@Override
public StorageResults visit(Paging paging) {
query.setFirstResult(paging.getStart());
query.setFetchSize(AbstractQueryHandler.JDBC_FETCH_SIZE);
query.setMaxResults(paging.getLimit());
return null;
}
@Override
public StorageResults visit(Select select) {
// TMDM-4654: Checks if entity has a composite PK.
Set<ComplexTypeMetadata> compositeKeyTypes = new HashSet<ComplexTypeMetadata>();
// TMDM-7496: Search should include references to reused types
Collection<ComplexTypeMetadata> types =
new HashSet<ComplexTypeMetadata>(select.accept(new SearchTransitiveClosure()));
for (ComplexTypeMetadata type : types) {
if (type.getKeyFields().size() > 1) {
compositeKeyTypes.add(type);
}
}
if (!compositeKeyTypes.isEmpty()) {
StringBuilder message = new StringBuilder();
Iterator it = compositeKeyTypes.iterator();
while (it.hasNext()) {
ComplexTypeMetadata compositeKeyType = (ComplexTypeMetadata) it.next();
message.append(compositeKeyType.getName());
if (it.hasNext()) {
message.append(',');
}
}
throw new FullTextQueryCompositeKeyException(message.toString());
}
// Removes Joins and joined fields.
List<Join> joins = select.getJoins();
if (!joins.isEmpty()) {
Set<ComplexTypeMetadata> joinedTypes = new HashSet<ComplexTypeMetadata>();
for (Join join : joins) {
joinedTypes.add(join.getRightField().getFieldMetadata().getContainingType());
}
for (ComplexTypeMetadata joinedType : joinedTypes) {
types.remove(joinedType);
}
List<TypedExpression> filteredFields = new LinkedList<TypedExpression>();
for (TypedExpression expression : select.getSelectedFields()) {
if (expression instanceof Field) {
FieldMetadata fieldMetadata = ((Field) expression).getFieldMetadata();
if (joinedTypes.contains(fieldMetadata.getContainingType())) {
TypeMapping mapping =
mappings.getMappingFromDatabase(fieldMetadata.getContainingType());
filteredFields.add(
new Alias(
new StringConstant(StringUtils.EMPTY),
mapping.getUser(fieldMetadata).getName()));
} else {
filteredFields.add(expression);
}
} else {
filteredFields.add(expression);
}
}
selectedFields.clear();
selectedFields.addAll(filteredFields);
}
// Handle condition
Condition condition = select.getCondition();
if (condition == null) {
throw new IllegalArgumentException("Expected a condition in select clause but got 0.");
}
// Create Lucene query (concatenates all sub queries together).
FullTextSession fullTextSession = Search.getFullTextSession(session);
Query parsedQuery = select.getCondition().accept(new LuceneQueryGenerator(types));
// Create Hibernate Search query
Set<Class> classes = new HashSet<Class>();
for (ComplexTypeMetadata type : types) {
String className = ClassCreator.getClassName(type.getName());
try {
ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
classes.add(contextClassLoader.loadClass(className));
} catch (ClassNotFoundException e) {
throw new RuntimeException("Could not find class '" + className + "'.", e);
}
}
FullTextQuery fullTextQuery =
fullTextSession.createFullTextQuery(
parsedQuery, classes.toArray(new Class<?>[classes.size()]));
// Very important to leave this null (would disable ability to search across different types)
fullTextQuery.setCriteriaQuery(null);
fullTextQuery.setSort(Sort.RELEVANCE); // Default sort (if no order by specified).
query =
EntityFinder.wrap(
fullTextQuery,
(HibernateStorage) storage,
session); // ensures only MDM entity objects are returned.
// Order by
for (OrderBy current : select.getOrderBy()) {
current.accept(this);
}
// Paging
Paging paging = select.getPaging();
paging.accept(this);
pageSize = paging.getLimit();
boolean hasPaging = pageSize < Integer.MAX_VALUE;
if (!hasPaging) {
return createResults(query.scroll(ScrollMode.FORWARD_ONLY));
} else {
return createResults(query.list());
}
}