/*
    * 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.jndi;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.naming.NameClassPair;
  import javax.naming.NamingEnumeration;
  import javax.naming.NamingException;
  
  import de.smartics.properties.api.config.domain.Property;
  import de.smartics.properties.api.config.domain.PropertyCollection;
  import de.smartics.properties.api.config.domain.PropertyStoreAccessor;
  import de.smartics.properties.api.config.domain.key.ConfigurationKey;
  import de.smartics.properties.api.core.app.JndiContext;
  import de.smartics.properties.spi.config.support.NativePropertyCollection;
  
  /**
   * Provides direct access to the properties in the property store.
   */
  final class JndiPropertyStoreAccessor implements PropertyStoreAccessor
  {
    // ********************************* Fields *********************************
  
    // --- constants ------------------------------------------------------------
  
    /**
     * The class version identifier.
     * <p>
     * The value of this constant is {@value}.
     * </p>
     */
    private static final long serialVersionUID = 1L;
  
    // --- members --------------------------------------------------------------
  
    /**
     * The key that identifies the configuration.
     */
    private final ConfigurationKey<?> key;
  
    /**
     * The reference to the configuration within the JNDI context.
     */
    private final JndiContext context;
  
    // ****************************** Initializer *******************************
  
    // ****************************** Constructors ******************************
  
    JndiPropertyStoreAccessor(final ConfigurationKey<?> key,
        final JndiContext context)
    {
      this.key = key;
      this.context = context;
    }
  
    // ****************************** Inner Classes *****************************
  
    // ********************************* Methods ********************************
  
    // --- init -----------------------------------------------------------------
  
    // --- get&set --------------------------------------------------------------
  
    // --- business -------------------------------------------------------------
  
    @Override
    public Property getPropertyFromStore(final String name)
      throws JndiPropertyStoreException
    {
      try
      {
        final String value = context.lookup(name);
        final Property property =
            new Property(context.getSourceId(), name, value);
        return property;
      }
      catch (final NamingException e)
      {
        throw new JndiPropertyStoreException(new JndiPropertyStoreMessageBean(
            JndiPropertyStoreCode.CANNOT_GET_PROPERTY, e, key, name));
      }
    }
  
   @Override
   public Property setPropertyToStore(final String name, final String value)
     throws JndiPropertyStoreException
   {
     try
     {
       final Property oldProperty = getPropertyFromStore(name);
       context.set(name, value);
       return oldProperty;
     }
     catch (final NamingException e)
     {
       throw new JndiPropertyStoreException(new JndiPropertyStoreMessageBean(
           JndiPropertyStoreCode.CANNOT_SET_PROPERTY, e, key, name));
     }
   }
 
   @Override
   public Property deletePropertyInStore(final String name)
     throws JndiPropertyStoreException
   {
     try
     {
       final Property oldProperty = getPropertyFromStore(name);
       context.set(name, null);
       return oldProperty;
     }
     catch (final NamingException e)
     {
       throw new JndiPropertyStoreException(new JndiPropertyStoreMessageBean(
           JndiPropertyStoreCode.CANNOT_DELETE_PROPERTY, e, key, name));
     }
   }
 
   @Override
   public PropertyCollection getPropertyCollectionFromStore()
     throws JndiPropertyStoreException
   {
     try
     {
       final Map<String, Property> properties = new HashMap<String, Property>();
       final NamingEnumeration<NameClassPair> list = context.list();
       while (list.hasMore())
       {
         final NameClassPair pair = list.next();
         final String name = pair.getName();
         final Property property = getPropertyFromStore(name);
         properties.put(name, property);
       }
 
       return new NativePropertyCollection(properties);
     }
     catch (final NamingException e)
     {
       throw new JndiPropertyStoreException(
           JndiPropertyStoreMessageBean.collection(e, key));
     }
   }
 
   // --- object basics --------------------------------------------------------
 
   @Override
   public String toString()
   {
     return context.getSourceId();
   }
 }