[Snippet] How to negate/invert a Filter

[Botre]

A very basic snippet, I keep seeing people rewriting negations manually way too often.

Allows to you create inversions/negations of filters.

 

Example

		final Filter<String> IS_EMPTY = s -> s.isEmpty(); 
		final Filter<String> IS_NOT_EMPTY = negate(IS_EMPTY);

Snippet

	/**
	 * Returns a filter that represents the logical negation of the supplied filter.
	 * 
	 * @return a filter that represents the logical negation of the supplied filter
	 */
	public static final <T> Filter<T> negate(Filter<T> filter) {
		return e -> !filter.match(e);
	}

Edited April 9, 2016 by Botre

[DragonAlpha]

This is very useful.

[RamSkulls]

Ty

[amkate2]

​omg you saved me x: