Makes a method to check if a block is a sign

This will hopefully prevent any more mistakes related to checking if something is a sign or not.

src/main/java/net/knarcraft/paidsigns/listener/SignBreakListener.java

@@ -2,8 +2,8 @@ package net.knarcraft.paidsigns.listener;
 
 import net.knarcraft.paidsigns.PaidSigns;
 import net.knarcraft.paidsigns.manager.TrackedSignManager;
+import net.knarcraft.paidsigns.utility.SignHelper;
 import org.bukkit.block.Block;
-import org.bukkit.block.Sign;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
@@ -92,7 +92,7 @@ public class SignBreakListener implements Listener {
      * @param refund <p>Whether to perform a refund after un-tracking the sign</p>
      */
     private void removeTrackedSign(Block block, boolean refund) {
-        if (block.getState() instanceof Sign) {
+        if (SignHelper.isSign(block)) {
             try {
                 TrackedSignManager.removeTrackedSign(block.getLocation(), refund, false);
             } catch (IOException ignored) {

src/main/java/net/knarcraft/paidsigns/listener/SignListener.java

@@ -7,10 +7,10 @@ import net.knarcraft.paidsigns.container.PaidSignConditionMatch;
 import net.knarcraft.paidsigns.formatting.PaidSignsTranslatableMessage;
 import net.knarcraft.paidsigns.manager.EconomyManager;
 import net.knarcraft.paidsigns.manager.TrackedSignManager;
+import net.knarcraft.paidsigns.utility.SignHelper;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.block.Block;
-import org.bukkit.block.Sign;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
@@ -127,7 +127,7 @@ public class SignListener implements Listener {
             //Immediately refund if a plugin destroyed the sign within 5 ticks of the creation
             Bukkit.getScheduler().scheduleSyncDelayedTask(PaidSigns.getInstance(), () -> {
                 Block block = signLocation.getBlock();
-                if (!(block.getState() instanceof Sign)) {
+                if (!SignHelper.isSign(block)) {
                     try {
                         TrackedSignManager.removeTrackedSign(block.getLocation(), true, true);
                     } catch (IOException e) {

src/main/java/net/knarcraft/paidsigns/manager/TrackedSignManager.java

@@ -3,10 +3,10 @@ package net.knarcraft.paidsigns.manager;
 import net.knarcraft.paidsigns.PaidSigns;
 import net.knarcraft.paidsigns.container.TrackedSign;
 import net.knarcraft.paidsigns.formatting.PaidSignsTranslatableMessage;
+import net.knarcraft.paidsigns.utility.SignHelper;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.OfflinePlayer;
-import org.bukkit.block.Sign;
 import org.bukkit.configuration.ConfigurationSection;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.entity.Player;
@@ -110,7 +110,7 @@ public final class TrackedSignManager {
         TrackedSign trackedSign = new TrackedSign(playerId, cost);
 
         //Prevent destroyed signs from being tracked indefinitely
-        if (!(signLocation.getBlock().getState() instanceof Sign)) {
+        if (!SignHelper.isSign(signLocation.getBlock())) {
             Bukkit.getScheduler().scheduleSyncDelayedTask(PaidSigns.getInstance(), () -> {
                 PaidSigns.getInstance().getLogger().log(Level.WARNING, "The sign at " + signLocation +
                         " no longer exists. Removing from sign tracker. Refunding the player.");

src/main/java/net/knarcraft/paidsigns/utility/SignHelper.java

@@ -0,0 +1,25 @@
+package net.knarcraft.paidsigns.utility;
+
+import org.bukkit.block.Block;
+import org.bukkit.block.Sign;
+
+/**
+ * A helper class for dealing with signs
+ */
+public final class SignHelper {
+
+    private SignHelper() {
+
+    }
+
+    /**
+     * Checks whether the given block is a sign
+     *
+     * @param block <p>The block to check</p>
+     * @return <p>True if the block is a sign</p>
+     */
+    public static boolean isSign(Block block) {
+        return block.getState() instanceof Sign;
+    }
+
+}