content: /*
   * 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.
   */
  package org.apache.aries.blueprint.parser;
  
  import java.io.IOException;
  import java.net.URI;
  import java.util.Map;
  import java.util.Set;
  import javax.xml.validation.Schema;
  
  import org.apache.aries.blueprint.NamespaceHandler;
  import org.xml.sax.SAXException;
  
  /**
   * Interface used to managed a set of namespace handlers
   */
  public interface NamespaceHandlerSet {
  
      Set<URI> getNamespaces();
  
      boolean isComplete();
  
      /**
       * Retrieve the NamespaceHandler to use for the given namespace
       *
       * @return the NamespaceHandler to use or <code>null</code> if none is available at this time
       */
      NamespaceHandler getNamespaceHandler(URI namespace);
  
      /**
       * Obtain a schema to validate the XML for the given list of namespaces
       *
       * @return the schema to use to validate the XML
       */
      Schema getSchema() throws SAXException, IOException;
  
      /**
       * Obtain a schema to validate the XML for the given list of namespaces
       *
       * @return the schema to use to validate the XML
       */
      Schema getSchema(Map<String, String> locations) throws SAXException, IOException;
  
      /**
       * Add a new Listener to be called when namespace handlers are registerd or unregistered
       *
       * @param listener the listener to register
       */
      void addListener(Listener listener);
  
      /**
       * Remove a previously registered Listener
       *
       * @param listener the listener to unregister
       */
      void removeListener(Listener listener);
  
      /**
       * Destroy this handler set
       */
      void destroy();
      
      /**
       * Interface used to listen to registered or unregistered namespace handlers.
       *
       * @see NamespaceHandlerSet#addListener(org.apache.aries.blueprint.container.NamespaceHandlerRegistry.Listener)
       * @see NamespaceHandlerSet#removeListener(org.apache.aries.blueprint.container.NamespaceHandlerRegistry.Listener) 
       */
      interface Listener {
  
          /**
           * Called when a NamespaceHandler has been registered for the specified URI.
           *
           * @param uri the URI of the newly registered namespace handler
           */
          void namespaceHandlerRegistered(URI uri);
  
          /**
           * Called when a NamespaceHandler has been unregistered for the specified URI.
           *
           * @param uri the URI of the newly unregistered namespace handler
           */
          void namespaceHandlerUnregistered(URI uri);
  
      }
  }