Add Region loading to DynamicRegionSystem

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/region/RegionSystem.java

@@ -19,6 +19,7 @@
 
 package de.steamwar.bausystem.region;
 
+import de.steamwar.bausystem.BauSystem;
 import de.steamwar.core.Core;
 import lombok.NonNull;
 import org.bukkit.Location;
@@ -27,10 +28,13 @@ import javax.annotation.CheckReturnValue;
 import java.lang.reflect.InvocationTargetException;
 import java.util.Optional;
 import java.util.UUID;
+import java.util.logging.Logger;
 import java.util.stream.Stream;
 
 public interface RegionSystem {
 
+    Logger LOGGER = BauSystem.getInstance().getLogger();
+
     UUID GLOBAL_REGION_ID = new UUID(0, 0);
 
     RegionSystem INSTANCE = init();

BauSystem/BauSystem_RegionDynamic/src/de/steamwar/bausystem/region/00000000-0000-0000-0000-000000000000/flags.json

@@ -0,0 +1,4 @@
+{
+  "TNT": "DENY",
+  "FREEZE": "INACTIVE"
+}

BauSystem/BauSystem_RegionDynamic/src/de/steamwar/bausystem/region/00000000-0000-0000-0000-000000000000/meta.json

@@ -0,0 +1,5 @@
+{
+  "region_identifier": "SpawnRegion",
+  "tile_x": 0,
+  "tile_z": 0
+}

BauSystem/BauSystem_RegionDynamic/src/de/steamwar/bausystem/region/DynamicRegionSystem.java

@@ -19,21 +19,38 @@
 
 package de.steamwar.bausystem.region;
 
+import com.google.gson.JsonIOException;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonSyntaxException;
 import de.steamwar.bausystem.BauSystem;
 import de.steamwar.bausystem.region.dynamic.DynamicRegion;
 import de.steamwar.bausystem.region.dynamic.RegionConstructorData;
 import de.steamwar.bausystem.region.dynamic.Tile;
 import de.steamwar.bausystem.region.dynamic.global.GlobalRegion;
 import lombok.NonNull;
+import org.bukkit.Bukkit;
 import org.bukkit.Location;
 
-import java.io.BufferedReader;
-import java.io.InputStreamReader;
+import java.io.*;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Parameter;
 import java.util.*;
+import java.util.function.Function;
+import java.util.logging.Level;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 public class DynamicRegionSystem implements RegionSystem {
 
+    public static final File REGION_DATA_FOLDER = new File(Bukkit.getWorlds().get(0).getWorldFolder(), "steamwar_regions");
+    public static final String META_FILE_NAME = "meta.json";
+
+    static {
+        REGION_DATA_FOLDER.mkdirs();
+    }
+
     public static DynamicRegionSystem INSTANCE;
 
     private static final Map<Long, Region> regionCache = new LinkedHashMap<>(16, 0.75f, true) {
@@ -57,11 +74,15 @@ public class DynamicRegionSystem implements RegionSystem {
         regionTypeMap.getOrDefault(region.getType(), Collections.emptySet()).remove(region);
     }
 
+    private static Map<Class<? extends DynamicRegion>, RegionConstructorData> constructorDataMap = new HashMap<>();
+    private static Map<String, Class<? extends DynamicRegion>> identifierDataMap = new HashMap<>();
+
     @Override
     public void load() {
         INSTANCE = this;
 
-        new BufferedReader(new InputStreamReader(BauSystem.getInstance().getClass().getResourceAsStream("/META-INF/annotations/de.steamwar.bausystem.region.dynamic.RegionConstructorData")))
+        // Loading all Region Constructor Data that are defined inside the Code
+        constructorDataMap = new BufferedReader(new InputStreamReader(BauSystem.getInstance().getClass().getResourceAsStream("/META-INF/annotations/de.steamwar.bausystem.region.dynamic.RegionConstructorData")))
                 .lines()
                 .map(s -> {
                     try {
@@ -70,11 +91,114 @@ public class DynamicRegionSystem implements RegionSystem {
                         throw new SecurityException(e.getMessage(), e);
                     }
                 })
-                .forEach(clazz -> {
-                    RegionConstructorData regionConstructorData = clazz.getAnnotation(RegionConstructorData.class);
-                    if (regionConstructorData == null) return;
-                    // TODO: Save regionConstructorData together with clazz
-                });
+                .filter(DynamicRegion.class::isAssignableFrom)
+                .map(clazz -> (Class<? extends DynamicRegion>) clazz)
+                .collect(Collectors.toUnmodifiableMap(Function.identity(), clazz -> clazz.getAnnotation(RegionConstructorData.class)));
+        identifierDataMap = constructorDataMap.entrySet()
+                .stream()
+                .collect(Collectors.toUnmodifiableMap(entry -> entry.getValue().identifier(), Map.Entry::getKey));
+
+        // Loading all saved regions from the files
+        File[] regions = REGION_DATA_FOLDER.listFiles();
+        for (File region : regions) {
+            UUID regionUUID;
+            try {
+                regionUUID = UUID.fromString(region.getName());
+            } catch (IllegalArgumentException e) {
+                LOGGER.log(Level.WARNING, "Failed to resolve region id: " + region.getName());
+                continue;
+            }
+            if (regionUUID == GLOBAL_REGION_ID) {
+                continue;
+            }
+
+            File metaFile = new File(region, META_FILE_NAME);
+            if (!metaFile.exists() || !metaFile.isFile()) {
+                LOGGER.log(Level.WARNING, "Failed to resolve " + region.getName());
+                continue;
+            }
+
+            JsonObject metaData;
+            try {
+                metaData = JsonParser.parseReader(new FileReader(metaFile)).getAsJsonObject();
+            } catch (JsonIOException e) {
+                LOGGER.log(Level.SEVERE, "Failed to read region metadata file (unknown)");
+                continue;
+            } catch (JsonSyntaxException | IllegalStateException e) {
+                LOGGER.log(Level.SEVERE, "Failed to read region metadata file (invalid json)");
+                continue;
+            } catch (FileNotFoundException e) {
+                LOGGER.log(Level.SEVERE, "Failed to read region metadata file (not found)");
+                continue;
+            }
+
+            int tileX;
+            int tileZ;
+            String identifier;
+            try {
+                tileX = metaData.getAsJsonPrimitive("tile_x").getAsInt();
+                tileZ = metaData.getAsJsonPrimitive("tile_z").getAsInt();
+                identifier = metaData.getAsJsonPrimitive("region_identifier").getAsString();
+            } catch (ClassCastException | NumberFormatException e) {
+                LOGGER.log(Level.SEVERE, "Failed to read region metadata file (invalid json)");
+                continue;
+            }
+
+            Class<? extends DynamicRegion> regionClass = identifierDataMap.get(identifier);
+            if (regionClass == null) {
+                LOGGER.log(Level.SEVERE, "Failed to read region metadata file (region no longer exists)");
+                continue;
+            }
+            RegionConstructorData constructorData = constructorDataMap.get(regionClass);
+
+            Optional<Tile> optionalTile = Tile.fromTile(tileX, tileZ);
+            if (optionalTile.isEmpty()) {
+                LOGGER.log(Level.SEVERE, "Failed to read region metadata file (tile is no longer in bounds)");
+                continue;
+            }
+            Tile tile = optionalTile.get();
+            Location minTileLocation = tile.getMinLocation();
+
+            Constructor<? extends DynamicRegion> regionConstructor;
+            try {
+                regionConstructor = regionClass.getConstructor(UUID.class, int.class, int.class);
+            } catch (NoSuchMethodException e) {
+                LOGGER.log(Level.SEVERE, "Failed to read region metadata file (region constructor not found)");
+                continue;
+            }
+
+            Class<? extends RegionData> regionDataClass = constructorData.regionDataClass();
+            Constructor<? extends RegionData> regionDataConstructor = null;
+            for (Constructor<?> constructor : regionDataClass.getConstructors()) {
+                if (constructor.getParameters().length != 1) continue;
+                Parameter parameter = constructor.getParameters()[0];
+                if (parameter.getType().isAssignableFrom(regionClass)) {
+                    regionDataConstructor = (Constructor<? extends RegionData>) constructor;
+                    break;
+                }
+            }
+            if (regionDataConstructor == null) {
+                LOGGER.log(Level.SEVERE, "Failed to read region metadata file (region data constructor not found)");
+                continue;
+            }
+
+            DynamicRegion dynamicRegion;
+            try {
+                dynamicRegion = regionConstructor.newInstance(regionUUID, minTileLocation.getBlockX(), minTileLocation.getBlockZ());
+            } catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
+                LOGGER.log(Level.SEVERE, "Failed to read region metadata file (invalid data)");
+                continue;
+            }
+
+            RegionData regionData;
+            try {
+                regionData = regionDataConstructor.newInstance(dynamicRegion);
+            } catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
+                LOGGER.log(Level.SEVERE, "Failed to instantiate region data (invalid data)");
+                continue;
+            }
+            dynamicRegion.setRegionData(regionData);
+        }
     }
 
     @Override

BauSystem/BauSystem_RegionDynamic/src/de/steamwar/bausystem/region/dynamic/RegionConstructorData.java

@@ -31,6 +31,7 @@ import java.lang.annotation.Target;
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.TYPE)
 public @interface RegionConstructorData {
+    String identifier();
     int widthX();
     int widthZ();
     boolean placeable() default true;