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
|
<?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', $id);
if ($results) {
// Tag results.
$data = $this->tag($results);
// Charset conversion.
if (is_array($data)) {
array_walk_recursive($data, array(__CLASS__, 'charset'));
}
// Return the result.
return $data;
}
}
/**
* Return number of rows in the database.
*
* @see IsisDb::read()
*/
public function rows() {
return $this->backend('count');
}
/**
* Return an example schema.
*
* @see IsisDb::example()
*/
public function example() {
return SchemaDb::example();
}
/**
* Check configuration.
*
* @see IsisDb::check()
*/
static function check($schema, $section = NULL) {
// Check API availability.
if (!class_exists('Perl')) {
throw new Exception('Could not find Perl class. Please check your php-perl installation.');
return FALSE;
}
// Check schema configuration.
return SchemaDb::check($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
* Alternative handling for when $key is not set.
*/
function tag($results) {
foreach ($results as $key => $value) {
// Key '000' used to hold MFN.
if ($key != '000') {
if (!isset($this->format['fields'][$key])) {
continue;
}
$name = $this->format['fields'][$key]['name'];
$data[$name] = $this->repetition($key, $value);
// Subfield handling.
if (isset($this->format['fields'][$key]['subfields']) && is_array($data[$name])) {
foreach ($data[$name] as $subkey => $subvalue) {
if (isset($this->format['fields'][$key]['subfields'][$subkey])) {
$subname = $this->format['fields'][$key]['subfields'][$subkey];
} else {
$subname = $subkey;
}
$data[$name][$subname] = $subvalue;
if ($subkey != $subname) {
unset($data[$name][$subkey]);
}
}
}
}
}
return $data;
}
/**
* Deals with repetition.
*
* As Biblio::Isis always return field values as arrays, we
* have to check the database schema to see if we have to
* convert then to a single value.
*
* @param $field
* Database field.
*
* @param $value
* Query field result.
*
* @return
* The value according to the repetition config.
*/
function repetition($field, $value) {
if (isset($this->format['fields'][$field]['repeat']) &&
$this->format['fields'][$field]['repeat'] == FALSE && is_array($value)) {
return $value[0];
}
return $value;
}
/**
* Charset conversion.
*
* Converts a string from the database charset to UTF-8.
*
* @param $data
* String to be converted.
*
* @return
* String converted to UTF-8.
*/
function charset(&$data) {
$data = iconv($this->format['db']['charset'], 'UTF-8', $data);
}
}
|
