aboutsummaryrefslogtreecommitdiff
path: root/classes/BiblioIsisDb.php
blob: 7b8121163da485c0f9f523397a2fe11820216b70 (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
<?php

/**
 * Biblio::Isis implementation of IsisDb.
 */
class BiblioIsisDb implements IsisDb {
  /**
   * @var $fdt
   *   Field description table.
   */
  var $fdt;

  /**
   * Class instance of a perl interpreter;
   */
  var $perl;

  /**
   * @var $format
   *   Database format, derived from $schema.
   */
  var $format;

  /**
   * Constructor.
   *
   * @see IsisDb::__construct()
   */ 
  public function __construct($schema) {
    // Save db schema.
    $this->format = $schema;

    // Setup $fdt.
    foreach ($schema['fields'] as $field => $info) {
      $this->fdt[$field] = $info['name'];
    }

    // Create a perl instance.
    $this->perl = new Perl();
  }

  /**
   * Send requests to the perl backend.
   *
   * @param $method
   *   Backend method name to invoke.
   *
   * @param $args
   *   Backend method arguments.
   *
   * @return
   *   Backend return value.
   */
  function backend($method = 'count', $args = NULL) {
    // Setup the database.
    $name = $this->format['db']['name'];
    $db   = CinisisDb::file("$name/$name", 'db');

    // Setup arguments.
    if ($args != NULL) {
      $args = '('. $args .')';
    }

    try {
      // Call backend.
      return $this->perl->eval('
        use Biblio::Isis;

        my $isis = new Biblio::Isis(
           isisdb => "'. $db .'",
        );

        return $isis->'. $method . $args .';');
    }
    catch (PerlException $exception) {
      echo __CLASS__ .': Perl error: ' . $exception->getMessage();
      return FALSE;
    }    
  }

  /**
   * Read an entry.
   *
   * @see IsisDb::read()
   */  
  public function read($id) {
    // Database query.
    $results = $this->backend('to_hash', $id);

    // Tag results.
    $data = $this->tag($results);

    // Return the result.
    return $data;
  }

  /**
   * Return number of rows in the database.
   *
   * @see IsisDb::read()
   */  
  public function rows() {
    return $this->backend('count');
  }

  /**
   * Return an example schema.
   *
   * @see IsisDb::example()
   */  
  public function example() {
    return SchemaDb::example();
  }

  /**
   * Check configuration.
   *
   * @see IsisDb::check()
   */  
  public function check($schema, $section = NULL) {
    return SchemaDb::check($schema, $section);
  }

  /**
   * Tag results of a db query.
   *
   * This function converts the keys of query result from field numbers
   * to names.
   *
   * @param $results
   *   Database query results.
   *
   * @return
   *   Tagged database result.
   *
   * @todo
   *   Subfields.
   */
  function tag($results) {
    foreach ($results as $key => $value) {
      $name        = $this->format['fields'][$key]['name'];
      $data[$name] = $value;
    }

    return $data;    
  }
}