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import org.spongepowered.api.item.ItemType;
import org.spongepowered.api.item.ItemTypes;
import org.spongepowered.api.item.inventory.ItemStack;

public boolean isStick(ItemStack stack) {
    ItemType type = stack.getItem();
    return type.equals(ItemTypes.STICK);
}

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import org.spongepowered.api.data.key.Keys;

public void setUnbreakable(ItemStack stack) {
    stack.offer(Keys.UNBREAKABLE, true);
}

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import org.spongepowered.api.text.Text;

import java.util.List;

public void setLore(ItemStack stack, List<Text> itemLore) {
    if (stack.get(Keys.ITEM_LORE).isPresent()) {
        stack.offer(Keys.ITEM_LORE, itemLore);
    }
}

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import org.spongepowered.api.block.BlockTypes;
import org.spongepowered.api.data.property.item.HarvestingProperty;

import java.util.Optional;

public boolean canMineObsidian(ItemStack stack) {
    Optional<HarvestingProperty> optional =
        stack.getProperty(HarvestingProperty.class);

    if (optional.isPresent()) {
        HarvestingProperty property = optional.get();
        return property.getValue().contains(BlockTypes.OBSIDIAN);
    }
    return false;
}

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public boolean isEqual(ItemStack stack1, ItemStack stack2) {
    return stack1.equalTo(stack2);
}