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package org.bouncycastle.util;
/**
* Interface for Memoable objects. Memoable objects allow the taking of a snapshot of their internal state
* via the copy() method and then resetting the object back to that state later using the reset() method.
*/
public interface Memoable
{
/**
* Produce a copy of this object with its configuration and in its current state.
*
* The returned object may be used simply to store the state, or may be used as a similar object
* starting from the copied state.
*/
Memoable copy();
/**
* Restore a copied object state into this object.
*
* Implementations of this method should try to avoid or minimise memory allocation to perform the reset.
*
* @param other an object originally {@link #copy() copied} from an object of the same type as this instance.
* @throws ClassCastException if the provided object is not of the correct type.
* @throws MemoableResetException if the other parameter is in some other way invalid.
*/
void reset(Memoable other);
}