feat: save region selector to session store (#2621)

* feat: save region selector to session store
 - closes #2397

* Move new gson adapters to FAWE packages

worldedit-core/src/main/java/com/fastasyncworldedit/core/util/gson/ItemTypeAdapter.java

@@ -1,4 +1,4 @@
-package com.sk89q.worldedit.util.gson;
+package com.fastasyncworldedit.core.util.gson;
 
 import com.google.gson.JsonDeserializationContext;
 import com.google.gson.JsonDeserializer;

worldedit-core/src/main/java/com/fastasyncworldedit/core/util/gson/RegionSelectorAdapter.java

@@ -0,0 +1,33 @@
+package com.fastasyncworldedit.core.util.gson;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import com.sk89q.worldedit.regions.RegionSelector;
+import com.sk89q.worldedit.regions.selector.RegionSelectorType;
+
+import java.lang.reflect.Type;
+
+public class RegionSelectorAdapter implements JsonDeserializer<RegionSelector>, JsonSerializer<RegionSelector> {
+
+    @Override
+    public RegionSelector deserialize(JsonElement json, Type type, JsonDeserializationContext context) throws JsonParseException {
+        RegionSelectorType regionType = RegionSelectorType.valueOf(json.getAsString());
+        return regionType.createSelector();
+    }
+
+    @Override
+    public JsonElement serialize(RegionSelector selector, Type type, JsonSerializationContext context) {
+        RegionSelectorType regionType = RegionSelectorType.getForSelector(selector);
+        // Cannot nicely deserialize Fuzzy region type
+        if (regionType == null || regionType == RegionSelectorType.FUZZY) {
+            return null;
+        }
+        return new JsonPrimitive(regionType.toString());
+    }
+
+}

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

@@ -125,7 +125,9 @@ public class LocalSession implements TextureHolder {
     private transient int cuiVersion = CUI_VERSION_UNINITIALIZED;
 
     // Session related
-    private transient RegionSelector selector = new CuboidRegionSelector();
+    //FAWE start - allow saving to session store
+    private RegionSelector selector = new CuboidRegionSelector();
+    //FAWE end
     private transient boolean placeAtPos1 = false;
     //FAWE start
     private final transient List<Object> history = Collections.synchronizedList(new LinkedList<>() {
@@ -771,6 +773,7 @@ public class LocalSession implements TextureHolder {
         checkNotNull(selector);
         selector.setWorld(world);
         this.selector = selector;
+        setDirty();
         if (hasWorldOverride() && !world.equals(getWorldOverride())) {
             setWorldOverride(null);
         }

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

@@ -755,13 +755,7 @@ public class SelectionCommands {
         }
 
         if (setDefaultSelector) {
-            RegionSelectorType found = null;
-            for (RegionSelectorType type : RegionSelectorType.values()) {
-                if (type.getSelectorClass() == newSelector.getClass()) {
-                    found = type;
-                    break;
-                }
-            }
+            RegionSelectorType found = RegionSelectorType.getForSelector(newSelector);
 
             if (found != null) {
                 session.setDefaultRegionSelector(found);

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

@@ -19,8 +19,14 @@
 
 package com.sk89q.worldedit.regions.selector;
 
+import com.fastasyncworldedit.core.regions.selector.FuzzyRegionSelector;
+import com.fastasyncworldedit.core.regions.selector.PolyhedralRegionSelector;
 import com.sk89q.worldedit.regions.RegionSelector;
 
+import javax.annotation.Nullable;
+import java.util.HashMap;
+import java.util.Map;
+
 /**
  * An enum of default region selector types.
  */
@@ -32,7 +38,21 @@ public enum RegionSelectorType {
     SPHERE(SphereRegionSelector.class),
     ELLIPSOID(EllipsoidRegionSelector.class),
     POLYGON(Polygonal2DRegionSelector.class),
-    CONVEX_POLYHEDRON(ConvexPolyhedralRegionSelector.class);
+    CONVEX_POLYHEDRON(ConvexPolyhedralRegionSelector.class),
+    //FAWE start
+    POLYHEDRAL(PolyhedralRegionSelector.class),
+    FUZZY(FuzzyRegionSelector.class);
+    //FAWE end
+
+    //FAWE start
+    private static final Map<Class<? extends RegionSelector>, RegionSelectorType> VALUE_MAP = new HashMap<>();
+
+    static {
+        for (RegionSelectorType type : values()) {
+            VALUE_MAP.put(type.getSelectorClass(), type);
+        }
+    }
+    //FAWE end
 
     private final Class<? extends RegionSelector> selectorClass;
 
@@ -40,6 +60,19 @@ public enum RegionSelectorType {
         this.selectorClass = selectorClass;
     }
 
+    //FAWE start
+    /**
+     * Get a {@link RegionSelectorType} for the given {@link RegionSelector}
+     *
+     * @param selector Region selector to get type enum for
+     * @since TODO
+     */
+    @Nullable
+    public static RegionSelectorType getForSelector(RegionSelector selector) {
+        return VALUE_MAP.get(selector.getClass());
+    }
+    //FAWE end
+
     /**
      * Get the selector class.
      *

worldedit-core/src/main/java/com/sk89q/worldedit/util/gson/GsonUtil.java

@@ -19,12 +19,14 @@
 
 package com.sk89q.worldedit.util.gson;
 
+import com.fastasyncworldedit.core.util.gson.ItemTypeAdapter;
+import com.fastasyncworldedit.core.util.gson.RegionSelectorAdapter;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.math.Vector3;
+import com.sk89q.worldedit.regions.RegionSelector;
 import com.sk89q.worldedit.world.item.ItemType;
-import com.sk89q.worldedit.world.item.ItemTypes;
 
 /**
  * Utility methods for Google's GSON library.
@@ -43,7 +45,10 @@ public final class GsonUtil {
         GsonBuilder gsonBuilder = new GsonBuilder();
         gsonBuilder.registerTypeAdapter(Vector3.class, new VectorAdapter());
         gsonBuilder.registerTypeAdapter(BlockVector3.class, new BlockVectorAdapter());
+        //FAWE start
+        gsonBuilder.registerTypeAdapter(RegionSelector.class, new RegionSelectorAdapter());
         gsonBuilder.registerTypeAdapter(ItemType.class, new ItemTypeAdapter());
+        //FAWE end
         return gsonBuilder;
     }