(Java) Outlook -- Get Number of Emails

Gets the number of emails in an Outlook folder. This uses the OData $count system query option. See OData System Query Option $count for general information.

This example first gets the combined total number of messages across all folders.

Note: This example requires Chilkat v9.5.0.68 or greater.

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

    CkHttp http = new CkHttp();

    // Use your previously obtained access token here:
    // See the following examples for getting an access token:
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
    //    Refresh Access Token (Azure AD v2.0 Endpoint).
    //    Refresh Access Token (Azure AD Endpoint).

    http.put_AuthToken("MICROSOFT_GRAPH_ACCESS_TOKEN");

    CkStringBuilder sbResponse = new CkStringBuilder();

    // This gets the combined total number of emails in all folders.
    boolean success = http.QuickGetSb("https://graph.microsoft.com/v1.0/me/messages/$count",sbResponse);
    if ((success != true) && (http.get_LastStatus() == 0)) {
        System.out.println(http.lastErrorText());
        return;
        }

    CkJsonObject json = new CkJsonObject();
    json.put_EmitCompact(false);

    // If the status code was not 200, then it failed and the response is likely JSON:
    if (http.get_LastStatus() != 200) {
        System.out.println("Status code = " + http.get_LastStatus());
        json.LoadSb(sbResponse);
        System.out.println(json.emit());
        System.out.println("Failed.");
        return;
        }

    // A success response payload contains just the integer value (it is not JSON)
    System.out.println("Combined Total Number of Emails = " + sbResponse.getAsString());
    System.out.println("--");

    // ---------------------------------------------------------------------------
    // To get the number of emails in a particular folder, we need to use the folder id.
    // 

    // In this example, we'd like to get number of messages in the folder "/Inbox/abc",
    // but we must specify the corresponding folder_id.  The best way to do this is to create
    // a local map of folderPaths-to-folderIds.
    // We'll use the map created by this example:  Create Outlook Folder Map)
    CkHashtable htFolderMap = new CkHashtable();
    CkStringBuilder sbMap = new CkStringBuilder();
    sbMap.LoadFile("qa_data/outlook/folderMap.xml","utf-8");
    htFolderMap.AddFromXmlSb(sbMap);

    // Get the ID for the "/Inbox/abc" folder:
    String folderId = htFolderMap.lookupStr("/Inbox/abc");
    if (htFolderMap.get_LastMethodSuccess() != true) {
        System.out.println("Folder ID not found");
        return;
        }

    http.SetUrlVar("folder_id",folderId);

    // Send the request get the folder information.
    // In this case we are NOT using the $count system query option.
    success = http.QuickGetSb("https://graph.microsoft.com/v1.0/me/mailFolders/{$folder_id}",sbResponse);
    if ((success != true) && (http.get_LastStatus() == 0)) {
        System.out.println(http.lastErrorText());
        return;
        }

    json.LoadSb(sbResponse);
    System.out.println(json.emit());
    System.out.println("--");

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

    // The successful JSON response looks like this;

    // 	{
    // 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('me')/mailFolders/$entity",
    // 	  "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAAA=",
    // 	  "displayName": "abc",
    // 	  "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA",
    // 	  "childFolderCount": 2,
    // 	  "unreadItemCount": 0,
    // 	  "totalItemCount": 3
    // 	}
    // 

    // Get the integer value from the JSON like this:
    int totalItemCount = json.IntOf("totalItemCount");
    System.out.println("totalItemCount = " + totalItemCount);

    int childFolderCount = json.IntOf("childFolderCount");
    System.out.println("childFolderCount = " + childFolderCount);

    // etc..
  }
}