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gdata/java/sample/codesearch/CodeSearchClient.java

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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.codesearch;
+
+import com.google.gdata.client.codesearch.CodeSearchService;
+
+import com.google.gdata.util.common.xml.XmlWriter;
+import com.google.gdata.data.codesearch.CodeSearchFeed;
+import com.google.gdata.data.codesearch.CodeSearchEntry;
+import com.google.gdata.data.codesearch.Match;
+
+
+import sample.util.SimpleCommandLineParser;
+
+import java.io.PrintStream;
+import java.io.PrintWriter;
+import java.net.URL;
+
+
+/**
+ * An application that serves as a sample to show how the CodeSearchService
+ * can be used to retrieve data from Google Code Search.
+ *
+ * 
+ */
+
+
+public class CodeSearchClient {
+  private static final String CODESEARCH_FEEDS_URL =
+    "https://www.google.com/codesearch/feeds/search?";
+
+  private CodeSearchService codesearchService;
+  private URL privateFeedUrl;
+
+  public CodeSearchClient(String query,  String nresults, String start)
+      throws Exception {
+    codesearchService = new CodeSearchService("gdata-sample-codesearch");
+    privateFeedUrl = new URL(CODESEARCH_FEEDS_URL + "q=" + query
+                             + "&start-index=" + start +
+                             "&max-results="+ nresults);
+  }
+
+  /**
+   * Driver for the sample.
+   *
+   * @param out outputStream to which to write status and messages
+   */
+
+  public void run(PrintStream out) throws Exception {
+    retrieveFeed(out);
+  }
+
+  /**
+   * Retrieves a query feed.
+   *
+   * @param out outputStream on which to write status info
+   * @throws Exception if error in retrieving feed
+   */
+  private void retrieveFeed(PrintStream out)
+      throws Exception {
+    PrintWriter writer = new PrintWriter(out);
+    XmlWriter xmlWriter = new XmlWriter(writer);
+    CodeSearchFeed myFeed =
+      codesearchService.getFeed(privateFeedUrl, CodeSearchFeed.class);
+    out.println("Retrieved feed: ");
+    out.println("Title: " + myFeed.getTitle().getPlainText());
+    out.println("Entries: " + myFeed.getEntries().size());
+    out.println("Updated: " + myFeed.getUpdated());
+    out.println("Start in: " + myFeed.getStartIndex());
+    out.println("Entries:");
+    for (CodeSearchEntry entry: myFeed.getEntries() ){
+      // Default Gdata elements
+      out.println("\tId: " + entry.getId());
+      out.println("\tTitle: " + entry.getTitle());
+      out.println("\tLink: " + entry.getHtmlLink().getHref());
+      out.println("\tUpdated: " + entry.getUpdated());
+      out.println("\tAuthor: " + entry.getAuthors().get(0).getName());
+      if (entry.getRights() != null)
+        out.println("\tLicense:" + entry.getRights().getPlainText());
+      // Codesearch Elements
+      out.println("\tPackage: ");
+      out.println("\t\t Name:" +
+                  entry.getPackage().getName());
+      out.println("\t\t URI:" +
+                  entry.getPackage().getUri());
+      entry.getPackage().generate(
+          xmlWriter,
+          codesearchService.getExtensionProfile());
+      out.println("XML: ");
+      writer.flush();
+      out.println("");
+      out.println("\tFile: " + entry.getFile().getName());
+      entry.getFile().generate(
+          xmlWriter,
+          codesearchService.getExtensionProfile());
+      out.println("XML: ");
+      writer.flush();
+      out.println("");
+      out.println("\tMatches: ");
+      for (Match m : entry.getMatches()) {
+        out.println(m.getLineNumber() + ": " +
+                    m.getLineText().getPlainText());
+        m.generate(
+            xmlWriter,
+            codesearchService.getExtensionProfile());
+        out.println("XML: ");
+        writer.flush();
+        out.println("");
+      }
+    }
+  }
+
+  /**
+   * Main entry point.  Parses arguments and creates and invokes the
+   * CodeSearchClient.
+   */
+  public static void main(String[] arg)
+      throws Exception {
+    SimpleCommandLineParser parser = new SimpleCommandLineParser(arg);
+    String query = parser.getValue("query", "query", "q");
+    String nresults = parser.getValue("nresults", "nresults", "nr");
+    String start = parser.getValue("start", "index", "start");
+
+    boolean help = parser.containsKey("help", "h");
+    if (help || (query == null)) {
+      usage();
+      System.exit(1);
+    }
+
+    CodeSearchClient client = new CodeSearchClient(query, nresults, start);
+    client.run(System.out);
+  }
+
+  /**
+   * Prints usage of this application.
+   */
+  private static void usage() {
+    System.out.println(
+        "Usage: java CodeSearchClient --query query_regex [--nresults number_of_results]"
+        + " [--start start_index] ");
+    System.out.println(
+        "\nA simple application that uses the provided query\n" +
+        "and returns the results provided by the Google CodeSearch Service\n");
+  }
+}