| 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 | } |