1 files changed, 105 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/DataValues/ValueValidators/PropertySpecificationConstraintValueValidator.php b/www/wiki/extensions/SemanticMediaWiki/src/DataValues/ValueValidators/PropertySpecificationConstraintValueValidator.php
new file mode 100644
index 00000000..b58903d9
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/DataValues/ValueValidators/PropertySpecificationConstraintValueValidator.php
@@ -0,0 +1,105 @@
+<?php
+
+namespace SMW\DataValues\ValueValidators;
+
+use SMWDataValue as DataValue;
+
+/**
+ * @private
+ *
+ * @license GNU GPL v2+
+ * @since 2.5
+ *
+ * @author mwjames
+ */
+class PropertySpecificationConstraintValueValidator implements ConstraintValueValidator {
+
+	/**
+	 * @var boolean
+	 */
+	private $hasConstraintViolation = false;
+
+	/**
+	 * @var array
+	 */
+	private static $inMemoryLabelToLanguageTracer = [];
+
+	/**
+	 * @since 2.5
+	 *
+	 * {@inheritDoc}
+	 */
+	public function hasConstraintViolation() {
+		return $this->hasConstraintViolation;
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * {@inheritDoc}
+	 */
+	public function validate( $dataValue ) {
+
+		$this->hasConstraintViolation = false;
+
+		if (
+			!$dataValue instanceof DataValue ||
+			$dataValue->getProperty() === null ||
+			$dataValue->getContextPage() === null ||
+			$dataValue->getContextPage()->getNamespace() !== SMW_NS_PROPERTY ) {
+			return $this->hasConstraintViolation;
+		}
+
+		if ( $dataValue->getProperty()->getKey() === '_PPLB' ) {
+			return $this->doValidateCodifiedPreferredPropertyLabelConstraints( $dataValue );
+		}
+	}
+
+	private function doValidateCodifiedPreferredPropertyLabelConstraints( $dataValue ) {
+
+		// Annotated but not enabled
+		if ( !$dataValue->isEnabledFeature( SMW_DV_PPLB ) ) {
+			return $dataValue->addErrorMsg(
+				[
+					'smw-datavalue-feature-not-supported',
+					'SMW_DV_PPLB'
+				]
+			);
+		}
+
+		$value = $dataValue->toArray();
+		$dbKey = $dataValue->getContextPage()->getDBKey();
+
+		// Language has been already assigned!
+		if ( ( $isKnownBy = $this->isKnownByLabelAndLanguage( $value, $dbKey ) ) !== false ) {
+			$dataValue->addErrorMsg(
+				[
+					'smw-property-preferred-label-language-combination-exists',
+					$value['_TEXT'],
+					$value['_LCODE'],
+					$isKnownBy
+				]
+			);
+		}
+	}
+
+	private function isKnownByLabelAndLanguage( $value, $dbkey ) {
+
+		$lang = isset( $value['_LCODE'] ) ? $value['_LCODE'] : false;
+
+		if ( !isset( self::$inMemoryLabelToLanguageTracer[$dbkey] ) ) {
+			self::$inMemoryLabelToLanguageTracer[$dbkey] = [];
+		}
+
+		if ( $lang && !isset( self::$inMemoryLabelToLanguageTracer[$dbkey][$lang] ) ) {
+			self::$inMemoryLabelToLanguageTracer[$dbkey][$lang] = $value['_TEXT'];
+		}
+
+		if ( $lang && self::$inMemoryLabelToLanguageTracer[$dbkey][$lang] !== $value['_TEXT'] ) {
+			return self::$inMemoryLabelToLanguageTracer[$dbkey][$lang];
+		}
+
+		return false;
+	}
+
+}