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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.event;

import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import java.util.EventObject;

/*******************************************************************************
 * 
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 ******************************************************************************/
public final class MetadataPersistenceEvent extends EventObject
  {
    private static final long serialVersionUID = 8505342900873411611L;
    
    @Nonnull 
    private final Class propertySetClass;

    @Nonnull 
    private final String propertyName;

    @CheckForNull
    private final Object value;

    public MetadataPersistenceEvent (@Nonnull final Object source,
                                     @Nonnull final Class propertySetClass,
                                     @Nonnull final String propertyName,
                                     @CheckForNull final Object value) 
      {
        super(source);
        
        if (propertySetClass == null)
          {
            throw new IllegalArgumentException("propertySetClass is mandatory");
          }

        if (propertyName == null)
          {
            throw new IllegalArgumentException("propertyName is mandatory");
          }
        
        // value may be null

        this.propertySetClass = propertySetClass;
        this.propertyName = propertyName;
        this.value = value;
      }

    @Nonnull 
    public String getPropertyName() 
      {
        return propertyName;
      }  

    @Nonnull 
    public Class getPropertySetClass() 
      {
        return propertySetClass;
      }

    @CheckForNull
    public Object getValue() 
      {
        return value;
      }

    @Override
    public boolean equals (@CheckForNull final Object object)
      {
        if (object == null) 
          {
            return false;
          }
        
        if (getClass() != object.getClass())
          {
            return false;
          }
        
        final MetadataPersistenceEvent other = (MetadataPersistenceEvent)object;
        
        if (!this.propertySetClass.equals(other.propertySetClass))
          {
            return false;
          }
        
        if (!this.propertyName.equals(other.propertyName))
          {
            return false;
          }
        
        if (this.value != other.value && (this.value == null || !this.value.equals(other.value))) 
          {
            return false;
          }
        return true;
      }

    @Override
    public int hashCode()
      {
        int hash = 5;
        hash = 83 * hash + this.propertySetClass.hashCode();
        hash = 83 * hash + this.propertyName.hashCode();
        hash = 83 * hash + (this.value != null ? this.value.hashCode() : 0);
        return hash;
      }

    @Override
    @Nonnull
    public String toString() 
      {
        return String.format("MetadataPersistenceEvent[%s.%s=%s]", propertySetClass, propertyName, value);
      }
  }