driver-core/src/main/com/mongodb/BasicDBObjectBuilder.java
@SuppressWarnings("unchecked")
    public static BasicDBObjectBuilder start(final Map documentAsMap) {
        BasicDBObjectBuilder builder = new BasicDBObjectBuilder();
        Iterator<Map.Entry> i = documentAsMap.entrySet().iterator();
        while (i.hasNext()) {
            Map.Entry entry = i.next();
            builder.add(entry.getKey().toString(), entry.getValue());
        }
        return builder;
    }
@SuppressWarnings("unchecked")
    public static BasicDBObjectBuilder start(final Map documentAsMap) {
        BasicDBObjectBuilder builder = new BasicDBObjectBuilder();
        Iterator<Map.Entry> i = documentAsMap.entrySet().iterator();
        while (i.hasNext()) {
            Map.Entry entry = i.next();
            builder.add(entry.getKey().toString(), entry.getValue());
        }
        return builder;
    }
@ SuppressWarnings ( "unchecked" ) public static BasicDBObjectBuilder start ( final Map documentAsMap ) { BasicDBObjectBuilder builder = new BasicDBObjectBuilder ( ) ; Iterator < Map . Entry > i = documentAsMap . entrySet ( ) . iterator ( ) ; while ( i . hasNext ( ) ) { Map . Entry entry = i . next ( ) ; builder . add ( entry . getKey ( ) . toString ( ) , entry . getValue ( ) ) ; } return builder ; }
Creates an object builder from an existing map of key value pairs.

@param documentAsMap a document in Map form.
@return the new builder
Creates an object builder from an existing map of key value pairs .