/*
    * 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.maven.doxia.parser.module;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.Collection;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  /**
   * Simple implementation of the ParserModuleManager interface.
   *
   * @since 1.6
   */
  @Singleton
  @Named
  public class DefaultParserModuleManager implements ParserModuleManager {
      @SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
      @Inject
      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;
      }
  }