/**
* Creates a predicate node using the given string as a lookup in the dictionary.
*
* @param key The key into the dictionary
* @param elementFactory The factory for creating nodes
* @return The predicate as a node
* @throws MetaDataException
*/
public static PredicateNode createPredicate(String key, GraphElementFactory elementFactory)
throws MetaDataException {
try {
// Create the type node
return (PredicateNode) elementFactory.createResource(RDF.TYPE);
} catch (GraphElementFactoryException graphElementFactoryException) {
throw new MetaDataException(
"Failed to create predicate node for key: " + key, graphElementFactoryException);
}
}
/**
* Creates an object node using a literal value.
*
* @param value The value of the literal
* @param elementFactory The factory for creating nodes
* @return The object node representing the literal
* @throws MetaDataException
*/
public static ObjectNode createObjectLiteral(String value, GraphElementFactory elementFactory)
throws MetaDataException {
try {
// The default type is file
return (ObjectNode) elementFactory.createLiteral(value);
} catch (GraphElementFactoryException graphElementFactoryException) {
throw new MetaDataException(
"Failed to create object node for " + value, graphElementFactoryException);
}
}
/**
* Creates a predicate node using the given given uri.
*
* @param reference The URI reference to use as the predicate
* @param elementFactory The factory for creating nodes
* @return The predicate as a node
* @throws MetaDataException
*/
public static PredicateNode createPredicateFromURI(
URI reference, GraphElementFactory elementFactory) throws MetaDataException {
try {
// Create the type node
return (PredicateNode) elementFactory.createResource(reference);
} catch (GraphElementFactoryException graphElementFactoryException) {
throw new MetaDataException(
"Failed to create predicate node for URI " + reference.toString(),
graphElementFactoryException);
}
}