
/**
* The classloader supplied to the manager.
*/
private ClassLoader m_classloader;
/**
* The parent service manager (may be null)
*/
private ServiceRepository m_parent;
/**
* List of service entries.
*/
private List m_services;
//==============================================================
// constructor
//==============================================================
/**
* Creation of a new root service manager.
* @param services the list of available services
* @exception NullPointerException if the classloader is null
*/
public DefaultServiceRepository( ClassLoader classloader, List services ) throws NullPointerException
{
this( classloader, null, services );
}
/**
* Creation of a new service manager.
* @param parent the parent type manager
* @param services the list of available services
* @exception NullPointerException if the classloader is null
*/
public DefaultServiceRepository(
ClassLoader classloader, ServiceRepository parent, List services )
throws NullPointerException
{
if( services == null )
{
throw new NullPointerException( "services" );
}
m_parent = parent;
m_services = services;
m_classloader = classloader; // not used
}
//==============================================================
// implemetation
//==============================================================
/**
* Locate a {@link Service} instances associated with the
* supplied classname and version. If a service defintion is not
* found locally, the implementation redirects the request to
* the parent service manager.
*
* @param classname the service class name
* @param version the service version
* @return the service matching the supplied classname and version.
* @exception UnknownServiceException if a matching service cannot be found
*/
public Service getService( String classname, Version version )
throws ServiceUnknownException
{
return getService( new ReferenceDescriptor( classname, version ) );
}
/**
* Locate a {@link Service} instances associated with the
* supplied referecne descriptor. If a service defintion is not
* found locally, the implementation redirects the request to
* the parent service manager.
*
* @param classname the service class name
* @param reference the reference descriptor
* @return the service matching the supplied descriptor.
* @exception UnknownServiceException if a matching service cannot be found
*/
public Service getService( ReferenceDescriptor reference ) throws ServiceUnknownException
{
Service service = getLocalService( reference );
if( service == null )
{
if( m_parent != null )
{
return m_parent.getService( reference );
}
else
{
final String error = "Unknown service defintion: " + reference;
throw new ServiceUnknownException( error );
}
}
return service;
}
private Service getLocalService( ReferenceDescriptor reference )
{
Iterator iterator = m_services.iterator();
while( iterator.hasNext() )
{
Service service = (Service) iterator.next();
if( service.equals( reference ) )
{
return service;
}
}
return null;
}
}
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