content: /*
   * Copyright (C) 2010 A. Horn
   *
   * 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 org.mcsoxford.rss;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.HttpURLConnection;
  import java.net.URL;
  
  /**
   * HTTP client to retrieve and parse RSS 2.0 feeds. Callers must call
   * {@link RSSReader#close()} to release all resources.
   *
   * @author Mr Horn
   * @author Nick Felker (v1.1)
   *
   * @version 1.1 - Switch from Apache Http Client to Http Url Connection
   */
  public class RSSReader implements java.io.Closeable {
  
      /**
       * Thread-safe RSS parser SPI.
       */
      private final RSSParserSPI parser;
  
      /**
       * Instantiate a thread-safe HTTP client to retrieve RSS feeds.
       *
       * @param parser thread-safe RSS parser SPI implementation
       */
      public RSSReader(RSSParserSPI parser) {
          this.parser = parser;
      }
  
      /**
       * Instantiate a thread-safe HTTP client to retrieve RSS feeds. Internal memory
       * consumption and load performance can be tweaked with {@link RSSConfig}.
       *
       * @param config RSS configuration
       */
      public RSSReader(RSSConfig config) {
          this(new RSSParser(config));
      }
  
      /**
       * Instantiate a thread-safe HTTP client to retrieve and parse RSS feeds.
       * Default RSS configuration capacity values are used.
       */
      public RSSReader() {
          this(new RSSParser(new RSSConfig()));
      }
  
      /**
       * Send HTTP GET request and parse the XML response to construct an in-memory
       * representation of an RSS 2.0 feed.
       *
       * @param uri RSS 2.0 feed URI
       * @return in-memory representation of downloaded RSS feed
       * @throws RSSReaderException if RSS feed could not be retrieved because of
       *           HTTP error
       * @throws RSSFault if an unrecoverable IO error has occurred
       */
      public RSSFeed load(String uri) throws RSSReaderException {
          InputStream feedStream = null;
          try {
              URL url = new URL(uri);
              // Send GET request to URI
              HttpURLConnection conn = (HttpURLConnection) url.openConnection();
              conn.setRequestMethod("GET");
              conn.connect();
  
              // Check if server response is valid
              if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {
                  throw new RSSReaderException(conn.getResponseCode(),
                          conn.getResponseMessage());
              }
  
              // Extract content stream from HTTP response
              feedStream = conn.getInputStream();
              RSSFeed feed = parser.parse(feedStream);
  
              if (feed.getLink() == null) {
                  feed.setLink(android.net.Uri.parse(uri));
              }
  
              return feed;
          } catch (IOException e) {
              throw new RSSFault(e);
          } finally {
              Resources.closeQuietly(feedStream);
          }
      }
  
      /**
       * Release all HTTP client resources.
       */
      @Deprecated
      public void close() {
          // Don't need to close any HTTP clients.
      }
  
  }
  