1 # $Id: ZOOM.pm,v 1.6 2005-10-12 16:13:20 mike Exp $
12 return Net::Z3950::ZOOM::diag_str($code);
16 # Member naming convention: hash-element names which begin with an
17 # underscore represent underlying ZOOM-C object descriptors; those
18 # which lack them represent Perl's ZOOM objects. (The same convention
19 # is used in naming local variables where appropriate.)
21 # So, for example, the ZOOM::Connection class has an {_conn} element,
22 # which is a pointer to the ZOOM-C Connection object; but the
23 # ZOOM::ResultSet class has a {conn} element, which is a reference to
24 # the Perl-level Connection object by which it was created. (It may
25 # be that we find we have no need for these references, but for now
28 # To get at the underlying ZOOM-C connection object of a result-set
29 # (if you ever needed to do such a thing, which you probably don't)
30 # you'd use $rs->{conn}->_conn().
32 # ----------------------------------------------------------------------------
34 # The "Error" package contains constants returned as error-codes.
36 sub NONE { Net::Z3950::ZOOM::ERROR_NONE }
37 sub CONNECT { Net::Z3950::ZOOM::ERROR_CONNECT }
38 sub MEMORY { Net::Z3950::ZOOM::ERROR_MEMORY }
39 sub ENCODE { Net::Z3950::ZOOM::ERROR_ENCODE }
40 sub DECODE { Net::Z3950::ZOOM::ERROR_DECODE }
41 sub CONNECTION_LOST { Net::Z3950::ZOOM::ERROR_CONNECTION_LOST }
42 sub INIT { Net::Z3950::ZOOM::ERROR_INIT }
43 sub INTERNAL { Net::Z3950::ZOOM::ERROR_INTERNAL }
44 sub TIMEOUT { Net::Z3950::ZOOM::ERROR_TIMEOUT }
45 sub UNSUPPORTED_PROTOCOL { Net::Z3950::ZOOM::ERROR_UNSUPPORTED_PROTOCOL }
46 sub UNSUPPORTED_QUERY { Net::Z3950::ZOOM::ERROR_UNSUPPORTED_QUERY }
47 sub INVALID_QUERY { Net::Z3950::ZOOM::ERROR_INVALID_QUERY }
49 # The "Event" package contains constants returned by last_event()
51 sub NONE { Net::Z3950::ZOOM::EVENT_NONE }
52 sub CONNECT { Net::Z3950::ZOOM::EVENT_CONNECT }
53 sub SEND_DATA { Net::Z3950::ZOOM::EVENT_SEND_DATA }
54 sub RECV_DATA { Net::Z3950::ZOOM::EVENT_RECV_DATA }
55 sub TIMEOUT { Net::Z3950::ZOOM::EVENT_TIMEOUT }
56 sub UNKNOWN { Net::Z3950::ZOOM::EVENT_UNKNOWN }
57 sub SEND_APDU { Net::Z3950::ZOOM::EVENT_SEND_APDU }
58 sub RECV_APDU { Net::Z3950::ZOOM::EVENT_RECV_APDU }
59 sub RECV_RECORD { Net::Z3950::ZOOM::EVENT_RECV_RECORD }
60 sub RECV_SEARCH { Net::Z3950::ZOOM::EVENT_RECV_SEARCH }
63 # ----------------------------------------------------------------------------
65 package ZOOM::Exception;
69 my($code, $message, $addinfo) = @_;
85 return $this->{message};
90 return $this->{addinfo};
94 # ----------------------------------------------------------------------------
96 package ZOOM::Connection;
100 my($host, $port) = @_;
102 my $_conn = Net::Z3950::ZOOM::connection_new($host, $port);
103 my($errcode, $errmsg, $addinfo) = (undef, "dummy", "dummy");
104 $errcode = Net::Z3950::ZOOM::connection_error($_conn, $errmsg, $addinfo);
105 die new ZOOM::Exception($errcode, $errmsg, $addinfo) if $errcode;
114 # PRIVATE within this class
118 my $_conn = $this->{_conn};
119 die "{_conn} undefined: has this ResultSet been destroy()ed?"
127 my($key, $value) = @_;
129 my $oldval = Net::Z3950::ZOOM::connection_option_get($this->_conn(), $key);
130 Net::Z3950::ZOOM::connection_option_set($this->_conn(), $key, $value)
140 my $_rs = Net::Z3950::ZOOM::connection_search_pqf($this->_conn(), $query);
141 my($errcode, $errmsg, $addinfo) = (undef, "dummy", "dummy");
142 $errcode = Net::Z3950::ZOOM::connection_error($this->_conn(),
144 die new ZOOM::Exception($errcode, $errmsg, $addinfo) if $errcode;
146 return _new ZOOM::ResultSet($this, $query, $_rs);
152 Net::Z3950::ZOOM::connection_destroy($this->_conn());
153 $this->{_conn} = undef;
157 # ----------------------------------------------------------------------------
159 package ZOOM::ResultSet;
163 die "You can't create $class objects directly";
166 # PRIVATE to ZOOM::Connection::search()
169 my($conn, $query, $_rs) = @_;
178 # PRIVATE within this class
182 my $_rs = $this->{_rs};
183 die "{_rs} undefined: has this ResultSet been destroy()ed?"
192 return Net::Z3950::ZOOM::resultset_size($this->_rs());
199 my $_rec = Net::Z3950::ZOOM::resultset_record($this->_rs(), $which);
200 ### Check for error -- but how?
202 # For some reason, I have to use the explicit "->" syntax in order
203 # to invoke the ZOOM::Record constructor here, even though I don't
204 # have to do the same for _new ZOOM::ResultSet above. Weird.
205 return ZOOM::Record->_new($this, $which, $_rec);
211 Net::Z3950::ZOOM::resultset_destroy($this->_rs());
212 $this->{_rs} = undef;
216 # ----------------------------------------------------------------------------
218 package ZOOM::Record;
222 die "You can't create $class objects directly";
225 # PRIVATE to ZOOM::ResultSet::record()
228 my($rs, $which, $_rec) = @_;
237 # PRIVATE within this class
241 return $this->{_rec};
248 my $string = Net::Z3950::ZOOM::record_get($this->_rec(), "render", $len);
249 # I don't think we need '$len' at all. ### Probably the Perl-to-C
250 # glue code should use the value of `len' as well as the opaque
251 # data-pointer returned, to ensure that the SV contains all of the
252 # returned data and does not stop at the first NUL character in
253 # binary data. Carefully check the ZOOM_record_get() documentation.
261 my $string = Net::Z3950::ZOOM::record_get($this->_rec(), "raw", $len);
262 # See comment about $len in render()