com.telekom.m2m.cot.restsdk.measurement.MeasurementCollection Maven / Gradle / Ivy
package com.telekom.m2m.cot.restsdk.measurement;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.telekom.m2m.cot.restsdk.CloudOfThingsRestClient;
import com.telekom.m2m.cot.restsdk.util.ExtensibleObject;
import com.telekom.m2m.cot.restsdk.util.Filter;
import com.telekom.m2m.cot.restsdk.util.JsonArrayPagination;
/**
* Represents a pageable Measurement collection.
*
* Collection can be scrolled with next() and prev().
*
*
* @since 0.1.0
* Created by Patrick Steinert on 14.02.16.
*/
public class MeasurementCollection extends JsonArrayPagination {
private static final String COLLECTION_CONTENT_TYPE = "application/vnd.com.nsn.cumulocity.measurementCollection+json;charset=UTF-8;ver=0.9";
private static final String COLLECTION_ELEMENT_NAME = "measurements";
/**
* Internal contstructor to create an MeasurementCollection.
* Use {@link MeasurementApi} to get MeasurementCollection.
*
* @param cloudOfThingsRestClient the necessary REST client to send requests to the CoT.
* @param relativeApiUrl relative url of the REST API without leading slash.
* @param gson the necessary json De-/serializer.
* @param filterBuilder the build criteria or null if all items should be retrieved.
* @param pageSize max number of retrieved elements per page.
*/
MeasurementCollection(final CloudOfThingsRestClient cloudOfThingsRestClient,
final String relativeApiUrl,
final Gson gson,
final Filter.FilterBuilder filterBuilder,
final int pageSize) {
super(cloudOfThingsRestClient, relativeApiUrl, gson, COLLECTION_CONTENT_TYPE, COLLECTION_ELEMENT_NAME, filterBuilder, pageSize);
}
/**
* Retrieves the current page.
*
* Retrieves the Measurements influenced by filters set in construction.
*
* @return array of found Measurements
*/
public Measurement[] getMeasurements() {
final JsonArray jsonMeasurements = getJsonArray();
if (jsonMeasurements != null) {
final Measurement[] arrayOfMeasurements = new Measurement[jsonMeasurements.size()];
for (int i = 0; i < jsonMeasurements.size(); i++) {
JsonElement jsonMeasurement = jsonMeasurements.get(i).getAsJsonObject();
final Measurement measurement = new Measurement(gson.fromJson(jsonMeasurement, ExtensibleObject.class));
arrayOfMeasurements[i] = measurement;
}
return arrayOfMeasurements;
} else {
return new Measurement[0];
}
}
}