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 com.damon.cqrs.spi;
  
  import java.util.Optional;
  
  /**
   * SpiExtensionFactory.
   */
  @Join
  public class SpiExtensionFactory implements ExtensionFactory {
  
      @Override
      public <T> T getExtension(final String key, final Class<T> clazz) {
          return Optional.ofNullable(clazz)
                  .filter(Class::isInterface)
                  .filter(cls -> cls.isAnnotationPresent(SPI.class))
                  .map(ExtensionLoader::getExtensionLoader)
                  .map(ExtensionLoader::getDefaultJoin)
                  .orElse(null);
      }
  }
  