Added SIGN_CHANGE event.

By: Timberjaw <timberjaw@gmail.com>

paper-api/src/main/java/org/bukkit/event/Event.java

@@ -330,6 +330,13 @@ public abstract class Event {
          */
         LEAVES_DECAY (Category.BLOCK),
 
+        /**
+         * Called when a sign is changed
+         *
+         * @see org.bukkit.event.block.SignChangeEvent
+         */
+        SIGN_CHANGE (Category.BLOCK),
+
         /**
          * Called when a liquid attempts to flow into a block which already
          * contains a "breakable" block, such as redstone wire

paper-api/src/main/java/org/bukkit/event/block/BlockListener.java

@@ -94,6 +94,14 @@ public class BlockListener implements Listener {
     public void onLeavesDecay(LeavesDecayEvent event) {
     }
 
+    /**
+     * Called when a sign is changed
+     *
+     * @param event Relevant event details
+     */
+    public void onSignChange(SignChangeEvent event) {
+    }
+
     /**
      * Called when a block is destroyed from burning
      *

paper-api/src/main/java/org/bukkit/event/block/SignChangeEvent.java

@@ -0,0 +1,70 @@
+package org.bukkit.event.block;
+
+import org.bukkit.block.Block;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+
+/**
+ * Called on sign change
+ */
+public class SignChangeEvent extends BlockEvent implements Cancellable {
+    private boolean cancel = false;
+    private Player player;
+    private String[] lines;
+
+    public SignChangeEvent(final Type type, final Block theBlock, final Player thePlayer, String[] theLines) {
+        super(type, theBlock);
+        this.player = thePlayer;
+        this.lines = theLines;
+    }
+
+    /**
+     * Gets all of the text lines from this event
+     *
+     * @return String[] of the event's text lines
+     */
+    public String[] getLines()
+    {
+        return lines;
+    }
+
+    /**
+     * Gets a single line from this event
+     *
+     * @param index index of the line to get
+     * @return String line
+     */
+    public String getLine(int index) throws IndexOutOfBoundsException {
+        return lines[index];
+    }
+
+    /**
+     * Sets a single line for this event
+     *
+     * @param index index of the line to set
+     * @param line text to set
+     */
+    public void setLine(int index, String line) throws IndexOutOfBoundsException {
+        lines[index] = line;
+    }
+
+    /**
+     * Gets the cancellation state of this event. A cancelled event will not
+     * be executed in the server, but will still pass to other plugins
+     *
+     * @return true if this event is cancelled
+     */
+    public boolean isCancelled() {
+        return cancel;
+    }
+
+    /**
+     * Sets the cancellation state of this event. A cancelled event will not
+     * be executed in the server, but will still pass to other plugins
+     *
+     * @param cancel true if you wish to cancel this event
+     */
+    public void setCancelled(boolean cancel) {
+        this.cancel = cancel;
+    }
+}

paper-api/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java

@@ -241,6 +241,11 @@ public final class JavaPluginLoader implements PluginLoader {
                     ((BlockListener)listener).onLeavesDecay( (LeavesDecayEvent)event );
                 }
             };
+        case SIGN_CHANGE:
+            return new EventExecutor() { public void execute( Listener listener, Event event ) {
+                    ((BlockListener)listener).onSignChange( (SignChangeEvent)event );
+                }
+            };
         case BLOCK_IGNITE:
             return new EventExecutor() { public void execute( Listener listener, Event event ) {
                     ((BlockListener)listener).onBlockIgnite( (BlockIgniteEvent)event );