src/be/nikiroo/gofetch/support/BasicSupport.java

   1 package be.nikiroo.gofetch.support;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5 import java.net.URL;
   6 import java.net.URLConnection;
   7 import java.util.List;
   8 import java.util.zip.GZIPInputStream;
   9
  10 import be.nikiroo.gofetch.data.Story;
  11
  12 public abstract class BasicSupport {
  13         public enum Type {
  14                 SLASHDOT, PIPEDOT, LWN,
  15         }
  16
  17         static private String preselector;
  18
  19         private Type type;
  20
  21         abstract public List<Story> list() throws IOException;
  22
  23         /**
  24          * Fetch the full article content as well as all the comments associated to
  25          * this {@link Story}, if any (can be empty, but not NULL).
  26          *
  27          * @param story
  28          *            the story to fetch the comments of
  29          *
  30          * @throws IOException
  31          *             in case of I/O error
  32          */
  33         abstract public void fetch(Story story) throws IOException;
  34
  35         abstract public String getDescription();
  36
  37         public String getSelector() {
  38                 return getSelector(type);
  39         }
  40
  41         public Type getType() {
  42                 return type;
  43         }
  44
  45         protected void setType(Type type) {
  46                 this.type = type;
  47         }
  48
  49         /**
  50          * @param preselector
  51          *            the preselector to set
  52          */
  53         static public void setPreselector(String preselector) {
  54                 BasicSupport.preselector = preselector;
  55         }
  56
  57         static public BasicSupport getSupport(Type type) {
  58                 BasicSupport support = null;
  59
  60                 if (type != null) {
  61                         switch (type) {
  62                         case SLASHDOT:
  63                                 support = new Slashdot();
  64                                 break;
  65                         case PIPEDOT:
  66                                 support = new Pipedot();
  67                                 break;
  68                         case LWN:
  69                                 support = new LWN();
  70                                 break;
  71                         }
  72
  73                         if (support != null) {
  74                                 support.setType(type);
  75                         }
  76                 }
  77
  78                 return support;
  79         }
  80
  81         static public String getSelector(Type type) {
  82                 return preselector + "/" + type + "/";
  83         }
  84
  85         // TODO: check Downloader.java?
  86         static protected InputStream open(URL url) throws IOException {
  87                 URLConnection conn = url.openConnection();
  88                 conn.connect();
  89                 InputStream in = conn.getInputStream();
  90                 if ("gzip".equals(conn.getContentEncoding())) {
  91                         in = new GZIPInputStream(in);
  92                 }
  93
  94                 return in;
  95         }
  96 }