(Java) Page Through All Contacts

Demonstrates how to page through the entire list of Google Contacts.

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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.

    // --------------------------------------------------------------------------------------------------------
    // Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
    // Once connected, the REST object may be re-used for many REST API calls.
    // (It's a good idea to put the connection setup code in a separate function/subroutine.)
    // --------------------------------------------------------------------------------------------------------

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file 
    // saved by this example: Get Google Contacts OAuth2 Access Token

    CkJsonObject jsonToken = new CkJsonObject();
    boolean success = jsonToken.LoadFile("qa_data/tokens/googleContacts.json");
    if (success != true) {
        System.out.println("Failed to load googleContacts.json");
        return;
        }

    CkAuthGoogle gAuth = new CkAuthGoogle();
    gAuth.put_AccessToken(jsonToken.stringOf("access_token"));

    CkRest rest = new CkRest();

    // Connect using TLS.
    boolean bAutoReconnect = true;
    success = rest.Connect("www.google.com",443,true,bAutoReconnect);

    // Provide the authentication credentials (i.e. the access token)
    rest.SetAuthGoogle(gAuth);

    // ----------------------------------------------
    // OK, the REST connection setup is completed..
    // ----------------------------------------------

    int startIndex = 1;
    int maxResults = 25;
    // The totalResults will get updated with the correct value in the 1st loop iteration..
    int totalResults = 100;
    // To retrieve the contacts in pages of 25 each, we need to send the following for each page.

    // 	GET /m8/feeds/contacts/default/full?max-results=25&start-index=<startIndex>
    // 	GData-Version: 3.0

    CkStringBuilder sbMaxResults = new CkStringBuilder();
    sbMaxResults.AppendInt(maxResults);
    CkStringBuilder sbStartIndex = new CkStringBuilder();

    int loopIteration = 0;
    while (startIndex <= totalResults) {

        sbStartIndex.Clear();
        sbStartIndex.AppendInt(startIndex);

        rest.ClearAllHeaders();
        rest.ClearAllQueryParams();
        rest.AddHeader("GData-Version","3.0");
        rest.AddQueryParam("start-index",sbStartIndex.getAsString());
        rest.AddQueryParam("max-results",sbMaxResults.getAsString());

        CkStringBuilder sbResponseBody = new CkStringBuilder();
        success = rest.FullRequestNoBodySb("GET","/m8/feeds/contacts/default/full",sbResponseBody);
        if (success != true) {
            System.out.println(rest.lastErrorText());
            return;
            }

        // A successful response will have a status code equal to 200.
        if (rest.get_ResponseStatusCode() != 200) {
            System.out.println("response status code = " + rest.get_ResponseStatusCode());
            System.out.println("response status text = " + rest.responseStatusText());
            System.out.println("response header: " + rest.responseHeader());
            System.out.println("response body: " + sbResponseBody.getAsString());
            return;
            }

        // If the 200 response was received, then the contacts XML is contained
        // in the response body.
        CkXml xml = new CkXml();
        xml.LoadSb(sbResponseBody,false);

        // Now let's parse the XML...

        // Get the the total number of results, the start index, and the items per page.
        // We'll likely NOT get the full list, but will instead get the 1st page.
        totalResults = xml.GetChildIntValue("openSearch:totalResults");
        int startIndex2 = xml.GetChildIntValue("openSearch:startIndex");
        int itemsPerPage = xml.GetChildIntValue("openSearch:itemsPerPage");
        System.out.println("totalResults = " + totalResults);
        System.out.println("startIndex = " + startIndex2);
        System.out.println("itemsPerPage = " + itemsPerPage);

        // Iterate over each contact.
        int numEntries = xml.NumChildrenHavingTag("entry");
        int i = 0;
        while (i < numEntries) {
            xml.put_I(i);
            System.out.println((loopIteration * maxResults+i+1) + " ----");
            System.out.println("title: " + xml.getChildContent("entry[i]|title"));

            String idUrl = xml.getChildContent("entry[i]|id");
            System.out.println("id: " + idUrl);

            String fullName = xml.chilkatPath("entry[i]|gd:name|gd:fullName|*");
            if (xml.get_LastMethodSuccess() == true) {
                System.out.println("fullName: " + fullName);
                }

            String emailAddress = xml.chilkatPath("entry[i]|gd:email|(address)");
            if (xml.get_LastMethodSuccess() == true) {
                System.out.println("email address: " + emailAddress);
                }

            // Find the photo link and check to see if this contact has a photo.
            CkXml xLink = xml.GetChildWithAttr("link","rel","http://schemas.google.com/contacts/2008/rel#photo");
            if (xml.get_LastMethodSuccess() == true) {
                // Get the photo etag.
                boolean bHasPhoto = xLink.HasAttribute("gd:etag");
                if (bHasPhoto == true) {
                    System.out.println("This contact has a photo.");
                    }

                }

            i = i+1;
            }

        startIndex = startIndex+maxResults;
        loopIteration = loopIteration+1;
        }
  }
}