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javaandroidjsondateddp

Cast Meteor.js DDP date to Java Date

I am using Android DDP Client library to connect my Android client to Meteor-JS server. When I receive a new object I use the following code to parse a "createdAt" field

private Map<String, Object> fields;
private Date timestamp;
/*...*/
timestamp = (Date) fields.get("createdAt");

I wrongfully assumed that it should be of Date type. And I get the exception with an error message:

com.google.gson.internal.LinkedHashTreeMap cannot be cast to java.util.Date

How to parse the Date sent by Meteor correctly?

Solution

  • Meteor-JS sends you a JSON.

    // The Date value in the JSON response is a Unix timestamp.
// It gives the number of milliseconds since 1 January 1970 00:00:00 UTC.
// So we can do:
Double jsonDate = ((Map<String, Double>) fields.get("createdAt")).get("$date");
timestamp = new Date(jsonDate.longValue());

    ps. I'd recommend to store timestamp as long field instead of Date.