/*
    * Copyright 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.admin.domain.service;
  
  import static de.smartics.properties.admin.domain.service.ApplicationIdConfigurationLoader.ARCHIVE_TYPE;
  import static de.smartics.properties.admin.domain.service.ApplicationIdConfigurationLoader.ARTIFACT_ID;
  import static de.smartics.properties.admin.domain.service.ApplicationIdConfigurationLoader.CLASSIFIER;
  import static de.smartics.properties.admin.domain.service.ApplicationIdConfigurationLoader.GROUP_ID;
  import static de.smartics.properties.admin.domain.service.ApplicationIdConfigurationLoader.VERSION;
  
  import java.io.Serializable;
  
  import javax.naming.Context;
  import javax.naming.InitialContext;
  import javax.naming.NamingException;
  
  import org.apache.commons.lang.StringUtils;
  
  import de.smartics.properties.api.core.app.JndiContext;
  import de.smartics.properties.resource.domain.ArtifactId;
  
  /**
   * Responsible to read application identifier properties from the JNDI.
   */
  public class ApplicationIdConfigurationJndiLoader implements Serializable
  {
    // ********************************* Fields *********************************
  
    // --- constants ------------------------------------------------------------
  
    /**
     * The class version identifier.
     * <p>
     * The value of this constant is {@value}.
     * </p>
     */
    private static final long serialVersionUID = 1L;
  
    // --- members --------------------------------------------------------------
  
    // ****************************** Initializer *******************************
  
    // ****************************** Constructors ******************************
  
    /**
     * Default constructor.
     */
    public ApplicationIdConfigurationJndiLoader()
    {
    }
  
    // ****************************** Inner Classes *****************************
  
    // ********************************* Methods ********************************
  
    // --- init -----------------------------------------------------------------
  
    // --- get&set --------------------------------------------------------------
  
    // --- business -------------------------------------------------------------
  
    /**
     * Loads the application identifier configuration.
     *
     * @return the application identifier configuration.
     */
    public ArtifactId load()
    {
      try
      {
        final Context context = new InitialContext();
  
        final JndiContext lookup = JndiContext.boot(context);
        final String sourceId = lookup.getSourceId();
        final String groupId = lookup.lookup(GROUP_ID);
        final String artifactId = lookup.lookup(ARTIFACT_ID);
        final String version = lookup.lookup(VERSION);
        final String archiveType = lookup.lookup(ARCHIVE_TYPE);
        final String classifier = readClassifier(lookup);
        try
        {
          final ArtifactId applicationId =
              new ArtifactId.Builder().withGroupId(groupId).withName(artifactId)
                  .withVersion(version).withArchiveType(archiveType)
                  .withClassifier(classifier).build();
  
         return applicationId;
       }
       catch (final Exception e)
       {
         throw new IllegalStateException(String.format(
             "Cannot define the application identifier from JNDI %s: %s",
             sourceId, e.getMessage(), e));
       }
     }
     catch (final Exception e)
     {
       throw new IllegalStateException(String.format(
           "Cannot define the application identifier: %s", e.getMessage(), e));
     }
   }
 
   private static String readClassifier(final JndiContext lookup)
     throws NamingException
   {
 
     final String classifier = lookup.lookup(CLASSIFIER);
     if (StringUtils.isBlank(classifier))
     {
       return null;
     }
     return classifier;
   }
 
   // --- object basics --------------------------------------------------------
 
 }