/*
    * 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.ds;
  
  import javax.annotation.concurrent.ThreadSafe;
  
  import de.smartics.properties.api.config.domain.Property;
  import de.smartics.properties.api.config.domain.PropertyCollection;
  import de.smartics.properties.api.config.domain.PropertyProvider;
  import de.smartics.properties.api.config.domain.PropertyStoreAccessor;
  import de.smartics.properties.api.config.domain.PropertyStoreCode;
  import de.smartics.properties.api.config.domain.PropertyStoreException;
  import de.smartics.properties.api.config.domain.PropertyStoreMessageBean;
  import de.smartics.properties.api.config.domain.SerializableConfigurationPropertiesManagement;
  import de.smartics.properties.api.config.domain.key.ConfigurationKey;
  import de.smartics.properties.api.core.domain.PropertyDescriptorRegistry;
  import de.smartics.properties.api.core.security.PropertyValueSecurity;
  import de.smartics.properties.spi.config.ds.DataSourceException;
  import de.smartics.properties.spi.config.ds.PropertiesStore;
  import de.smartics.properties.spi.config.support.AbstractExternalConfigurationPropertiesManagement;
  import de.smartics.properties.spi.config.support.SerializableConfigurationPropertiesManagementSpi;
  import de.smartics.util.lang.NullArgumentException;
  
  /**
   * Implementation based on a data source.
   */
  @ThreadSafe
  public final class DataSourceConfigurationProperties extends
      AbstractExternalConfigurationPropertiesManagement implements
      SerializableConfigurationPropertiesManagement,
      SerializableConfigurationPropertiesManagementSpi
  { // NOPMD
    // ********************************* Fields *********************************
  
    // --- constants ------------------------------------------------------------
  
    /**
     * The class version identifier.
     */
    private static final long serialVersionUID = 1L;
  
    // --- members --------------------------------------------------------------
  
    /**
     * The store containing properties.
     *
     * @serial
     */
    private final PropertiesStore store;
  
    /**
     * The helper to access properties in a property store directly.
     *
     * @serial
     */
    private final PropertyStoreAccessor propertyStoreAccessor =
        new DsPropertyStoreAccessor();
  
    // ****************************** Initializer *******************************
  
    // ****************************** Constructors ******************************
  
    /**
     * Default constructor.
     *
     * @param key the key that identifies the configuration.
     * @param registry the registry to resolve property descriptors.
     * @param store the store containing properties.
     * @param decrypter the helper to decrypt secured property values.
     * @throws NullArgumentException if {@code key}, {@code registry} or
     *           {@code decrypter} is <code>null</code>.
     */
    public DataSourceConfigurationProperties(final ConfigurationKey<?> key,
        final PropertyDescriptorRegistry registry, final PropertiesStore store,
        final PropertyValueSecurity decrypter) throws NullArgumentException
    {
      super(key, registry, decrypter);
  
      this.store = store;
    }
  
    // ****************************** Inner Classes *****************************
  
    /**
     * Provides direct access to the properties in the property store.
     */
   private final class DsPropertyStoreAccessor implements PropertyStoreAccessor
   {
     /**
      * The class version identifier.
      * <p>
      * The value of this constant is {@value}.
      * </p>
      */
     private static final long serialVersionUID = 1L;
 
     @Override
     public Property getPropertyFromStore(final String name)
       throws PropertyStoreException
     {
       try
       {
         final String config = getKey().toString();
         return store.getProperty(config, name);
       }
       catch (final DataSourceException e)
       {
         throw new PropertyStoreException(new PropertyStoreMessageBean(
             PropertyStoreCode.CANNOT_GET_PROPERTY, e, getKey(), name));
       }
     }
 
     @Override
     public Property setPropertyToStore(final String name, final String value)
       throws PropertyStoreException
     {
       try
       {
         final String config = getKey().toString();
         final Property oldProperty = getPropertyFromStore(name);
         store.setProperty(config, name, value);
         return oldProperty;
       }
       catch (final PropertyStoreException e)
       {
         throw new PropertyStoreException(new PropertyStoreMessageBean(
             PropertyStoreCode.CANNOT_SET_PROPERTY, e, getKey(), name));
       }
       catch (final DataSourceException e)
       {
         throw new PropertyStoreException(new PropertyStoreMessageBean(
             PropertyStoreCode.CANNOT_SET_PROPERTY, e, getKey(), name));
       }
     }
 
     @Override
     public Property deletePropertyInStore(final String name)
       throws PropertyStoreException
     {
       try
       {
         final String config = getKey().toString();
         final Property oldValue = getPropertyFromStore(name);
         store.deleteProperty(config, name);
         return oldValue;
       }
       catch (final DataSourceException e)
       {
         throw new PropertyStoreException(new PropertyStoreMessageBean(
             PropertyStoreCode.CANNOT_DELETE_PROPERTY, e, getKey(), name));
       }
     }
 
     @Override
     public PropertyCollection getPropertyCollectionFromStore()
       throws PropertyStoreException
     {
       try
       {
         final String config = getKey().toString();
         return store.getCollection(config);
       }
       catch (final DataSourceException e)
       {
         throw new PropertyStoreException(PropertyStoreMessageBean.collection(e,
             getKey()));
       }
     }
   }
 
   // ********************************* Methods ********************************
 
   // --- init -----------------------------------------------------------------
 
   // --- get&set --------------------------------------------------------------
 
   @Override
   public PropertyStoreAccessor getPropertyStoreAccessor()
   {
     return propertyStoreAccessor;
   }
 
   // --- business -------------------------------------------------------------
 
   @Override
   protected void setPropertiesToStore(final PropertyProvider provider)
   {
     store.setProperties(provider);
   }
 
   @Override
   public SerializableConfigurationPropertiesManagement toSerializable()
   {
     return this;
   }
 
   // --- object basics --------------------------------------------------------
 
 }