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<?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 $key is not set.
*
* @fixme
* Repetitive fields are not being tagged.
*/
function tag($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.
$this->subfield($data, $name, $key);
}
}
return $data;
}
function has_subfields($key) {
if (isset($this->format['fields'][$key]['subfields'])) {
return TRUE;
}
return FALSE;
}
function subfield(&$data, $name, $key) {
if ($this->has_subfields($key) && is_array($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]);
}
}
}
}
/**
* 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.
*
* @return
* True if repetitive, false otherwise.
*
* @todo
* Warn on configuration/data mismatch ("config says that
* $field is non repetitive but data shows a repetition").
*/
function is_repetitive($field, $value) {
if (isset($this->format['fields'][$field]['repeat']) &&
$this->format['fields'][$field]['repeat'] == FALSE && is_array($value)) {
return FALSE;
}
return TRUE;
}
/**
* 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 $value
* Query field result.
*
* @return
* The value according to the repetition config.
*/
function repetition($key, $value) {
if ($this->is_repetitive($key, $value)) {
return $value;
}
else {
return $value[0];
}
}
/**
* 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);
}
}
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