GeoKnow/Jassa-Core

var Class = require('../../ext/Class');

var VarUtils = require('../../sparql/VarUtils');
var CountUtils = require('../CountUtils');
var HashMap = require('../../util/collection/HashMap');

var LookupService = require('../../service/lookup_service/LookupService');

var LookupServiceFacetExactCount = Class.create(LookupService, {
    initialize: function(sparqlService, facetRelationIndex) {
        this.sparqlService = sparqlService;
        this.facetRelationIndex = facetRelationIndex;
    },

    lookup: function(properties) {
        var countVar = VarUtils.c;
        var subQueries = CountUtils.createQueriesExactCount(this.facetRelationIndex, countVar, properties, this.rowLimit);
        var exec = CountUtils.execQueries(this.sparqlService, subQueries, this.facetRelationIndex.getSourceVar(), countVar);
        
        var result = exec.then(function(map) {
            var r = new HashMap();
            
            var entries = map.entries();
            entries.forEach(function(entry) {
                var property = entry.key;
                var count = entry.val;
                
                var countInfo = {
                    count: count,
                    hasMoreItems: false
                };
                
                r.put(property, countInfo);
            });
            
            return r;
        });

        return result;
    },
});

module.exports = LookupServiceFacetExactCount;