From 0279bd0b97ae8353d4cfd114214cafd7e6f8f3ae Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Sun, 24 Feb 2013 15:52:15 +0100
Subject: [PATCH] Add filter for comic sites.

---
 .../rhynodge/filters/ComicSiteFilter.java          | 88 ++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/rhynodge/filters/ComicSiteFilter.java

diff --git a/src/main/java/net/pterodactylus/rhynodge/filters/ComicSiteFilter.java b/src/main/java/net/pterodactylus/rhynodge/filters/ComicSiteFilter.java
new file mode 100644
index 0000000..5f6a11e
--- /dev/null
+++ b/src/main/java/net/pterodactylus/rhynodge/filters/ComicSiteFilter.java
@@ -0,0 +1,88 @@
+/*
+ * rhynodge - ComicFilter.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.rhynodge.filters;
+
+import static com.google.common.base.Preconditions.*;
+
+import java.util.List;
+
+import net.pterodactylus.rhynodge.Filter;
+import net.pterodactylus.rhynodge.State;
+import net.pterodactylus.rhynodge.states.ComicState;
+import net.pterodactylus.rhynodge.states.ComicState.Comic;
+import net.pterodactylus.rhynodge.states.HtmlState;
+
+import com.google.common.base.Optional;
+import org.jsoup.nodes.Document;
+
+/**
+ * {@link Filter} implementation that can extract {@link ComicState}s from
+ * {@link HtmlState}s.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public abstract class ComicSiteFilter implements Filter {
+
+	@Override
+	public State filter(State state) {
+		checkArgument(state instanceof HtmlState, "state must be an HTML state");
+
+		/* initialize states: */
+		HtmlState htmlState = (HtmlState) state;
+		ComicState comicState = new ComicState();
+
+		/* extract comics. */
+		Optional<String> title = extractTitle(htmlState.document());
+		List<String> imageUrls = extractImageUrls(htmlState.document());
+
+		/* store comic, if found, into state. */
+		if (title.isPresent() && !imageUrls.isEmpty()) {
+			Comic comic = new Comic(title.get());
+			for (String imageUrl : imageUrls) {
+				comic.addImageUrl(imageUrl);
+			}
+		}
+
+		return comicState;
+	}
+
+	//
+	// PROTECTED METHODS
+	//
+
+	/**
+	 * Extracts the title of the comic from the given document.
+	 *
+	 * @param document
+	 * 		The document to extract the title from
+	 * @return The extracted title, or {@link Optional#absent()}} if no title could
+	 *         be found
+	 */
+	protected abstract Optional<String> extractTitle(Document document);
+
+	/**
+	 * Extracts the image URLs from the given document.
+	 *
+	 * @param document
+	 * 		The document to extract the image URLs from
+	 * @return The extracted image URLs, or an empty list if no URLs could be
+	 *         found
+	 */
+	protected abstract List<String> extractImageUrls(Document document);
+
+}
-- 
2.7.4