Fix issue with tracking falling sand & gravel.

src/main/java/com/gmail/nossr50/mcMMO.java

@@ -9,6 +9,7 @@ import java.util.List;
 import net.shatteredlands.shatt.backup.ZipLibrary;
 
 import org.bukkit.OfflinePlayer;
+import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.PluginDescriptionFile;
 import org.bukkit.plugin.PluginManager;
@@ -96,6 +97,7 @@ public class mcMMO extends JavaPlugin {
 
     private HashMap<String, String> aliasMap = new HashMap<String, String>(); //Alias - Command
     private HashMap<Integer, String> tntTracker = new HashMap<Integer, String>();
+    private HashMap<Integer, Block> fallingBlockTracker = new HashMap<Integer, Block>();
 
     private static Database database;
     public static mcMMO p;
@@ -519,6 +521,44 @@ public class mcMMO extends JavaPlugin {
         tntTracker.remove(tntID);
     }
 
+    /**
+     * Add an ID value to the FallingBlock tracker.
+     *
+     * @param fallingBlockID The EntityID of the FallingBlock
+     */
+    public void addToFallingBlockTracker(int fallingBlockID, Block sourceBlock) {
+        fallingBlockTracker.put(fallingBlockID, sourceBlock);
+    }
+
+    /**
+     * Check to see if a given FallingBlock Entity is tracked.
+     *
+     * @param tntID The EntityID of the FallingBlock
+     * @return true if the FallingBlock is being tracked, false otherwise
+     */
+    public boolean fallingBlockIsTracked(int fallingBlockID) {
+        return fallingBlockTracker.containsKey(fallingBlockID);
+    }
+
+    /**
+     * Get the initial location of the FallingBlock.
+     *
+     * @param fallingBlockID The EntityID of the FallingBlock
+     * @return the Player who detonated it
+     */
+    public Block getSourceBlock(int fallingBlockID) {
+        return fallingBlockTracker.get(fallingBlockID);
+    }
+
+    /**
+     * Remove FallingBlock from the tracker after it lands.
+     *
+     * @param fallingBlockID The EntityID of the FallingBlock
+     */
+    public void removeFromFallingBlockTracker(int fallingBlockID) {
+        fallingBlockTracker.remove(fallingBlockID);
+    }
+
     public static String getMainDirectory() {
         return mainDirectory;
     }