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path: root/nms-patches/BlockPiston.patch
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--- a/net/minecraft/server/BlockPiston.java
+++ b/net/minecraft/server/BlockPiston.java
@@ -5,6 +5,18 @@
 import java.util.List;
 import javax.annotation.Nullable;
 
+// CraftBukkit start
+import java.util.AbstractList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.ListIterator;
+
+import com.google.common.collect.ImmutableList;
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.event.block.BlockPistonRetractEvent;
+import org.bukkit.event.block.BlockPistonExtendEvent;
+// CraftBukkit end
+
 public class BlockPiston extends BlockDirectional {
 
     public static final BlockStateBoolean EXTENDED = BlockStateBoolean.of("extended");
@@ -103,6 +115,18 @@
                 world.playBlockAction(blockposition, this, 0, enumdirection.a());
             }
         } else if (!flag && ((Boolean) iblockdata.get(BlockPiston.EXTENDED)).booleanValue()) {
+            // CraftBukkit start
+            if (!this.sticky) {
+                org.bukkit.block.Block block = world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
+                BlockPistonRetractEvent event = new BlockPistonRetractEvent(block, ImmutableList.<org.bukkit.block.Block>of(), CraftBlock.notchToBlockFace(enumdirection));
+                world.getServer().getPluginManager().callEvent(event);
+
+                if (event.isCancelled()) {
+                    return;
+                }
+            }
+            // PAIL: checkME - what happened to setTypeAndData?
+            // CraftBukkit end
             world.playBlockAction(blockposition, this, 1, enumdirection.a());
         }
 
@@ -193,7 +217,7 @@
                     }
                 }
 
-                if (!flag1 && iblockdata1.getMaterial() != Material.AIR && a(iblockdata1, world, blockposition1, enumdirection.opposite(), false, enumdirection) && (iblockdata1.o() == EnumPistonReaction.NORMAL || block == Blocks.PISTON || block == Blocks.STICKY_PISTON)) {
+                if (!flag1 && a(iblockdata1, world, blockposition1, enumdirection.opposite(), false, enumdirection) && (iblockdata1.o() == EnumPistonReaction.NORMAL || block == Blocks.PISTON || block == Blocks.STICKY_PISTON)) { // CraftBukkit - remove 'block.getMaterial() != Material.AIR' condition
                     this.a(world, blockposition, enumdirection, false);
                 }
             } else {
@@ -277,6 +301,48 @@
             int j = list.size() + list1.size();
             IBlockData[] aiblockdata = new IBlockData[j];
             EnumDirection enumdirection1 = flag ? enumdirection : enumdirection.opposite();
+            // CraftBukkit start
+            final org.bukkit.block.Block bblock = world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
+
+            final List<BlockPosition> moved = pistonextendschecker.getMovedBlocks();
+            final List<BlockPosition> broken = pistonextendschecker.getBrokenBlocks();
+
+            List<org.bukkit.block.Block> blocks = new AbstractList<org.bukkit.block.Block>() {
+
+                @Override
+                public int size() {
+                    return moved.size() + broken.size();
+                }
+
+                @Override
+                public org.bukkit.block.Block get(int index) {
+                    if (index >= size() || index < 0) {
+                        throw new ArrayIndexOutOfBoundsException(index);
+                    }
+                    BlockPosition pos = (BlockPosition) (index < moved.size() ? moved.get(index) : broken.get(index - moved.size()));
+                    return bblock.getWorld().getBlockAt(pos.getX(), pos.getY(), pos.getZ());
+                }
+            };
+            org.bukkit.event.block.BlockPistonEvent event;
+            if (flag) {
+                event = new BlockPistonExtendEvent(bblock, blocks, CraftBlock.notchToBlockFace(enumdirection1));
+            } else {
+                event = new BlockPistonRetractEvent(bblock, blocks, CraftBlock.notchToBlockFace(enumdirection1));
+            }
+            world.getServer().getPluginManager().callEvent(event);
+
+            if (event.isCancelled()) {
+                for (BlockPosition b : broken) {
+                    world.notify(b, Blocks.AIR.getBlockData(), world.getType(b), 3);
+                }
+                for (BlockPosition b : moved) {
+                    world.notify(b, Blocks.AIR.getBlockData(), world.getType(b), 3);
+                    b = b.shift(enumdirection1);
+                    world.notify(b, Blocks.AIR.getBlockData(), world.getType(b), 3);
+                }
+                return false;
+            }
+            // CraftBukkit end
 
             int k;
             BlockPosition blockposition2;