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    • com.dropbox.core.util.Maybe Maven / Gradle / Ivy

    The newest version!
    package com.dropbox.core.util;

public final class Maybe
{
	private final boolean isJust;
	private final T value;

	private Maybe(boolean isJust, T value) { this.isJust = isJust; this.value = value; }

	private static final Maybe Nothing = new Maybe(false, null);

	public boolean isNothing() { return !this.isJust; }
	public boolean isJust() { return this.isJust; }
	public T getJust() { return this.value; }

	public T get(T def)
	{
		if (isJust) return value; else return def;
	}

	@SuppressWarnings("unchecked")
	public static  Maybe Nothing()
	{
		return (Maybe) Nothing;
	}

	public static  Maybe Just(T value)
	{
		return new Maybe(true, value);
	}

	public boolean equals(Object other)
	{
		if (other.getClass() != this.getClass()) return false;
		return equals((Maybe)other);
	}

	public boolean equals(Maybe other)
	{
		return this.isJust == other.isJust && eq(this.value, other.value);
	}

	private static boolean eq(Object a, Object b)
	{
		if (a == null) return (b == null);
		if (b == null) return false;
		return a.equals(b);
	}

	public String toString()
	{
		if (isJust) {
			return "Just(" + value + ")";
		} else {
			return "Nothing";
		}
	}

	public int hashCode()
	{
		if (!isJust) return 0;
		if (value == null) return 1;
		return value.hashCode();
	}
}
    
    
    
    

    




    
    
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