Adding Jab Archives ripper

This currently only supports ripping bottom-level folders. If a folder you rip contains another folder, that subfolder will not be fully ripped, only the source image from its thumbnail will be included in the rip.

src/main/java/com/rarchives/ripme/ripper/rippers/JabArchivesRipper.java

@@ -0,0 +1,78 @@
+package com.rarchives.ripme.ripper.rippers;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.rarchives.ripme.ripper.AbstractHTMLRipper;
+import com.rarchives.ripme.utils.Http;
+
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
+
+public class JabArchivesRipper extends AbstractHTMLRipper {
+
+    public JabArchivesRipper(URL url) throws IOException {
+        super(url);
+    }
+
+    @Override
+    public String getHost() {
+        return "jabarchives";
+    }
+
+    @Override
+    public String getDomain() {
+        return "jabarchives.com";
+    }
+
+    @Override
+    public String getGID(URL url) throws MalformedURLException {
+        Pattern p = Pattern.compile("^https?://jabarchives.com/main/view/([a-zA-Z0-9_]+).*$");
+        Matcher m = p.matcher(url.toExternalForm());
+        if (m.matches()) {
+            // Return the text contained between () in the regex
+            return m.group(1);
+        }
+        throw new MalformedURLException(
+                "Expected javarchives.com URL format: " +
+                "jabarchives.com/main/view/albumname - got " + url + " instead");
+    }
+
+    @Override
+    public Document getFirstPage() throws IOException {
+        // "url" is an instance field of the superclass
+        return Http.url(url).get();
+    }
+
+    @Override
+    public Document getNextPage(Document doc) throws IOException {
+        // Find next page
+        Elements hrefs = doc.select("a[title=\"Next page\"]");
+        if (hrefs.isEmpty()) {
+            throw new IOException("No more pages");
+        }
+        String nextUrl = "http://jabarchives.com" + hrefs.first().attr("href");
+        sleep(500);
+        return Http.url(nextUrl).get();
+    }
+
+    @Override
+    public List<String> getURLsFromPage(Document doc) {
+        List<String> result = new ArrayList<String>();
+        for (Element el : doc.select("#contentMain img")) {
+            result.add("http://jabarchives.com" + el.attr("src").replace("thumb", "large"));
+        }
+        return result;
+    }
+
+    @Override
+    public void downloadURL(URL url, int index) {
+        addURLToDownload(url, getPrefix(index));
+    }
+}