/*
    * The contents of this file are subject to the terms of the Common Development and
    * Distribution License (the License). You may not use this file except in compliance with the
    * License.
    *
    * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
    * specific language governing permission and limitations under the License.
    *
    * When distributing Covered Software, include this CDDL Header Notice in each file and include
   * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
   * Header, with the fields enclosed by brackets [] replaced by your own identifying
   * information: "Portions copyright [year] [name of copyright owner]".
   *
   * Copyright 2015-2016 ForgeRock AS.
   */
  
  package org.forgerock.json.resource;
  
  import org.forgerock.api.annotations.CollectionProvider;
  import org.forgerock.api.annotations.Delete;
  import org.forgerock.api.annotations.Patch;
  import org.forgerock.api.annotations.Read;
  import org.forgerock.api.annotations.Update;
  import org.forgerock.services.context.Context;
  import org.forgerock.util.promise.Promise;
  
  /**
   * Exposes an annotated POJO as collection instance methods {@link org.forgerock.json.resource.RequestHandler} by
   * looking for annotated and/or conventionally-named methods (as per {@link CollectionProvider}).
   * <p>
   * This class will handle the requests to the collection's instance-level endpoint, so only Read, Update, Delete,
   * Patch and Action are implemented - the remaining methods delegate to the {@link InterfaceCollectionInstance} for
   * reporting the erroneous request to the caller.
   * {@see org.forgeock.json.resource.annotations}
   */
  class AnnotationCollectionInstance extends InterfaceCollectionInstance {
  
      private final AnnotatedMethod readMethod;
      private final AnnotatedMethod updateMethod;
      private final AnnotatedMethod deleteMethod;
      private final AnnotatedMethod patchMethod;
      private final AnnotatedActionMethods actionMethods;
  
      AnnotationCollectionInstance(Object requestHandler) {
          super(null);
          if (!requestHandler.getClass().isAnnotationPresent(CollectionProvider.class)) {
              throw new IllegalArgumentException("CollectionProvider missing from class: "
                      + requestHandler.getClass().getName());
          }
          this.readMethod = AnnotatedMethod.findMethod(requestHandler, Read.class, true);
          this.updateMethod = AnnotatedMethod.findMethod(requestHandler, Update.class, true);
          this.deleteMethod = AnnotatedMethod.findMethod(requestHandler, Delete.class, true);
          this.patchMethod = AnnotatedMethod.findMethod(requestHandler, Patch.class, true);
          this.actionMethods = AnnotatedActionMethods.findAll(requestHandler, true);
      }
  
      @Override
      public Promise<ResourceResponse, ResourceException> handleRead(Context context, ReadRequest request) {
          return readMethod.invoke(context, request, Resources.idOf(context));
      }
  
      @Override
      public Promise<ResourceResponse, ResourceException> handleUpdate(Context context, UpdateRequest request) {
          return updateMethod.invoke(context, request, Resources.idOf(context));
      }
  
      @Override
      public Promise<ResourceResponse, ResourceException> handleDelete(Context context, DeleteRequest request) {
          return deleteMethod.invoke(context, request, Resources.idOf(context));
      }
  
      @Override
      public Promise<ResourceResponse, ResourceException> handlePatch(Context context, PatchRequest request) {
          return patchMethod.invoke(context, request, Resources.idOf(context));
      }
  
      @Override
      public Promise<ActionResponse, ResourceException> handleAction(Context context, ActionRequest request) {
          return actionMethods.invoke(context, request, Resources.idOf(context));
      }
  }