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<?php

/**
 * Interface for objects that have a getHash method.
 *
 * @since 0.1
 *
 * @licence GNU GPL v2+
 * @author Jeroen De Dauw < jeroendedauw@gmail.com >
 */
interface Hashable {

	/**
	 * Returns a string hash based on the value of the object. The string must not exceed
	 * 255 bytes (255 ASCII characters or less when it contains Unicode characters that
	 * need to be UTF-8 encoded) to allow using indexes on all database systems.
	 *
	 * @since 0.1
	 *
	 * @return string
	 */
	public function getHash();

}