(Java) OneDrive -- List Large Directory

Demonstrates how to get the entire collection of DriveItem children when the collection is large and multiple pages need to be requested. To test this example, I created a DriveItem with 450 children.

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).

    // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.)
    http.put_AuthToken("MICROSOFT_GRAPH_ACCESS_TOKEN");

    // This example will get the DriveItems in /lots-of-files, which has 450 children..
    http.SetUrlVar("item_path","/lots-of-files");

    String resp;
    int i;
    int numItems;

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

    // This loop will download DriveItems in sets of 50 until no more exist.
    boolean bGetMore = true;
    // (Add the $top query parameter to define the page size, i.e. the max number of results to return).
    String nextLink = "https://graph.microsoft.com/v1.0/me/drive/root:{$item_path}:/children?$top=50";

    while ((bGetMore == true)) {

        // Get the next chunk of DriveItems
        resp = http.quickGetStr(nextLink);
        if (http.get_LastMethodSuccess() != true) {
            System.out.println(http.lastErrorText());
            return;
            }

        // The response should be JSON.
        json.Load(resp);

        // A successful response should return a status code of 200.
        if (http.get_LastStatus() != 200) {
            System.out.println(json.emit());
            System.out.println("Response status = " + http.get_LastStatus());
            return;
            }

        // Iterate over the DriveItems in the JSON response:
        i = 0;
        numItems = json.SizeOfArray("value");
        while (i < numItems) {
            json.put_I(i);
            System.out.println("name: " + json.stringOf("value[i].name"));
            i = i+1;
            }

        // If a nextLink was included in the JSON, use it to get the next set of 50 DriveItems.
        // Otherwise, exit the loop.
        if (json.HasMember("\"@odata.nextLink\"") == true) {
            nextLink = json.stringOf("\"@odata.nextLink\"");
            System.out.println("nextLink: " + nextLink);
            }
        else {
            bGetMore = false;
            }

        }
  }
}