http://www.mediawiki.org/wiki/Special:Code/MediaWiki/60534
Revision: 60534
Author: mkroetzsch
Date: 2010-01-01 14:42:51 +0000 (Fri, 01 Jan 2010)
Log Message:
-----------
allow null subjects; added getHash() function that will be useful for avoiding
DB writes if data did not change
Modified Paths:
--------------
trunk/extensions/SemanticMediaWiki/includes/SMW_SemanticData.php
Modified: trunk/extensions/SemanticMediaWiki/includes/SMW_SemanticData.php
===================================================================
--- trunk/extensions/SemanticMediaWiki/includes/SMW_SemanticData.php
2010-01-01 01:35:37 UTC (rev 60533)
+++ trunk/extensions/SemanticMediaWiki/includes/SMW_SemanticData.php
2010-01-01 14:42:51 UTC (rev 60534)
@@ -39,9 +39,10 @@
static protected $m_propertyprefix = false;
/// SMWWikiPageValue object that is the subject of this container.
+ /// Subjects that are NULL are used to represent "internal objects"
only.
protected $subject;
- public function __construct(SMWWikiPageValue $subject, $noduplicates =
true) {
+ public function __construct($subject, $noduplicates = true) {
$this->subject = $subject;
$this->m_noduplicates = $noduplicates;
$this->stubobject = false;
@@ -102,6 +103,25 @@
}
/**
+ * Generate a hash value to simplify the comparison of this data
container with other
+ * containers. The hash uses PHP's md5 implementation, which is among
the fastest hash
+ * algorithms that PHP offers.
+ */
+ public function getHash() {
+ $ctx = hash_init('md5');
+ if ($this->subject !== NULL) { // here and below, use "_#_" to
separate values; really not much care needed here
+ hash_update($ctx, '_#_' . $this->subject->getHash());
+ }
+ foreach ($this->getProperties() as $property) {
+ hash_update($ctx, '_#_' . $property->getHash() . '##');
+ foreach ($this->getPropertyValues($property) as $dv) {
+ hash_update($ctx, '_#_' . $dv->getHash());
+ }
+ }
+ return hash_final($ctx);
+ }
+
+ /**
* Return true if there are any visible properties.
* @note While called "visible" this check actually refers to the
function
* SMWPropertyValue::isShown(). The name is kept for compatibility.
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