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package gregtech.api.objects;
import net.minecraft.init.Items;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import gregtech.api.enums.GT_Values;
import gregtech.api.util.GT_Utility;
import gregtech.api.util.item.ItemHolder;
import it.unimi.dsi.fastutil.Hash;
/**
* An optimization of {@link ItemStack} to have a better {@code hashcode} and {@code equals} in order to improve
* {@code HashMap} and {@code Set} performance
*/
public class GT_ItemStack extends ItemHolder {
/**
* A better {@link Hash.Strategy} for {@link ItemStack}. Implementation originally from {@code GT_ItemStack2}.
*/
public static final Hash.Strategy<ItemStack> ITEMSTACK_HASH_STRATEGY2 = new Hash.Strategy<>() {
@Override
public int hashCode(ItemStack o) {
return o.getItem()
.hashCode() * 38197 + Items.feather.getDamage(o);
}
@Override
public boolean equals(ItemStack a, ItemStack b) {
if (a == b) return true;
if (a == null || b == null) return false;
return a.getItem() == b.getItem() && Items.feather.getDamage(a) == Items.feather.getDamage(b);
}
};
public final Item mItem;
public final byte mStackSize;
public final short mMetaData;
public GT_ItemStack(Item aItem, long aStackSize, long aMetaData) {
super(new ItemStack(aItem, 1, (int) aMetaData));
mItem = aItem;
mStackSize = (byte) aStackSize;
mMetaData = (short) aMetaData;
}
public GT_ItemStack(ItemStack aStack) {
this(aStack, false);
}
public GT_ItemStack(ItemStack aStack, boolean wildcard) {
this(
aStack == null ? null : aStack.getItem(),
aStack == null ? 0 : aStack.stackSize,
aStack == null ? 0 : wildcard ? GT_Values.W : Items.feather.getDamage(aStack));
}
public GT_ItemStack(int aHashCode) {
this(GT_Utility.intToStack(aHashCode));
}
public final ItemStack toStack() {
if (mItem == null) return null;
return new ItemStack(mItem, 1, mMetaData);
}
public final boolean isStackEqual(ItemStack aStack) {
return GT_Utility.areStacksEqual(toStack(), aStack);
}
public final boolean isStackEqual(GT_ItemStack aStack) {
return GT_Utility.areStacksEqual(toStack(), aStack.toStack());
}
@Override
public boolean equals(Object aStack) {
if (aStack == this) return true;
if (aStack instanceof GT_ItemStack) {
return ((GT_ItemStack) aStack).mItem == mItem && ((GT_ItemStack) aStack).mMetaData == mMetaData;
}
return false;
}
@Override
public int hashCode() {
return GT_Utility.stackToInt(toStack());
}
/**
* @see #internalCopyStack(ItemStack, boolean)
*/
public static ItemStack internalCopyStack(ItemStack aStack) {
return internalCopyStack(aStack, false);
}
/**
* Replicates the copy behavior of {@link #toStack()} but for normal {@link ItemStack}s.
*
* @param aStack the stack to copy
* @param wildcard whether to use wildcard damage value
* @return a copy of the stack with stack size 1 and no NBT
*/
public static ItemStack internalCopyStack(ItemStack aStack, boolean wildcard) {
return new ItemStack(aStack.getItem(), 1, wildcard ? GT_Values.W : Items.feather.getDamage(aStack));
}
}
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