package gregtech.api.objects;

import gregtech.api.GregTech_API;
import gregtech.api.util.GT_Utility;

import java.util.*;

import net.minecraft.item.ItemStack;

public class GT_HashSet<E extends GT_ItemStack> extends AbstractSet<E> {
	private transient HashMap<GT_ItemStack, Object> map;
    private static final Object OBJECT = new Object();
    
    public GT_HashSet() {
        map = new HashMap<GT_ItemStack, Object>();
        GregTech_API.sItemStackMappings.add(map);
    }
    
    public GT_HashSet(Collection<? extends E> c) {
        map = new HashMap<GT_ItemStack, Object>(Math.max((int) (c.size()/.75f) + 1, 16));
        addAll(c);
        GregTech_API.sItemStackMappings.add(map);
    }
    
    public GT_HashSet(int initialCapacity, float loadFactor) {
        map = new HashMap<GT_ItemStack, Object>(initialCapacity, loadFactor);
        GregTech_API.sItemStackMappings.add(map);
    }
    
    public GT_HashSet(int initialCapacity) {
        map = new HashMap<GT_ItemStack, Object>(initialCapacity);
        GregTech_API.sItemStackMappings.add(map);
    }
    
    GT_HashSet(int initialCapacity, float loadFactor, boolean dummy) {
        map = new LinkedHashMap<GT_ItemStack, Object>(initialCapacity, loadFactor);
        GregTech_API.sItemStackMappings.add(map);
    }
    
    public HashMap getMap(){return map;}
    
    @Override
	public Iterator<E> iterator() {
        return (Iterator<E>)map.keySet().iterator();
    }
    
    @Override
	public int size() {
        return map.size();
    }
    
    @Override
	public boolean isEmpty() {
        return map.isEmpty();
    }
    
    @Override
	public boolean contains(Object o) {
        return map.containsKey(o);
    }
    
    public boolean add(ItemStack aStack) {
    	if (GT_Utility.isStackInvalid(aStack)) return false;
        return map.put(new GT_ItemStack(aStack), OBJECT)==null;
    }
    
    @Override
	public boolean add(E e) {
        return map.put(e, OBJECT)==null;
    }
    
    @Override
	public boolean remove(Object o) {
        return map.remove(o)==OBJECT;
    }
    
    @Override
	public void clear() {
        map.clear();
    }
}