/** @inheritDoc */
public <T> T find(final Class<T> theClass, final Object theObj) {
assertOpen();
try {
AnnotationChecker.assertValid(theClass);
} catch (EmpireException e) {
throw new IllegalArgumentException(e);
}
try {
if (DataSourceUtil.exists(getDataSource(), EmpireUtil.asPrimaryKey(theObj))) {
T aT = RdfGenerator.fromRdf(theClass, EmpireUtil.asPrimaryKey(theObj), getDataSource());
postLoad(aT);
return aT;
} else {
return null;
}
} catch (InvalidRdfException e) {
throw new IllegalArgumentException(
"Type is not valid, or object with key is not a valid Rdf Entity.", e);
} catch (DataSourceException e) {
throw new PersistenceException(e);
}
}
/** @inheritDoc */
public boolean contains(final Object theObj) {
assertStateOk(theObj);
try {
return DataSourceUtil.exists(getDataSource(), theObj);
} catch (DataSourceException e) {
throw new PersistenceException(e);
}
}
/**
* Performs the same checks as assertContains, but returns the Graph describing the resource as a
* result so you do not need to perform a subsequent call to the database to get the data that is
* checked during containment checks in the first place, thus saving a query to the database.
*
* @param theObj the object that should exist.
* @return The graph describing the resource
* @throws IllegalArgumentException thrown if the object does not exist in the database
*/
private ExtGraph assertContainsAndDescribe(Object theObj) {
assertStateOk(theObj);
try {
ExtGraph aGraph = DataSourceUtil.describe(getDataSource(), theObj);
if (aGraph.isEmpty()) {
throw new IllegalArgumentException("Entity does not exist: " + theObj);
}
return aGraph;
} catch (QueryException e) {
throw new PersistenceException(e);
}
}