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/***********************************************************************************************************************
 *
 * blueMarine Metadata - open source media workflow
 * Copyright (C) 2007-2011 by Tidalwave s.a.s. (http://www.tidalwave.it)
 *
 ***********************************************************************************************************************
 *
 * 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.
 *
 ***********************************************************************************************************************
 *
 * WWW: http://bluemarine.tidalwave.it
 * SCM: https://kenai.com/hg/bluemarine~metadata-src
 *
 **********************************************************************************************************************/
package it.tidalwave.metadata.persistence.spi;

import javax.annotation.Nonnull;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import it.tidalwave.util.logging.Logger;
import org.openide.loaders.DataObject;
import it.tidalwave.metadata.Metadata.FindOption;
import it.tidalwave.metadata.Metadata.StorageType;
import it.tidalwave.metadata.Metadata.StoreOption;
import it.tidalwave.metadata.MetadataItemHolder;
import it.tidalwave.metadata.spi.MetadataItemSourceSinkSupport;
      
class PersistenceMetadataHolder extends MetadataItemHolder
  {
    private static final long serialVersionUID = 351706783745243051L;
    
    public PersistenceMetadataHolder (@Nonnull final Item bean, 
                                      @Nonnull final Date latestModificationTime) 
      {
        super(bean, null, "Persistence", latestModificationTime);
      }

    @Override
    public boolean isAvailable() 
      {
        return true; // If an item is in the persistence, it's available by default
      }
  }

/*******************************************************************************
 *
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 ******************************************************************************/
public class MetadataItemPersistenceSupport extends MetadataItemSourceSinkSupport
  {
    private final static String CLASS = MetadataItemPersistenceSupport.class.getName();
    private final static Logger logger = Logger.getLogger(CLASS);
    
    @Nonnull 
    private final String propertySetName;
    
    @Nonnull 
    protected final MetadataPersistenceSpi persistenceSpi = MetadataPersistenceSpi.Locator.findPersistenceSpi();

    /***************************************************************************
     *
     *
     **************************************************************************/
    public MetadataItemPersistenceSupport (@Nonnull final Class itemClass, 
                                           @Nonnull final String name, 
                                           @Nonnull final StorageType storageType, 
                                           @Nonnull final String propertySetName) 
      {
        super(itemClass, name, storageType);
        this.propertySetName = propertySetName;
      }
      
    /***************************************************************************
     *
     * {@inheritDocs}
     *
     **************************************************************************/
    @Nonnull 
    public Collection> loadMetadataItems (@Nonnull final DataObject dataObject,
                                                                   @Nonnull final FindOption ... options)
      throws Exception
      {
        logger.fine("loadMetadataItem(%s, %s)", dataObject, Arrays.toString(options));
        final Item item = createInstance();
        final Date timestamp = new Date(0); // FIXME: get from database
        final MetadataItemHolder holder = new PersistenceMetadataHolder(item, timestamp);
        persistenceSpi.refresh(dataObject, holder);
        return Collections.singletonList(holder);
      }

    /***************************************************************************
     *
     * {@inheritDocs}
     *
     **************************************************************************/
    public void storeMetadataItem (@Nonnull final DataObject dataObject, 
                                   @Nonnull final MetadataItemHolder holder, 
                                   @Nonnull final StoreOption... options)
      throws Exception
      {
        logger.fine("storeMetadataItem(%s, %s, %s)", dataObject, holder, Arrays.toString(options));
        persistenceSpi.manage(dataObject, holder, options);
      }
    
    /***************************************************************************
     *
     * {@inheritDocs}
     *
     **************************************************************************/
    @Nonnull 
    public String getPropertySetName()
      {
        return propertySetName;
      }
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    @Nonnull 
    protected Item createInstance()
      {
        try 
          {
            return getItemClass().newInstance();
          }
        catch (InstantiationException e) 
          {
            throw new RuntimeException(e);
          } 
        catch (IllegalAccessException e) 
          {
            throw new RuntimeException(e);
          }
      }
  }