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Posted to cvs@avalon.apache.org by mc...@apache.org on 2003/07/25 00:13:52 UTC
cvs commit: avalon-sandbox/merlin/composition-spi/src/java/org/apache/avalon/composition/model StageModel.java
mcconnell 2003/07/24 15:13:52
Added: merlin/composition-spi/src/java/org/apache/avalon/composition/model
StageModel.java
Log:
Definition of a stage model that provides suppport for the explicit declaration of a stage provider (via component address) or via extension selection constrain filtering.
Revision Changes Path
1.1 avalon-sandbox/merlin/composition-spi/src/java/org/apache/avalon/composition/model/StageModel.java
Index: StageModel.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.
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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
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Apache Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.avalon.composition.model;
import org.apache.avalon.meta.info.StageDescriptor;
import org.apache.avalon.meta.info.ExtensionDescriptor;
/**
* Stage model handles the establishment of an explicit source
* extension defintion or stage provider selection based on
* extension qualification.
*
* @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
* @version $Revision: 1.1 $ $Date: 2003/07/24 22:13:52 $
*/
public interface StageModel
{
/**
* Return the stage descriptor for the model.
*
* @return the descriptor declaring the component
* stage dependency
*/
StageDescriptor getStage();
/**
* Return an explicit path to a component.
* If a stage directive has been declared
* and the directive contains a source declaration, the value
* returned is the result of parsing the source value relative
* to the absolute address of the dependent component.
*
* @return the explicit path
*/
String getPath();
/**
* Filter a set of candidate service descriptors and return the
* set of acceptable service as a ordered sequence.
*
* @param candidates the set of candidate extension providers
* for the stage dependency
* @return the accepted candidates in ranked order
*/
ExtensionDescriptor[] filter( ExtensionDescriptor[] candidates );
}
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