jdbm-partition/src/main/java/org/apache/directory/server/core/partition/impl/btree/jdbm/JdbmIndex.java [388:500]:
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    public synchronized void drop( PartitionTxn partitionTxn, K attrVal, String id ) throws LdapException
    {
        // The pair to be removed must exists
        if ( forward.has( partitionTxn, attrVal, id ) )
        {
            forward.remove( partitionTxn, attrVal, id );

            if ( withReverse )
            {
                reverse.remove( partitionTxn, id, attrVal );
            }
        }
    }


    /**
     * {@inheritDoc}
     */
    public void drop( PartitionTxn partitionTxn, String entryId ) throws LdapException
    {
        if ( withReverse )
        {
            if ( isDupsEnabled() )
            {
                // Build a cursor to iterate on all the keys referencing
                // this entryId
                Cursor<Tuple<String, K>> values = reverse.cursor( partitionTxn, entryId );

                try
                {
                    while ( values.next() )
                    {
                        // Remove the Key -> entryId from the index
                        forward.remove( partitionTxn, values.get().getValue(), entryId );
                    }
    
                    values.close();
                }
                catch ( CursorException | IOException e )
                {
                    throw new LdapOtherException( e.getMessage(), e );
                }
            }
            else
            {
                K key = reverse.get( partitionTxn, entryId );

                forward.remove( partitionTxn, key );
            }

            // Remove the id -> key from the reverse index
            reverse.remove( partitionTxn, entryId );
        }
    }


    // ------------------------------------------------------------------------
    // Index Cursor Operations
    // ------------------------------------------------------------------------
    @SuppressWarnings("unchecked")
    public Cursor<IndexEntry<K, String>> forwardCursor( PartitionTxn partitionTxn ) throws LdapException
    {
        return new IndexCursorAdaptor<>( partitionTxn, ( Cursor ) forward.cursor(), true );
    }


    public Cursor<IndexEntry<K, String>> forwardCursor( PartitionTxn partitionTxn, K key ) throws LdapException
    {
        return new IndexCursorAdaptor<>( partitionTxn, ( Cursor ) forward.cursor( partitionTxn, key ), true );
    }


    /**
     * {@inheritDoc}
     */
    @Override
    public Cursor<K> reverseValueCursor( PartitionTxn partitionTxn, String id ) throws LdapException
    {
        if ( withReverse )
        {
            return reverse.valueCursor( partitionTxn, id );
        }
        else
        {
            return new EmptyCursor<>();
        }
    }


    public Cursor<String> forwardValueCursor( PartitionTxn partitionTxn, K key ) throws LdapException
    {
        return forward.valueCursor( partitionTxn, key );
    }


    // ------------------------------------------------------------------------
    // Value Assertion (a.k.a Index Lookup) Methods //
    // ------------------------------------------------------------------------
    /**
     * {@inheritDoc}
     */
    public boolean forward( PartitionTxn partitionTxn, K attrVal ) throws LdapException
    {
        return forward.has( partitionTxn, attrVal );
    }


    /**
     * {@inheritDoc}
     */
    public boolean forward( PartitionTxn partitionTxn, K attrVal, String id ) throws LdapException
    {
        return forward.has( partitionTxn, attrVal, id );
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mavibot-partition/src/main/java/org/apache/directory/server/core/partition/impl/btree/mavibot/MavibotIndex.java [354:466]:
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    public synchronized void drop( PartitionTxn partitionTxn, K attrVal, String id ) throws LdapException
    {
        // The pair to be removed must exists
        if ( forward.has( partitionTxn, attrVal, id ) )
        {
            forward.remove( partitionTxn, attrVal, id );

            if ( withReverse )
            {
                reverse.remove( partitionTxn, id, attrVal );
            }
        }
    }


    /**
     * {@inheritDoc}
     */
    public void drop( PartitionTxn partitionTxn, String entryId ) throws LdapException
    {
        if ( withReverse )
        {
            if ( isDupsEnabled() )
            {
                // Build a cursor to iterate on all the keys referencing
                // this entryId
                Cursor<Tuple<String, K>> values = reverse.cursor( partitionTxn, entryId );

                try
                {
                    while ( values.next() )
                    {
                        // Remove the Key -> entryId from the index
                        forward.remove( partitionTxn, values.get().getValue(), entryId );
                    }
    
                    values.close();
                }
                catch ( CursorException | IOException e )
                {
                    throw new LdapOtherException( e.getMessage(), e );
                }
            }
            else
            {
                K key = reverse.get( partitionTxn, entryId );

                forward.remove( partitionTxn, key );
            }

            // Remove the id -> key from the reverse index
            reverse.remove( partitionTxn, entryId );
        }
    }


    // ------------------------------------------------------------------------
    // Index Cursor Operations
    // ------------------------------------------------------------------------
    @SuppressWarnings("unchecked")
    public Cursor<IndexEntry<K, String>> forwardCursor( PartitionTxn partitionTxn ) throws LdapException
    {
        return new IndexCursorAdaptor<>( partitionTxn, ( Cursor ) forward.cursor(), true );
    }


    public Cursor<IndexEntry<K, String>> forwardCursor( PartitionTxn partitionTxn, K key ) throws LdapException
    {
        return new IndexCursorAdaptor<>( partitionTxn, ( Cursor ) forward.cursor( partitionTxn, key ), true );
    }


    /**
     * {@inheritDoc}
     */
    @Override
    public Cursor<K> reverseValueCursor( PartitionTxn partitionTxn, String id ) throws LdapException
    {
        if ( withReverse )
        {
            return reverse.valueCursor( partitionTxn, id );
        }
        else
        {
            return new EmptyCursor<>();
        }
    }


    public Cursor<String> forwardValueCursor( PartitionTxn partitionTxn, K key ) throws LdapException
    {
        return forward.valueCursor( partitionTxn, key );
    }


    // ------------------------------------------------------------------------
    // Value Assertion (a.k.a Index Lookup) Methods //
    // ------------------------------------------------------------------------
    /**
     * {@inheritDoc}
     */
    public boolean forward( PartitionTxn partitionTxn, K attrVal ) throws LdapException
    {
        return forward.has( partitionTxn, attrVal );
    }


    /**
     * {@inheritDoc}
     */
    public boolean forward( PartitionTxn partitionTxn, K attrVal, String id ) throws LdapException
    {
        return forward.has( partitionTxn, attrVal, id );
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