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Override method hashcode in ItemStack


f1rSt1kChannel

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I usually sort null -> item id -> metadata -> quantity -> having nbt -> nbt equals

 

You can sort by anything else afterwards.

 

It just takes a bit of thinking, it isn't too bad.

BEFORE ASKING FOR HELP READ THE EAQ!

 

I'll help if I can. Apologies if I do something obviously stupid. :D

 

If you don't know basic Java yet, go and follow these tutorials.

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Write a wrapper for the ItemStack, now everything is working fine.

/** 
* @author Agravaine
*/
public class ItemStackHash{

private ItemStack iStack;

private boolean doCheckNBT = false;
private boolean doCheckStackSize = false;
private boolean doCheckDamage = false;

public ItemStackHash(Block block){
	this(block, 1);
}

public ItemStackHash(Block block, int count){
	this(block, count, 0);
}

public ItemStackHash(Block block, int count, int damage){
	this(Item.getItemFromBlock(block), count, damage);
}

public ItemStackHash(Item item){
	this(item, 1);
}

public ItemStackHash(Item item, int count){
	this(item, count, 0);
}

public ItemStackHash(Item item, int count, int damage){
	iStack = new ItemStack(Preconditions.checkNotNull(item, "Item is null!"), count, damage);
}

public ItemStackHash(ItemStack itemStack){
	iStack = Preconditions.checkNotNull(itemStack, "ItemStack is null!");
}

private ItemStackHash(){
	throw new UnsupportedOperationException("Unsupported empty constructor!");
}

public ItemStackHash setDoCheckDamage(){
	doCheckDamage = true;
	return this;
}

public ItemStackHash setDoCheckStackSize(){
	doCheckStackSize = true;
	return this;
}

public ItemStackHash setDoCheckNBT(){
	doCheckNBT = true;
	return this;
}

public ItemStackHash setChecks(ItemStackHash parent){
	doCheckNBT = parent.doCheckNBT;
	doCheckDamage = parent.doCheckDamage;
	doCheckStackSize = parent.doCheckStackSize;
	return this;
}

public ItemStack getItemStack(){
	return iStack;
}

public int hashCode(){
	final int prime = 31;
	int result = 1;
	result = prime * result + Item.getIdFromItem(iStack.getItem());
	result = prime * result + (doCheckDamage ? iStack.getItemDamage() : 0);
	result = prime * result + (doCheckStackSize ? iStack.stackSize : 0);
	result = prime * result + (doCheckNBT && iStack.hasTagCompound() ? iStack.stackTagCompound.hashCode() : 0);
	return result;
}

public boolean equals(Object obj) {
	if(!(obj instanceof ItemStackHash)){
		return false;
	}

	ItemStackHash hashStack = (ItemStackHash)obj;

	if(Item.getIdFromItem(iStack.getItem()) != Item.getIdFromItem(hashStack.iStack.getItem())){
		return false;
	}

	if(doCheckDamage && iStack.getItemDamage() != hashStack.iStack.getItemDamage()){
		return false;
	}

	if(doCheckNBT && iStack.stackTagCompound != hashStack.iStack.stackTagCompound){
		return false;
	}

	if(doCheckStackSize && iStack.stackSize != hashStack.iStack.stackSize){
		return false;
	}

	return true;
}

public String toString(){
	return iStack.toString();
}
}

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