/*
    * 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.commons.monitoring.reporting.web.plugin;
  
  import org.apache.commons.monitoring.configuration.Configuration;
  import org.apache.commons.monitoring.reporting.web.handler.internal.EndpointInfo;
  import org.apache.commons.monitoring.reporting.web.handler.internal.Invoker;
  
  import java.util.Collection;
  import java.util.Map;
  import java.util.ServiceLoader;
  import java.util.concurrent.CopyOnWriteArrayList;
  import java.util.regex.Pattern;
  
  public final class PluginRepository {
      public static Collection<PluginInfo> PLUGIN_INFO = new CopyOnWriteArrayList<PluginInfo>();
  
      static {
          for (final Plugin plugin : ServiceLoader.load(Plugin.class, Plugin.class.getClassLoader())) {
              final String name = plugin.name();
              if (name == null) {
                  throw new IllegalArgumentException("plugin name can't be null");
              }
              if (!Configuration.is(name + "activated", true)) {
                  continue;
              }
  
              final String mapping = plugin.mapping();
              final Class<?> handler = plugin.endpoints();
              if (mapping != null) {
                  PLUGIN_INFO.add(new PluginInfo(mapping, name, EndpointInfo.build(handler, plugin.name(), plugin.mapping())));
              }
          }
      }
  
      private PluginRepository() {
          // no-op
      }
  
      public static class PluginInfo {
          private final String url;
          private final String name;
          private final EndpointInfo info;
  
          public PluginInfo(final String url, String name, final EndpointInfo info) {
              this.url = url;
              this.name = name;
              this.info = info;
          }
  
          public String getUrl() {
              return url;
          }
  
          public String getName() {
              return name;
          }
  
          public Map<Pattern, Invoker> getInvokers() {
              return info.getInvokers();
          }
      }
  }