/*

  * 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.impl.config.domain.key.envapp;

 import static org.apache.commons.lang.StringUtils.defaultIfBlank;

 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.ConfigurationKeyFactory;

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

 /**

  * Factory for configuration keys.

  */

 final class EnvAppConfigurationKeyFactory implements

     ConfigurationKeyFactory<EnvAppConfigurationKey>

 {

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

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

   /**

    * The default key referencing any environment and any application.

    */

   private static final EnvAppConfigurationKey DEFAULT =

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

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

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

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

   /**

    * Default constructor.

    */

   EnvAppConfigurationKeyFactory()

   {

   }

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

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

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

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

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

   @Override

   public EnvAppConfigurationKey createDefaultKey()

   {

     return DEFAULT;

   }

   @Override

   public ConfigurationKey<?> createKey(final ApplicationId applicationId)

   {

     final ConfigurationKey<?> key =

         new EnvAppConfigurationKey(EnvironmentId.ANY_ENV, applicationId);

     return key;

   }

   @Override

   public ConfigurationKey<?> createUniqueKey(final String id)

   {

     return new EnvAppConfigurationKey(new EnvironmentId(id),

         ApplicationId.ANY_APP);

   }

   @Override

   public ConfigurationKey<?> createKey(final ConfigurationKey<?> key,

       final ApplicationId appId)

   {

     final ConfigurationKey<?> newKey =

         new EnvAppConfigurationKey((EnvAppConfigurationKey) key, appId);

     return newKey;

   }

   @Override

   public ConfigurationKey<?> createKeyFromString(final String key)

     throws IllegalArgumentException

   {

     if (key == null)

     {

       throw new IllegalArgumentException(String.format(

           "Cannot parse key '%s', since key is null", key));

     }

     final String[] keyArray = key.split("/", -1);

     final int count = keyArray.length;

     final int expectedCount = 2;

     if (count != expectedCount)

     {

       throw new IllegalArgumentException(String.format(

           "Cannot parse key '%s', since %s slash-separated elements are expected,"

               + " but found only %s.", key, expectedCount, count));

     }

     final EnvironmentId environmentId =

         EnvironmentId.valueOf(defaultIfBlank(keyArray[0], null));

     final ApplicationId applicationId =

         ApplicationId.valueOf(defaultIfBlank(keyArray[1], null));

     final ConfigurationKey<?> newKey =

         new EnvAppConfigurationKey(environmentId, applicationId);

     return newKey;

   }

   @Override

   public ConfigurationKey<?> createStaticKey(final ConfigurationKey<?> key)

   {

     return new EnvAppConfigurationKey((EnvAppConfigurationKey) key,

         ((EnvAppConfigurationKey) key).getApplicationId());

   }

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

 }