package org.apache.maven.archiva.repository.project.resolvers;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import org.apache.commons.collections.CollectionUtils;
import org.apache.maven.archiva.model.ArchivaProjectModel;
import org.apache.maven.archiva.model.VersionedReference;
import org.apache.maven.archiva.repository.project.ProjectModelException;
import org.apache.maven.archiva.repository.project.ProjectModelResolver;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* Represents a stack of {@link ProjectModelResolver} resolvers for
* finding/resolving an ArchivaProjectModel from multiple sources.
*
* @author <a href="mailto:joakime@apache.org">Joakim Erdfelt</a>
* @version $Id: ProjectModelResolverStack.java 562485 2007-08-03 14:44:15Z joakime $
*
* @plexus.component role="org.apache.maven.archiva.repository.project.resolvers.ProjectModelResolverStack"
*/
public class ProjectModelResolverStack
{
private List resolvers;
private List listeners;
public ProjectModelResolverStack()
{
this.resolvers = new ArrayList();
this.listeners = new ArrayList();
}
public void addListener( ProjectModelResolutionListener listener )
{
if ( listener == null )
{
return;
}
this.listeners.add( listener );
}
public void addProjectModelResolver( ProjectModelResolver resolver )
{
if ( resolver == null )
{
return;
}
this.resolvers.add( resolver );
}
public void clearResolvers()
{
this.resolvers.clear();
}
public ArchivaProjectModel findProject( VersionedReference projectRef )
{
if ( CollectionUtils.isEmpty( this.resolvers ) )
{
throw new IllegalStateException( "No resolvers have been defined." );
}
triggerResolutionStart( projectRef, this.resolvers );
Iterator it = this.resolvers.iterator();
while ( it.hasNext() )
{
ProjectModelResolver resolver = (ProjectModelResolver) it.next();
try
{
triggerResolutionAttempting( projectRef, resolver );
ArchivaProjectModel model = resolver.resolveProjectModel( projectRef );
if ( model != null )
{
// Project was found.
triggerResolutionSuccess( projectRef, resolver, model );
return model;
}
triggerResolutionMiss( projectRef, resolver );
}
catch ( ProjectModelException e )
{
triggerResolutionError( projectRef, resolver, e );
}
}
// Project was not found in entire resolver list.
triggerResolutionNotFound( projectRef, this.resolvers );
return null;
}
public boolean hasResolver( ProjectModelResolver resolver )
{
return this.resolvers.contains( resolver );
}
public boolean isEmpty()
{
return this.resolvers.isEmpty();
}
public void prependProjectModelResolver( ProjectModelResolver resolver )
{
if ( resolver == null )
{
return;
}
this.resolvers.add( 0, resolver );
}
public void removeListener( ProjectModelResolutionListener listener )
{
if ( listener == null )
{
return;
}
this.listeners.add( listener );
}
public void removeResolver( ProjectModelResolver resolver )
{
this.resolvers.remove( resolver );
}
private void triggerResolutionAttempting( VersionedReference projectRef, ProjectModelResolver resolver )
{
Iterator it = this.listeners.iterator();
while ( it.hasNext() )
{
ProjectModelResolutionListener listener = (ProjectModelResolutionListener) it.next();
try
{
listener.resolutionAttempting( projectRef, resolver );
}
catch ( Exception e )
{
// do nothing with exception.
}
}
}
private void triggerResolutionError( VersionedReference projectRef, ProjectModelResolver resolver, Exception cause )
{
Iterator it = this.listeners.iterator();
while ( it.hasNext() )
{
ProjectModelResolutionListener listener = (ProjectModelResolutionListener) it.next();
try
{
listener.resolutionError( projectRef, resolver, cause );
}
catch ( Exception e )
{
// do nothing with exception.
}
}
}
private void triggerResolutionMiss( VersionedReference projectRef, ProjectModelResolver resolver )
{
Iterator it = this.listeners.iterator();
while ( it.hasNext() )
{
ProjectModelResolutionListener listener = (ProjectModelResolutionListener) it.next();
try
{
listener.resolutionMiss( projectRef, resolver );
}
catch ( Exception e )
{
// do nothing with exception.
}
}
}
private void triggerResolutionNotFound( VersionedReference projectRef, List resolvers )
{
Iterator it = this.listeners.iterator();
while ( it.hasNext() )
{
ProjectModelResolutionListener listener = (ProjectModelResolutionListener) it.next();
try
{
listener.resolutionNotFound( projectRef, resolvers );
}
catch ( Exception e )
{
// do nothing with exception.
}
}
}
private void triggerResolutionStart( VersionedReference projectRef, List resolvers )
{
Iterator it = this.listeners.iterator();
while ( it.hasNext() )
{
ProjectModelResolutionListener listener = (ProjectModelResolutionListener) it.next();
try
{
listener.resolutionStart( projectRef, resolvers );
}
catch ( Exception e )
{
// do nothing with exception.
}
}
}
private void triggerResolutionSuccess( VersionedReference projectRef, ProjectModelResolver resolver,
ArchivaProjectModel model )
{
Iterator it = this.listeners.iterator();
while ( it.hasNext() )
{
ProjectModelResolutionListener listener = (ProjectModelResolutionListener) it.next();
try
{
listener.resolutionSuccess( projectRef, resolver, model );
}
catch ( Exception e )
{
// do nothing with exception.
}
}
}
}