From 5e30da746a4bf60db229bded083bc0d24efa5c13 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Sat, 1 Jan 2011 14:31:53 +0100
Subject: [PATCH] Add Fingerprintable interface.

---
 .../pterodactylus/sone/data/Fingerprintable.java   | 36 ++++++++++++++++++++++
 .../java/net/pterodactylus/sone/data/Sone.java     | 14 ++++-----
 2 files changed, 43 insertions(+), 7 deletions(-)
 create mode 100644 src/main/java/net/pterodactylus/sone/data/Fingerprintable.java

diff --git a/src/main/java/net/pterodactylus/sone/data/Fingerprintable.java b/src/main/java/net/pterodactylus/sone/data/Fingerprintable.java
new file mode 100644
index 0000000..013e0b3
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sone/data/Fingerprintable.java
@@ -0,0 +1,36 @@
+/*
+ * Sone - Fingerprintable.java - Copyright © 2011 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.sone.data;
+
+/**
+ * Interface for objects that can create a fingerprint of themselves, e.g. to
+ * detect modifications. The fingerprint should only contain original
+ * information; derived information should not be included.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public interface Fingerprintable {
+
+	/**
+	 * Returns the fingerprint of this object.
+	 *
+	 * @return The fingerprint of this object
+	 */
+	public String getFingerprint();
+
+}
diff --git a/src/main/java/net/pterodactylus/sone/data/Sone.java b/src/main/java/net/pterodactylus/sone/data/Sone.java
index 7d4f7ef..c145b82 100644
--- a/src/main/java/net/pterodactylus/sone/data/Sone.java
+++ b/src/main/java/net/pterodactylus/sone/data/Sone.java
@@ -40,7 +40,7 @@ import freenet.keys.FreenetURI;
  *
  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  */
-public class Sone {
+public class Sone implements Fingerprintable {
 
 	/** comparator that sorts Sones by their nice name. */
 	public static final Comparator<Sone> NICE_NAME_COMPARATOR = new Comparator<Sone>() {
@@ -580,14 +580,14 @@ public class Sone {
 		return this;
 	}
 
+	//
+	// FINGERPRINTABLE METHODS
+	//
+
 	/**
-	 * Returns a fingerprint of this Sone. The fingerprint only depends on data
-	 * that is actually stored when a Sone is inserted. The fingerprint can be
-	 * used to detect changes in Sone data and can also be used to detect if
-	 * previous changes are reverted.
-	 *
-	 * @return The fingerprint of this Sone
+	 * {@inheritDoc}
 	 */
+	@Override
 	public synchronized String getFingerprint() {
 		StringBuilder fingerprint = new StringBuilder();
 		fingerprint.append("Profile(");
-- 
2.7.4