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Signal Protocol cryptography library for Java

There is a newer version: 2.8.1

/**
 * Copyright (C) 2014-2016 Open Whisper Systems
 *
 * Licensed according to the LICENSE file in this repository.
 */
package org.whispersystems.libsignal.state;

import org.whispersystems.libsignal.InvalidKeyIdException;

import java.util.List;

public interface SignedPreKeyStore {


  /**
   * Load a local SignedPreKeyRecord.
   *
   * @param signedPreKeyId the ID of the local SignedPreKeyRecord.
   * @return the corresponding SignedPreKeyRecord.
   * @throws InvalidKeyIdException when there is no corresponding SignedPreKeyRecord.
   */
  public SignedPreKeyRecord loadSignedPreKey(int signedPreKeyId) throws InvalidKeyIdException;

  /**
   * Load all local SignedPreKeyRecords.
   *
   * @return All stored SignedPreKeyRecords.
   */
  public List loadSignedPreKeys();

  /**
   * Store a local SignedPreKeyRecord.
   *
   * @param signedPreKeyId the ID of the SignedPreKeyRecord to store.
   * @param record the SignedPreKeyRecord.
   */
  public void         storeSignedPreKey(int signedPreKeyId, SignedPreKeyRecord record);

  /**
   * @param signedPreKeyId A SignedPreKeyRecord ID.
   * @return true if the store has a record for the signedPreKeyId, otherwise false.
   */
  public boolean      containsSignedPreKey(int signedPreKeyId);

  /**
   * Delete a SignedPreKeyRecord from local storage.
   *
   * @param signedPreKeyId The ID of the SignedPreKeyRecord to remove.
   */
  public void         removeSignedPreKey(int signedPreKeyId);

}