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This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).

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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 reseting 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);
}