package org.apache.maven.doxia.parser.module;
   
   /*
    * 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.util.Collection;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  
  /**
   * Simple implementation of the ParserModuleManager interface.
   *
   * @since 1.6
   */
  @Component( role = ParserModuleManager.class )
  public class DefaultParserModuleManager
      implements ParserModuleManager
  {
      @SuppressWarnings( "MismatchedQueryAndUpdateOfCollection" )
      @Requirement( role = ParserModule.class )
      private Map<String, ParserModule> parserModules;
  
      private Collection<ParserModule> parserModulesValues;
  
      /**
       * {@inheritDoc}
       *
       * @return a {@link java.util.Collection} object.
       */
      public Collection<ParserModule> getParserModules()
      {
          if ( parserModulesValues == null )
          {
              Map<Class<?>, ParserModule> parserModulesTmp = new LinkedHashMap<>();
              for ( ParserModule module : parserModules.values() )
              {
                  parserModulesTmp.put( module.getClass(), module );
              }
              parserModulesValues = parserModulesTmp.values();
          }
  
          return parserModulesValues;
      }
  
      /** {@inheritDoc} */
      public ParserModule getParserModule( String id )
          throws ParserModuleNotFoundException
      {
          ParserModule parserModule = parserModules.get( id );
  
          if ( parserModule == null )
          {
              throw new ParserModuleNotFoundException( "Cannot find parser module id = " + id );
          }
  
          return parserModule;
      }
  }