From 462f485591dc67d63d538de023b7a1b4851664b9 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 16:58:50 +0100
Subject: [PATCH] Add trigger for new comics.

---
 .../rhynodge/triggers/NewComicTrigger.java         | 128 +++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/rhynodge/triggers/NewComicTrigger.java

diff --git a/src/main/java/net/pterodactylus/rhynodge/triggers/NewComicTrigger.java b/src/main/java/net/pterodactylus/rhynodge/triggers/NewComicTrigger.java
new file mode 100644
index 0000000..c8852c7
--- /dev/null
+++ b/src/main/java/net/pterodactylus/rhynodge/triggers/NewComicTrigger.java
@@ -0,0 +1,128 @@
+/*
+ * rhynodge - NewComicTrigger.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.triggers;
+
+import static com.google.common.base.Preconditions.*;
+
+import java.util.List;
+
+import net.pterodactylus.rhynodge.Reaction;
+import net.pterodactylus.rhynodge.State;
+import net.pterodactylus.rhynodge.Trigger;
+import net.pterodactylus.rhynodge.output.DefaultOutput;
+import net.pterodactylus.rhynodge.output.Output;
+import net.pterodactylus.rhynodge.states.ComicState;
+import net.pterodactylus.rhynodge.states.ComicState.Comic;
+
+import com.google.common.collect.Lists;
+import org.apache.commons.lang3.StringEscapeUtils;
+
+/**
+ * {@link Trigger} implementation that detects the presence of new {@link
+ * Comic}s in a {@link ComicState}.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class NewComicTrigger implements Trigger {
+
+	/** The new comics. */
+	private final List<Comic> newComics = Lists.newArrayList();
+
+	@Override
+	public State mergeStates(State previousState, State currentState) {
+		checkArgument(previousState instanceof ComicState, "previous state must be a comic state");
+		checkArgument(currentState instanceof ComicState, "current state must be a comic state");
+
+		ComicState previousComicState = (ComicState) previousState;
+		ComicState currentComicState = (ComicState) currentState;
+
+		/* copy old state into new state. */
+		ComicState mergedComicState = new ComicState();
+		for (Comic comic : previousComicState) {
+			mergedComicState.add(comic);
+		}
+
+		newComics.clear();
+		for (Comic comic : currentComicState) {
+			if (!mergedComicState.comics().contains(comic)) {
+				newComics.add(comic);
+				mergedComicState.add(comic);
+			}
+		}
+
+		return mergedComicState;
+	}
+
+	@Override
+	public boolean triggers() {
+		return !newComics.isEmpty();
+	}
+
+	@Override
+	public Output output(Reaction reaction) {
+		DefaultOutput output = new DefaultOutput(String.format("New Comic found for “%s!”", reaction.name()));
+
+		output.addText("text/plain", generatePlainText());
+		output.addText("text/html", generateHtmlText());
+
+		return output;
+	}
+
+	//
+	// PRIVATE METHODS
+	//
+
+	/**
+	 * Generates a list of the new comics in plain text format.
+	 *
+	 * @return The list of new comics in plain text format
+	 */
+	private String generatePlainText() {
+		StringBuilder text = new StringBuilder();
+
+		for (Comic newComic : newComics) {
+			text.append("Comic Found: ").append(newComic.title()).append("\n\n");
+			for (String imageUrl : newComic) {
+				text.append("Image: ").append(imageUrl).append("\n");
+			}
+			text.append("\n\n");
+		}
+
+		return text.toString();
+	}
+
+	/**
+	 * Generates a list of new comics in HTML format.
+	 *
+	 * @return The list of new comics in HTML format
+	 */
+	private String generateHtmlText() {
+		StringBuilder html = new StringBuilder();
+		html.append("<body>");
+
+		for (Comic newComic : newComics) {
+			html.append("<h1>").append(StringEscapeUtils.escapeHtml4(newComic.title())).append("</h1>\n");
+			for (String imageUrl : newComic) {
+				html.append("<div><img src=\"").append(StringEscapeUtils.escapeHtml4(imageUrl)).append("\"></div>\n");
+			}
+		}
+
+		return html.append("</body>").toString();
+	}
+
+}
-- 
2.7.4