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package com.github.underscore;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.function.Function;

public abstract class MemoizeFunction implements Function {
    private final Map cache = new LinkedHashMap();
    public abstract T calc(final F n);

    public T apply(final F key) {
        if (!cache.containsKey(key)) {
            cache.put(key, calc(key));
        }
        return cache.get(key);
    }
}