Added RunContext parameter to Operation.resume().

src/main/java/com/sk89q/worldedit/extent/FastModeExtent.java

@@ -25,6 +25,7 @@ import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.blocks.BaseBlock;
 import com.sk89q.worldedit.function.operation.Operation;
+import com.sk89q.worldedit.function.operation.RunContext;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -94,7 +95,7 @@ public class FastModeExtent extends ExtentDelegate {
     protected Operation commitBefore() {
         return new Operation() {
             @Override
-            public Operation resume() throws WorldEditException {
+            public Operation resume(RunContext run) throws WorldEditException {
                 if (dirtyChunks.size() > 0) {
                     world.fixAfterFastMode(dirtyChunks);
                 }

src/main/java/com/sk89q/worldedit/extent/reorder/MultiStageReorder.java

@@ -32,6 +32,7 @@ import com.sk89q.worldedit.extent.ExtentDelegate;
 import com.sk89q.worldedit.function.operation.BlockMapEntryPlacer;
 import com.sk89q.worldedit.function.operation.Operation;
 import com.sk89q.worldedit.function.operation.OperationQueue;
+import com.sk89q.worldedit.function.operation.RunContext;
 import com.sk89q.worldedit.util.collection.TupleArrayList;
 
 import java.util.*;
@@ -122,7 +123,7 @@ public class MultiStageReorder extends ExtentDelegate implements ReorderingExten
     private class Stage3Committer implements Operation {
 
         @Override
-        public Operation resume() throws WorldEditException {
+        public Operation resume(RunContext run) throws WorldEditException {
             Extent extent = getExtent();
 
             final Set<BlockVector> blocks = new HashSet<BlockVector>();

src/main/java/com/sk89q/worldedit/function/operation/BlockMapEntryPlacer.java

@@ -52,7 +52,7 @@ public class BlockMapEntryPlacer implements Operation {
     }
 
     @Override
-    public Operation resume() throws WorldEditException {
+    public Operation resume(RunContext run) throws WorldEditException {
         while (iterator.hasNext()) {
             Map.Entry<BlockVector, BaseBlock> entry = iterator.next();
             extent.setBlock(entry.getKey(), entry.getValue());

src/main/java/com/sk89q/worldedit/function/operation/ChangeSetExecutor.java

@@ -62,7 +62,7 @@ public class ChangeSetExecutor implements Operation {
     }
 
     @Override
-    public Operation resume() throws WorldEditException {
+    public Operation resume(RunContext run) throws WorldEditException {
         while (iterator.hasNext()) {
             Change change = iterator.next();
             if (type == Type.UNDO) {

src/main/java/com/sk89q/worldedit/function/operation/DelegateOperation.java

@@ -46,8 +46,8 @@ public class DelegateOperation implements Operation {
     }
 
     @Override
-    public Operation resume() throws WorldEditException {
-        delegate = delegate.resume();
+    public Operation resume(RunContext run) throws WorldEditException {
+        delegate = delegate.resume(run);
         return delegate != null ? this : original;
     }
 

src/main/java/com/sk89q/worldedit/function/operation/ForwardExtentCopy.java

@@ -169,7 +169,7 @@ public class ForwardExtentCopy implements Operation {
     }
 
     @Override
-    public Operation resume() throws WorldEditException {
+    public Operation resume(RunContext run) throws WorldEditException {
         if (lastVisitor != null) {
             affected += lastVisitor.getAffected();
             lastVisitor = null;

src/main/java/com/sk89q/worldedit/function/operation/Operation.java

@@ -22,27 +22,30 @@ package com.sk89q.worldedit.function.operation;
 import com.sk89q.worldedit.WorldEditException;
 
 /**
- * An task that may be split into multiple steps to be run sequentially immediately
- * or at a varying or fixed interval. Operations should attempt to break apart tasks
- * into smaller tasks that can be completed in quicker successions.
+ * An task that may be split into multiple steps to be run sequentially
+ * immediately or at a varying or fixed interval. Operations should attempt
+ * to break apart tasks into smaller tasks that can be completed in quicker
+ * successions.
  */
 public interface Operation {
 
     /**
-     * Complete the next step. If this method returns true, then the method may be
-     * called again in the future, or possibly never. If this method returns false,
-     * then this method should not be called again.
+     * Complete the next step. If this method returns true, then the method may
+     * be called again in the future, or possibly never. If this method
+     * returns false, then this method should not be called again.
      *
+     * @param run describes information about the current run
      * @return another operation to run that operation again, or null to stop
      * @throws WorldEditException an error
      */
-    Operation resume() throws WorldEditException;
+    Operation resume(RunContext run) throws WorldEditException;
 
     /**
-     * Abort the current task. After the this method is called, {@link #resume()} should
-     * not be called at any point in the future. This method should not be called after
-     * successful completion of the operation. This method must be called if
-     * the operation is interrupted before completion.
+     * Abort the current task. After the this method is called,
+     * {@link #resume(RunContext)} should not be called at any point in the
+     * future. This method should not be called after successful completion of
+     * the operation. This method must be called if the operation is
+     * interrupted before completion.
      */
     void cancel();
 

src/main/java/com/sk89q/worldedit/function/operation/OperationQueue.java

@@ -76,13 +76,13 @@ public class OperationQueue implements Operation {
     }
 
     @Override
-    public Operation resume() throws WorldEditException {
+    public Operation resume(RunContext run) throws WorldEditException {
         if (current == null && queue.size() > 0) {
             current = queue.poll();
         }
 
         if (current != null) {
-            current = current.resume();
+            current = current.resume(run);
 
             if (current == null) {
                 current = queue.poll();

src/main/java/com/sk89q/worldedit/function/operation/Operations.java

@@ -38,7 +38,7 @@ public final class Operations {
      */
     public static void complete(Operation op) throws WorldEditException {
         while (op != null) {
-            op = op.resume();
+            op = op.resume(new RunContext());
         }
     }
 
@@ -52,7 +52,7 @@ public final class Operations {
     public static void completeLegacy(Operation op) throws MaxChangedBlocksException {
         while (op != null) {
             try {
-                op = op.resume();
+                op = op.resume(new RunContext());
             } catch (MaxChangedBlocksException e) {
                 throw e;
             } catch (WorldEditException e) {
@@ -71,7 +71,7 @@ public final class Operations {
     public static void completeBlindly(Operation op) {
         while (op != null) {
             try {
-                op = op.resume();
+                op = op.resume(new RunContext());
             } catch (WorldEditException e) {
                 throw new RuntimeException(e);
             }

src/main/java/com/sk89q/worldedit/function/operation/RunContext.java

@@ -0,0 +1,38 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.function.operation;
+
+/**
+ * Describes the current run.
+ */
+public class RunContext {
+
+    /**
+     * Return whether the current operation should still continue running.
+     * </p>
+     * This method can be called frequently.
+     *
+     * @return true if the operation should continue running
+     */
+    public boolean shouldContinue() {
+        return true;
+    }
+
+}

src/main/java/com/sk89q/worldedit/function/visitor/BreadthFirstSearch.java

@@ -24,6 +24,7 @@ import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.function.operation.Operation;
 import com.sk89q.worldedit.function.RegionFunction;
+import com.sk89q.worldedit.function.operation.RunContext;
 
 import java.util.*;
 
@@ -154,7 +155,7 @@ public abstract class BreadthFirstSearch implements Operation {
     }
 
     @Override
-    public Operation resume() throws WorldEditException {
+    public Operation resume(RunContext run) throws WorldEditException {
         Vector position;
         
         while ((position = queue.poll()) != null) {

src/main/java/com/sk89q/worldedit/function/visitor/FlatRegionVisitor.java

@@ -23,6 +23,7 @@ import com.sk89q.worldedit.Vector2D;
 import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.function.FlatRegionFunction;
 import com.sk89q.worldedit.function.operation.Operation;
+import com.sk89q.worldedit.function.operation.RunContext;
 import com.sk89q.worldedit.regions.FlatRegion;
 
 import static com.google.common.base.Preconditions.checkNotNull;
@@ -60,7 +61,7 @@ public class FlatRegionVisitor implements Operation {
     }
 
     @Override
-    public Operation resume() throws WorldEditException {
+    public Operation resume(RunContext run) throws WorldEditException {
         for (Vector2D pt : flatRegion.asFlatRegion()) {
             if (function.apply(pt)) {
                 affected++;

src/main/java/com/sk89q/worldedit/function/visitor/LayerVisitor.java

@@ -26,6 +26,7 @@ import com.sk89q.worldedit.function.LayerFunction;
 import com.sk89q.worldedit.function.mask.Mask2D;
 import com.sk89q.worldedit.function.mask.Masks;
 import com.sk89q.worldedit.function.operation.Operation;
+import com.sk89q.worldedit.function.operation.RunContext;
 import com.sk89q.worldedit.regions.FlatRegion;
 
 import static com.google.common.base.Preconditions.checkArgument;
@@ -88,7 +89,7 @@ public class LayerVisitor implements Operation {
     }
 
     @Override
-    public Operation resume() throws WorldEditException {
+    public Operation resume(RunContext run) throws WorldEditException {
         for (Vector2D column : flatRegion.asFlatRegion()) {
             if (!mask.test(column)) {
                 continue;

src/main/java/com/sk89q/worldedit/function/visitor/RegionVisitor.java

@@ -23,6 +23,7 @@ import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.function.operation.Operation;
 import com.sk89q.worldedit.function.RegionFunction;
+import com.sk89q.worldedit.function.operation.RunContext;
 import com.sk89q.worldedit.regions.Region;
 
 /**
@@ -49,7 +50,7 @@ public class RegionVisitor implements Operation {
     }
 
     @Override
-    public Operation resume() throws WorldEditException {
+    public Operation resume(RunContext run) throws WorldEditException {
         for (Vector pt : region) {
             if (function.apply(pt)) {
                 affected++;