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package Ekahau; |
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use base 'Ekahau::Base'; our $VERSION = $Ekahau::Base::VERSION; |
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# Written by Scott Gifford |
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# Copyright (C) 2004 The Regents of the University of Michigan. |
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# See the file LICENSE included with the distribution for license |
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# information. |
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use warnings; |
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use strict; |
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=head1 NAME |
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Ekahau - Synchronous interface to Ekahau location sensing system |
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=head1 SYNOPSIS |
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The C class provides a straightforward synchronous interface |
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to the Ekahau location sensing system's YAX protocol. The YAX |
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protocol itself is asynchronous, so this module tries its best to hide |
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that from you. |
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This class inherits from L, and you can use methods from |
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that class. An alternative, event-driven interface is provided by |
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L. |
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=head1 DESCRIPTION |
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This class implements methods for querying the Ekahau Positioning |
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Engine, and processing the responses. Each C object |
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represents a connection to the Ekahau server. Some methods send |
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queries to the server, others receive responses, and still others do |
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both. This class tries to hide the asynchronousness of the YAX |
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protocol from you. |
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The basic mechanism allows you to send requests, and wait for |
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responses. If other responses unrelated to the one you're waiting for |
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come in, they will be queued and sent to you when you ask for them. |
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Some methods will first send a request then wait for the response, |
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handling all of the details internally. |
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=head2 Constructor |
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This classes uses L as its constructor. |
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=head2 Methods |
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=head3 getresponse ( [ $tags ], [ $cmds ] ) |
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Get the next L matching the given tags and commands. |
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If you specify neither tags nor commands, the next response will be |
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returned. If you specify just one of the two, responses will only be |
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matched against the one specified. If you specify both, responses |
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must match one of the tags, and one of the commands. |
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Both C<$tags> and C<$cmds> should be list references. |
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Examples: |
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$obj->getresponse(); # Next response |
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$obj->getresponse(['LOC','AREA']); # Next response with LOC or AREA tag |
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$obj->getresponse([],['DEVICE_LIST']); # Next DEVICE_LIST response |
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=cut |
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sub getresponse |
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{ |
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my $self = shift; |
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my ($tags,$cmds)=@_; |
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my $tagmap = (($tags and @$tags) ? { map { $_ => 1 } @$tags } : undef); |
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my $cmdmap = (($cmds and @$cmds) ? { map { $_ => 1 } @$cmds } : undef); |
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# See if we have something on the queue already |
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if ($self->{_q}) |
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{ |
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foreach my $i (0..$#{$self->{_q}}) |
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{ |
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if (_respmatch($self->{_q}[$i],$tagmap,$cmdmap)) |
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{ |
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return splice(@{$self->{_q}},$i,1); |
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} |
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} |
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} |
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# Wait until we get something, or the timeout expires. |
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my $started = time; |
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while(1) |
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{ |
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while (my $resp = $self->getpending) |
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{ |
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return $resp if (_respmatch($resp,$tagmap,$cmdmap)); |
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push @{$self->{_q}},$resp; |
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} |
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# See if we timed out. |
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$self->can_read($self->{_timeout}?($self->{_timeout}-(time-$started)):0) |
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or return undef; |
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$self->readsome() |
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or return undef; |
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} |
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} |
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=head3 gettaggedresponse ( @tags ) |
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Get the next L matching any of the given tags. This |
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is exactly equivalent to: |
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$self->getresponse([@_]); |
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=cut |
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113
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sub gettaggedresponse |
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{ |
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my $self = shift; |
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$self->getresponse([@_]); |
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} |
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sub _respmatch |
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{ |
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my($resp,$tagmap,$cmdmap) = @_; |
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return ((!$tagmap and !$cmdmap) |
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or (!$cmdmap and $resp->{tag} and $tagmap->{$resp->{tag}}) |
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or (!$tagmap and $resp->{cmd} and $cmdmap->{$resp->{cmd}}) |
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or ($resp->{cmd} and $resp->{tag} and $tagmap->{$resp->{tag}} and $cmdmap->{$resp->{cmd}})); |
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} |
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=head3 get_device_list ( ) |
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Get a list of devices currently detected on the Ekahau system. The |
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response is returned as a reference to a list of numeric IDs. On |
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error, this method will return C. |
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=cut |
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sub get_device_list |
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{ |
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my $self = shift; |
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my $tag = $self->request_device_list |
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or return undef; |
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my $resp = $self->gettaggedresponse($tag) |
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or return undef; |
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if ($resp->error) |
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{ |
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return $self->reterr("GET_DEVICE_LIST failed: ".$resp->error_description); |
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} |
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elsif ($resp->type ne 'DeviceList') |
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{ |
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return $self->reterr("GET_DEVICE_LIST failed: unexpected response!"); |
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} |
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return [$resp->devices]; |
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} |
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=head3 get_device_properties ( $device_id ) |
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160
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Get the properties for the device with the given ID. Returns an |
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L object. |
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163
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=cut |
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165
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sub get_device_properties |
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{ |
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my $self = shift; |
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my $tag = $self->request_device_properties(@_) |
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or return undef; |
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my $resp = $self->gettaggedresponse($tag) |
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or return undef; |
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if ($resp->error) |
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{ |
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return $self->reterr("GET_DEVICE_PROPERTIES failed: ".$resp->error_description); |
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} |
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elsif ($resp->type ne 'DeviceProperties') |
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{ |
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return $self->reterr("GET_DEVICE_PROPERTIES failed: unexpected response of type ".$resp->type."!"); |
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} |
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$resp; |
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} |
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=head3 get_location_context ( $area_id ) |
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Get the properties of the area with the given ID. Returns an |
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L object. |
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191
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=cut |
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sub get_location_context |
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{ |
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my $self = shift; |
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my $tag = $self->request_location_context(@_) |
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or return undef; |
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my $resp = $self->gettaggedresponse($tag) |
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or return undef; |
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if ($resp->error) |
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{ |
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$self->{err} = "GET_CONTEXT failed: ".$resp->error_description; |
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return undef; |
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} |
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elsif ($resp->type ne 'LocationContext') |
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{ |
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$self->{err} = "GET_CONTEXT failed: unexpected response!"; |
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return undef; |
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} |
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$resp; |
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} |
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216
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=head3 get_map_image ( $area_id ) |
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Get a map of the area with the given ID. Returns an |
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L object. |
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221
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=cut |
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sub get_map_image |
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{ |
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my $self = shift; |
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my $tag = $self->request_map_image(@_) |
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or return undef; |
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my $resp = $self->gettaggedresponse($tag) |
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or return undef; |
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232
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if ($resp->error) |
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{ |
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return $self->reterr("GET_MAP failed: ".$resp->error_description); |
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} |
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elsif ($resp->type ne 'MapImage') |
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{ |
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return $self->reterr("GET_MAP failed: unexpected response!"); |
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} |
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241
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$resp; |
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} |
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=head3 get_all_areas ( ) |
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Returns a list of all logical areas, as an |
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L object. |
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=cut |
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sub get_all_areas |
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{ |
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my $self = shift; |
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my $tag = $self->request_all_areas(@_) |
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or return undef; |
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my $resp = $self->gettaggedresponse($tag) |
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or return undef; |
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if ($resp->error) |
261
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{ |
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return $self->reterr("GET_LOGICAL_AREAS failed: ".$resp->error_description); |
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} |
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elsif ($resp->type ne 'AreaList') |
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{ |
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return $self->reterr("GET_LOGICAL_AREAS failed: unexpected response!"); |
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} |
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$resp; |
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} |
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=head3 start_location_track ( [ $properties ], $device) |
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Start a continuous query tracking the location of the given device. |
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An optional hash reference containing properties for the query can be |
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given; see L for details. |
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You can get results with L or L. |
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=cut |
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283
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sub start_location_track |
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{ |
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my $self = shift; |
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my %p = ref $_[0] ? %{ (shift) } : (); |
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$p{Tag} = 'LOC'; |
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$self->SUPER::start_location_track(\%p,@_); |
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} |
290
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291
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=head3 stop_location_track ($device) |
292
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293
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Stop a continuous query tracking the location of the given device. |
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=cut |
296
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297
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sub stop_location_track |
298
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{ |
299
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my $self = shift; |
300
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301
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my $tag = $self->request_stop_location_track(@_) |
302
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or return undef; |
303
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my $resp = $self->gettaggedresponse($tag) |
304
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or return undef; |
305
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306
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if ($resp->error) |
307
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{ |
308
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return $self->reterr("STOP_LOCATION_TRACK failed: ".$resp->error_description); |
309
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} |
310
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elsif ($resp->type ne 'StopLocationTrackOK') |
311
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{ |
312
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return $self->reterr("STOP_LOCATION_TRACK failed: unexpected response '".$resp->type."!"); |
313
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} |
314
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315
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$resp; |
316
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} |
317
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318
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319
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=head3 next_location ( ) |
320
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321
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Return the next location for any of the continuous queries started by |
322
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calls to L. The returned value will be an |
323
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L object, or C on error. |
324
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325
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=cut |
326
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327
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sub next_location |
328
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{ |
329
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my $self = shift; |
330
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331
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my $r = $self->gettaggedresponse('LOC') |
332
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|
or return undef; |
333
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334
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|
if ($r->{cmd} ne 'LOCATION_ESTIMATE') |
335
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|
{ |
336
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|
return $self->reterr("LOCATION_ESTIMATE failed: $r->{cmd} @{$r->{args}}"); |
337
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} |
338
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|
return $r; |
339
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} |
340
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341
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|
=head3 start_area_track ( [ $properties ], $device_id ) |
342
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343
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|
Start a continuous query tracking the area where the given device is |
344
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|
located. An optional hash reference containing properties for the |
345
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|
query can be given; see L for details. |
346
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|
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|
347
|
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|
|
You can get results with L or L. |
348
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|
349
|
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|
|
=cut |
350
|
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351
|
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|
|
sub start_area_track |
352
|
|
|
|
|
|
|
{ |
353
|
|
|
|
|
|
|
my $self = shift; |
354
|
|
|
|
|
|
|
my %p = ref $_[0] ? %{ (shift) } : (); |
355
|
|
|
|
|
|
|
$p{Tag} = 'AREA'; |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
$self->SUPER::start_area_track(\%p,@_); |
358
|
|
|
|
|
|
|
} |
359
|
|
|
|
|
|
|
|
360
|
|
|
|
|
|
|
=head3 stop_area_track ($device) |
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
Stop a continuous query tracking the area of the given device. |
363
|
|
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|
|
|
|
|
364
|
|
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|
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|
|
=cut |
365
|
|
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|
|
|
366
|
|
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|
|
|
|
sub stop_area_track |
367
|
|
|
|
|
|
|
{ |
368
|
|
|
|
|
|
|
my $self = shift; |
369
|
|
|
|
|
|
|
|
370
|
|
|
|
|
|
|
my $tag = $self->request_stop_area_track(@_) |
371
|
|
|
|
|
|
|
or return undef; |
372
|
|
|
|
|
|
|
my $resp = $self->gettaggedresponse($tag) |
373
|
|
|
|
|
|
|
or return undef; |
374
|
|
|
|
|
|
|
|
375
|
|
|
|
|
|
|
if ($resp->error) |
376
|
|
|
|
|
|
|
{ |
377
|
|
|
|
|
|
|
return $self->reterr("STOP_AREA_TRACK failed: ".$resp->error_description); |
378
|
|
|
|
|
|
|
} |
379
|
|
|
|
|
|
|
elsif ($resp->type ne 'StopAreaTrackOK') |
380
|
|
|
|
|
|
|
{ |
381
|
|
|
|
|
|
|
return $self->reterr("STOP_AREA_TRACK failed: unexpected response '".$resp->type."'!"); |
382
|
|
|
|
|
|
|
} |
383
|
|
|
|
|
|
|
|
384
|
|
|
|
|
|
|
$resp; |
385
|
|
|
|
|
|
|
} |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
|
388
|
|
|
|
|
|
|
=head3 next_area ( ) |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
|
|
|
Return the next area for any of the continuous queries started by |
391
|
|
|
|
|
|
|
calls to L. The returned value will be an |
392
|
|
|
|
|
|
|
L object, or C on error. |
393
|
|
|
|
|
|
|
|
394
|
|
|
|
|
|
|
=cut |
395
|
|
|
|
|
|
|
|
396
|
|
|
|
|
|
|
sub next_area |
397
|
|
|
|
|
|
|
{ |
398
|
|
|
|
|
|
|
my $self = shift; |
399
|
|
|
|
|
|
|
my $r = $self->gettaggedresponse('AREA'); |
400
|
|
|
|
|
|
|
|
401
|
|
|
|
|
|
|
if ($r->{cmd} ne 'AREA_ESTIMATE') |
402
|
|
|
|
|
|
|
{ |
403
|
|
|
|
|
|
|
return $self->reterr("AREA_ESTIMATE failed: $r->{cmd} @{$r->{args}}"); |
404
|
|
|
|
|
|
|
} |
405
|
|
|
|
|
|
|
return $r; |
406
|
|
|
|
|
|
|
} |
407
|
|
|
|
|
|
|
|
408
|
|
|
|
|
|
|
=head3 start_track ( [ $properties ], $device_id ) |
409
|
|
|
|
|
|
|
|
410
|
|
|
|
|
|
|
Start tracking both the location and the area of the given device, by |
411
|
|
|
|
|
|
|
calling the L and L methods. |
412
|
|
|
|
|
|
|
|
413
|
|
|
|
|
|
|
An optional hash reference containing properties for the query can be |
414
|
|
|
|
|
|
|
given. These properties will be passed on to both queries; if you |
415
|
|
|
|
|
|
|
need different properties for the two queries call the methods |
416
|
|
|
|
|
|
|
directly. |
417
|
|
|
|
|
|
|
|
418
|
|
|
|
|
|
|
Results can be obtained by calling the L method. |
419
|
|
|
|
|
|
|
|
420
|
|
|
|
|
|
|
=cut |
421
|
|
|
|
|
|
|
|
422
|
|
|
|
|
|
|
sub start_track |
423
|
|
|
|
|
|
|
{ |
424
|
|
|
|
|
|
|
my $self = shift; |
425
|
|
|
|
|
|
|
|
426
|
|
|
|
|
|
|
# Use temp variables so we can return the correct result, |
427
|
|
|
|
|
|
|
# but still make sure we start both. |
428
|
|
|
|
|
|
|
my $e1 = $self->start_location_track(@_); |
429
|
|
|
|
|
|
|
my $e2 = $self->start_area_track(@_); |
430
|
|
|
|
|
|
|
|
431
|
|
|
|
|
|
|
return $e1 and $e2; |
432
|
|
|
|
|
|
|
} |
433
|
|
|
|
|
|
|
|
434
|
|
|
|
|
|
|
=head3 stop_track ( $device_id ) |
435
|
|
|
|
|
|
|
|
436
|
|
|
|
|
|
|
Stop tracking both the location and the area of the given device, by |
437
|
|
|
|
|
|
|
calling the L and L methods. |
438
|
|
|
|
|
|
|
|
439
|
|
|
|
|
|
|
=cut |
440
|
|
|
|
|
|
|
|
441
|
|
|
|
|
|
|
sub stop_track |
442
|
|
|
|
|
|
|
{ |
443
|
|
|
|
|
|
|
my $self = shift; |
444
|
|
|
|
|
|
|
|
445
|
|
|
|
|
|
|
# Use temp variables so we can return the correct result, |
446
|
|
|
|
|
|
|
# but still make sure we start both. |
447
|
|
|
|
|
|
|
my $e1 = $self->stop_location_track(@_); |
448
|
|
|
|
|
|
|
my $e2 = $self->stop_area_track(@_); |
449
|
|
|
|
|
|
|
|
450
|
|
|
|
|
|
|
return $e1 and $e2; |
451
|
|
|
|
|
|
|
} |
452
|
|
|
|
|
|
|
|
453
|
|
|
|
|
|
|
|
454
|
|
|
|
|
|
|
=head3 next_track ( ) |
455
|
|
|
|
|
|
|
|
456
|
|
|
|
|
|
|
Return the next location or area for any of the continuous queries |
457
|
|
|
|
|
|
|
started by calls to L, L, or |
458
|
|
|
|
|
|
|
L. The returned value will be an |
459
|
|
|
|
|
|
|
L object, or C on error. |
460
|
|
|
|
|
|
|
|
461
|
|
|
|
|
|
|
=cut |
462
|
|
|
|
|
|
|
|
463
|
|
|
|
|
|
|
sub next_track |
464
|
|
|
|
|
|
|
{ |
465
|
|
|
|
|
|
|
my $self = shift; |
466
|
|
|
|
|
|
|
my(%p)=@_; |
467
|
|
|
|
|
|
|
|
468
|
|
|
|
|
|
|
return $self->gettaggedresponse('LOC','AREA'); |
469
|
|
|
|
|
|
|
} |
470
|
|
|
|
|
|
|
|
471
|
|
|
|
|
|
|
|
472
|
|
|
|
|
|
|
1; |
473
|
|
|
|
|
|
|
|
474
|
|
|
|
|
|
|
=head1 AUTHOR |
475
|
|
|
|
|
|
|
|
476
|
|
|
|
|
|
|
Scott Gifford Egifford@umich.eduE, Esgifford@suspectclass.comE |
477
|
|
|
|
|
|
|
|
478
|
|
|
|
|
|
|
Copyright (C) 2005 The Regents of the University of Michigan. |
479
|
|
|
|
|
|
|
|
480
|
|
|
|
|
|
|
See the file LICENSE included with the distribution for license |
481
|
|
|
|
|
|
|
information. |
482
|
|
|
|
|
|
|
|
483
|
|
|
|
|
|
|
|
484
|
|
|
|
|
|
|
=head1 SEE ALSO |
485
|
|
|
|
|
|
|
|
486
|
|
|
|
|
|
|
L, L. |
487
|
|
|
|
|
|
|
|
488
|
|
|
|
|
|
|
=cut |