snuvi-engine/src/me/hammerle/snuviengine/api/KeyHandler.java

package me.hammerle.snuviengine.api;

import java.util.HashMap;

public final class KeyHandler
{
    private final static HashMap<Integer, KeyBinding> BINDINGS = new HashMap<>();
    private static KeyBinding rebind = null;
    
    public static KeyBinding register(int key) throws KeyDuplicateException
    {
        KeyBinding binding = new KeyBinding(key);
        if(BINDINGS.putIfAbsent(key, binding) != null)
        {
            throw new KeyDuplicateException("the key '" + key + "' has already been registered");
        }
        return binding;
    }
    
    public static void rebind(KeyBinding binding)
    {
        rebind = binding;
        if(binding != null)
        {
            binding.setIsRebinding(true);
        }
    }
    
    public static void rebind(KeyBinding binding, int key)
    {
        if(BINDINGS.containsKey(key))
        {
            return;
        }
        BINDINGS.remove(binding.getKey());
        binding.setKey(key);
        BINDINGS.put(key, binding);
    }

    protected static void onKeyDownEvent(int key) 
    {
        if(rebind != null)
        {
            rebind.setIsRebinding(false);
            rebind(rebind, key);
            rebind = null;
            return;
        }
        KeyBinding binding = BINDINGS.get(key);
        if(binding != null)
        {
            binding.onKeyDownEvent();
        }
    }

    protected static void onKeyUpEvent(int key) 
    {
        KeyBinding binding = BINDINGS.get(key);
        if(binding != null)
        {
            binding.onKeyUpEvent();
        }
    }
    
    protected static void tick()
    {
        BINDINGS.values().forEach(binding -> binding.tick());
    }
}