Save and load items

src/main/java/me/unurled/sacredrealms/sr/components/item/Item.java

@@ -2,12 +2,19 @@ package me.unurled.sacredrealms.sr.components.item;
 
 import static me.unurled.sacredrealms.sr.utils.Component.comp;
 import static me.unurled.sacredrealms.sr.utils.Items.lore;
+import static me.unurled.sacredrealms.sr.utils.Logger.error;
 
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.reflect.TypeToken;
+import java.lang.reflect.Type;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import me.unurled.sacredrealms.sr.components.attributes.Attribute;
 import me.unurled.sacredrealms.sr.components.item.abilities.Ability;
 import me.unurled.sacredrealms.sr.components.item.enchantments.Enchantment;
+import me.unurled.sacredrealms.sr.data.gson.AbilityDeserializer;
 import org.bukkit.Material;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
@@ -38,7 +45,7 @@ import org.jetbrains.annotations.NotNull;
  * */
 public class Item {
 
-  @NotNull private final String ID;
+  @NotNull private String ID;
 
   @NotNull private String name;
 
@@ -50,12 +57,27 @@ public class Item {
 
   @NotNull private Rarity rarity;
 
+  @NotNull private ItemType type;
+
   @NotNull private HashMap<Attribute, Double> attributes;
 
   @NotNull private HashMap<Enchantment, Integer> enchantments;
 
   @NotNull private List<Ability> abilities;
 
+  public Item() {
+    this.ID = "";
+    this.name = "";
+    this.material = Material.AIR;
+    this.description = "";
+    this.rarity = Rarity.COMMON;
+    this.customModelData = 0;
+    this.abilities = List.of();
+    this.attributes = new HashMap<>();
+    this.enchantments = new HashMap<>();
+    this.type = ItemType.MISC;
+  }
+
   public Item(@NotNull String ID, @NotNull String name, @NotNull Material material) {
     this.ID = ID;
     this.name = name;
@@ -66,6 +88,7 @@ public class Item {
     this.abilities = List.of();
     this.attributes = new HashMap<>();
     this.enchantments = new HashMap<>();
+    this.type = ItemType.MISC;
   }
 
   public @NotNull String getID() {
@@ -189,24 +212,55 @@ public class Item {
   @Override
   public String toString() {
     return "{"
-        + "ID: "
+        + "\"id\": \""
         + ID
-        + ", name: "
+        + "\", \"name\": \""
         + name
-        + ", material: "
+        + "\", \"material\": \""
         + material
-        + ", description: "
+        + "\", \"description\": \""
         + description
-        + ", customModelData: "
+        + "\", \"customModelData\": "
         + customModelData
-        + ", rarity: "
+        + "\", \"rarity\": \""
         + rarity
-        + ", attributes: "
+        + "\", \"type\": \""
+        + type
+        + "\", \"attributes\": \""
         + attributes
-        + ", enchantments: "
+        + "\", \"enchantments\": \""
         + enchantments
-        + ", abilities: "
+        + "\", \"abilities\": \""
         + abilities
-        + "}";
+        + "\"}";
+  }
+
+  public void fromString(String item) {
+    // extract every information from the string (it follows the same format as the toString method)
+    Gson gson =
+        new GsonBuilder().registerTypeAdapter(Ability.class, new AbilityDeserializer()).create();
+    try {
+      Map<String, Object> map =
+          gson.fromJson(item, new TypeToken<Map<String, Object>>() {}.getType());
+
+      this.ID = (String) map.get("id");
+      this.name = (String) map.get("name");
+      this.material = Material.valueOf((String) map.get("material"));
+      this.description = (String) map.get("description");
+      this.customModelData = ((Double) map.get("customModelData")).intValue();
+      this.rarity = Rarity.valueOf((String) map.get("rarity"));
+      this.type = ItemType.valueOf((String) map.get("type"));
+
+      Type attributeType = new TypeToken<HashMap<Attribute, Double>>() {}.getType();
+      this.attributes = gson.fromJson((String) map.get("attributes"), attributeType);
+
+      Type enchantmentType = new TypeToken<HashMap<Enchantment, Integer>>() {}.getType();
+      this.enchantments = gson.fromJson((String) map.get("enchantments"), enchantmentType);
+
+      Type abilityType = new TypeToken<List<Ability>>() {}.getType();
+      this.abilities = gson.fromJson((String) map.get("abilities"), abilityType);
+    } catch (Exception e) {
+      error("Failed to parse item from string: " + item + "\n" + e.getMessage());
+    }
   }
 }

src/main/java/me/unurled/sacredrealms/sr/components/item/ItemManager.java

@@ -1,6 +1,12 @@
 package me.unurled.sacredrealms.sr.components.item;
 
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
 import java.util.HashMap;
+import me.unurled.sacredrealms.sr.data.DataHandler;
+import me.unurled.sacredrealms.sr.data.DataManager;
+import me.unurled.sacredrealms.sr.data.gson.ItemDeserializer;
+import me.unurled.sacredrealms.sr.data.gson.ItemStackSerializer;
 import me.unurled.sacredrealms.sr.managers.Manager;
 import org.bukkit.NamespacedKey;
 import org.bukkit.inventory.ItemStack;
@@ -17,14 +23,41 @@ public class ItemManager extends Manager {
     items = new HashMap<>();
   }
 
-  /** Register all the items */
-  private void registerItems() {}
-
   /** Load the manager */
   @Override
   public void load() {
     super.load();
-    registerItems();
+  }
+
+  /** Save the data */
+  @Override
+  public void saveData() {
+    DataManager dm = DataManager.getInstance(DataManager.class);
+    DataHandler dh = dm.getDataHandler();
+
+    Gson gson =
+        new GsonBuilder().registerTypeAdapter(Item.class, new ItemStackSerializer()).create();
+
+    items.forEach(
+        (id, item) -> {
+          dh.set("sr.items." + id, gson.toJson(item));
+        });
+  }
+
+  /** Load the data */
+  @Override
+  public void loadData() {
+    DataManager dm = DataManager.getInstance(DataManager.class);
+    DataHandler dh = dm.getDataHandler();
+
+    Gson gson = new GsonBuilder().registerTypeAdapter(Item.class, new ItemDeserializer()).create();
+
+    dh.getKeysAll("sr.items")
+        .forEach(
+            key -> {
+              Item item = gson.fromJson(dh.get(key), Item.class);
+              items.put(item.getID(), item);
+            });
   }
 
   public void addItem(Item item) {

src/main/java/me/unurled/sacredrealms/sr/components/item/ItemType.java

@@ -0,0 +1,8 @@
+package me.unurled.sacredrealms.sr.components.item;
+
+public enum ItemType {
+  WEAPON,
+  ARMOR,
+  CONSUMABLE,
+  MISC
+}

src/main/java/me/unurled/sacredrealms/sr/components/item/abilities/Ability.java

@@ -1,41 +1,26 @@
 package me.unurled.sacredrealms.sr.components.item.abilities;
 
+
 /** Represents an ability that an item can have. TODO: Implement this class */
 @SuppressWarnings("unused")
-public class Ability {
+public record Ability(
+    String name, String description, Integer cooldown, Integer manaCost, Integer damage) {
 
-  private final String name;
-  private final String description;
-  private final Integer cooldown;
-  private final Integer manaCost;
-  private final Integer damage;
-
-  public Ability(
-      String name, String description, Integer cooldown, Integer manaCost, Integer damage) {
-    this.name = name;
-    this.description = description;
-    this.cooldown = cooldown;
-    this.manaCost = manaCost;
-    this.damage = damage;
-  }
-
-  public String getName() {
-    return name;
-  }
-
-  public String getDescription() {
-    return description;
-  }
-
-  public Integer getCooldown() {
-    return cooldown;
-  }
-
-  public Integer getManaCost() {
-    return manaCost;
-  }
-
-  public Integer getDamage() {
-    return damage;
+  @Override
+  public String toString() {
+    return "Ability{"
+        + "name='"
+        + name
+        + '\''
+        + ", description='"
+        + description
+        + '\''
+        + ", cooldown="
+        + cooldown
+        + ", manaCost="
+        + manaCost
+        + ", damage="
+        + damage
+        + '}';
   }
 }

src/main/java/me/unurled/sacredrealms/sr/data/gson/AbilityDeserializer.java

@@ -0,0 +1,46 @@
+package me.unurled.sacredrealms.sr.data.gson;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import java.lang.reflect.Type;
+import me.unurled.sacredrealms.sr.components.item.abilities.Ability;
+
+public class AbilityDeserializer implements JsonDeserializer<Ability> {
+
+  /**
+   * Gson invokes this call-back method during deserialization when it encounters a field of the
+   * specified type.
+   *
+   * <p>In the implementation of this call-back method, you should consider invoking {@link
+   * JsonDeserializationContext#deserialize(JsonElement, Type)} method to create objects for any
+   * non-trivial field of the returned object. However, you should never invoke it on the same type
+   * passing {@code json} since that will cause an infinite loop (Gson will call your call-back
+   * method again).
+   *
+   * @param json The Json data being deserialized
+   * @param typeOfT The type of the Object to deserialize to
+   * @param context
+   * @return a deserialized object of the specified type typeOfT which is a subclass of {@code T}
+   * @throws JsonParseException if json is not in the expected format of {@code typeofT}
+   */
+  @Override
+  public Ability deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
+      throws JsonParseException {
+    try {
+      JsonObject jsonObject = json.getAsJsonObject();
+
+      String name = jsonObject.get("name").getAsString();
+      String description = jsonObject.get("description").getAsString();
+      Integer cooldown = jsonObject.get("cooldown").getAsInt();
+      Integer manaCost = jsonObject.get("manaCost").getAsInt();
+      Integer damage = jsonObject.get("damage").getAsInt();
+
+      return new Ability(name, description, cooldown, manaCost, damage);
+    } catch (Exception e) {
+      throw new JsonParseException("Error deserializing Ability: " + e.getMessage());
+    }
+  }
+}

src/main/java/me/unurled/sacredrealms/sr/data/gson/ItemDeserializer.java

@@ -0,0 +1,35 @@
+package me.unurled.sacredrealms.sr.data.gson;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+import java.lang.reflect.Type;
+import me.unurled.sacredrealms.sr.components.item.Item;
+
+public class ItemDeserializer implements JsonDeserializer<Item> {
+
+  /**
+   * Gson invokes this call-back method during deserialization when it encounters a field of the
+   * specified type.
+   *
+   * <p>In the implementation of this call-back method, you should consider invoking {@link
+   * JsonDeserializationContext#deserialize(JsonElement, Type)} method to create objects for any
+   * non-trivial field of the returned object. However, you should never invoke it on the same type
+   * passing {@code json} since that will cause an infinite loop (Gson will call your call-back
+   * method again).
+   *
+   * @param json The Json data being deserialized
+   * @param typeOfT The type of the Object to deserialize to
+   * @param context
+   * @return a deserialized object of the specified type typeOfT which is a subclass of {@code T}
+   * @throws JsonParseException if json is not in the expected format of {@code typeofT}
+   */
+  @Override
+  public Item deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
+      throws JsonParseException {
+    Item item = new Item();
+    item.fromString(json.getAsString());
+    return item;
+  }
+}

src/main/java/me/unurled/sacredrealms/sr/data/gson/ItemSerializer.java

@@ -0,0 +1,31 @@
+package me.unurled.sacredrealms.sr.data.gson;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import java.lang.reflect.Type;
+import me.unurled.sacredrealms.sr.components.item.Item;
+
+public class ItemSerializer implements JsonSerializer<Item> {
+
+  /**
+   * Gson invokes this call-back method during serialization when it encounters a field of the
+   * specified type.
+   *
+   * <p>In the implementation of this call-back method, you should consider invoking {@link
+   * JsonSerializationContext#serialize(Object, Type)} method to create JsonElements for any
+   * non-trivial field of the {@code src} object. However, you should never invoke it on the {@code
+   * src} object itself since that will cause an infinite loop (Gson will call your call-back method
+   * again).
+   *
+   * @param src the object that needs to be converted to Json.
+   * @param typeOfSrc the actual type (fully genericized version) of the source object.
+   * @param context
+   * @return a JsonElement corresponding to the specified object.
+   */
+  @Override
+  public JsonElement serialize(Item src, Type typeOfSrc, JsonSerializationContext context) {
+    return new JsonPrimitive(src.toString());
+  }
+}

src/main/java/me/unurled/sacredrealms/sr/utils/Items.java

@@ -102,10 +102,10 @@ public class Items {
       item.getAbilities()
           .forEach(
               a -> {
-                lore.add(comp("  <gray>➤ " + a.getName() + ",<yellow> " + a.getDescription()));
-                lore.add(comp("              <dark_gray>cooldown: " + a.getCooldown() + "s,"));
-                lore.add(comp("              <dark_gray>damage: " + a.getDamage() + ","));
-                lore.add(comp("              <dark_gray>mana cost: <dark_aqua>" + a.getManaCost()));
+                lore.add(comp("  <gray>➤ " + a.name() + ",<yellow> " + a.description()));
+                lore.add(comp("              <dark_gray>cooldown: " + a.cooldown() + "s,"));
+                lore.add(comp("              <dark_gray>damage: " + a.damage() + ","));
+                lore.add(comp("              <dark_gray>mana cost: <dark_aqua>" + a.manaCost()));
               });
     }
     if (!item.getEnchantments().isEmpty()) {