Add //sel -d <type> to set a default region selector type.

src/main/java/com/sk89q/worldedit/LocalSession.java

@@ -38,6 +38,7 @@ import com.sk89q.worldedit.internal.cui.SelectionShapeEvent;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.regions.RegionSelector;
 import com.sk89q.worldedit.regions.selector.CuboidRegionSelector;
+import com.sk89q.worldedit.regions.selector.RegionSelectorType;
 import com.sk89q.worldedit.session.ClipboardHolder;
 import com.sk89q.worldedit.session.request.Request;
 import com.sk89q.worldedit.world.World;
@@ -85,6 +86,7 @@ public class LocalSession {
 
     // Saved properties
     private String lastScript;
+    private RegionSelectorType defaultSelector;
 
     /**
      * Construct the object.
@@ -114,6 +116,15 @@ public class LocalSession {
         this.config = config;
     }
 
+    /**
+     * Called on post load of the session from persistent storage.
+     */
+    public void postLoad() {
+        if (defaultSelector != null) {
+            this.selector = defaultSelector.createSelector();
+        }
+    }
+
     /**
      * Get whether this session is "dirty" and has changes that needs to
      * be committed.
@@ -260,6 +271,26 @@ public class LocalSession {
         return null;
     }
 
+    /**
+     * Get the default region selector.
+     *
+     * @return the default region selector
+     */
+    public RegionSelectorType getDefaultRegionSelector() {
+        return defaultSelector;
+    }
+
+    /**
+     * Set the default region selector.
+     *
+     * @param defaultSelector the default region selector
+     */
+    public void setDefaultRegionSelector(RegionSelectorType defaultSelector) {
+        checkNotNull(defaultSelector);
+        this.defaultSelector = defaultSelector;
+        setDirty();
+    }
+
     /**
      * @deprecated Use {@link #getRegionSelector(World)}
      */
@@ -277,15 +308,15 @@ public class LocalSession {
      */
     public RegionSelector getRegionSelector(World world) {
         checkNotNull(world);
-        if (selector.getIncompleteRegion().getWorld() == null) {
-            selector = new CuboidRegionSelector(world);
-        } else if (!selector.getIncompleteRegion().getWorld().equals(world)) {
-            selector.getIncompleteRegion().setWorld(world);
+        if (selector.getWorld() == null || !selector.getWorld().equals(world)) {
+            selector.setWorld(world);
             selector.clear();
         }
         return selector;
     }
 
+
+
     /**
      * @deprecated use {@link #getRegionSelector(World)}
      */
@@ -311,7 +342,7 @@ public class LocalSession {
     public void setRegionSelector(World world, RegionSelector selector) {
         checkNotNull(world);
         checkNotNull(selector);
-        selector.getIncompleteRegion().setWorld(world);
+        selector.setWorld(world);
         this.selector = selector;
     }
 

src/main/java/com/sk89q/worldedit/command/SelectionCommands.java

@@ -45,6 +45,7 @@ import com.sk89q.worldedit.regions.selector.CylinderRegionSelector;
 import com.sk89q.worldedit.regions.selector.EllipsoidRegionSelector;
 import com.sk89q.worldedit.regions.selector.ExtendingCuboidRegionSelector;
 import com.sk89q.worldedit.regions.selector.Polygonal2DRegionSelector;
+import com.sk89q.worldedit.regions.selector.RegionSelectorType;
 import com.sk89q.worldedit.regions.selector.SphereRegionSelector;
 import com.sk89q.worldedit.session.ClipboardHolder;
 import com.sk89q.worldedit.util.Countable;
@@ -709,13 +710,13 @@ public class SelectionCommands {
 
     @Command(
         aliases = { "/sel", ";", "/desel", "/deselect" },
+        flags = "d",
         usage = "[cuboid|extend|poly|ellipsoid|sphere|cyl|convex]",
         desc = "Choose a region selector",
         min = 0,
         max = 1
     )
     public void select(Player player, LocalSession session, EditSession editSession, CommandContext args) throws WorldEditException {
-
         final World world = player.getWorld();
         if (args.argsLength() == 0) {
             session.getRegionSelector(world).clear();
@@ -775,6 +776,23 @@ public class SelectionCommands {
             return;
         }
 
+        if (args.hasFlag('d')) {
+            RegionSelectorType found = null;
+            for (RegionSelectorType type : RegionSelectorType.values()) {
+                if (type.getSelectorClass() == selector.getClass()) {
+                    found = type;
+                    break;
+                }
+            }
+
+            if (found != null) {
+                session.setDefaultRegionSelector(found);
+                player.print("Your default region selector is now " + found.name() + ".");
+            } else {
+                throw new RuntimeException("Something unexpected happened. Please report this.");
+            }
+        }
+
         session.setRegionSelector(world, selector);
         session.dispatchCUISelection(player);
     }

src/main/java/com/sk89q/worldedit/regions/RegionSelector.java

@@ -25,7 +25,9 @@ import com.sk89q.worldedit.LocalSession;
 import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.extension.platform.Actor;
 import com.sk89q.worldedit.regions.selector.limit.SelectorLimits;
+import com.sk89q.worldedit.world.World;
 
+import javax.annotation.Nullable;
 import java.util.List;
 
 /**
@@ -35,6 +37,21 @@ import java.util.List;
  */
 public interface RegionSelector {
 
+    /**
+     * Get the world for the region selector.
+     *
+     * @return a world, which may be null
+     */
+    @Nullable
+    public World getWorld();
+
+    /**
+     * Set the world for the region selector.
+     *
+     * @param world the world, which may be null
+     */
+    public void setWorld(@Nullable World world);
+
     /**
      * Called when the first point is selected.
      * 

src/main/java/com/sk89q/worldedit/regions/selector/ConvexPolyhedralRegionSelector.java

@@ -50,8 +50,8 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 public class ConvexPolyhedralRegionSelector extends com.sk89q.worldedit.regions.ConvexPolyhedralRegionSelector implements RegionSelector, CUIRegion {
 
-    private final ConvexPolyhedralRegion region;
-    private BlockVector pos1;
+    private final transient ConvexPolyhedralRegion region;
+    private transient BlockVector pos1;
 
     /**
      * Create a new selector with a {@code null} world.
@@ -105,6 +105,17 @@ public class ConvexPolyhedralRegionSelector extends com.sk89q.worldedit.regions.
         }
     }
 
+    @Nullable
+    @Override
+    public World getWorld() {
+        return region.getWorld();
+    }
+
+    @Override
+    public void setWorld(@Nullable World world) {
+        region.setWorld(world);
+    }
+
     @Override
     public boolean selectPrimary(Vector position, SelectorLimits limits) {
         checkNotNull(position);

src/main/java/com/sk89q/worldedit/regions/selector/CuboidRegionSelector.java

@@ -40,9 +40,9 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 public class CuboidRegionSelector extends com.sk89q.worldedit.regions.CuboidRegionSelector implements RegionSelector, CUIRegion {
 
-    protected BlockVector position1;
-    protected BlockVector position2;
-    protected CuboidRegion region;
+    protected transient BlockVector position1;
+    protected transient BlockVector position2;
+    protected transient CuboidRegion region;
 
     /**
      * Create a new region selector with a {@code null} world.
@@ -106,6 +106,17 @@ public class CuboidRegionSelector extends com.sk89q.worldedit.regions.CuboidRegi
         region.setPos2(position2);
     }
 
+    @Nullable
+    @Override
+    public World getWorld() {
+        return region.getWorld();
+    }
+
+    @Override
+    public void setWorld(@Nullable World world) {
+        region.setWorld(world);
+    }
+
     @Override
     public boolean selectPrimary(Vector position, SelectorLimits limits) {
         checkNotNull(position);

src/main/java/com/sk89q/worldedit/regions/selector/CylinderRegionSelector.java

@@ -40,12 +40,12 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 public class CylinderRegionSelector extends com.sk89q.worldedit.regions.CylinderRegionSelector implements RegionSelector, CUIRegion {
 
-    protected CylinderRegion region;
-    protected static final NumberFormat format;
+    protected static transient final NumberFormat NUMBER_FORMAT;
+    protected transient CylinderRegion region;
 
     static {
-        format = (NumberFormat) NumberFormat.getInstance().clone();
-        format.setMaximumFractionDigits(3);
+        NUMBER_FORMAT = (NumberFormat) NumberFormat.getInstance().clone();
+        NUMBER_FORMAT.setMaximumFractionDigits(3);
     }
 
     /**
@@ -115,6 +115,17 @@ public class CylinderRegionSelector extends com.sk89q.worldedit.regions.Cylinder
         region.setMaximumY(Math.max(minY, maxY));
     }
 
+    @Nullable
+    @Override
+    public World getWorld() {
+        return region.getWorld();
+    }
+
+    @Override
+    public void setWorld(@Nullable World world) {
+        region.setWorld(world);
+    }
+
     @Override
     public boolean selectPrimary(Vector position, SelectorLimits limits) {
         if (!region.getCenter().equals(Vector.ZERO) && position.compareTo(region.getCenter()) == 0) {
@@ -156,7 +167,7 @@ public class CylinderRegionSelector extends com.sk89q.worldedit.regions.Cylinder
         Vector center = region.getCenter();
 
         if (!center.equals(Vector.ZERO)) {
-            player.print("Radius set to " + format.format(region.getRadius().getX()) + "/" + format.format(region.getRadius().getZ()) + " blocks. (" + region.getArea() + ").");
+            player.print("Radius set to " + NUMBER_FORMAT.format(region.getRadius().getX()) + "/" + NUMBER_FORMAT.format(region.getRadius().getZ()) + " blocks. (" + region.getArea() + ").");
         } else {
             player.printError("You must select the center point before setting the radius.");
             return;

src/main/java/com/sk89q/worldedit/regions/selector/EllipsoidRegionSelector.java

@@ -41,8 +41,8 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 public class EllipsoidRegionSelector extends com.sk89q.worldedit.regions.EllipsoidRegionSelector implements RegionSelector, CUIRegion {
 
-    protected EllipsoidRegion region;
-    protected boolean started = false;
+    protected transient EllipsoidRegion region;
+    protected transient boolean started = false;
 
     /**
      * Create a new selector with a {@code null} world.
@@ -102,6 +102,17 @@ public class EllipsoidRegionSelector extends com.sk89q.worldedit.regions.Ellipso
         region.setRadius(radius);
     }
 
+    @Nullable
+    @Override
+    public World getWorld() {
+        return region.getWorld();
+    }
+
+    @Override
+    public void setWorld(@Nullable World world) {
+        region.setWorld(world);
+    }
+
     @Override
     public boolean selectPrimary(Vector position, SelectorLimits limits) {
         if (position.equals(region.getCenter()) && region.getRadius().lengthSq() == 0) {

src/main/java/com/sk89q/worldedit/regions/selector/Polygonal2DRegionSelector.java

@@ -43,8 +43,8 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 public class Polygonal2DRegionSelector extends com.sk89q.worldedit.regions.Polygonal2DRegionSelector implements RegionSelector, CUIRegion {
 
-    private BlockVector pos1;
-    private Polygonal2DRegion region;
+    private transient BlockVector pos1;
+    private transient Polygonal2DRegion region;
 
     /**
      * Create a new selector with a {@code null} world.
@@ -117,6 +117,17 @@ public class Polygonal2DRegionSelector extends com.sk89q.worldedit.regions.Polyg
         region = new Polygonal2DRegion(world, points, minY, maxY);
     }
 
+    @Nullable
+    @Override
+    public World getWorld() {
+        return region.getWorld();
+    }
+
+    @Override
+    public void setWorld(@Nullable World world) {
+        region.setWorld(world);
+    }
+
     @Override
     public boolean selectPrimary(Vector position, SelectorLimits limits) {
         if (position.equals(pos1)) {

src/main/java/com/sk89q/worldedit/regions/selector/RegionSelectorType.java

@@ -0,0 +1,67 @@
+/*
+ * 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 Lesser 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 Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.regions.selector;
+
+import com.sk89q.worldedit.regions.RegionSelector;
+
+/**
+ * An enum of default region selector types.
+ */
+public enum RegionSelectorType {
+
+    CUBOID(CuboidRegionSelector.class),
+    EXTENDING_CUBOID(ExtendingCuboidRegionSelector.class),
+    CYLINDER(CylinderRegionSelector.class),
+    SPHERE(SphereRegionSelector.class),
+    ELLIPSOID(EllipsoidRegionSelector.class),
+    POLYGON(Polygonal2DRegionSelector.class),
+    CONVEX_POLYHEDRON(ConvexPolyhedralRegionSelector.class);
+
+    private final Class<? extends RegionSelector> selectorClass;
+
+    private RegionSelectorType(Class<? extends RegionSelector> selectorClass) {
+        this.selectorClass = selectorClass;
+    }
+
+    /**
+     * Get the selector class.
+     *
+     * @return a selector class
+     */
+    public Class<? extends RegionSelector> getSelectorClass() {
+        return selectorClass;
+    }
+
+    /**
+     * Create a new selector instance.
+     *
+     * @return a selector
+     */
+    public RegionSelector createSelector() {
+        try {
+            return getSelectorClass().newInstance();
+        } catch (InstantiationException e) {
+            throw new RuntimeException("Could not create selector", e);
+        } catch (IllegalAccessException e) {
+            throw new RuntimeException("Could not create selector", e);
+        }
+    }
+
+}

src/main/java/com/sk89q/worldedit/session/SessionManager.java

@@ -145,6 +145,7 @@ public class SessionManager {
         if (session == null) {
             try {
                 session = store.load(getKey(sessionKey));
+                session.postLoad();
             } catch (IOException e) {
                 log.log(Level.WARNING, "Failed to load saved session", e);
                 session = new LocalSession();