From f18bc73cc517d841045c0a133a491c6020602cd9 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Thu, 26 Jul 2012 13:44:14 +0200
Subject: [PATCH] =?utf8?q?Add=20=E2=80=9Cdirty=E2=80=9D=20flag=20to=20prop?=
 =?utf8?q?erties.?=
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---
 .../demoscenemusic/data/Properties.java            | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/src/main/java/net/pterodactylus/demoscenemusic/data/Properties.java b/src/main/java/net/pterodactylus/demoscenemusic/data/Properties.java
index dfdb836..3b72223 100644
--- a/src/main/java/net/pterodactylus/demoscenemusic/data/Properties.java
+++ b/src/main/java/net/pterodactylus/demoscenemusic/data/Properties.java
@@ -33,6 +33,9 @@ public class Properties implements Iterable<Entry<String, String>> {
 	/** The properties. */
 	private final Map<String, String> properties = new HashMap<String, String>();
 
+	/** The “dirty” flag. */
+	private boolean dirty = false;
+
 	//
 	// ACCESSORS
 	//
@@ -59,6 +62,9 @@ public class Properties implements Iterable<Entry<String, String>> {
 	 * @return These properties
 	 */
 	public Properties set(String property, String value) {
+		if (!properties.containsKey(property) || (((value != null) && (!value.equals(properties.get(property))) || ((value == null) && (properties.get(property) != null))))) {
+			dirty = true;
+		}
 		properties.put(property, value);
 		return this;
 	}
@@ -71,6 +77,9 @@ public class Properties implements Iterable<Entry<String, String>> {
 	 * @return These properties
 	 */
 	public Properties remove(String property) {
+		if (properties.containsKey(property)) {
+			dirty = true;
+		}
 		properties.remove(property);
 		return this;
 	}
@@ -81,10 +90,34 @@ public class Properties implements Iterable<Entry<String, String>> {
 	 * @return These properties
 	 */
 	public Properties removeAll() {
+		if (!properties.isEmpty()) {
+			dirty = true;
+		}
 		properties.clear();
 		return this;
 	}
 
+	/**
+	 * Returns whether these properties have been modified.
+	 *
+	 * @return {@code true} if the properties have been modified since they were
+	 *         created or the last time {@link #resetDirty()} was called,
+	 *         {@code false} if they have not been modified
+	 */
+	public boolean isDirty() {
+		return dirty;
+	}
+
+	/**
+	 * Resets the dirty flag.
+	 *
+	 * @return These properties
+	 */
+	public Properties resetDirty() {
+		dirty = false;
+		return this;
+	}
+
 	//
 	// ITERABLE METHODS
 	//
-- 
2.7.4