(Java) Find Contact Having Email Address

Demonstrates how to fetch the Google Contact for a given email address.

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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..
    // ----------------------------------------------

    // To retrieve the contacts, we need to send the following:

    // 	GET /m8/feeds/contacts/default/full?q=<emailAddress>
    // 	GData-Version: 3.0

    // Get the contact (or contacts) with this email address:
    String emailAddressToFind = "admin@chilkatsoft.com";

    rest.AddHeader("GData-Version","3.0");
    rest.AddQueryParam("q",emailAddressToFind);

    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);

    // See below for a sample response body.
    xml.SaveXml("qa_output/google_contacts.xml");

    // 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.
    int totalResults = xml.GetChildIntValue("openSearch:totalResults");
    int startIndex = xml.GetChildIntValue("openSearch:startIndex");
    int itemsPerPage = xml.GetChildIntValue("openSearch:itemsPerPage");
    System.out.println("totalResults = " + totalResults);
    System.out.println("startIndex = " + startIndex);
    System.out.println("itemsPerPage = " + itemsPerPage);

    // We'll borrow a method from FileAccess to get the contactId from the URL string (see the code in the while loop)
    CkFileAccess fac = new CkFileAccess();

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

        // The entry "id" child contains a URL having this format:
        // <id>http://www.google.com/m8/feeds/contacts/{userEmail}/base/{contactId}</id>
        // Let's get the URL and parse the contactId from it..
        String idUrl = xml.getChildContent("entry[i]|id");
        System.out.println("id: " + idUrl);

        // Use the parsing ability of GetFileName to get the contactId
        String contactId = fac.getFileName(idUrl);
        System.out.println("contactId: " + contactId);

        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);
            }

        i = i+1;
        }
  }
}