package org.apache.maven.plugin.surefire;
   
   /*
    * 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 java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Set;
  import org.apache.maven.plugin.logging.Log;
  import org.apache.maven.plugin.surefire.booterclient.ProviderDetector;
  import org.apache.maven.surefire.providerapi.SurefireProvider;
  import org.apache.maven.surefire.util.NestedRuntimeException;
  
  /**
   * @author Kristian Rosenvold
   */
  public class ProviderList
  {
      private final ProviderInfo[] wellKnownProviders;
  
      private final ConfigurableProviderInfo dynamicProvider;
  
      public ProviderList( ConfigurableProviderInfo dynamicProviderInfo, ProviderInfo... wellKnownProviders )
      {
          this.wellKnownProviders = wellKnownProviders;
          this.dynamicProvider = dynamicProviderInfo;
      }
  
  
      public List<ProviderInfo> resolve( Log log )
      {
          List<ProviderInfo> providersToRun = new ArrayList<ProviderInfo>();
  
          Set<String> manuallyConfiguredProviders = getManuallyConfiguredProviders();
          if ( manuallyConfiguredProviders.size() > 0 )
          {
              for ( String name : manuallyConfiguredProviders )
              {
                  ProviderInfo wellKnown = findByName( name );
                  ProviderInfo providerToAdd = wellKnown != null ? wellKnown : dynamicProvider.instantiate( name );
                  log.info( "Using configured provider " + providerToAdd.getProviderName() );
                  providersToRun.add( providerToAdd );
              }
              return providersToRun;
          }
  
          return autoDetectOneProvider();
      }
  
      private List<ProviderInfo> autoDetectOneProvider()
      {
          List<ProviderInfo> providersToRun = new ArrayList<ProviderInfo>();
          for ( ProviderInfo wellKnownProvider : wellKnownProviders )
          {
              if ( wellKnownProvider.isApplicable() )
              {
                  providersToRun.add( wellKnownProvider );
                  return providersToRun;
              }
          }
          return providersToRun;
      }
  
      private Set<String> getManuallyConfiguredProviders()
      {
          try
          {
              return ProviderDetector.getServiceNames( SurefireProvider.class,
                                                       Thread.currentThread().getContextClassLoader() );
          }
  
          catch ( IOException e )
          {
              throw new NestedRuntimeException( e );
          }
      }
  
      private ProviderInfo findByName( String providerClassName )
      {
          for ( ProviderInfo wellKnownProvider : wellKnownProviders )
          {
              if ( wellKnownProvider.getProviderName().equals( providerClassName ) )
             {
                 return wellKnownProvider;
             }
         }
         return null;
     }
 }