Broke up EditSession into many Extents.

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

@@ -0,0 +1,58 @@
+/*
+ * 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.visitor;
+
+import com.sk89q.worldedit.BlockVector;
+import com.sk89q.worldedit.WorldEditException;
+import com.sk89q.worldedit.blocks.BaseBlock;
+import com.sk89q.worldedit.extent.Extent;
+import com.sk89q.worldedit.function.operation.Operation;
+
+import java.util.Iterator;
+import java.util.Map;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+public class BlockMapEntryVisitor implements Operation {
+
+    private final Extent extent;
+    private final Iterator<Map.Entry<BlockVector, BaseBlock>> iterator;
+
+    public BlockMapEntryVisitor(Extent extent, Iterator<Map.Entry<BlockVector, BaseBlock>> iterator) {
+        checkNotNull(extent);
+        checkNotNull(iterator);
+        this.extent = extent;
+        this.iterator = iterator;
+    }
+
+    @Override
+    public Operation resume() throws WorldEditException {
+        while (iterator.hasNext()) {
+            Map.Entry<BlockVector, BaseBlock> entry = iterator.next();
+            extent.setBlock(entry.getKey(), entry.getValue(), true);
+        }
+
+        return null;
+    }
+
+    @Override
+    public void cancel() {
+    }
+}