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comparison weight/probability/ad_weight_probability.module @ 1:948362c2a207 ad

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update advertisement
author pierre
date Thu, 02 Apr 2009 15:28:21 +0000
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children 0d1c70d51fbe
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0:d8a3998dac8e 1:948362c2a207
1 <?php
2 // $Id: ad_weight_probability.module,v 1.1.4.5 2009/03/27 19:11:50 jeremy Exp $
3
4 /**
5 * @file
6 * A plug in for the ad.module, allowing an admin to set the probability that
7 * a given advertisement will be displayed.
8 *
9 * Copyright (c) 2008-2009.
10 * Jeremy Andrews <jeremy@tag1consulting.com>.
11 */
12
13 define('AD_PROBABILITY_DEFAULT', 100);
14
15 /**
16 * Implementation of hook_form_alter().
17 * Generate a form for assigning a weight to an advertisement.
18 */
19 function ad_weight_probability_form_alter(&$form, &$form_state, $form_id) {
20 if (isset($form['type']) && $form_id == 'ad_node_form') {
21 $node = $form['#node'];
22 $form['weighting'] = array(
23 '#type' => 'fieldset',
24 '#access' => user_access('configure ad probability'),
25 '#title' => t('Weight'),
26 '#collapsible' => TRUE,
27 '#collapsed' => FALSE,
28 );
29 $form['weighting']['probability'] = array(
30 '#type' => 'select',
31 '#access' => user_access('configure ad probability'),
32 '#title' => t('Probability'),
33 '#options' => _ad_weight_probability_weights(),
34 '#default_value' => isset($node->probability) ? $node->probability : 100,
35 '#description' => t('The greater the probability, the more frequently this advertisement will be displayed. An advertisement with a probablity of 2 will be displayed twice as frequently as an advertisement with a probability of 1.'),
36 );
37 $form['weighting']['#weight'] = -1;
38 }
39 }
40
41 /**
42 * Implementation of hook_nodeapi().
43 */
44 function ad_weight_probability_nodeapi($node, $op, $arg = 0) {
45 switch ($op) {
46 case 'load':
47 return _ad_weight_probability_node_load($node);
48 case 'insert':
49 case 'update':
50 if (user_access('configure ad probability')) {
51 // Fully load the node object to confirm that we are working with an
52 // advertisement.
53 $ad = node_load($node->nid);
54 if (isset($ad->adtype)) {
55 return _ad_weight_probability_node_save($node, $op);
56 }
57 }
58 case 'delete':
59 return _ad_weight_probability_node_delete($node);
60 }
61 }
62
63 /**
64 * Implementation of hook_perm().
65 */
66 function ad_weight_probability_perm() {
67 return array(t('configure ad probability'));
68 }
69
70 /**
71 * Implementation of hook_ad_build_cache().
72 */
73 function ad_weight_probability_ad_build_cache() {
74 $cache = array();
75 $active = db_query("SELECT a.aid, p.probability FROM {ads} a LEFT JOIN {ad_weight_probability} p ON a.aid = p.aid WHERE adstatus = 'active'");
76 while ($ad = db_fetch_object($active)) {
77 $probability = $ad->probability ? $ad->probability : AD_PROBABILITY_DEFAULT;
78 $ads[$ad->aid] = $probability;
79 }
80 $cache['weight']['probability'] = $ads;
81 $cache['weight']['hook_weight'] = array(
82 'weight' => 10,
83 'file' => drupal_get_path('module', 'ad_weight_probability') .'/ad_weight_probability.inc',
84 'function' => 'ad_weight_probability_cache_filter',
85 );
86 return $cache;
87 }
88
89 /**
90 * Helper function, load the probability from the database.
91 */
92 function _ad_weight_probability_node_load($node) {
93 $probability = (int)db_result(db_query('SELECT probability FROM {ad_weight_probability} WHERE aid = %d', $node->nid));
94 $output['probability'] = $probability ? $probability : AD_PROBABILITY_DEFAULT;
95 return $output;
96 }
97
98 /**
99 * Helper function, save the probability to the database.
100 */
101 function _ad_weight_probability_node_save($node) {
102 if (is_object($node) && $node->nid) {
103 db_query('UPDATE {ad_weight_probability} SET probability = %d WHERE aid = %d', $node->probability, $node->nid);
104 if (!db_affected_rows()) {
105 db_query('INSERT INTO {ad_weight_probability} (aid, probability) VALUES(%d, %d)', $node->nid, $node->probability);
106 }
107 }
108 }
109
110 /**
111 * Helper function, delete the probability from the database.
112 */
113 function _ad_weight_probability_node_delete($node) {
114 db_query('DELETE FROM {ad_weight_probability} WHERE aid = %d', $node->nid);
115 }
116
117 /**
118 * Available weight probabilities.
119 */
120 function _ad_weight_probability_weights() {
121 return array(
122 25 => t('1/4'),
123 33 => t('1/3'),
124 50 => t('1/2'),
125 100 => t('1'),
126 200 => t('2'),
127 300 => t('3'),
128 400 => t('4'),
129 );
130 }
131