Add item attributes

src/main/java/org/spongepowered/api/data/Keys.java

@@ -129,6 +129,7 @@
 import org.spongepowered.api.entity.Item;
 import org.spongepowered.api.entity.Ownable;
 import org.spongepowered.api.entity.ai.goal.GoalExecutorTypes;
+import org.spongepowered.api.entity.attribute.ItemAttribute;
 import org.spongepowered.api.entity.display.BillboardType;
 import org.spongepowered.api.entity.display.DisplayEntity;
 import org.spongepowered.api.entity.display.ItemDisplayType;
@@ -2181,6 +2182,11 @@ public final class Keys {
      */
     public static final Key<Value<Boolean>> IS_WET = Keys.key(ResourceKey.sponge("is_wet"), Boolean.class);
 
+    /**
+     * The {@link ItemAttribute}s an {@link ItemStack} can apply.
+     */
+    public static final Key<ListValue<ItemAttribute>> ITEM_ATTRIBUTES = Keys.listKey(ResourceKey.sponge("item_attributes"), ItemAttribute.class);
+
     /**
      * The {@link ItemDisplayType display type} of a {@link org.spongepowered.api.entity.display.ItemDisplay}.
      */

src/main/java/org/spongepowered/api/entity/attribute/AttributeModifier.java

@@ -24,6 +24,7 @@
  */
 package org.spongepowered.api.entity.attribute;
 
+import org.spongepowered.api.ResourceKey;
 import org.spongepowered.api.ResourceKeyed;
 import org.spongepowered.api.Sponge;
 import org.spongepowered.api.item.inventory.ItemStack;
@@ -38,6 +39,30 @@
  */
 public interface AttributeModifier extends ResourceKeyed {
 
+    /**
+     * Creates an attribute modifier with the given values.
+     *
+     * @param key The resource key
+     * @param operation The attribute operation
+     * @param amount The amount
+     * @return The attribute modifier
+     */
+    static AttributeModifier of(final ResourceKey key, final Supplier<? extends AttributeOperation> operation, final double amount) {
+        return AttributeModifier.builder().key(key).operation(operation).amount(amount).build();
+    }
+
+    /**
+     * Creates an attribute modifier with the given values.
+     *
+     * @param key The resource key
+     * @param operation The attribute operation
+     * @param amount The amount
+     * @return The attribute modifier
+     */
+    static AttributeModifier of(final ResourceKey key, final AttributeOperation operation, final double amount) {
+        return AttributeModifier.builder().key(key).operation(operation).amount(amount).build();
+    }
+
     /**
      * Creates a new {@link Builder} to create an {@link AttributeModifier}.
      *

src/main/java/org/spongepowered/api/entity/attribute/ItemAttribute.java

@@ -0,0 +1,114 @@
+/*
+ * This file is part of SpongeAPI, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package org.spongepowered.api.entity.attribute;
+
+import org.spongepowered.api.Sponge;
+import org.spongepowered.api.entity.attribute.type.AttributeType;
+import org.spongepowered.api.item.inventory.ItemStack;
+import org.spongepowered.api.item.inventory.equipment.EquipmentCondition;
+
+import java.util.Objects;
+import java.util.function.Supplier;
+
+/**
+ * Represents an {@link AttributeModifier} for the specific {@link AttributeType}
+ * an {@link ItemStack} can apply when the {@link EquipmentCondition} is met.
+ */
+public interface ItemAttribute {
+
+    /**
+     * Creates an item attribute with the given values.
+     *
+     * @param type The attribute type
+     * @param modifier The attribute modifier
+     * @param condition The equipment condition
+     * @return The item attribute
+     */
+    static ItemAttribute of(final Supplier<? extends AttributeType> type, final AttributeModifier modifier, final Supplier<? extends EquipmentCondition> condition) {
+        return ItemAttribute.of(Objects.requireNonNull(type, "type").get(), modifier, Objects.requireNonNull(condition, "condition").get());
+    }
+
+    /**
+     * Creates an item attribute with the given values.
+     *
+     * @param type The attribute type
+     * @param modifier The attribute modifier
+     * @param condition The equipment condition
+     * @return The item attribute
+     */
+    static ItemAttribute of(final Supplier<? extends AttributeType> type, final AttributeModifier modifier, final EquipmentCondition condition) {
+        return ItemAttribute.of(Objects.requireNonNull(type, "type").get(), modifier, condition);
+    }
+
+    /**
+     * Creates an item attribute with the given values.
+     *
+     * @param type The attribute type
+     * @param modifier The attribute modifier
+     * @param condition The equipment condition
+     * @return The item attribute
+     */
+    static ItemAttribute of(final AttributeType type, final AttributeModifier modifier, final Supplier<? extends EquipmentCondition> condition) {
+        return ItemAttribute.of(type, modifier, Objects.requireNonNull(condition, "condition").get());
+    }
+
+    /**
+     * Creates an item attribute with the given values.
+     *
+     * @param type The attribute type
+     * @param modifier The attribute modifier
+     * @param condition The equipment condition
+     * @return The item attribute
+     */
+    static ItemAttribute of(final AttributeType type, final AttributeModifier modifier, final EquipmentCondition condition) {
+        return Sponge.game().factoryProvider().provide(Factory.class).of(type, modifier, condition);
+    }
+
+    /**
+     * Returns the attribute type.
+     *
+     * @return The attribute type
+     */
+    AttributeType type();
+
+    /**
+     * Returns the attribute modifier.
+     *
+     * @return The attribute modifier
+     */
+    AttributeModifier modifier();
+
+    /**
+     * Returns the equipment condition.
+     *
+     * @return The equipment condition
+     */
+    EquipmentCondition condition();
+
+    interface Factory {
+
+        ItemAttribute of(AttributeType type, AttributeModifier modifier, EquipmentCondition condition);
+    }
+}

src/main/java/org/spongepowered/api/item/inventory/equipment/EquipmentCondition.java

@@ -0,0 +1,58 @@
+/*
+ * This file is part of SpongeAPI, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package org.spongepowered.api.item.inventory.equipment;
+
+import net.kyori.adventure.text.ComponentLike;
+import org.spongepowered.api.data.type.StringRepresentable;
+import org.spongepowered.api.registry.DefaultedRegistryValue;
+import org.spongepowered.api.util.annotation.CatalogedBy;
+
+import java.util.Objects;
+import java.util.function.Supplier;
+
+/**
+ * Represents some condition for {@link EquipmentType}.
+ */
+@CatalogedBy(EquipmentConditions.class)
+public interface EquipmentCondition extends DefaultedRegistryValue<EquipmentCondition>, StringRepresentable, ComponentLike {
+
+    /**
+     * Tests whether the equipment type is suitable for this condition.
+     *
+     * @param type The equipment type to test
+     * @return True if the equipment type is suitable for this condition
+     */
+    default boolean test(final Supplier<? extends EquipmentType> type) {
+        return this.test(Objects.requireNonNull(type, "type").get());
+    }
+
+    /**
+     * Tests whether the equipment type is suitable for this condition.
+     *
+     * @param type The equipment type to test
+     * @return True if the equipment type is suitable for this condition
+     */
+    boolean test(EquipmentType type);
+}

src/main/java/org/spongepowered/api/item/inventory/equipment/EquipmentConditions.java

@@ -0,0 +1,69 @@
+/*
+ * This file is part of SpongeAPI, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package org.spongepowered.api.item.inventory.equipment;
+
+import org.spongepowered.api.ResourceKey;
+import org.spongepowered.api.Sponge;
+import org.spongepowered.api.registry.DefaultedRegistryReference;
+import org.spongepowered.api.registry.Registry;
+import org.spongepowered.api.registry.RegistryKey;
+import org.spongepowered.api.registry.RegistryTypes;
+
+/**
+ * <!-- This file is automatically generated. Any manual changes will be overwritten. -->
+ */
+public final class EquipmentConditions {
+
+    public static final DefaultedRegistryReference<EquipmentCondition> ANY = EquipmentConditions.key(ResourceKey.sponge("any"));
+
+    public static final DefaultedRegistryReference<EquipmentCondition> ARMOR = EquipmentConditions.key(ResourceKey.sponge("armor"));
+
+    public static final DefaultedRegistryReference<EquipmentCondition> BODY = EquipmentConditions.key(ResourceKey.sponge("body"));
+
+    public static final DefaultedRegistryReference<EquipmentCondition> CHEST = EquipmentConditions.key(ResourceKey.sponge("chest"));
+
+    public static final DefaultedRegistryReference<EquipmentCondition> FEET = EquipmentConditions.key(ResourceKey.sponge("feet"));
+
+    public static final DefaultedRegistryReference<EquipmentCondition> HAND = EquipmentConditions.key(ResourceKey.sponge("hand"));
+
+    public static final DefaultedRegistryReference<EquipmentCondition> HEAD = EquipmentConditions.key(ResourceKey.sponge("head"));
+
+    public static final DefaultedRegistryReference<EquipmentCondition> LEGS = EquipmentConditions.key(ResourceKey.sponge("legs"));
+
+    public static final DefaultedRegistryReference<EquipmentCondition> MAINHAND = EquipmentConditions.key(ResourceKey.sponge("mainhand"));
+
+    public static final DefaultedRegistryReference<EquipmentCondition> OFFHAND = EquipmentConditions.key(ResourceKey.sponge("offhand"));
+
+    private EquipmentConditions() {
+    }
+
+    public static Registry<EquipmentCondition> registry() {
+        return Sponge.game().registry(RegistryTypes.EQUIPMENT_CONDITION);
+    }
+
+    private static DefaultedRegistryReference<EquipmentCondition> key(final ResourceKey location) {
+        return RegistryKey.of(RegistryTypes.EQUIPMENT_CONDITION, location).asDefaultedReference(Sponge::game);
+    }
+}

src/main/java/org/spongepowered/api/item/inventory/equipment/EquipmentType.java

@@ -40,4 +40,11 @@ public interface EquipmentType extends DefaultedRegistryValue<EquipmentType>, St
      * @return The group
      */
     EquipmentGroup group();
+
+    /**
+     * Gets the most specific {@link EquipmentCondition} for this equipment type.
+     *
+     * @return The condition
+     */
+    EquipmentCondition condition();
 }

src/main/java/org/spongepowered/api/registry/RegistryTypes.java

@@ -128,6 +128,7 @@
 import org.spongepowered.api.item.ItemType;
 import org.spongepowered.api.item.enchantment.EnchantmentType;
 import org.spongepowered.api.item.inventory.ContainerType;
+import org.spongepowered.api.item.inventory.equipment.EquipmentCondition;
 import org.spongepowered.api.item.inventory.equipment.EquipmentGroup;
 import org.spongepowered.api.item.inventory.equipment.EquipmentType;
 import org.spongepowered.api.item.inventory.menu.ClickType;
@@ -372,6 +373,8 @@ public final class RegistryTypes {
 
     public static final DefaultedRegistryType<DyeColor> DYE_COLOR = RegistryTypes.spongeKeyInGame("dye_color");
 
+    public static final DefaultedRegistryType<EquipmentCondition> EQUIPMENT_CONDITION = RegistryTypes.spongeKeyInGame("equipment_condition");
+
     public static final DefaultedRegistryType<EquipmentGroup> EQUIPMENT_GROUP = RegistryTypes.spongeKeyInGame("equipment_group");
 
     public static final DefaultedRegistryType<EquipmentType> EQUIPMENT_TYPE = RegistryTypes.spongeKeyInGame("equipment_type");