X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=lib%2FZOOM.pm;h=6b2f8c985b12b9c64addf7531872b3324412e1f3;hb=HEAD;hp=4fd85023144b1239e050e3f63e9b151c99bbafb4;hpb=07c4793d97e8ecd805df97ad36164384bc15bb2b;p=ZOOM-Perl-moved-to-github.git

diff --git a/lib/ZOOM.pm b/lib/ZOOM.pm
index 4fd8502..6b2f8c9 100644
--- a/lib/ZOOM.pm
+++ b/lib/ZOOM.pm
@@ -1,13 +1,11 @@
-# $Id: ZOOM.pm,v 1.14 2005-11-08 11:46:59 mike Exp $
-
 use strict;
 use warnings;
+use IO::File;
 use Net::Z3950::ZOOM;
 
 
 package ZOOM;
 
-
 # Member naming convention: hash-element names which begin with an
 # underscore represent underlying ZOOM-C object descriptors; those
 # which lack them represent Perl's ZOOM objects.  (The same convention
@@ -34,18 +32,41 @@ sub MEMORY { Net::Z3950::ZOOM::ERROR_MEMORY }
 sub ENCODE { Net::Z3950::ZOOM::ERROR_ENCODE }
 sub DECODE { Net::Z3950::ZOOM::ERROR_DECODE }
 sub CONNECTION_LOST { Net::Z3950::ZOOM::ERROR_CONNECTION_LOST }
-sub INIT { Net::Z3950::ZOOM::ERROR_INIT }
+sub ZINIT { Net::Z3950::ZOOM::ERROR_INIT }
 sub INTERNAL { Net::Z3950::ZOOM::ERROR_INTERNAL }
 sub TIMEOUT { Net::Z3950::ZOOM::ERROR_TIMEOUT }
 sub UNSUPPORTED_PROTOCOL { Net::Z3950::ZOOM::ERROR_UNSUPPORTED_PROTOCOL }
 sub UNSUPPORTED_QUERY { Net::Z3950::ZOOM::ERROR_UNSUPPORTED_QUERY }
 sub INVALID_QUERY { Net::Z3950::ZOOM::ERROR_INVALID_QUERY }
+sub CQL_PARSE { Net::Z3950::ZOOM::ERROR_CQL_PARSE }
+sub CQL_TRANSFORM { Net::Z3950::ZOOM::ERROR_CQL_TRANSFORM }
+sub CCL_CONFIG { Net::Z3950::ZOOM::ERROR_CCL_CONFIG }
+sub CCL_PARSE { Net::Z3950::ZOOM::ERROR_CCL_PARSE }
 # The following are added specifically for this OO interface
 sub CREATE_QUERY { 20001 }
 sub QUERY_CQL { 20002 }
 sub QUERY_PQF { 20003 }
 sub SORTBY { 20004 }
 sub CLONE { 20005 }
+sub PACKAGE { 20006 }
+sub SCANTERM { 20007 }
+sub LOGLEVEL { 20008 }
+
+# Separate space for CCL errors.  Great.
+package ZOOM::CCL::Error;
+sub OK { Net::Z3950::ZOOM::CCL_ERR_OK }
+sub TERM_EXPECTED { Net::Z3950::ZOOM::CCL_ERR_TERM_EXPECTED }
+sub RP_EXPECTED { Net::Z3950::ZOOM::CCL_ERR_RP_EXPECTED }
+sub SETNAME_EXPECTED { Net::Z3950::ZOOM::CCL_ERR_SETNAME_EXPECTED }
+sub OP_EXPECTED { Net::Z3950::ZOOM::CCL_ERR_OP_EXPECTED }
+sub BAD_RP { Net::Z3950::ZOOM::CCL_ERR_BAD_RP }
+sub UNKNOWN_QUAL { Net::Z3950::ZOOM::CCL_ERR_UNKNOWN_QUAL }
+sub DOUBLE_QUAL { Net::Z3950::ZOOM::CCL_ERR_DOUBLE_QUAL }
+sub EQ_EXPECTED { Net::Z3950::ZOOM::CCL_ERR_EQ_EXPECTED }
+sub BAD_RELATION { Net::Z3950::ZOOM::CCL_ERR_BAD_RELATION }
+sub TRUNC_NOT_LEFT { Net::Z3950::ZOOM::CCL_ERR_TRUNC_NOT_LEFT }
+sub TRUNC_NOT_BOTH { Net::Z3950::ZOOM::CCL_ERR_TRUNC_NOT_BOTH }
+sub TRUNC_NOT_RIGHT { Net::Z3950::ZOOM::CCL_ERR_TRUNC_NOT_RIGHT }
 
 # The "Event" package contains constants returned by last_event()
 package ZOOM::Event;
@@ -59,6 +80,7 @@ sub SEND_APDU { Net::Z3950::ZOOM::EVENT_SEND_APDU }
 sub RECV_APDU { Net::Z3950::ZOOM::EVENT_RECV_APDU }
 sub RECV_RECORD { Net::Z3950::ZOOM::EVENT_RECV_RECORD }
 sub RECV_SEARCH { Net::Z3950::ZOOM::EVENT_RECV_SEARCH }
+sub ZEND { Net::Z3950::ZOOM::EVENT_END }
 
 # ----------------------------------------------------------------------------
 
@@ -78,16 +100,38 @@ sub diag_str {
 	return "can't set sort-specification";
     } elsif ($code == ZOOM::Error::CLONE) {
 	return "can't clone record";
+    } elsif ($code == ZOOM::Error::PACKAGE) {
+	return "can't create package";
+    } elsif ($code == ZOOM::Error::SCANTERM) {
+	return "can't retrieve term from scan-set";
+    } elsif ($code == ZOOM::Error::LOGLEVEL) {
+	return "unregistered log-level";
     }
 
     return Net::Z3950::ZOOM::diag_str($code);
 }
 
-### More of the ZOOM::Exception instantiations should use this
+sub diag_srw_str {
+    my($code) = @_;
+
+    return Net::Z3950::ZOOM::diag_srw_str($code);
+}
+
+sub event_str {
+    return Net::Z3950::ZOOM::event_str(@_);
+}
+
+sub event {
+    my($connsref) = @_;
+
+    my @_connsref = map { $_->_conn() } @$connsref;
+    return Net::Z3950::ZOOM::event(\@_connsref);
+}
+
 sub _oops {
-    my($code, $addinfo) = @_;
+    my($code, $addinfo, $diagset) = @_;
 
-    die new ZOOM::Exception($code, diag_str($code), $addinfo);
+    die new ZOOM::Exception($code, undef, $addinfo, $diagset);
 }
 
 # ----------------------------------------------------------------------------
@@ -96,13 +140,23 @@ package ZOOM::Exception;
 
 sub new {
     my $class = shift();
-    my($code, $message, $addinfo) = @_;
-    ### support diag-set, too
+    my($code, $message, $addinfo, $diagset) = @_;
+
+    $diagset ||= "ZOOM";
+    if (uc($diagset) eq "ZOOM" || uc($diagset) eq "BIB-1") {
+	$message ||= ZOOM::diag_str($code);
+    } elsif (lc($diagset) eq "info:srw/diagnostic/1") {
+	$message ||= ZOOM::diag_srw_str($code);
+    } else {
+	# Should fill in messages for any other known diagsets.
+	$message ||= "(unknown error)";
+    }
 
     return bless {
 	code => $code,
 	message => $message,
 	addinfo => $addinfo,
+	diagset => $diagset,
     }, $class;
 }
 
@@ -121,6 +175,23 @@ sub addinfo {
     return $this->{addinfo};
 }
 
+sub diagset {
+    my $this = shift();
+    return $this->{diagset};
+}
+
+sub render {
+    my $this = shift();
+
+    my $res = "ZOOM error " . $this->code();
+    $res .= ' "' . $this->message() . '"' if $this->message();
+    $res .= ' (addinfo: "' . $this->addinfo() . '")' if $this->addinfo();
+    $res .= " from diag-set '" . $this->diagset() . "'" if $this->diagset();
+    return $res;
+}
+
+# This means that untrapped exceptions render nicely.
+use overload '""' => \&render;
 
 # ----------------------------------------------------------------------------
 
@@ -147,6 +218,9 @@ sub new {
     }, $class;
 }
 
+# PRIVATE to this class and ZOOM::Connection::create() and
+# ZOOM::Connection::package()
+#
 sub _opts {
     my $this = shift();
 
@@ -247,33 +321,19 @@ package ZOOM::Connection;
 
 sub new {
     my $class = shift();
-    my($host, $port) = @_;
+    my($host, $port, @options) = @_;
 
-    my $_conn = Net::Z3950::ZOOM::connection_new($host, $port);
-    my($errcode, $errmsg, $addinfo) = (undef, "dummy", "dummy");
-    $errcode = Net::Z3950::ZOOM::connection_error($_conn, $errmsg, $addinfo);
-    die new ZOOM::Exception($errcode, $errmsg, $addinfo) if $errcode;
-
-    return bless {
-	host => $host,
-	port => $port,
-	_conn => $_conn,
-    };
-}
+    my $conn = $class->create(@options);
+    $conn->{host} = $host;
+    $conn->{port} = $port;
 
-sub create {
-    my $class = shift();
-    my($options) = @_;
+    Net::Z3950::ZOOM::connection_connect($conn->_conn(), $host, $port || 0);
+    $conn->_check();
 
-    my $_conn = Net::Z3950::ZOOM::connection_create($options->_opts());
-    return bless {
-	host => undef,
-	port => undef,
-	_conn => $_conn,
-    };
+    return $conn;
 }
 
-# PRIVATE to this class
+# PRIVATE to this class, to ZOOM::event() and to ZOOM::Query::CQL2RPN::new()
 sub _conn {
     my $this = shift();
 
@@ -284,13 +344,79 @@ sub _conn {
     return $_conn;
 }
 
+sub _check {
+    my $this = shift();
+    my($always_die_on_error) = @_;
+
+    my($errcode, $errmsg, $addinfo, $diagset) = (undef, "x", "x", "x");
+    $errcode = Net::Z3950::ZOOM::connection_error_x($this->_conn(), $errmsg,
+						    $addinfo, $diagset);
+    if ($errcode) {
+	my $exception = new ZOOM::Exception($errcode, $errmsg, $addinfo,
+					    $diagset);
+	if (!$this->option("async") || $always_die_on_error) {
+	    ZOOM::Log::log("zoom_check", "throwing error $exception");
+	    die $exception;
+	} else {
+	    ZOOM::Log::log("zoom_check", "not reporting error $exception");
+	}
+    }
+}
+
+# This wrapper for _check() is called only from outside the ZOOM
+# module, and therefore only in situations where an asynchronous
+# application is actively asking for an exception to be thrown if an
+# error has been detected.  So it passed always_die_on_error=1 to the
+# underlying _check() method.
+#
+sub check {
+    my $this = shift();
+    return $this->_check(1);
+}
+
+sub create {
+    my $class = shift();
+    my(@options) = @_;
+
+    my $_opts;
+    if (@_ == 1) {
+	$_opts = $_[0]->_opts();
+    } else {
+	$_opts = Net::Z3950::ZOOM::options_create();
+	while (@options >= 2) {
+	    my $key = shift(@options);
+	    my $val = shift(@options);
+	    Net::Z3950::ZOOM::options_set($_opts, $key, $val);
+	}
+
+	die "Odd number of options specified"
+	    if @options;
+    }
+
+    my $_conn = Net::Z3950::ZOOM::connection_create($_opts);
+    my $conn = bless {
+	host => undef,
+	port => undef,
+	_conn => $_conn,
+    }, $class;
+    return $conn;
+}
+
 sub error_x {
     my $this = shift();
 
     my($errcode, $errmsg, $addinfo, $diagset) = (undef, "dummy", "dummy", "d");
     $errcode = Net::Z3950::ZOOM::connection_error_x($this->_conn(), $errmsg,
 						    $addinfo, $diagset);
-    return ($errcode, $errmsg, $addinfo, $diagset);
+    return wantarray() ? ($errcode, $errmsg, $addinfo, $diagset) : $errcode;
+}
+
+sub exception {
+    my $this = shift();
+
+    my($errcode, $errmsg, $addinfo, $diagset) = $this->error_x();
+    return undef if $errcode == 0;
+    return new ZOOM::Exception($errcode, $errmsg, $addinfo, $diagset);
 }
 
 sub errcode {
@@ -308,15 +434,18 @@ sub addinfo {
     return Net::Z3950::ZOOM::connection_addinfo($this->_conn());
 }
 
+sub diagset {
+    my $this = shift();
+    return Net::Z3950::ZOOM::connection_diagset($this->_conn());
+}
+
 sub connect {
     my $this = shift();
     my($host, $port) = @_;
 
+    $port = 0 if !defined $port;
     Net::Z3950::ZOOM::connection_connect($this->_conn(), $host, $port);
-    my($errcode, $errmsg, $addinfo) = (undef, "dummy", "dummy");
-    $errcode = Net::Z3950::ZOOM::connection_error($this->_conn(),
-						  $errmsg, $addinfo);
-    die new ZOOM::Exception($errcode, $errmsg, $addinfo) if $errcode;
+    $this->_check();
     # No return value
 }
 
@@ -351,11 +480,7 @@ sub search {
 
     my $_rs = Net::Z3950::ZOOM::connection_search($this->_conn(),
 						  $query->_query());
-    my($errcode, $errmsg, $addinfo) = (undef, "dummy", "dummy");
-    $errcode = Net::Z3950::ZOOM::connection_error($this->_conn(),
-						  $errmsg, $addinfo);
-    die new ZOOM::Exception($errcode, $errmsg, $addinfo) if $errcode;
-
+    $this->_check();
     return _new ZOOM::ResultSet($this, $query, $_rs);
 }
 
@@ -364,27 +489,59 @@ sub search_pqf {
     my($pqf) = @_;
 
     my $_rs = Net::Z3950::ZOOM::connection_search_pqf($this->_conn(), $pqf);
-    my($errcode, $errmsg, $addinfo) = (undef, "dummy", "dummy");
-    $errcode = Net::Z3950::ZOOM::connection_error($this->_conn(),
-						  $errmsg, $addinfo);
-    die new ZOOM::Exception($errcode, $errmsg, $addinfo) if $errcode;
-
+    $this->_check();
     return _new ZOOM::ResultSet($this, $pqf, $_rs);
 }
 
-sub scan {
+sub scan_pqf {
     my $this = shift();
     my($startterm) = @_;
 
     my $_ss = Net::Z3950::ZOOM::connection_scan($this->_conn(), $startterm);
-    my($errcode, $errmsg, $addinfo) = (undef, "dummy", "dummy");
-    $errcode = Net::Z3950::ZOOM::connection_error($this->_conn(),
-						  $errmsg, $addinfo);
-    die new ZOOM::Exception($errcode, $errmsg, $addinfo) if $errcode;
-
+    $this->_check();
     return _new ZOOM::ScanSet($this, $startterm, $_ss);
 }
 
+sub scan {
+    my $this = shift();
+    my($query) = @_;
+
+    my $_ss = Net::Z3950::ZOOM::connection_scan1($this->_conn(),
+						 $query->_query());
+    $this->_check();
+    return _new ZOOM::ScanSet($this, $query, $_ss);
+}
+
+sub package {
+    my $this = shift();
+    my($options) = @_;
+
+    my $_o = defined $options ? $options->_opts() :
+	Net::Z3950::ZOOM::options_create();
+    my $_p = Net::Z3950::ZOOM::connection_package($this->_conn(), $_o)
+	or ZOOM::_oops(ZOOM::Error::PACKAGE);
+
+    return _new ZOOM::Package($this, $options, $_p);
+}
+
+sub last_event {
+    my $this = shift();
+
+    return Net::Z3950::ZOOM::connection_last_event($this->_conn());
+}
+
+sub is_idle {
+    my $this = shift();
+
+    return Net::Z3950::ZOOM::connection_is_idle($this->_conn());
+}
+
+sub peek_event {
+    my $this = shift();
+
+    return Net::Z3950::ZOOM::connection_peek_event($this->_conn());
+}
+
 sub destroy {
     my $this = shift();
 
@@ -421,6 +578,14 @@ sub sortby {
 	or ZOOM::_oops(ZOOM::Error::SORTBY, $sortby);
 }
 
+sub sortby2 {
+    my $this = shift();
+    my($strategy, $sortby) = @_;
+
+    Net::Z3950::ZOOM::query_sortby2($this->_query(), $strategy, $sortby) == 0
+	or ZOOM::_oops(ZOOM::Error::SORTBY, $sortby);
+}
+
 sub destroy {
     my $this = shift();
 
@@ -447,6 +612,62 @@ sub new {
 }
 
 
+package ZOOM::Query::CQL2RPN;
+our @ISA = qw(ZOOM::Query);
+
+sub new {
+    my $class = shift();
+    my($string, $conn) = @_;
+
+    my $q = Net::Z3950::ZOOM::query_create()
+	or ZOOM::_oops(ZOOM::Error::CREATE_QUERY);
+    # check() throws the exception we want; but we only want it on failure!
+    Net::Z3950::ZOOM::query_cql2rpn($q, $string, $conn->_conn()) == 0
+	or $conn->_check();
+
+    return bless {
+	_query => $q,
+    }, $class;
+}
+
+
+# We have to work around the retarded ZOOM_query_ccl2rpn() API
+package ZOOM::Query::CCL2RPN;
+our @ISA = qw(ZOOM::Query);
+
+sub new {
+    my $class = shift();
+    my($string, $conn) = @_;
+
+    my $q = Net::Z3950::ZOOM::query_create()
+	or ZOOM::_oops(ZOOM::Error::CREATE_QUERY);
+
+    my $config = $conn->option("cclqual");
+    if (!defined $config) {
+	my $cclfile = $conn->option("cclfile")
+	    or ZOOM::_oops(ZOOM::Error::CCL_CONFIG,
+			   "no 'cclqual' or 'cclfile' specified");
+	my $fh = new IO::File("<$cclfile")
+	    or ZOOM::_oops(ZOOM::Error::CCL_CONFIG,
+			   "can't open cclfile '$cclfile': $!");
+	$config = join("", <$fh>);
+	$fh->close();
+    }
+
+    my($ccl_errcode, $ccl_errstr, $ccl_errpos) = (0, "", 0);
+    if (Net::Z3950::ZOOM::query_ccl2rpn($q, $string, $config,
+					$ccl_errcode, $ccl_errstr,
+					$ccl_errpos) < 0) {
+	# We have no use for $ccl_errcode or $ccl_errpos
+	ZOOM::_oops(ZOOM::Error::CCL_PARSE, $ccl_errstr);
+    }
+
+    return bless {
+	_query => $q,
+    }, $class;
+}
+
+
 package ZOOM::Query::PQF;
 our @ISA = qw(ZOOM::Query);
 
@@ -524,7 +745,12 @@ sub record {
     my($which) = @_;
 
     my $_rec = Net::Z3950::ZOOM::resultset_record($this->_rs(), $which);
-    ### Check for error -- but how?
+    $this->{conn}->_check();
+
+    # Even if no error has occurred, I think record() might
+    # legitimately return undef if we're running in asynchronous mode
+    # and the record just hasn't been retrieved yet.  This goes double
+    # for record_immediate().
     return undef if !defined $_rec;
 
     # For some reason, I have to use the explicit "->" syntax in order
@@ -539,7 +765,8 @@ sub record_immediate {
 
     my $_rec = Net::Z3950::ZOOM::resultset_record_immediate($this->_rs(),
 							    $which);
-    ### Check for error -- but how?
+    $this->{conn}->_check();
+    # The record might legitimately not be there yet
     return undef if !defined $_rec;
 
     return ZOOM::Record->_new($this, $which, $_rec);
@@ -555,8 +782,25 @@ sub records {
     my $this = shift();
     my($start, $count, $return_records) = @_;
 
+    # If the request is out of range, ZOOM-C will currently (as of YAZ
+    # 2.1.38) no-op: it understandably refuses to build and send a
+    # known-bad APDU, but it doesn't set a diagnostic as it ought.  So
+    # for now, we do it here.  It would be more polite to stash the
+    # error-code in the ZOOM-C connection object for subsequent
+    # discovery (which is what ZOOM-C will presumably do itself when
+    # it's fixed) but since there is no API that allows us to do that,
+    # we just have to throw the exception right now.  That's probably
+    # OK for synchronous applications, but not really for
+    # multiplexers.
+    my $size = $this->size();
+    if ($start + $count-1 >= $size) {
+	# BIB-1 diagnostic 13 is "Present request out-of-range"
+	ZOOM::_oops(13, undef, "BIB-1");
+    }
+
     my $raw = Net::Z3950::ZOOM::resultset_records($this->_rs(), $start, $count,
 						  $return_records);
+    # By design, $raw may be undefined (if $return_records is true)
     return undef if !defined $raw;
 
     # We need to package up the returned records in ZOOM::Record objects
@@ -577,8 +821,8 @@ sub sort {
     my $this = shift();
     my($sort_type, $sort_spec) = @_;
 
-    Net::Z3950::ZOOM::resultset_sort($this->_rs(), $sort_type, $sort_spec);
-    ### There's no way to check for success, as this is a void function
+    return Net::Z3950::ZOOM::resultset_sort1($this->_rs(),
+					     $sort_type, $sort_spec);
 }
 
 sub destroy {
@@ -624,26 +868,43 @@ sub _rec {
     return $_rec;
 }
 
+sub error {
+    my $this = shift();
+
+    my($errcode, $errmsg, $addinfo, $diagset) = (undef, "dummy", "dummy", "d");
+    $errcode = Net::Z3950::ZOOM::record_error($this->_rec(), $errmsg,
+					      $addinfo, $diagset);
+
+    return wantarray() ? ($errcode, $errmsg, $addinfo, $diagset) : $errcode;
+}
+
+sub exception {
+    my $this = shift();
+
+    my($errcode, $errmsg, $addinfo, $diagset) = $this->error();
+    return undef if $errcode == 0;
+    return new ZOOM::Exception($errcode, $errmsg, $addinfo, $diagset);
+}
+
+
 sub render {
     my $this = shift();
 
-    my $len = 0;
-    my $string = Net::Z3950::ZOOM::record_get($this->_rec(), "render", $len);
-    # I don't think we need '$len' at all.  ### Probably the Perl-to-C
-    # glue code should use the value of `len' as well as the opaque
-    # data-pointer returned, to ensure that the SV contains all of the
-    # returned data and does not stop at the first NUL character in
-    # binary data.  Carefully check the ZOOM_record_get() documentation.
-    return $string;
+    return $this->get("render", @_);
 }
 
 sub raw {
     my $this = shift();
 
-    my $len = 0;
-    my $string = Net::Z3950::ZOOM::record_get($this->_rec(), "raw", $len);
-    # See comment about $len in render()
-    return $string;
+    return $this->get("raw", @_);
+}
+
+sub get {
+    my $this = shift();
+    my($type, $args) = @_;
+
+    $type = "$type;$args" if defined $args;
+    return Net::Z3950::ZOOM::record_get($this->_rec(), $type);
 }
 
 sub clone {
@@ -680,7 +941,12 @@ sub _new {
 
     return bless {
 	conn => $conn,
-	startterm => $startterm,
+	startterm => $startterm,# This is not currently used, which is
+				# just as well since it could be
+				# either a string (when the SS is
+				# created with scan()) or a
+				# ZOOM::Query object (when it's
+				# created with scan1())
 	_ss => $_ss,
     }, $class;
 }
@@ -696,6 +962,17 @@ sub _ss {
     return $_ss;
 }
 
+sub option {
+    my $this = shift();
+    my($key, $value) = @_;
+
+    my $oldval = Net::Z3950::ZOOM::scanset_option_get($this->_ss(), $key);
+    Net::Z3950::ZOOM::scanset_option_set($this->_ss(), $key, $value)
+	if defined $value;
+
+    return $oldval;
+}
+
 sub size {
     my $this = shift();
 
@@ -708,8 +985,9 @@ sub term {
 
     my($occ, $len) = (0, 0);
     my $term = Net::Z3950::ZOOM::scanset_term($this->_ss(), $which,
-					      $occ, $len);
-    return undef if !defined $term;
+					      $occ, $len)
+	or ZOOM::_oops(ZOOM::Error::SCANTERM);
+
     die "length of term '$term' differs from returned len=$len"
 	if length($term) != $len;
 
@@ -722,8 +1000,9 @@ sub display_term {
 
     my($occ, $len) = (0, 0);
     my $term = Net::Z3950::ZOOM::scanset_display_term($this->_ss(), $which,
-						      $occ, $len);
-    return undef if !defined $term;
+						      $occ, $len)
+	or ZOOM::_oops(ZOOM::Error::SCANTERM);
+
     die "length of display term '$term' differs from returned len=$len"
 	if length($term) != $len;
 
@@ -738,4 +1017,101 @@ sub destroy {
 }
 
 
+# ----------------------------------------------------------------------------
+
+package ZOOM::Package;
+
+sub new {
+    my $class = shift();
+    die "You can't create $class objects directly";
+}
+
+# PRIVATE to ZOOM::Connection::package(),
+sub _new {
+    my $class = shift();
+    my($conn, $options, $_p) = @_;
+
+    return bless {
+	conn => $conn,
+	options => $options,
+	_p => $_p,
+    }, $class;
+}
+
+# PRIVATE to this class
+sub _p {
+    my $this = shift();
+
+    my $_p = $this->{_p};
+    die "{_p} undefined: has this Package been destroy()ed?"
+	if !defined $_p;
+
+    return $_p;
+}
+
+sub option {
+    my $this = shift();
+    my($key, $value) = @_;
+
+    my $oldval = Net::Z3950::ZOOM::package_option_get($this->_p(), $key);
+    Net::Z3950::ZOOM::package_option_set($this->_p(), $key, $value)
+	if defined $value;
+
+    return $oldval;
+}
+
+sub send {
+    my $this = shift();
+    my($type) = @_;
+
+    Net::Z3950::ZOOM::package_send($this->_p(), $type);
+    $this->{conn}->_check();
+}
+
+sub destroy {
+    my $this = shift();
+
+    Net::Z3950::ZOOM::package_destroy($this->_p());
+    $this->{_p} = undef;
+}
+
+
+# There follows trivial support for YAZ logging.  This is wired out
+# into the Net::Z3950::ZOOM package, and we here provide wrapper
+# functions -- nothing more than aliases, really -- in the ZOOM::Log
+# package.  There really is no point in inventing an OO interface.
+#
+# Passing @_ directly to the underlying Net::Z3950::ZOOM::* functions
+# doesn't work, for reasons that I can't begin to fathom, and that
+# don't particularly interest me.  Unpacking into scalars and passing
+# those _does_ work, so that's what we do.
+
+package ZOOM::Log;
+
+sub mask_str      { my($a) = @_; Net::Z3950::ZOOM::yaz_log_mask_str($a); }
+sub module_level  { my($a) = @_; Net::Z3950::ZOOM::yaz_log_module_level($a); }
+sub init          { my($a, $b, $c) = @_;
+		    Net::Z3950::ZOOM::yaz_log_init($a, $b, $c) }
+sub init_file     { my($a) = @_; Net::Z3950::ZOOM::yaz_log_init_file($a) }
+sub init_level    { my($a) = @_; Net::Z3950::ZOOM::yaz_log_init_level($a) }
+sub init_prefix   { my($a) = @_; Net::Z3950::ZOOM::yaz_log_init_prefix($a) }
+sub time_format   { my($a) = @_; Net::Z3950::ZOOM::yaz_log_time_format($a) }
+sub init_max_size { my($a) = @_; Net::Z3950::ZOOM::yaz_log_init_max_size($a) }
+
+sub log {
+    my($level, @message) = @_;
+
+    if ($level !~ /^(0x)?\d+$/) {
+	# Assuming its log-level name, we look it up.
+	my $num = module_level($level);
+	ZOOM::_oops(ZOOM::Error::LOGLEVEL, $level)
+	    if $num == 0;
+	$level = $num;
+    }
+
+    Net::Z3950::ZOOM::yaz_log($level, join("", @message));
+}
+
+BEGIN { ZOOM::Log::mask_str("zoom_check"); }
+
 1;