/*
    *  Licensed to the Apache Software Foundation (ASF) under one
    *  or more contributor license agreements.  See the NOTICE file
    *  distributed with this work for additional information
    *  regarding copyright ownership.  The ASF licenses this file
    *  to you 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 org.apache.directory.api.ldap.model.entry;
  
  
  import java.io.IOException;
  import java.io.ObjectInput;
  import java.io.ObjectOutput;
  
  import org.apache.directory.api.i18n.I18n;
  import org.apache.directory.api.ldap.model.exception.LdapException;
  import org.apache.directory.api.ldap.model.exception.LdapInvalidAttributeValueException;
  import org.apache.directory.api.ldap.model.schema.AttributeType;
  import org.apache.directory.api.ldap.model.schema.SchemaManager;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * An internal implementation for a ModificationItem. The name has been
   * chosen so that it does not conflict with @see ModificationItem
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class DefaultModification implements Modification
  {
      /** The modification operation */
      private ModificationOperation operation;
  
      /** The attribute which contains the modification */
      private Attribute attribute;
  
      /** The AtributeType */
      private AttributeType attributeType;
  
      /** logger for reporting errors that might not be handled properly upstream */
      protected static final Logger LOG = LoggerFactory.getLogger( Modification.class );
  
  
      /**
       * Creates a new instance of DefaultModification.
       */
      public DefaultModification()
      {
      }
  
  
      /**
       * Creates a new instance of DefaultModification.
       *
       * @param operation The modification operation
       * @param attribute The associated attribute 
       */
      public DefaultModification( ModificationOperation operation, Attribute attribute )
      {
          this.operation = operation;
          this.attribute = attribute;
      }
  
  
      /**
       * Creates a new instance of DefaultModification.
       *
       * @param operation The modification operation
       * @param attributeId The associated attribute ID
       * @param values the associated values
       */
      public DefaultModification( ModificationOperation operation, String attributeId, String... values )
      {
          this.operation = operation;
          this.attribute = new DefaultAttribute( attributeId, values );
      }
  
  
      /**
       * Creates a new instance of DefaultModification.
       *
       * @param operation The modification operation
       * @param attributeId The associated attribute ID
       * @param values the associated values
       */
      public DefaultModification( ModificationOperation operation, String attributeId, byte[]... values )
     {
         this.operation = operation;
         this.attribute = new DefaultAttribute( attributeId, values );
     }
 
 
     /**
      * Creates a new instance of DefaultModification.
      *
      * @param operation The modification operation
      * @param attributeId The associated attribute ID
      * @param values the associated values
      */
     public DefaultModification( ModificationOperation operation, String attributeId, Value<?>... values )
     {
         this.operation = operation;
         this.attribute = new DefaultAttribute( attributeId, values );
     }
 
 
     /**
      * Creates a new instance of DefaultModification with no value
      *
      * @param operation The modification operation
      * @param attributeId The associated attribute ID
      */
     public DefaultModification( ModificationOperation operation, String attributeId )
     {
         this.operation = operation;
         this.attribute = new DefaultAttribute( attributeId );
     }
 
 
     /**
      * Creates a new instance of DefaultModification.
      *
      * @param operation The modification operation
      * @param attributeType The associated attributeType
      * @param values the associated values
      */
     public DefaultModification( ModificationOperation operation, AttributeType attributeType, String... values )
         throws LdapInvalidAttributeValueException
     {
         this.operation = operation;
         this.attribute = new DefaultAttribute( attributeType, values );
     }
 
 
     /**
      * Creates a new instance of DefaultModification.
      *
      * @param operation The modification operation
      * @param attributeType The associated attributeType
      * @param values the associated values
      */
     public DefaultModification( ModificationOperation operation, AttributeType attributeType, byte[]... values )
         throws LdapInvalidAttributeValueException
     {
         this.operation = operation;
         this.attribute = new DefaultAttribute( attributeType, values );
     }
 
 
     /**
      * Creates a new instance of DefaultModification.
      *
      * @param operation The modification operation
      * @param attributeType The associated attributeType
      * @param values the associated values
      */
     public DefaultModification( ModificationOperation operation, AttributeType attributeType, Value<?>... values )
         throws LdapInvalidAttributeValueException
     {
         this.operation = operation;
         this.attribute = new DefaultAttribute( attributeType, values );
     }
 
 
     /**
      * Creates a new instance of DefaultModification with no value.
      *
      * @param operation The modification operation
      * @param attributeType The associated attributeType
      */
     public DefaultModification( ModificationOperation operation, AttributeType attributeType )
         throws LdapInvalidAttributeValueException
     {
         this.operation = operation;
         this.attribute = new DefaultAttribute( attributeType );
     }
 
 
     /**
      * Creates a new instance of DefaultModification.
      *
      * @param schemaManager The schema manager 
      * @param modification The modification
      */
     public DefaultModification( SchemaManager schemaManager, Modification modification )
     {
         operation = modification.getOperation();
 
         Attribute modAttribute = modification.getAttribute();
 
         try
         {
             AttributeType at = modAttribute.getAttributeType();
 
             if ( at == null )
             {
                 at = schemaManager.lookupAttributeTypeRegistry( modAttribute.getId() );
             }
 
             attribute = new DefaultAttribute( at, modAttribute );
         }
         catch ( LdapException ne )
         {
             // The attributeType is incorrect. Log, but do nothing otherwise.
             LOG.error( I18n.err( I18n.ERR_04472, modAttribute.getId() ) );
         }
     }
 
 
     /**
      * {@inheritDoc}
      */
     public ModificationOperation getOperation()
     {
         return operation;
     }
 
 
     /**
      * {@inheritDoc}
      */
     public void setOperation( int operation )
     {
         this.operation = ModificationOperation.getOperation( operation );
     }
 
 
     /**
      * {@inheritDoc}
      */
     public void setOperation( ModificationOperation operation )
     {
         this.operation = operation;
     }
 
 
     /**
      * {@inheritDoc}
      */
     public Attribute getAttribute()
     {
         return attribute;
     }
 
 
     /**
      * {@inheritDoc}
      */
     public void setAttribute( Attribute attribute )
     {
         this.attribute = attribute;
     }
 
 
     /**
      * {@inheritDoc}
      */
     public void apply( AttributeType attributeType ) throws LdapInvalidAttributeValueException
     {
         this.attributeType = attributeType;
 
         if ( attribute != null )
         {
             attribute.apply( attributeType );
         }
     }
 
 
     /**
      * {@inheritDoc}
      */
     public AttributeType getAttributeType()
     {
         return attributeType;
     }
 
 
     /**
      * @see Object#equals(Object)
      * @return <code>true</code> if both values are equal
      */
     public boolean equals( Object that )
     {
         // Basic equals checks
         if ( this == that )
         {
             return true;
         }
 
         if ( !( that instanceof Modification ) )
         {
             return false;
         }
 
         Modification otherModification = ( Modification ) that;
 
         // Check the operation
         if ( operation != otherModification.getOperation() )
         {
             return false;
         }
 
         // Check the attribute
         if ( attribute == null )
         {
             return otherModification.getAttribute() == null;
         }
 
         return attribute.equals( otherModification.getAttribute() );
     }
 
 
     /**
      * Compute the modification @see Object#hashCode
      * @return the instance's hash code 
      */
     public int hashCode()
     {
         int h = 37;
 
         h += h * 17 + operation.getValue();
         h += h * 17 + attribute.hashCode();
 
         return h;
     }
 
 
     /**
      * @see java.io.Externalizable#readExternal(ObjectInput)
      */
     public void readExternal( ObjectInput in ) throws IOException, ClassNotFoundException
     {
         // The operation
         operation = ModificationOperation.getOperation( in.readInt() );
 
         // The EntryAttribute if we have some
         boolean hasAttribute = in.readBoolean();
 
         if ( hasAttribute )
         {
             attribute = new DefaultAttribute();
             attribute.readExternal( in );
         }
     }
 
 
     /**
      * @see java.io.Externalizable#writeExternal(ObjectOutput)
      */
     public void writeExternal( ObjectOutput out ) throws IOException
     {
         // The operation
         out.writeInt( operation.getValue() );
 
         // The EntryAttribute if not null
         if ( attribute != null )
         {
             out.writeBoolean( true );
             attribute.writeExternal( out );
         }
         else
         {
             out.writeBoolean( false );
         }
 
         out.flush();
     }
 
 
     /**
      * {@inheritDoc}
      */
     public DefaultModification clone()
     {
         try
         {
             DefaultModification clone = ( DefaultModification ) super.clone();
 
             clone.attribute = this.attribute.clone();
             return clone;
         }
         catch ( CloneNotSupportedException cnse )
         {
             return null;
         }
     }
 
 
     /**
      * @see Object#toString()
      */
     public String toString()
     {
         StringBuilder sb = new StringBuilder();
 
         sb.append( "Modification: " ).
             append( operation ).
             append( "\n" ).
             append( ", attribute : " ).
             append( attribute );
 
         return sb.toString();
     }
 }