How can i dynamically Create Criteria Mongodb Spring data mongo Template - spring

Question

I need to dynamically create a criteria but i am having problem how can i build criteria dynamically.
I need exactly the same as in here Build dynamic queries with Spring Data MongoDB Criteria but i am getting an error while i am converting my Criteria list to a toArray as its keep saying that orCriteria does not have support for Criteria[]
here is my effort so far
Here is my query structure
{
"query":{
"where":[{
"or":[
{
"fieldName":"title","fieldValue":"Demo Event NEW YORK IIII22222",
"operator":"equal"
},
{
"fieldName":"createdBy","fieldValue":"system",
"operator":"equal"
}
]
}
]
}
}
and here is my parsing it to create criteria
if(null != eventSearch.getQuery())
{
if(null != eventSearch.getQuery().getWhere() && eventSearch.getQuery().getWhere().size()> 0)
{
for (Where whereClause : eventSearch.getQuery().getWhere()) {
if(null != whereClause.getOr() && whereClause.getOr().size() > 0){
for (Field field: whereClause.getOr()) {
if(field.getOperator().equalsIgnoreCase(QueryOperator.IS))
{
// So i need to append an or Condition to main query for each or object in my query can anyone tell me how can i achieve this?
query.addCriteria(Criteria.where(whereClause.getFieldName()).gte(whereClause.getFieldValue()));
}
}
}
}
}
I need to pass my all where clauses with in or object to orOperator function as a parameter
Criteria c = new Criteria().orOperator(Need to pass my where clauses here);

Answer 1

Better use an ArrayList of Criteria to keep $or criteria as below.
List<Criteria> orCriteriaList = new ArrayList<Criteria>();
for (Field field: whereClause.getOr()) {
if(field.getOperator().equalsIgnoreCase(QueryOperator.IS)){
Criteria c1 = Criteria.where(whereClause.getFieldName()).gte(whereClause.getFieldValue());
orCriteriaList.add(c1);
}
}
Then build the main query from this orCriteriaList as
mainQuery.addCriteria(new Criteria().orOperator(orCriteriaList.toArray(new Criteria[orCriteriaList.size()])));