Java

BatchModify - Add a Label to each Message in Search Results

See more GMail REST API Examples

Searchs GMail for messages meeting a criteria and adds a label to each message found. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();
    http.put_AuthToken("GMAIL-ACCESS-TOKEN");

    String userId = "me";
    http.SetUrlVar("userId",userId);

    String query = "subject:questions";
    http.SetUrlVar("query",query);

    String url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages?q={$query}";

    CkStringBuilder sb = new CkStringBuilder();
    success = http.QuickGetSb(url,sb);
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    CkJsonObject json = new CkJsonObject();
    json.LoadSb(sb);
    json.put_EmitCompact(false);
    System.out.println(json.emit());

    if (http.get_LastStatus() != 200) {
        System.out.println("Failed.");
        return;
        }

    //  If successful, the received JSON looks like this:
    //  {
    //    "messages": [
    //      {
    //        "id": "166f583051d36144",
    //        "threadId": "166f583051d36144"
    //      },
    //      {
    //        "id": "166f5815e1f36144",
    //        "threadId": "166f5815e1f36144"
    //      },
    //  	...
    //      {
    //        "id": "166f580639e36144",
    //        "threadId": "166f580639e36144"
    //      },
    //      {
    //        "id": "15dbc2e28ec789c6",
    //        "threadId": "15dbc2e28ec789c6"
    //      }
    //    ],
    //    "nextPageToken": "13434766102274844688",
    //    "resultSizeEstimate": 103
    //  }
    //  

    //  Next, we'll be sending an HTTP POST to add the label "questions" to each message in the
    //  search results.  The JSON to be sent for the batchModify is this:

    //  	{
    //  	  "ids": [
    //  	    string
    //  	  ],
    //  	  "addLabelIds": [
    //  	    string
    //  	  ],
    //  	  "removeLabelIds": [
    //  	    string
    //  	  ]
    //  	}

    //  We'll omit "removeLabelIds" because we're not removing any labels.
    //  We are parsing the JSON search results, and at the same time building the batchModify JSON.

    CkJsonObject json2 = new CkJsonObject();

    int i = 0;
    int numMessages = json.SizeOfArray("messages");
    while ((i < numMessages)) {
        json.put_I(i);
        String id = json.stringOf("messages[i].id");
        json2.put_I(i);
        json2.UpdateString("ids[i]",id);
        i = i+1;
        }

    //  We need the id of the label (not the name).
    //  I know the name of the label is "questions", but I need to know the id.
    //  See this example: Get Label Id by Name
    //  The id of my label named "questions" is "Label_43"
    String labelId = "Label_43";
    json2.UpdateString("addLabelIds[0]",labelId);
    json2.UpdateNewArray("removeLabelIds");

    json2.put_EmitCompact(false);
    System.out.println(json2.emit());

    //  Send the batchModify
    url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages/batchModify";
    CkHttpResponse resp = new CkHttpResponse();
    success = http.HttpJson("POST",url,json2,"application/json",resp);
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    System.out.println("status = " + resp.get_StatusCode());

    //  A 204 response status indicate success.
    if (resp.get_StatusCode() != 204) {
        System.out.println(resp.bodyStr());
        System.out.println("Failed.");
        return;
        }

    //  The 204 response has an empty response body..

    System.out.println("BatchModify success!");
  }
}