public Predicate addFilter(
Root<UserEntity> root, FilterConstraint constraint, String value, CriteriaBuilder cb) {
if (constraint != FilterConstraint.PRESENT
&& (field.getType() == ExtensionFieldType.INTEGER
|| field.getType() == ExtensionFieldType.DECIMAL)) {
value = numberPadder.pad(value);
}
final SetJoin<UserEntity, ExtensionFieldValueEntity> join =
createOrGetJoin(
generateAlias(urn + "." + field.getName()), root, UserEntity_.extensionFieldValues);
Predicate filterPredicate =
constraint.createPredicateForExtensionField(
join.get(ExtensionFieldValueEntity_.value), value, field, cb);
Predicate valueBelongsToField =
cb.equal(
join.get(ExtensionFieldValueEntity_.extensionField)
.get(ExtensionFieldEntity_.internalId),
field.getInternalId());
join.on(valueBelongsToField);
return filterPredicate;
}
@SuppressWarnings("unchecked")
protected SetJoin<UserEntity, ExtensionFieldValueEntity> createOrGetJoin(
String alias,
Root<UserEntity> root,
SetAttribute<UserEntity, ExtensionFieldValueEntity> attribute) {
for (Join<UserEntity, ?> currentJoin : root.getJoins()) {
if (currentJoin.getAlias() == null) {
// if alias is null, it is not an alias for an extension join, so we ignore it
continue;
}
if (currentJoin.getAlias().equals(alias)) {
return (SetJoin<UserEntity, ExtensionFieldValueEntity>) currentJoin;
}
}
final SetJoin<UserEntity, ExtensionFieldValueEntity> join = root.join(attribute, JoinType.LEFT);
join.alias(alias);
return join;
}