TimeSeriesDecoder.java

/*
 * Copyright 2011 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.tsdb.tsdash.client.service.json;

import com.facebook.tsdb.tsdash.client.model.MetricHeader;
import com.facebook.tsdb.tsdash.client.model.TimeSeriesResponse;
import com.google.gwt.core.client.JsDate;
import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;

public class TimeSeriesDecoder extends JSONDecoder<TimeSeriesResponse> {

    private void replaceDateObject(JSONArray rowArray) {
        JSONObject dateObj = rowArray.get(0).isObject();
        double value = dateObj.get("v").isNumber().doubleValue();
        dateObj.put("v", new JSONObject(JsDate.create(value)));
    }

    @Override
    TimeSeriesResponse decode(String jsonText) {
        TimeSeriesResponse response = new TimeSeriesResponse();
        response.dataSize = jsonText.length();
        JSONObject jsonObj = JSONParser.parseStrict(jsonText).isObject();
        response.serverLoadTime = (long) jsonObj.get("loadtime").isNumber()
                .doubleValue();
        response.timeSeriesJSON = jsonObj.get("datatable").isObject();
        JSONArray rowsObj = response.timeSeriesJSON.get("rows").isArray();
        response.rows = rowsObj.size();
        for (int i = 0; i < rowsObj.size(); i++) {
            replaceDateObject(rowsObj.get(i).isObject().get("c").isArray());
        }
        JSONArray jsonMetrics = jsonObj.get("metrics").isArray();
        for (int i = 0; i < jsonMetrics.size(); i++) {
            JSONObject metricObj = jsonMetrics.get(i).isObject();
            response.metrics.add(MetricHeader.fromJSONObject(metricObj));
        }
        return response;
    }

}