package org.apache.maven.plugin;

 /*

  * 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.maven.model.Plugin;

 import org.apache.maven.plugin.descriptor.PluginDescriptor;

 import org.codehaus.plexus.component.discovery.ComponentDiscoveryEvent;

 import org.codehaus.plexus.component.discovery.ComponentDiscoveryListener;

 import org.codehaus.plexus.component.repository.ComponentSetDescriptor;

 import org.codehaus.plexus.logging.AbstractLogEnabled;

 import java.util.HashMap;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.Map;

 import java.util.Set;

 public class MavenPluginCollector

     extends AbstractLogEnabled

     implements ComponentDiscoveryListener

 {

     private Set pluginsInProcess = new HashSet();

     private Map pluginDescriptors = new HashMap();

     private Map pluginIdsByPrefix = new HashMap();

     // ----------------------------------------------------------------------

     // Mojo discovery

     // ----------------------------------------------------------------------

     public void componentDiscovered( ComponentDiscoveryEvent event )

     {

         ComponentSetDescriptor componentSetDescriptor = event.getComponentSetDescriptor();

         if ( componentSetDescriptor instanceof PluginDescriptor )

         {

             PluginDescriptor pluginDescriptor = (PluginDescriptor) componentSetDescriptor;

             String key = PluginUtils.constructVersionedKey( pluginDescriptor );

             if ( !pluginsInProcess.contains( key ) )

             {

                 pluginsInProcess.add( key );

                 pluginDescriptors.put( key, pluginDescriptor );

                 // TODO: throw an (not runtime) exception if there is a prefix overlap - means doing so elsewhere

                 // we also need to deal with multiple versions somehow - currently, first wins

                 if ( !pluginIdsByPrefix.containsKey( pluginDescriptor.getGoalPrefix() ) )

                 {

                     pluginIdsByPrefix.put( pluginDescriptor.getGoalPrefix(), pluginDescriptor );

                 }

             }

         }

     }

     public PluginDescriptor getPluginDescriptor( Plugin plugin )

     {

         String key = PluginUtils.constructVersionedKey( plugin );

         return (PluginDescriptor) pluginDescriptors.get( key );

     }

     public boolean isPluginInstalled( Plugin plugin )

     {

         String key = PluginUtils.constructVersionedKey( plugin );

         return pluginDescriptors.containsKey( key );

     }

     public PluginDescriptor getPluginDescriptorForPrefix( String prefix )

     {

         return (PluginDescriptor) pluginIdsByPrefix.get( prefix );

     }

     public void flushPluginDescriptor( Plugin plugin )

     {

         String key = PluginUtils.constructVersionedKey( plugin );

         pluginsInProcess.remove( key );

         pluginDescriptors.remove( key );

         for ( Iterator it = pluginIdsByPrefix.entrySet().iterator(); it.hasNext(); )

         {

             Map.Entry entry = (Map.Entry) it.next();

             if ( key.equals( PluginUtils.constructVersionedKey( (PluginDescriptor) entry.getValue() ) ) )

             {

                 it.remove();

             }

         }

     }

 }