feat(D-01): add ComponentHolder container for item components

src/main/java/com/tiedup/remake/v2/bondage/component/ComponentHolder.java

@@ -0,0 +1,70 @@
+package com.tiedup.remake.v2.bondage.component;
+
+import java.util.Collections;
+import java.util.EnumMap;
+import java.util.Map;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.item.ItemStack;
+import org.jetbrains.annotations.Nullable;
+
+public final class ComponentHolder {
+
+    public static final ComponentHolder EMPTY = new ComponentHolder(Map.of());
+
+    private final Map<ComponentType, IItemComponent> components;
+
+    public ComponentHolder(Map<ComponentType, IItemComponent> components) {
+        this.components = components.isEmpty()
+            ? Map.of()
+            : Collections.unmodifiableMap(new EnumMap<>(components));
+    }
+
+    @Nullable
+    public IItemComponent get(ComponentType type) {
+        return components.get(type);
+    }
+
+    @Nullable
+    @SuppressWarnings("unchecked")
+    public <T extends IItemComponent> T get(
+        ComponentType type,
+        Class<T> clazz
+    ) {
+        IItemComponent component = components.get(type);
+        if (clazz.isInstance(component)) return (T) component;
+        return null;
+    }
+
+    public boolean has(ComponentType type) {
+        return components.containsKey(type);
+    }
+
+    public void onEquipped(ItemStack stack, LivingEntity entity) {
+        for (IItemComponent c : components.values()) {
+            c.onEquipped(stack, entity);
+        }
+    }
+
+    public void onUnequipped(ItemStack stack, LivingEntity entity) {
+        for (IItemComponent c : components.values()) {
+            c.onUnequipped(stack, entity);
+        }
+    }
+
+    public void onWornTick(ItemStack stack, LivingEntity entity) {
+        for (IItemComponent c : components.values()) {
+            c.onWornTick(stack, entity);
+        }
+    }
+
+    public boolean blocksUnequip(ItemStack stack, LivingEntity entity) {
+        for (IItemComponent c : components.values()) {
+            if (c.blocksUnequip(stack, entity)) return true;
+        }
+        return false;
+    }
+
+    public boolean isEmpty() {
+        return components.isEmpty();
+    }
+}