core-avl/src/main/java/org/apache/directory/server/core/avltree/AvlSingletonOrOrderedSetCursor.java [163:264]:
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        throw new InvalidCursorPositionException();
    }


    /**
     * {@inheritDoc}
     */
    public boolean last() throws LdapException, CursorException
    {
        checkNotClosed();

        node = tree.getLast();

        if ( node == null )
        {
            position = Position.AFTER_LAST;
            return false;
        }
        else
        {
            position = Position.ON_NODE;
            return true;
        }
    }


    /**
     * {@inheritDoc}
     */
    public boolean next() throws LdapException, CursorException
    {
        checkNotClosed();

        switch ( position )
        {
            case BEFORE_FIRST:
                return first();

            case BEFORE_NODE:
                position = Position.ON_NODE;
                return true;

            case ON_NODE:
            case AFTER_NODE:
                node = node.next;

                if ( node == null )
                {
                    afterLast();

                    return false;
                }
                else
                {
                    position = Position.ON_NODE;
                    return true;
                }

            case AFTER_LAST:
                return false;

            default:
                throw new IllegalStateException( "Unexpected position " + position );
        }
    }


    /**
     * {@inheritDoc}
     */
    public boolean previous() throws LdapException, CursorException
    {
        checkNotClosed();

        switch ( position )
        {
            case BEFORE_FIRST:
                return false;

            case BEFORE_NODE:
            case ON_NODE:
                node = node.previous;
                if ( node == null )
                {
                    beforeFirst();
                    return false;
                }
                else
                {
                    position = Position.ON_NODE;
                    return true;
                }

            case AFTER_NODE:
                position = Position.ON_NODE;
                return true;

            case AFTER_LAST:
                return last();

            default:
                throw new IllegalStateException( "Unexpected position " + position );
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core-avl/src/main/java/org/apache/directory/server/core/avltree/AvlTreeCursor.java [188:287]:
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        throw new InvalidCursorPositionException();
    }


    /**
     * {@inheritDoc}
     */
    public boolean last() throws LdapException, CursorException
    {
        checkNotClosed();

        node = tree.getLast();

        if ( node == null )
        {
            position = Position.AFTER_LAST;
            return false;
        }
        else
        {
            position = Position.ON_NODE;
            return true;
        }
    }


    /**
     * {@inheritDoc}
     */
    public boolean next() throws LdapException, CursorException
    {
        checkNotClosed();

        switch ( position )
        {
            case BEFORE_FIRST:
                return first();

            case BEFORE_NODE:
                position = Position.ON_NODE;
                return true;

            case ON_NODE:
            case AFTER_NODE:
                node = node.next;
                if ( node == null )
                {
                    afterLast();
                    return false;
                }
                else
                {
                    position = Position.ON_NODE;
                    return true;
                }

            case AFTER_LAST:
                return false;

            default:
                throw new IllegalStateException( "Unexpected position " + position );
        }
    }


    /**
     * {@inheritDoc}
     */
    public boolean previous() throws LdapException, CursorException
    {
        checkNotClosed();

        switch ( position )
        {
            case BEFORE_FIRST:
                return false;

            case BEFORE_NODE:
            case ON_NODE:
                node = node.previous;
                if ( node == null )
                {
                    beforeFirst();
                    return false;
                }
                else
                {
                    position = Position.ON_NODE;
                    return true;
                }

            case AFTER_NODE:
                position = Position.ON_NODE;
                return true;

            case AFTER_LAST:
                return last();

            default:
                throw new IllegalStateException( "Unexpected position " + position );
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