/*

  * Copyright 2012-2013 smartics, Kronseder & Reiner GmbH

  *

  * Licensed 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 de.smartics.properties.spi.config.support;

 import java.util.ArrayList;

 import java.util.List;

 import de.smartics.properties.api.config.domain.key.ApplicationId;

 import de.smartics.properties.api.config.domain.key.ConfigurationKey;

 import de.smartics.properties.api.config.domain.key.EnvironmentId;

 import de.smartics.util.lang.NullArgumentException;

 /**

  * Explodes the key to its defaulting keys.

  */

 class KeySetBuilder

 {

   // ********************************* Fields *********************************

   // --- constants ------------------------------------------------------------

   // --- members --------------------------------------------------------------

   // ****************************** Initializer *******************************

   // ****************************** Constructors ******************************

   /**

    * Default constructor.

    */

   public KeySetBuilder()

   {

   }

   // ****************************** Inner Classes *****************************

   // ********************************* Methods ********************************

   // --- init -----------------------------------------------------------------

   // --- get&set --------------------------------------------------------------

   // --- business -------------------------------------------------------------

   public List<ConfigurationKey> createKeySet(final ConfigurationKey key)

   {

     final List<ConfigurationKey> list = new ArrayList<ConfigurationKey>();

     list.add(key);

     final EnvironmentId envId = key.getEnvironmentId();

     final ApplicationId appId = key.getApplicationId();

     addAppKeys(list, envId, appId);

     if (envId.getNode() != null)

     {

       final EnvironmentId defaultEnv = new EnvironmentId(envId.getName());

       if (!ApplicationId.ANY_APP.equals(appId))

       {

         if (appId.getVersion() != null)

         {

           final ConfigurationKey defaultKey =

               new ConfigurationKey(defaultEnv, appId);

           list.add(defaultKey);

         }

         addAppKeys(list, defaultEnv, appId);

       }

       else

       {

         list.add(new ConfigurationKey(defaultEnv, ApplicationId.ANY_APP));

       }

     }

     addAppKeyNoEnv(list, appId);

     final ConfigurationKey defaultKey =

         new ConfigurationKey(EnvironmentId.ANY_ENV, ApplicationId.ANY_APP);

     list.add(defaultKey);

     return list;

   }

   private void addAppKeys(final List<ConfigurationKey> list,

       final EnvironmentId envId, final ApplicationId appId)

     throws IllegalArgumentException, NullArgumentException

   {

     if (appId.getVersion() != null)

     {

       final ApplicationId defaultAppId =

           new ApplicationId(appId.getGroupId(), appId.getArtifactId(), null);

       final ConfigurationKey defaultKey =

           new ConfigurationKey(envId, defaultAppId);

       list.add(defaultKey);

     }

     if (appId.getArtifactId() != null)

     {

       final ApplicationId defaultAppId =

           new ApplicationId(appId.getGroupId(), null, null);

       final ConfigurationKey defaultKey =

           new ConfigurationKey(envId, defaultAppId);

       list.add(defaultKey);

     }

     if (appId.getGroupId() != null)

     {

       final ConfigurationKey defaultKey =

           new ConfigurationKey(envId, ApplicationId.ANY_APP);

       list.add(defaultKey);

     }

   }

   private void addAppKeyNoEnv(final List<ConfigurationKey> list,

       final ApplicationId appId) throws NullArgumentException,

     IllegalArgumentException

   {

     if (appId.getVersion() != null)

     {

       final ConfigurationKey defaultAppKey =

           new ConfigurationKey(EnvironmentId.ANY_ENV, appId);

       list.add(defaultAppKey);

     }

     if (appId.getArtifactId() != null)

     {

       final ApplicationId noEnvAppId =

           new ApplicationId(appId.getGroupId(), appId.getArtifactId(), null);

       final ConfigurationKey defaultAppKey =

           new ConfigurationKey(EnvironmentId.ANY_ENV, noEnvAppId);

       list.add(defaultAppKey);

     }

     if (appId.getGroupId() != null)

     {

       final ApplicationId noEnvAppId =

           new ApplicationId(appId.getGroupId(), null, null);

       final ConfigurationKey defaultAppKey =

           new ConfigurationKey(EnvironmentId.ANY_ENV, noEnvAppId);

       list.add(defaultAppKey);

     }

   }

   // --- object basics --------------------------------------------------------

 }