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// Burton Computer Corporation
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package org.javimmutable.collections.common;

import org.javimmutable.collections.Func1;

/**
 * Mutable object for tracking changes from zero.
 */
public class MutableDelta
        implements Func1
{
    private int value;

    public void add(int increment)
    {
        value += increment;
    }

    public void subtract(int decrement)
    {
        value -= decrement;
    }

    public int getValue()
    {
        return value;
    }

    @Override
    public Integer apply(Integer callerValue)
    {
        return value + callerValue;
    }
}