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.\"
.IX Title "HTTP::Proxy::FilterStack 3pm"
.TH HTTP::Proxy::FilterStack 3pm "2011-07-03" "perl v5.12.4" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
HTTP::Proxy::FilterStack \- A class to manage filter stacks
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This class is used internally by \f(CW\*(C`HTTP::Proxy\*(C'\fR to manage its
four filter stacks.
.PP
From the point of view of \f(CW\*(C`HTTP::Proxy::FilterStack\*(C'\fR, a filter is
actually a (\f(CW\*(C`matchsub\*(C'\fR, \f(CW\*(C`filterobj\*(C'\fR) pair. The match subroutine
(generated by \f(CW\*(C`HTTP::Proxy\*(C'\fR's \f(CW\*(C`push_filter()\*(C'\fR method) is run
against the current \f(CW\*(C`HTTP::Message\*(C'\fR object to find out which filters
must be kept in the stack when handling this message.
.PP
The filter stack maintains a set of buffers where the filters can
store data. This data is appended at the beginning of the next
chunk of data, until all the data has been sent.
.SH "METHODS"
.IX Header "METHODS"
The class provides the following methods:
.ie n .IP "new( $isbody )" 4
.el .IP "new( \f(CW$isbody\fR )" 4
.IX Item "new( $isbody )"
Create a new instance of \f(CW\*(C`HTTP::Proxy::FilterStack\*(C'\fR. If \f(CW$isbody\fR
is true, then the stack will manage body filters (subclasses of
\&\f(CW\*(C`HTTP::Proxy::BodyFilter\*(C'\fR).
.ie n .IP "select_filters( $message )" 4
.el .IP "select_filters( \f(CW$message\fR )" 4
.IX Item "select_filters( $message )"
\&\f(CW$message\fR is the current \f(CW\*(C`HTTP::Message\*(C'\fR handled by the proxy.
It is used (with the help of each filter's match subroutine)
.ie n .IP "filter( @args )" 4
.el .IP "filter( \f(CW@args\fR )" 4
.IX Item "filter( @args )"
This method calls all the currently selected filters in turn,
with the appropriate arguments.
.IP "\fIfilter_last()\fR" 4
.IX Item "filter_last()"
This method calls all the currently selected filters in turn,
to filter the data remaining in the buffers in a single pass.
.IP "\fIwill_modify()\fR" 4
.IX Item "will_modify()"
Return a boolean value indicating if the list of selected filters in
the stack will modify the body content. The value is computed from the
result of calling \f(CW\*(C`will_modify()\*(C'\fR on all selected filters.
.IP "\fIall()\fR" 4
.IX Item "all()"
Return a list of all filters in the stack.
.IP "\fIeod()\fR" 4
.IX Item "eod()"
Used for \s-1END\s0 \s-1OF\s0 \s-1DATA\s0 bookkeeping.
.IP "\fIpush()\fR" 4
.IX Item "push()"
Push the given \f(CW\*(C`[ match, filterobj ]\*(C'\fR pairs at the top of the stack.
.ie n .IP "insert( $idx, @pairs )" 4
.el .IP "insert( \f(CW$idx\fR, \f(CW@pairs\fR )" 4
.IX Item "insert( $idx, @pairs )"
Insert the given \f(CW\*(C`[ match, filterobj ]\*(C'\fR pairs at position \f(CW$idx\fR
in the stack.
.ie n .IP "remove( $idx )" 4
.el .IP "remove( \f(CW$idx\fR )" 4
.IX Item "remove( $idx )"
Remove the \f(CW\*(C`[ match, filterobj ]\*(C'\fR pair at position \f(CW$idx\fR in the stack.
.SH "AUTHOR"
.IX Header "AUTHOR"
Philippe \*(L"BooK\*(R" Bruhat, <book@cpan.org>.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2002\-2006, Philippe Bruhat.
.SH "LICENSE"
.IX Header "LICENSE"
This module is free software; you can redistribute it or modify it under
the same terms as Perl itself.