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Posted to cvs@avalon.apache.org by mc...@apache.org on 2003/07/14 06:44:03 UTC
cvs commit: avalon-sandbox/merlin/composition/src/java/org/apache/avalon/composition/model/impl DefaultContext.java
mcconnell 2003/07/13 21:44:03
Added: merlin/composition/src/java/org/apache/avalon/composition/model/impl
DefaultContext.java
Log:
Default content implementation class.
Revision Changes Path
1.1 avalon-sandbox/merlin/composition/src/java/org/apache/avalon/composition/model/impl/DefaultContext.java
Index: DefaultContext.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
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Apache Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.avalon.composition.model.impl;
import org.apache.avalon.composition.model.DeploymentContext;
import org.apache.avalon.composition.model.ModelRuntimeException;
import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.avalon.excalibur.i18n.ResourceManager;
import org.apache.avalon.excalibur.i18n.Resources;
import org.apache.avalon.meta.info.EntryDescriptor;
/**
* <p>Default implementation of a context object. The implementation
* maintains a mapping between context keys and context entry models.
* Requests for a context entry value are resolved through redirecting
* the request to an assigned model.</p>
*
* @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
* @version $Revision: 1.1 $ $Date: 2003/07/14 04:44:03 $
*/
public final class DefaultContext implements Context
{
//==============================================================
// static
//==============================================================
private static final Resources REZ =
ResourceManager.getPackageResources( DefaultContext.class );
//==============================================================
// immutable state
//==============================================================
private final DeploymentContext m_context;
//==============================================================
// constructor
//==============================================================
/**
* <p>Creation of a new default context.</p>
*
* @param context the deployment context
*/
public DefaultContext( DeploymentContext context )
{
m_context = context;
}
//==============================================================
// Context
//==============================================================
/**
* Return a context value relative to a key. If the context entry
* is unknown a {@link ContextException} containing the key as
* as the exception message and a null cause will be thrown. If
* the contrext entry is recognized and a error occurs during
* value resolvution a {@link ContextException} will be thrown
* containing the causal exception.
*
* @param key the context entry key
* @return the context entry value
* @exception ContextException if the key is unknown or unresolvable
*/
public Object get( final Object key ) throws ContextException
{
try
{
return m_context.resolve( key.toString() );
}
catch( ModelRuntimeException e )
{
final String error =
REZ.getString( "context.entry.model.error", key );
throw new ContextException( error, e );
}
}
}
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