aboutsummaryrefslogtreecommitdiffstats
path: root/RelationSet.pm
blob: b5cae289c11a31f523dea006f56bc28583375782 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
# 
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
# 
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
# 
# The Original Code is the Bugzilla Bug Tracking System.
# 
# The Initial Developer of the Original Code is Netscape Communications
# Corporation. Portions created by Netscape are
# Copyright (C) 2000 Netscape Communications Corporation.  All
# Rights Reserved.
# 
# Contributor(s): Dan Mosedale <dmose@mozilla.org>
#                 Terry Weissman <terry@mozilla.org>
#                 Dave Miller <dave@intrec.com>

# This object models a set of relations between one item and a group
# of other items.  An example is the set of relations between one bug
# and the users CCed on that bug.  Currently, the relation objects are
# expected to be bugzilla userids.  However, this could and perhaps
# should be generalized to work with non userid objects, such as
# keywords associated with a bug.  That shouldn't be hard to do; it
# might involve turning this into a virtual base class, and having
# UserSet and KeywordSet types that inherit from it.

use diagnostics;
use strict;

require "globals.pl";

package RelationSet;
use CGI::Carp qw(fatalsToBrowser);

# create a new empty RelationSet
#
sub new {
  my $type = shift();

  # create a ref to an empty hash and bless it
  #
  my $self = {};
  bless $self, $type;

  # construct from a comma-delimited string
  # 
  if ($#_ == 0) {
    $self->mergeFromString($_[0]);
  }
  # unless this was a constructor for an empty list, somebody screwed up.
  #
  elsif ( $#_ != -1 ) {
    confess("invalid number of arguments");
  }

  # bless as a RelationSet
  #
  return $self;
}

# Assumes that the set of relations "FROM $table WHERE $constantSql and 
# $column = $value" is currently represented by $self, and this set should
# be updated to look like $other.  
#
# Returns an array of two strings, one INSERT and one DELETE, which will
# make this change.  Either or both strings may be the empty string,
# meaning that no INSERT or DELETE or both (respectively) need to be done.
#
# THE CALLER IS RESPONSIBLE FOR ANY DESIRED LOCKING AND/OR CONSISTENCY 
# CHECKS (not to mention doing the SendSQL() calls).
#
sub generateSqlDeltas {
  ($#_ == 5) || confess("invalid number of arguments");
  my ( $self, # instance ptr to set representing the existing state
       $endState, # instance ptr to set representing the desired state
       $table, # table where these relations are kept
       $invariantName, # column held const for a RelationSet (often "bug_id")
       $invariantValue, # what to hold the above column constant at
       $columnName # the column which varies (often a userid)
     ) = @_;

  # construct the insert list by finding relations which exist in the
  # end state but not the current state.
  #
  my @endStateRelations = keys(%$endState);
  my @insertList = ();
  foreach ( @endStateRelations ) {
    push ( @insertList, $_ ) if ( ! exists $$self{"$_"} );
  }

  # we've built the list.  If it's non-null, add required sql chrome.
  #
  my $sqlInsert="";
  if ( $#insertList > -1 ) {
    $sqlInsert = "INSERT INTO $table ($invariantName, $columnName) VALUES " .
      join (",", 
	    map ( "($invariantValue, $_)" , @insertList ) 
	   );
  }
     
  # construct the delete list by seeing which relations exist in the
  # current state but not the end state
  #
  my @selfRelations = keys(%$self);
  my @deleteList = ();
  foreach ( @selfRelations ) {
    push (@deleteList, $_) if ( ! exists $$endState{"$_"} );
  }

  # we've built the list.  if it's non-empty, add required sql chrome.
  #
  my $sqlDelete = "";
  if ( $#deleteList > -1 ) {
    $sqlDelete = "DELETE FROM $table WHERE $invariantName = $invariantValue " .
      "AND $columnName IN ( " . join (",", @deleteList) . " )";
  } 

  return ($sqlInsert, $sqlDelete);
}

# compare the current object with another.  
#
sub isEqual {
  ($#_ == 1) || confess("invalid number of arguments");
  my $self = shift();
  my $other = shift();

  # get arrays of the keys for faster processing
  #
  my @selfRelations = keys(%$self);
  my @otherRelations = keys(%$other);
 
  # make sure the arrays are the same size
  #
  return 0 if ( $#selfRelations != $#otherRelations );

  # bail out if any of the elements are different
  #
  foreach my $relation ( @selfRelations ) {
    return 0 if ( !exists $$other{$relation})
  }

  # we made it!
  #
  return 1;

}

# merge the results of a SQL command into this set
#
sub mergeFromDB {
  ( $#_ == 1 ) || confess("invalid number of arguments");
  my $self = shift();

  &::SendSQL(shift());
  while (my @row = &::FetchSQLData()) {
    $$self{$row[0]} = 1;
  }

  return;
}

# merge a set in string form into this set
#
sub mergeFromString {
  ($#_ == 1) || confess("invalid number of arguments");
  my $self = shift();

  # do the merge
  #
  foreach my $person (split(/[ ,]/, shift())) {
    if ($person ne "") {
      $$self{&::DBNameToIdAndCheck($person)} = 1;
    }
  }
}

# remove a set in string form from this set
#
sub removeItemsInString {
  ($#_ == 1) || confess("invalid number of arguments");
  my $self = shift();

  # do the merge
  #
  foreach my $person (split(/[ ,]/, shift())) {
    if ($person ne "") {
      my $dbid = &::DBNameToIdAndCheck($person);
      if (exists $$self{$dbid}) {
        delete $$self{$dbid};
      }
    }
  }
}

# remove a set in array form from this set
#
sub removeItemsInArray {
  ($#_ > 0) || confess("invalid number of arguments");
  my $self = shift();

  # do the merge
  #
  while (my $person = shift()) {
    if ($person ne "") {
      my $dbid = &::DBNameToIdAndCheck($person);
      if (exists $$self{$dbid}) {
        delete $$self{$dbid};
      }
    }
  }
}

# return the number of elements in this set
#
sub size {
  my $self = shift();

  my @k = keys(%$self);
  return $#k++;
}

# return this set in array form
#
sub toArray {
  my $self= shift();

  return keys(%$self);
}

# return this set as an array of strings
#
sub toArrayOfStrings {
  ($#_ == 0) || confess("invalid number of arguments");
  my $self = shift();

  my @result = ();
  foreach my $i ( keys %$self ) {
    push @result, &::DBID_to_name($i);
  }

  return sort(@result);
}  

# return this set in string form (comma-separated and sorted)
#
sub toString {
  ($#_ == 0) || confess("invalid number of arguments");
  my $self = shift();

  my @result = ();
  foreach my $i ( keys %$self ) {
    push @result, &::DBID_to_name($i);
  }

  return join(',', sort(@result));
}