1 # $Id: ZOOM.pm,v 1.19 2005-11-16 16:48:11 mike Exp $
11 # Member naming convention: hash-element names which begin with an
12 # underscore represent underlying ZOOM-C object descriptors; those
13 # which lack them represent Perl's ZOOM objects. (The same convention
14 # is used in naming local variables where appropriate.)
16 # So, for example, the ZOOM::Connection class has an {_conn} element,
17 # which is a pointer to the ZOOM-C Connection object; but the
18 # ZOOM::ResultSet class has a {conn} element, which is a reference to
19 # the Perl-level Connection object by which it was created. (It may
20 # be that we find we have no need for these references, but for now
23 # To get at the underlying ZOOM-C connection object of a result-set
24 # (if you ever needed to do such a thing, which you probably don't)
25 # you'd use $rs->{conn}->_conn().
27 # ----------------------------------------------------------------------------
29 # The "Error" package contains constants returned as error-codes.
31 sub NONE { Net::Z3950::ZOOM::ERROR_NONE }
32 sub CONNECT { Net::Z3950::ZOOM::ERROR_CONNECT }
33 sub MEMORY { Net::Z3950::ZOOM::ERROR_MEMORY }
34 sub ENCODE { Net::Z3950::ZOOM::ERROR_ENCODE }
35 sub DECODE { Net::Z3950::ZOOM::ERROR_DECODE }
36 sub CONNECTION_LOST { Net::Z3950::ZOOM::ERROR_CONNECTION_LOST }
37 sub INIT { Net::Z3950::ZOOM::ERROR_INIT }
38 sub INTERNAL { Net::Z3950::ZOOM::ERROR_INTERNAL }
39 sub TIMEOUT { Net::Z3950::ZOOM::ERROR_TIMEOUT }
40 sub UNSUPPORTED_PROTOCOL { Net::Z3950::ZOOM::ERROR_UNSUPPORTED_PROTOCOL }
41 sub UNSUPPORTED_QUERY { Net::Z3950::ZOOM::ERROR_UNSUPPORTED_QUERY }
42 sub INVALID_QUERY { Net::Z3950::ZOOM::ERROR_INVALID_QUERY }
43 # The following are added specifically for this OO interface
44 sub CREATE_QUERY { 20001 }
45 sub QUERY_CQL { 20002 }
46 sub QUERY_PQF { 20003 }
51 # The "Event" package contains constants returned by last_event()
53 sub NONE { Net::Z3950::ZOOM::EVENT_NONE }
54 sub CONNECT { Net::Z3950::ZOOM::EVENT_CONNECT }
55 sub SEND_DATA { Net::Z3950::ZOOM::EVENT_SEND_DATA }
56 sub RECV_DATA { Net::Z3950::ZOOM::EVENT_RECV_DATA }
57 sub TIMEOUT { Net::Z3950::ZOOM::EVENT_TIMEOUT }
58 sub UNKNOWN { Net::Z3950::ZOOM::EVENT_UNKNOWN }
59 sub SEND_APDU { Net::Z3950::ZOOM::EVENT_SEND_APDU }
60 sub RECV_APDU { Net::Z3950::ZOOM::EVENT_RECV_APDU }
61 sub RECV_RECORD { Net::Z3950::ZOOM::EVENT_RECV_RECORD }
62 sub RECV_SEARCH { Net::Z3950::ZOOM::EVENT_RECV_SEARCH }
64 # ----------------------------------------------------------------------------
71 # Special cases for error specific to the OO layer
72 if ($code == ZOOM::Error::CREATE_QUERY) {
73 return "can't create query object";
74 } elsif ($code == ZOOM::Error::QUERY_CQL) {
75 return "can't set CQL query";
76 } elsif ($code == ZOOM::Error::QUERY_PQF) {
77 return "can't set prefix query";
78 } elsif ($code == ZOOM::Error::SORTBY) {
79 return "can't set sort-specification";
80 } elsif ($code == ZOOM::Error::CLONE) {
81 return "can't clone record";
82 } elsif ($code == ZOOM::Error::PACKAGE) {
83 return "can't create package";
86 return Net::Z3950::ZOOM::diag_str($code);
90 my($code, $addinfo, $diagset) = @_;
92 die new ZOOM::Exception($code, diag_str($code), $addinfo, $diagset);
95 # ----------------------------------------------------------------------------
97 package ZOOM::Exception;
101 my($code, $message, $addinfo, $diagset) = @_;
107 diagset => $diagset || "ZOOM",
113 return $this->{code};
118 return $this->{message};
123 return $this->{addinfo};
128 return $this->{diagset};
133 my $res = "ZOOM error " . $this->code() . ' "' . $this->message() . '"';
134 $res .= ' (addinfo: "' . $this->addinfo() . '")' if $this->addinfo();
138 # This means that untrapped exceptions render nicely.
139 use overload '""' => \&render;
141 # ----------------------------------------------------------------------------
143 package ZOOM::Options;
151 $opts = Net::Z3950::ZOOM::options_create();
153 $opts = Net::Z3950::ZOOM::options_create_with_parent($p1->_opts());
155 $opts = Net::Z3950::ZOOM::options_create_with_parent2($p1->_opts(),
158 die "can't make $class object with more than 2 parents";
166 # PRIVATE to this class and ZOOM::Connection::create() and
167 # ZOOM::Connection::package()
172 my $_opts = $this->{_opts};
173 die "{_opts} undefined: has this Options block been destroy()ed?"
181 my($key, $value) = @_;
183 my $oldval = Net::Z3950::ZOOM::options_get($this->_opts(), $key);
184 Net::Z3950::ZOOM::options_set($this->_opts(), $key, $value)
192 my($key, $value) = @_;
195 my $oldval = Net::Z3950::ZOOM::options_getl($this->_opts(),
197 Net::Z3950::ZOOM::options_setl($this->_opts(), $key,
198 $value, length($value))
204 # This is a bit stupid, since the scalar values that Perl returns from
205 # option() can be used as a boolean; but it's just possible that some
206 # applications will rely on ZOOM_options_get_bool()'s idiosyncratic
207 # interpretation of what constitutes truth.
211 my($key, $default) = @_;
213 return Net::Z3950::ZOOM::options_get_bool($this->_opts(), $key, $default);
216 # .. and the next two are even more stupid
219 my($key, $default) = @_;
221 return Net::Z3950::ZOOM::options_get_int($this->_opts(), $key, $default);
226 my($key, $value) = @_;
228 Net::Z3950::ZOOM::options_set_int($this->_opts(), $key, $value);
231 # ### Feel guilty. Feel very, very guilty. I've not been able to
232 # get the callback memory-management right in "ZOOM.xs", with
233 # the result that the values of $function and $udata passed into
234 # this function, which are on the stack, have sometimes been
235 # freed by the time they're used by __ZOOM_option_callback(),
236 # with hilarious results. To avoid this, I copy the values into
237 # module-scoped globals, and pass _those_ into the extension
238 # function. To avoid overwriting those globals by subsequent
239 # calls, I keep all the old ones, pushed onto the @_function and
240 # @_udata arrays, which means that THIS FUNCTION LEAKS MEMORY
241 # LIKE IT'S GOING OUT OF FASHION. Not nice. One day, I should
242 # fix this, but for now there's more important fish to fry.
244 my(@_function, @_udata);
247 my($function, $udata) = @_;
249 push @_function, $function;
250 push @_udata, $udata;
251 Net::Z3950::ZOOM::options_set_callback($o1->_opts(),
252 $_function[-1], $_udata[-1]);
258 Net::Z3950::ZOOM::options_destroy($this->_opts());
259 $this->{_opts} = undef;
263 # ----------------------------------------------------------------------------
265 package ZOOM::Connection;
269 my($host, $port) = @_;
271 my $_conn = Net::Z3950::ZOOM::connection_new($host, $port || 0);
281 # PRIVATE to this class
285 my $_conn = $this->{_conn};
286 die "{_conn} undefined: has this Connection been destroy()ed?"
295 my($errcode, $errmsg, $addinfo, $diagset) = (undef, "x", "x", "x");
296 $errcode = Net::Z3950::ZOOM::connection_error_x($this->_conn(), $errmsg,
298 die new ZOOM::Exception($errcode, $errmsg, $addinfo, $diagset)
306 my $_conn = Net::Z3950::ZOOM::connection_create($options->_opts());
317 my($errcode, $errmsg, $addinfo, $diagset) = (undef, "dummy", "dummy", "d");
318 $errcode = Net::Z3950::ZOOM::connection_error_x($this->_conn(), $errmsg,
320 return ($errcode, $errmsg, $addinfo, $diagset);
325 return Net::Z3950::ZOOM::connection_errcode($this->_conn());
330 return Net::Z3950::ZOOM::connection_errmsg($this->_conn());
335 return Net::Z3950::ZOOM::connection_addinfo($this->_conn());
340 return Net::Z3950::ZOOM::connection_diagset($this->_conn());
345 my($host, $port) = @_;
347 Net::Z3950::ZOOM::connection_connect($this->_conn(), $host, $port);
354 my($key, $value) = @_;
356 my $oldval = Net::Z3950::ZOOM::connection_option_get($this->_conn(), $key);
357 Net::Z3950::ZOOM::connection_option_set($this->_conn(), $key, $value)
365 my($key, $value) = @_;
368 my $oldval = Net::Z3950::ZOOM::connection_option_getl($this->_conn(),
370 Net::Z3950::ZOOM::connection_option_setl($this->_conn(), $key,
371 $value, length($value))
381 my $_rs = Net::Z3950::ZOOM::connection_search($this->_conn(),
384 return _new ZOOM::ResultSet($this, $query, $_rs);
391 my $_rs = Net::Z3950::ZOOM::connection_search_pqf($this->_conn(), $pqf);
393 return _new ZOOM::ResultSet($this, $pqf, $_rs);
400 my $_ss = Net::Z3950::ZOOM::connection_scan($this->_conn(), $startterm);
402 return _new ZOOM::ScanSet($this, $startterm, $_ss);
409 my $_o = defined $options ? $options->_opts() :
410 Net::Z3950::ZOOM::options_create();
411 my $_p = Net::Z3950::ZOOM::connection_package($this->_conn(), $_o)
412 or ZOOM::_oops(ZOOM::Error::PACKAGE);
414 return _new ZOOM::Package($this, $options, $_p);
420 Net::Z3950::ZOOM::connection_destroy($this->_conn());
421 $this->{_conn} = undef;
425 # ----------------------------------------------------------------------------
431 die "You can't create $class objects: it's a virtual base class";
434 # PRIVATE to this class and ZOOM::Connection::search()
438 my $_query = $this->{_query};
439 die "{_query} undefined: has this Query been destroy()ed?"
449 Net::Z3950::ZOOM::query_sortby($this->_query(), $sortby) == 0
450 or ZOOM::_oops(ZOOM::Error::SORTBY, $sortby);
456 Net::Z3950::ZOOM::query_destroy($this->_query());
457 $this->{_query} = undef;
461 package ZOOM::Query::CQL;
462 our @ISA = qw(ZOOM::Query);
468 my $q = Net::Z3950::ZOOM::query_create()
469 or ZOOM::_oops(ZOOM::Error::CREATE_QUERY);
470 Net::Z3950::ZOOM::query_cql($q, $string) == 0
471 or ZOOM::_oops(ZOOM::Error::QUERY_CQL, $string);
479 package ZOOM::Query::PQF;
480 our @ISA = qw(ZOOM::Query);
486 my $q = Net::Z3950::ZOOM::query_create()
487 or ZOOM::_oops(ZOOM::Error::CREATE_QUERY);
488 Net::Z3950::ZOOM::query_prefix($q, $string) == 0
489 or ZOOM::_oops(ZOOM::Error::QUERY_PQF, $string);
497 # ----------------------------------------------------------------------------
499 package ZOOM::ResultSet;
503 die "You can't create $class objects directly";
506 # PRIVATE to ZOOM::Connection::search() and ZOOM::Connection::search_pqf()
509 my($conn, $query, $_rs) = @_;
513 query => $query, # This is not currently used, which is
514 # just as well since it could be
515 # either a string (when the RS is
516 # created with search_pqf()) or a
517 # ZOOM::Query object (when it's
518 # created with search())
523 # PRIVATE to this class
527 my $_rs = $this->{_rs};
528 die "{_rs} undefined: has this ResultSet been destroy()ed?"
536 my($key, $value) = @_;
538 my $oldval = Net::Z3950::ZOOM::resultset_option_get($this->_rs(), $key);
539 Net::Z3950::ZOOM::resultset_option_set($this->_rs(), $key, $value)
548 return Net::Z3950::ZOOM::resultset_size($this->_rs());
555 my $_rec = Net::Z3950::ZOOM::resultset_record($this->_rs(), $which);
556 ### Check for error -- but how?
557 return undef if !defined $_rec;
559 # For some reason, I have to use the explicit "->" syntax in order
560 # to invoke the ZOOM::Record constructor here, even though I don't
561 # have to do the same for _new ZOOM::ResultSet above. Weird.
562 return ZOOM::Record->_new($this, $which, $_rec);
565 sub record_immediate {
569 my $_rec = Net::Z3950::ZOOM::resultset_record_immediate($this->_rs(),
571 ### Check for error -- but how?
572 return undef if !defined $_rec;
574 return ZOOM::Record->_new($this, $which, $_rec);
580 Net::Z3950::ZOOM::resultset_cache_reset($this->_rs());
585 my($start, $count, $return_records) = @_;
587 my $raw = Net::Z3950::ZOOM::resultset_records($this->_rs(), $start, $count,
589 ### Why don't we throw an exception if $raw is undefined?
590 return undef if !defined $raw;
592 # We need to package up the returned records in ZOOM::Record objects
594 for my $i (0 .. @$raw-1) {
595 my $_rec = $raw->[$i];
596 if (!defined $_rec) {
599 push @res, ZOOM::Record->_new($this, $start+$i, $_rec);
608 my($sort_type, $sort_spec) = @_;
610 return Net::Z3950::ZOOM::resultset_sort1($this->_rs(),
611 $sort_type, $sort_spec);
617 Net::Z3950::ZOOM::resultset_destroy($this->_rs());
618 $this->{_rs} = undef;
622 # ----------------------------------------------------------------------------
624 package ZOOM::Record;
628 die "You can't create $class objects directly";
631 # PRIVATE to ZOOM::ResultSet::record(),
632 # ZOOM::ResultSet::record_immediate(), ZOOM::ResultSet::records() and
633 # ZOOM::Record::clone()
637 my($rs, $which, $_rec) = @_;
646 # PRIVATE to this class
650 my $_rec = $this->{_rec};
651 die "{_rec} undefined: has this Record been destroy()ed?"
661 my $string = Net::Z3950::ZOOM::record_get($this->_rec(), "render", $len);
662 # I don't think we need '$len' at all. ### Probably the Perl-to-C
663 # glue code should use the value of `len' as well as the opaque
664 # data-pointer returned, to ensure that the SV contains all of the
665 # returned data and does not stop at the first NUL character in
666 # binary data. Carefully check the ZOOM_record_get() documentation.
674 my $string = Net::Z3950::ZOOM::record_get($this->_rec(), "raw", $len);
675 # See comment about $len in render()
682 my $raw = Net::Z3950::ZOOM::record_clone($this->_rec())
683 or ZOOM::_oops(ZOOM::Error::CLONE);
685 # Arg 1 (rs) is undefined as the new record doesn't belong to an RS
686 return _new ZOOM::Record(undef, undef, $raw);
692 Net::Z3950::ZOOM::record_destroy($this->_rec());
693 $this->{_rec} = undef;
697 # ----------------------------------------------------------------------------
699 package ZOOM::ScanSet;
703 die "You can't create $class objects directly";
706 # PRIVATE to ZOOM::Connection::scan(),
709 my($conn, $startterm, $_ss) = @_;
713 startterm => $startterm,
718 # PRIVATE to this class
722 my $_ss = $this->{_ss};
723 die "{_ss} undefined: has this ScanSet been destroy()ed?"
731 my($key, $value) = @_;
733 my $oldval = Net::Z3950::ZOOM::scanset_option_get($this->_ss(), $key);
734 Net::Z3950::ZOOM::scanset_option_set($this->_ss(), $key, $value)
743 return Net::Z3950::ZOOM::scanset_size($this->_ss());
750 my($occ, $len) = (0, 0);
751 my $term = Net::Z3950::ZOOM::scanset_term($this->_ss(), $which,
754 return undef if !defined $term;
755 die "length of term '$term' differs from returned len=$len"
756 if length($term) != $len;
758 return ($term, $occ);
765 my($occ, $len) = (0, 0);
766 my $term = Net::Z3950::ZOOM::scanset_display_term($this->_ss(), $which,
769 return undef if !defined $term;
770 die "length of display term '$term' differs from returned len=$len"
771 if length($term) != $len;
773 return ($term, $occ);
779 Net::Z3950::ZOOM::scanset_destroy($this->_ss());
780 $this->{_ss} = undef;
784 # ----------------------------------------------------------------------------
786 package ZOOM::Package;
790 die "You can't create $class objects directly";
793 # PRIVATE to ZOOM::Connection::package(),
796 my($conn, $options, $_p) = @_;
805 # PRIVATE to this class
809 my $_p = $this->{_p};
810 die "{_p} undefined: has this Package been destroy()ed?"
818 my($key, $value) = @_;
820 my $oldval = Net::Z3950::ZOOM::package_option_get($this->_p(), $key);
821 Net::Z3950::ZOOM::package_option_set($this->_p(), $key, $value)
831 Net::Z3950::ZOOM::package_send($this->_p(), $type);
832 $this->{conn}->_check();
838 Net::Z3950::ZOOM::package_destroy($this->_p());