AsExtensionsBean.java

  1. /*
  2.  * *********************************************************************************************************************
  3.  *
  4.  * TheseFoolishThings: Miscellaneous utilities
  5.  * http://tidalwave.it/projects/thesefoolishthings
  6.  *
  7.  * Copyright (C) 2009 - 2021 by Tidalwave s.a.s. (http://tidalwave.it)
  8.  *
  9.  * *********************************************************************************************************************
  10.  *
  11.  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  12.  * the License. You may obtain a copy of the License at
  13.  *
  14.  *     http://www.apache.org/licenses/LICENSE-2.0
  15.  *
  16.  * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
  17.  * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the
  18.  * specific language governing permissions and limitations under the License.
  19.  *
  20.  * *********************************************************************************************************************
  21.  *
  22.  * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
  23.  * git clone https://github.com/tidalwave-it/thesefoolishthings-src
  24.  *
  25.  * *********************************************************************************************************************
  26.  */
  27. package it.tidalwave.role;

  28. import javax.annotation.Nonnull;
  29. import javax.inject.Inject;
  30. import java.util.List;
  31. import it.tidalwave.util.As;
  32. import it.tidalwave.util.NotFoundException;
  33. import it.tidalwave.role.spi.RoleManager;
  34. import org.springframework.beans.factory.annotation.Configurable;

  35. /***********************************************************************************************************************
  36.  *
  37.  * @author  Fabrizio Giudici
  38.  *
  39.  **********************************************************************************************************************/
  40. @Configurable
  41. public class AsExtensionsBean
  42.   {
  43.     @Inject @Nonnull
  44.     private RoleManager roleManager;

  45.     public <T> T as (@Nonnull final Object datum,
  46.                      @Nonnull final Class<T> roleType,
  47.                      @Nonnull final As.NotFoundBehaviour<T> notFoundBehaviour)
  48.       {
  49.         final List<? extends T> roles = asMany(datum, roleType);

  50.         if (roles.isEmpty())
  51.           {
  52.             return notFoundBehaviour.run(new NotFoundException("No " + roleType.getName() + " in " + datum));
  53.           }

  54.         return roles.get(0);
  55.       }

  56.     public <T> List<? extends T> asMany (@Nonnull final Object datum, @Nonnull final Class<T> roleType)
  57.       {
  58.         assert roleManager != null : "roleManager not present or not injected";
  59.         return roleManager.findRoles(datum, roleType);
  60.       }
  61.   }