/*
    * 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 --------------------------------------------------------
 
 }