/*
* Copyright (C) 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.waveprotocol.wave.model.version;
import org.waveprotocol.wave.model.id.WaveletName;
/**
* Factory for hashed versions.
*
* @author anorth@google.com (Alex North)
*/
public interface HashedVersionFactory {
/** Creates a hashed version zero for a wavelet. */
HashedVersion createVersionZero(WaveletName waveletName);
/**
* Creates a hashed version after the application of a delta. The new version
* is targetVersion + opsApplied.
*
* @param appliedDeltaBytes byte representation of applied delta
* @param versionAppliedAt version to which the delta applied
* @param opsApplied number of ops in the delta
* @return a hashed version after the delta application
*/
HashedVersion create(byte[] appliedDeltaBytes, HashedVersion versionAppliedAt, int opsApplied);
}