map last access cache

package reghzy.carrottools.utils;

public abstract class KVObjEqualityCache<K, V> {
    private K lastAccessedKey;
    private V lastAccessedValue;

    public V get(K key) {
        if (key == null) {
            this.lastAccessedKey = null;
            this.lastAccessedValue = getValue(null);
        }
        else if (this.lastAccessedKey == null) {
            this.lastAccessedKey = key;
            this.lastAccessedValue = getValue(key);
        }
        else if (this.lastAccessedKey == key) {
            if (this.lastAccessedValue == null) {
                this.lastAccessedValue = getValue(key);
            }
        }
        else if (this.lastAccessedKey.equals(key)) {
            if (this.lastAccessedValue == null) {
                this.lastAccessedValue = getValue(key);
            }

            this.lastAccessedKey = key;
        }
        else {
            this.lastAccessedKey = key;
            this.lastAccessedValue = getValue(key);
        }

        return this.lastAccessedValue;
    }

    public abstract V getValue(K key);
}