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+/* Copyright (c) 2008 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package sample.oauth;
+
+import com.google.gdata.client.GoogleService;
+import com.google.gdata.client.authn.oauth.GoogleOAuthHelper;
+import com.google.gdata.client.authn.oauth.GoogleOAuthParameters;
+import com.google.gdata.client.authn.oauth.OAuthHmacSha1Signer;
+import com.google.gdata.client.authn.oauth.OAuthSigner;
+import com.google.gdata.data.BaseEntry;
+import com.google.gdata.data.BaseFeed;
+import com.google.gdata.data.Feed;
+
+import java.net.URL;
+
+/**
+ * Sample application demonstrating how to do 2-Legged OAuth in the Google Data
+ * Java Client.  See the comments below to learn about the details.
+ *
+ * 
+ */
+public class TwoLeggedOAuthExample {
+
+  public static void main(String[] args) throws Exception {
+
+    ////////////////////////////////////////////////////////////////////////////
+    // STEP 1: Gather the user's information
+    ////////////////////////////////////////////////////////////////////////////
+
+    // This step collects information from the user, such as the consumer key
+    // and which service to query.  This is just a general setup routine, and
+    // the method by which you collect user information may be different in your
+    // implementation.
+    UserInputHelper inputController =
+        new TwoLeggedOAuthUserInputHelper();
+    UserInputVariables variables = inputController.getVariables();
+
+
+    ////////////////////////////////////////////////////////////////////////////
+    // STEP 2: Set up the OAuth objects
+    ////////////////////////////////////////////////////////////////////////////
+
+    // You first need to initialize a few OAuth-related objects.
+    // GoogleOAuthParameters holds all the parameters related to OAuth.
+    // OAuthSigner is responsible for signing the OAuth base string.
+    GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();
+
+    // Set your OAuth Consumer Key (which you can register at
+    // https://www.google.com/accounts/ManageDomains).
+    oauthParameters.setOAuthConsumerKey(variables.getConsumerKey());
+
+    // Initialize the OAuth Signer.  2-Legged OAuth must use HMAC-SHA1, which
+    // uses the OAuth Consumer Secret to sign the request.  The OAuth Consumer
+    // Secret can be obtained at https://www.google.com/accounts/ManageDomains.
+    oauthParameters.setOAuthConsumerSecret(variables.getSignatureKey());
+    OAuthSigner signer = new OAuthHmacSha1Signer();
+
+    // Finally create a new GoogleOAuthHelperObject.  This is the object you
+    // will use for all OAuth-related interaction.
+    GoogleOAuthHelper oauthHelper = new GoogleOAuthHelper(signer);
+
+
+    ////////////////////////////////////////////////////////////////////////////
+    // STEP 3: Make a request to Google
+    ////////////////////////////////////////////////////////////////////////////
+
+    // Set the scope for this particular service.
+    oauthParameters.setScope(variables.getScope());
+
+    // Append the "xoauth_requestor_id" parameter to the feed url.  This
+    // parameter indicates which user you are loading the data for.
+    String feedUrlString = variables.getFeedUrl();
+    feedUrlString += "?xoauth_requestor_id="
+        + variables.getVariable("xoauth_requestor_id");
+    URL feedUrl = new URL(feedUrlString);
+
+    System.out.println("Sending request to " + feedUrl.toString());
+    System.out.println();
+    GoogleService googleService =
+        new GoogleService(variables.getGoogleServiceName(),
+            "2-legged-oauth-sample-app");
+
+    // Set the OAuth credentials which were obtained from the steps above.
+    googleService.setOAuthCredentials(oauthParameters, signer);
+
+    // Make the request to Google
+    BaseFeed resultFeed = googleService.getFeed(feedUrl, Feed.class);
+    System.out.println("Response Data:");
+    System.out.println("=====================================================");
+    System.out.println("| TITLE: " + resultFeed.getTitle().getPlainText());
+    if (resultFeed.getEntries().size() == 0) {
+      System.out.println("|\tNo entries found.");
+    } else {
+      for (int i = 0; i < resultFeed.getEntries().size(); i++) {
+        BaseEntry entry = (BaseEntry) resultFeed.getEntries().get(i);
+        System.out.println("|\t" + (i + 1) + ": "
+            + entry.getTitle().getPlainText());
+      }
+    }
+    System.out.println("=====================================================");
+  }
+}