How to access a variable from java objects in a java collection?

Question

I am using Mongo Java Driver, and I am trying to use filters on the collection.find() function. For example, when I have a key which is a java object, the class of which contains certain fields:

Document document = (Document) collection.find(and(
    eq("m_seniority", key.getM_seniority()),
    eq("m_currency",key.getM_currency()),
    eq("m_redCode",key.getM_redCode()),
    eq("m_companyId",key.getM_companyId())
)).first();

I use the above command. But when I want to do that in bulk, I am being passed a collection of keys, ( Collection keys ), I can't access particular variables of the java objects inside as below:

List<Document> docs =  (List<Document>) collection.find(and(
    eq("m_seniority", keys.getM_seniority()),
    eq("m_currency",keys.getM_currency()),
    eq("m_redCode",keys.getM_redCode()),
    eq("m_companyId",keys.getM_companyId())
)).into(new ArrayList<Document>());

Because getters are not of the collection, but just the objects, i can't use getters on the collection. How do I do this?

Answer 1

To create an or query on all of the Collection keys:

List<Bson> keyFilters = new ArrayList<>();
// for each key create an 'and' filter on seniority, currency, redcode and companyid
for (Key key : keys) {        
    keyFilters.add(
        Filters.and(eq("m_seniority", key.getM_seniority()),
            Filters.eq("m_currency",key.getM_currency()),
            Filters.eq("m_redCode",key.getM_redCode()),
            Filters.eq("m_companyId",key.getM_companyId())
        )
    );
}

List<Document> docs =  (List<Document>) collection.find(
        // 'or' all of the individual key filters
        Filters.or(keyFilters)
).into(new ArrayList<Document>());