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2011-10-26 09:44:02 +02:00
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+/* Copyright (c) 2006 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.gbase.cmdline;
+
+import com.google.api.gbase.client.GoogleBaseEntry;
+import com.google.api.gbase.client.GoogleBaseFeed;
+import com.google.api.gbase.client.GoogleBaseQuery;
+import com.google.gdata.util.ServiceException;
+
+import java.io.IOException;
+
+
+/**
+ * This class demonstrates how to send simple Google Base search queries
+ * using the client library of the Google Base data API.
+ *
+ * The tool implemented by this class will connect to Google Base, run the
+ * query and display some results.
+ */
+public class QueryExample extends Example {
+
+  /**
+   * Maximum number of results to return.
+   */
+  private static final int MAX_RESULTS = 10;
+
+  /**
+   * Runs the example.
+   */
+  public static void main(String[] args) throws IOException, ServiceException {
+    String queryString = null;
+    
+    args = init(args, "Google-QueryExample-1.0");
+
+    // Process command-line arguments
+    if (args.length == 1) {
+      queryString = args[0];
+    } else {
+      System.err.println("Invalid argument count.");
+      System.err.println("Expected one argument:");
+      System.err.println(" query");
+      System.exit(1);
+    }
+    
+    // Create a query URL from the given arguments
+    GoogleBaseQuery query =
+        new GoogleBaseQuery(urlFactory.getSnippetsFeedURL());
+    query.setGoogleBaseQuery(queryString);
+    query.setResultFormat(GoogleBaseQuery.ResultFormat.ATOM);
+    query.setMaxResults(MAX_RESULTS);
+
+    // Display the URL generated by the API
+    System.out.println("Sending request to: " + query.getUrl());
+
+    try {
+      GoogleBaseFeed feed = service.query(query, GoogleBaseFeed.class);
+      // Print the items
+      printResult(feed);
+    } catch (ServiceException e) {
+      printServiceException(e);
+    }
+  }
+
+  /**
+   * Prints a few relevant attributes from each item in the feed to the output.
+   *
+   * @param feed a Google Base data API items feed
+   */
+  private static void printResult(GoogleBaseFeed feed) {
+    if (feed.getTotalResults() == 0) {
+      System.out.println("No matches.");
+    } else {
+      for (GoogleBaseEntry entry : feed.getEntries()) {
+        System.out.println(entry.getGoogleBaseAttributes().getItemType() +
+                           ": " + entry.getTitle().getPlainText() +
+                           " - " +entry.getId());
+      }
+    }
+  }
+}