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[catagits/Gitalist.git] / local-lib5 / man / man3 / Data::Stream::Bulk::DoneFlag.3pm

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.\" ========================================================================
.\"
.IX Title "Data::Stream::Bulk::DoneFlag 3"
.TH Data::Stream::Bulk::DoneFlag 3 "2009-06-26" "perl v5.8.7" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Data::Stream::Bulk::DoneFlag \- Implement the \f(CW\*(C`is_done\*(C'\fR method in terms of a
flag
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&        package Data::Stream::Bulk::Blah;
\&        use Moose;
\&
\&        with qw(Data::Stream::Bulk::DoneFlag);
\&
\&        sub get_more {
\&                if ( my @more = more() ) {
\&                        return \e@more;
\&                } else {
\&                        return;
\&                }
\&        }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This role implements the \f(CW\*(C`Data::Stream::Bulk\*(C'\fR core \s-1API\s0 in terms of one method
(\f(CW\*(C`get_more\*(C'\fR).
.PP
As a convenience it calls \f(CW\*(C`finished\*(C'\fR when the stream is exhausted, so that
cleanup may be done.
.PP
This is used by classes like Data::Stream::Bulk::DBI,
Data::Stream::Bulk::Callback.
.SH "METHODS"
.IX Header "METHODS"
.IP "is_done" 4
.IX Item "is_done"
Returns the state of the iterator.
.IP "next" 4
.IX Item "next"
As long as the iterator is not yet done, calls \f(CW\*(C`get_more\*(C'\fR.
.Sp
If \f(CW\*(C`get_more\*(C'\fR returned a false value instead of an array reference then
\&\f(CW\*(C`done\*(C'\fR is set, \f(CW\*(C`finished\*(C'\fR is called, and this \f(CW\*(C`next\*(C'\fR does nothing on
subsequent calls.
.IP "finished" 4
.IX Item "finished"
A noop by default. Can be overridden if so desired.
.SH "REQUIRED_METHODS"
.IX Header "REQUIRED_METHODS"
.IP "get_more" 4
.IX Item "get_more"
Returns the next block of data as an array ref, or a false value if no items
are left.