package org.codehaus.plexus.configuration.source;
   
   import java.util.List;
   
   import org.codehaus.plexus.component.repository.ComponentDescriptor;
   import org.codehaus.plexus.configuration.PlexusConfiguration;
   
   /**
    * A configuration source that delegates to any number of underlying configuration sources. If you are an application
   * author and want to create a custom source of configuration for the components in your application then you would most
   * likely want to create a chained configuration source where you can decide the order of processing, but still have the
   * container perform its default behavior.
   *
   * @author Jason van Zyl
   */
  public class ChainedConfigurationSource implements ConfigurationSource {
      private List configurationSources;
  
      public ChainedConfigurationSource(List configurationSources) {
          this.configurationSources = configurationSources;
      }
  
      public PlexusConfiguration getConfiguration(ComponentDescriptor componentDescriptor) {
          for (Object configurationSource1 : configurationSources) {
              ConfigurationSource configurationSource = (ConfigurationSource) configurationSource1;
  
              PlexusConfiguration configuration = configurationSource.getConfiguration(componentDescriptor);
  
              if (configuration != null) {
                  return configuration;
              }
          }
  
          return null;
      }
  
      public List getConfigurationSources() {
          return configurationSources;
      }
  }