/*
* Copyright © 2015 Cask Data, 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 co.cask.cdap.data2.metadata.dataset;
import co.cask.cdap.api.common.Bytes;
import co.cask.cdap.data2.dataset2.lib.table.MDSKey;
import co.cask.cdap.proto.Id;
/**
* Key used to store metadata history.
*/
public class MdsHistoryKey {
private static final byte[] ROW_PREFIX = {'h'};
public static MDSKey getMdsKey(Id.NamespacedId targetId, long time) {
MDSKey.Builder builder = new MDSKey.Builder();
builder.add(ROW_PREFIX);
KeyHelper.addTargetIdToKey(builder, targetId);
builder.add(invertTime(time));
return builder.build();
}
public static MDSKey getMdsScanStartKey(Id.NamespacedId targetId, long time) {
return getMdsKey(targetId, time);
}
public static MDSKey getMdsScanEndKey(Id.NamespacedId targetId) {
MDSKey.Builder builder = new MDSKey.Builder();
builder.add(ROW_PREFIX);
KeyHelper.addTargetIdToKey(builder, targetId);
byte[] key = builder.build().getKey();
return new MDSKey(Bytes.stopKeyForPrefix(key));
}
private static long invertTime(long time) {
return Long.MAX_VALUE - time;
}
}