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Posted to cvs@avalon.apache.org by mc...@apache.org on 2003/07/27 05:17:08 UTC
cvs commit: avalon-sandbox/merlin/composition/src/java/org/apache/avalon/composition/model/impl DefaultProfileSelector.java
mcconnell 2003/07/26 20:17:08
Added: merlin/composition/src/java/org/apache/avalon/composition/model/impl
DefaultProfileSelector.java
Log:
Addition of the profile selector implementation.
Revision Changes Path
1.1 avalon-sandbox/merlin/composition/src/java/org/apache/avalon/composition/model/impl/DefaultProfileSelector.java
Index: DefaultProfileSelector.java
===================================================================
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software 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:
*
* 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", "Avalon", 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",
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*
* 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 (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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
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* <http://www.apache.org/>.
*/
package org.apache.avalon.composition.model.impl;
import java.util.ArrayList;
import org.apache.avalon.composition.model.ProfileSelector;
import org.apache.avalon.meta.info.DependencyDescriptor;
import org.apache.avalon.meta.info.StageDescriptor;
import org.apache.avalon.composition.data.Mode;
import org.apache.avalon.composition.data.Profile;
/**
* Default profile selector class. The default selector selects profiles based
* of ranking of profile relative to EXPLICIT, PACKAGED and IMPLICIT
* status. For each category, if a supplied profile matches the category
* the first profile matching the category is returned.
*
* @author <a href="mailto:mcconnell@apache.org">Stephen McConnell</a>
* @version $Revision: 1.1 $ $Date: 2003/07/27 03:17:08 $
*/
class DefaultProfileSelector implements ProfileSelector
{
//==============================================================
// ProfileSelector
//==============================================================
/**
* Returns the preferred profile from an available selection of
* candidates profiles.
*
* @param profiles the set of candidate profiles
* @param dependency a service dependency
* @return the preferred profile or null if no satisfactory profile
* can be established
*/
public Profile select( Profile[] profiles, DependencyDescriptor dependency )
{
return select( profiles );
}
/**
* Returns the preferred profile from an available selection of
* candidates profiles.
*
* @param profiles the set of candidate profiles
* @param dependency a stage dependency
* @return the preferred extension provider profile or null if
* no satisfactory profile can be established
*/
public Profile select( Profile[] profiles, StageDescriptor stage )
{
return select( profiles );
}
//==============================================================
// implementation
//==============================================================
/**
* Select a profile from a set of profiles based on a priority ordering
* of EXPLICIT, PACKAGE and lastly IMPLICIT. If multiple candidates
* exist for a particular mode, return the first candidate.
*
* @param profiles the set of candidate profiles
* @param dependency the service dependency
* @return the preferred profile or null if no satisfactory
* provider can be established
*/
private Profile select( Profile[] profiles )
{
if( profiles.length == 0 )
{
return null;
}
for( int i=0; i<profiles.length; i++ )
{
if( profiles[i].getMode().equals( Mode.EXPLICIT ) )
{
return profiles[i];
}
}
for( int i=0; i<profiles.length; i++ )
{
if( profiles[i].getMode().equals( Mode.PACKAGED ) )
{
return profiles[i];
}
}
for( int i=0; i<profiles.length; i++ )
{
if( profiles[i].getMode().equals( Mode.IMPLICIT ) )
{
return profiles[i];
}
}
return null;
}
}
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