package com.atlassian.plugin.osgi.factory;
   
   import com.atlassian.plugin.ModuleDescriptor;
   import com.atlassian.plugin.ModuleDescriptorFactory;
   import com.atlassian.plugin.Plugin;
   import com.atlassian.plugin.PluginParseException;
   import com.atlassian.plugin.parsers.XmlDescriptorParser;
   
   import org.apache.commons.lang.Validate;
  import org.dom4j.Element;
  
  import java.io.InputStream;
  
  /**
   * Descriptor parser that handles special tasks for osgi plugins such as recording the
   * originating module descriptor elements.  Must only be used with {@link OsgiPlugin} instances.
   *
   * @since 2.1.2
   */
  public class OsgiPluginXmlDescriptorParser extends XmlDescriptorParser
  {
      /**
       * @param source          The XML descriptor source
       * @param applicationKeys The application keys to limit modules to, null for only unspecified
       * @throws com.atlassian.plugin.PluginParseException
       *          if there is a problem reading the descriptor from the XML {@link java.io.InputStream}.
       */
      public OsgiPluginXmlDescriptorParser(final InputStream source, final String... applicationKeys) throws PluginParseException
      {
          super(source, applicationKeys);
          Validate.notNull(source, "The descriptor source must not be null");
      }
  
      /**
       * Passes module descriptor elements back to the {@link OsgiPlugin}
       *
       * @param plugin                  The plugin
       * @param element                 The module element
       * @param moduleDescriptorFactory The module descriptor factory
       * @return The module, or null if the module cannot be found
       * @throws PluginParseException
       */
      @Override
      protected ModuleDescriptor<?> createModuleDescriptor(final Plugin plugin, final Element element, final ModuleDescriptorFactory moduleDescriptorFactory) throws PluginParseException
      {
          final ModuleDescriptor<?> descriptor = super.createModuleDescriptor(plugin, element, moduleDescriptorFactory);
          final String key = (descriptor != null ? descriptor.getKey() : element.attributeValue("key"));
          ((OsgiPlugin) plugin).addModuleDescriptorElement(key, element);
          return descriptor;
      }
  }