1Net::LDAP::Control::VLVU(s3e)r Contributed Perl DocumentaNteito:n:LDAP::Control::VLV(3)
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NAME

6       Net::LDAP::Control::VLV - LDAPv3 Virtual List View control object
7

SYNOPSIS

9        use Net::LDAP;
10        use Net::LDAP::Control::VLV;
11        use Net::LDAP::Constant qw( LDAP_CONTROL_VLVRESPONSE );
12
13        $ldap = Net::LDAP->new( "ldap.mydomain.eg" );
14
15        # Get the first 20 entries
16        $vlv  = Net::LDAP::Control::VLV->new(
17                  before  => 0,        # No entries from before target entry
18                  after   => 19,       # 19 entries after target entry
19                  content => 0,        # List size unknown
20                  offset  => 1,        # Target entry is the first
21                );
22        $sort = Net::LDAP::Control::Sort->new( order => 'cn' );
23
24        @args = ( base     => "o=Ace Industry, c=us",
25                  scope    => "subtree",
26                  filter   => "(objectClass=inetOrgPerson)",
27                  callback => \&process_entry, # Call this sub for each entry
28                  control  => [ $vlv, $sort ],
29        );
30
31        $mesg = $ldap->search( @args );
32
33        # Get VLV response control
34        ($resp)  = $mesg->control( LDAP_CONTROL_VLVRESPONSE ) or die;
35        $vlv->response( $resp );
36
37        # Set the control to get the last 20 entries
38        $vlv->end;
39
40        $mesg = $ldap->search( @args );
41
42        # Get VLV response control
43        ($resp)  = $mesg->control( LDAP_CONTROL_VLVRESPONSE ) or die;
44        $vlv->response( $resp );
45
46        # Now get the previous page
47        $vlv->scroll_page( -1 );
48
49        $mesg = $ldap->search( @args );
50
51        # Get VLV response control
52        ($resp)  = $mesg->control( LDAP_CONTROL_VLVRESPONSE ) or die;
53        $vlv->response( $resp );
54
55        # Now page with first entry starting with "B" in the middle
56        $vlv->before(9);       # Change page to show 9 before
57        $vlv->after(10);       # Change page to show 10 after
58        $vlv->assert("B");     # assert "B"
59
60        $mesg = $ldap->search( @args );
61

DESCRIPTION

63       "Net::LDAP::Control::VLV" provides an interface for the creation and
64       manipulation of objects that represent the Virtual List View as
65       described by draft-ietf-ldapext-ldapv3-vlv-03.txt.
66
67       When using a Virtual List View control in a search, it must be
68       accompanied by a sort control. See Net::LDAP::Control::Sort
69

CONSTRUCTOR ARGUMENTS

71       In addition to the constructor arguments described in
72       Net::LDAP::Control the following are provided.
73
74       after
75           Set the number of entries the server should return from the list
76           after the target entry.
77
78       assert
79           Set the assertion value user to locate the target entry. This value
80           should be a legal value to compare with the first attribute in the
81           sort control that is passed with the VLV control. The target entry
82           is the first entry in the list which is greater than or equal the
83           assert value.
84
85       before
86           Set the number of entries the server should return from the list
87           before the target entry.
88
89       content
90           Set the number of entries in the list. On the first search this
91           value should be set to zero. On subsequent searches it should be
92           set to the length of the list, as returned by the server in the
93           VLVResponse control.
94
95       context
96           Set the context identifier.  On the first search this value should
97           be set to zero. On subsequent searches it should be set to the
98           context value returned by the server in the VLVResponse control.
99
100       offset
101           Set the offset of the target entry.
102
103   METHODS
104       As with Net::LDAP::Control each constructor argument described above is
105       also avaliable as a method on the object which will return the current
106       value for the attribute if called without an argument, and set a new
107       value for the attribute if called with an argument.
108
109       The "offset" and "assert" attributes are mutually exclusive. Setting
110       one or the other will cause previous values set by the other to be
111       forgotten. The "content" attribute is also associated with the "offset"
112       attribute, so setting "assert" will cause any "content" value to be
113       forgotten.
114
115       end Set the target entry to the end of the list. This method will
116           change the "before" and "after" attributes so that the target entry
117           is the last in the page.
118
119       response VLV_RESPONSE
120           Set the attributes in the control as per VLV_RESPONSE. VLV_RESPONSE
121           should be a control of type Net::LDAP::Control::VLVResponse
122           returned from the server. "response" will populate the "context",
123           "offset" and "content" attibutes of the control with the values
124           from VLV_RESPONSE. Because this sets the "offset" attribute, any
125           previous setting of the "assert" attribute will be forgotten.
126
127       scroll NUM
128           Move the target entry by NUM entries. A positive NUM will move the
129           target entry towards the end of the list and a negative NUM will
130           move the target entry towards the start of the list. Returns the
131           index of the new target entry, or "undef" if the current target is
132           identified by an assertion.
133
134           "scroll" may change the "before" and "after" attributes if the
135           scroll value would cause the page to go off either end of the list.
136           But the page size will be maintained.
137
138       scroll_page NUM
139           Scroll by NUM pages. This method simple calculates the current page
140           size and calls "scroll" with "NUM * $page_size"
141
142       start
143           Set the target entry to the start of the list. This method will
144           change the "before" and "after" attributes to the the target entry
145           is the first entry in the page.
146

SEE ALSO

148       Net::LDAP, Net::LDAP::Control, Net::LDAP::Control::Sort,
149       Net::LDAP::Control::VLVResponse
150

AUTHOR

152       Graham Barr <gbarr@pobox.com>
153
154       Please report any bugs, or post any suggestions, to the perl-ldap
155       mailing list <perl-ldap@perl.org>
156
158       Copyright (c) 2000-2004 Graham Barr. All rights reserved. This program
159       is free software; you can redistribute it and/or modify it under the
160       same terms as Perl itself.
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164perl v5.12.0                      2010-03-12        Net::LDAP::Control::VLV(3)
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