@Override
public BooleanExpression exists() {
if (queryMixin.getMetadata().getJoins().isEmpty()) {
throw new IllegalArgumentException("No sources given");
}
return unique(queryMixin.getMetadata().getJoins().get(0).getTarget()).exists();
}
private QueryMetadata projection(Expression<?>... projection) {
QueryMetadata metadata = queryMixin.getMetadata().clone();
for (Expression<?> expr : projection) {
metadata.addProjection(nullAsTemplate(expr));
}
return metadata;
}
private QueryMetadata projection(
Expression<?> first, Expression<?> second, Expression<?>[] rest) {
QueryMetadata metadata = queryMixin.getMetadata().clone();
metadata.addProjection(nullAsTemplate(first));
metadata.addProjection(nullAsTemplate(second));
for (Expression<?> expr : rest) {
metadata.addProjection(nullAsTemplate(expr));
}
return metadata;
}
