fixed buttons, plates

added yield to explosion
added event for chunk unloading

src/main/java/net/minecraft/server/BlockButton.java

@@ -167,7 +167,7 @@ public class BlockButton extends Block {
             if (j1 == 0) {
                 return true;
             } else {
-                //Allow the lever to change the current
+                //Allow the button to change the current
                 int old = (j1 != 8) ? 1 : 0;
                 int current = (j1 == 8) ? 1 : 0;
                 BlockRedstoneEvent eventRedstone = new BlockRedstoneEvent(block, old, current);
@@ -243,6 +243,14 @@ public class BlockButton extends Block {
             int l = world.getData(i, j, k);
 
             if ((l & 8) != 0) {
+                // Craftbukkit start
+                CraftWorld craftWorld = ((WorldServer) world).getWorld();
+                CraftServer server = ((WorldServer) world).getServer();
+                CraftBlock block = (CraftBlock) craftWorld.getBlockAt(i, j, k);
+                BlockRedstoneEvent eventRedstone = new BlockRedstoneEvent(block, 1, 0);
+                server.getPluginManager().callEvent(eventRedstone);
+                if(eventRedstone.getNewCurrent() > 0) return;
+                // Craftbukkit end
                 world.c(i, j, k, l & 7);
                 world.h(i, j, k, this.id);
                 int i1 = l & 7;

src/main/java/net/minecraft/server/BlockPressurePlate.java

@@ -4,7 +4,8 @@ import java.util.List;
 import java.util.Random;
 
 // CraftBukkit start
-import org.bukkit.block.BlockFace;import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.block.BlockFace;
+import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.CraftWorld;
 import org.bukkit.craftbukkit.block.CraftBlock;
 import org.bukkit.craftbukkit.entity.CraftLivingEntity;
@@ -115,6 +116,15 @@ public class BlockPressurePlate extends Block {
             flag1 = true;
         }
 
+        // Craftbukkit start
+        CraftWorld craftWorld = ((WorldServer) world).getWorld();
+        CraftServer server = ((WorldServer) world).getServer();
+        CraftBlock block = (CraftBlock) craftWorld.getBlockAt(i, j, k);
+        BlockRedstoneEvent eventRedstone = new BlockRedstoneEvent(block, flag ? 1 : 0, flag1 ? 1 : 0);
+        server.getPluginManager().callEvent(eventRedstone);
+        flag1 = eventRedstone.getNewCurrent() > 0;
+        // Craftbukkit end
+
         if (flag1 && !flag) {
             world.c(i, j, k, 1);
             world.h(i, j, k, this.id);

src/main/java/net/minecraft/server/ChunkProviderServer.java

@@ -10,15 +10,17 @@ import java.util.Set;
 
 // CraftBukkit start
 import org.bukkit.Location;
+import org.bukkit.Server;
 import org.bukkit.craftbukkit.CraftChunk;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Event.Type;
 import org.bukkit.event.world.ChunkLoadEvent;
+import org.bukkit.event.world.ChunkUnloadEvent;
 // CraftBukkit end
 
-public class ChunkProviderServer implements IChunkProvider {
+public class ChunkProviderServer implements IChunkProvider
-
+{
     public LongHashset a = new LongHashset(); // CraftBukkit
     private Chunk b;
     private IChunkProvider c;
@@ -197,17 +199,23 @@ public class ChunkProviderServer implements IChunkProvider {
     public boolean a() {
         if (!this.g.C) {
             // CraftBukkit start
+            Server server = g.getServer();
             while (!this.a.isEmpty()) {
                 long chunkcoordinates = this.a.popFirst();
                 Chunk chunk = e.get(chunkcoordinates);
-                if (chunk == null) continue;
+                if (chunk == null) {
+                    continue;
+                }
+                ChunkUnloadEvent cue = new ChunkUnloadEvent(Type.CHUNK_UNLOADED, chunk.bukkitChunk);
+                server.getPluginManager().callEvent(cue);
+                if (!cue.isCancelled()) {
                     chunk.e();
                     this.b(chunk);
                     this.a(chunk);
-                this.a.remove(chunkcoordinates);
                     this.e.remove(chunkcoordinates);
                     this.f.remove(chunk);
                 }
+            }
             // CraftBukkit end
 
             if (this.d != null) {

src/main/java/net/minecraft/server/Explosion.java

@@ -240,7 +240,7 @@ public class Explosion {
             }
 
             if (i1 > 0) {
-                Block.byId[i1].a(this.i, j, k, l, this.i.getData(j, k, l), 0.3F);
+                Block.byId[i1].a(this.i, j, k, l, this.i.getData(j, k, l), event.getYield()); //Modified by Craftbukkit
                 this.i.e(j, k, l, 0);
                 Block.byId[i1].a_(this.i, j, k, l);
             }