How to use co.cask.cdap.data2.dataset2.lib.table

static NamespacedEntityId getNamespacedIdFromKey(String type, byte[] rowKey) {
 MDSKey.Splitter keySplitter = new MDSKey(rowKey).split();
 // The rowkey is
 // [rowPrefix][targetType][targetId][key] for value rows and
 // [rowPrefix][targetType][targetId][key][index] for value index rows
 // so skip the first two.
 keySplitter.skipBytes();
 keySplitter.skipString();
 return EntityIdKeyHelper.getTargetIdIdFromKey(keySplitter, type);
}

 private static byte[] createRowKey(NamespacedEntityId targetId) {
  // We are not going to upgrade owner.meta table in 5.0, when we upgrade this table,
  // we should call  EntityIdKeyHelper#getTargetType()
  String targetType = EntityIdKeyHelper.getV1TargetType(targetId);
  MDSKey.Builder builder = new MDSKey.Builder();
  builder.add(OWNER_PREFIX);
  builder.add(targetType);
  EntityIdKeyHelper.addTargetIdToKey(builder, targetId);
  MDSKey build = builder.build();
  return build.getKey();
 }
}

private byte[] getChecksumRowKey(long checksum) {
 MDSKey.Builder builder = new MDSKey.Builder();
 builder.add(CHECKSUM_MARKER);
 builder.add(checksum);
 return builder.build().getKey();
}

static String extractTargetType(byte[] rowKey) {
 MDSKey.Splitter keySplitter = new MDSKey(rowKey).split();
 // skip rowPrefix
 keySplitter.skipBytes();
 // return targetType
 return keySplitter.getString();
}

public List<ProvisioningTaskInfo> listTaskInfo() {
 return table.list(new MDSKey.Builder().add(STATE_PREFIX).build(), ProvisioningTaskInfo.class);
}

private static MDSKey.Builder getMDSKeyPrefix(NamespacedEntityId targetId, byte[] rowPrefix) {
 String targetType = EntityIdKeyHelper.getV1TargetType(targetId);
 MDSKey.Builder builder = new MDSKey.Builder();
 builder.add(rowPrefix);
 builder.add(targetType);
 EntityIdKeyHelper.addTargetIdToKey(builder, targetId);
 return builder;
}

static String getTargetType(byte[] rowKey) {
 MDSKey.Splitter keySplitter = new MDSKey(rowKey).split();
 // The rowkey is
 // [rowPrefix][targetType][targetId][key] for value rows and
 // [rowPrefix][targetType][targetId][key][index] for value index rows
 keySplitter.getBytes();
 return keySplitter.getString();
}

/**
 * Returns mapping of all that has same first id parts for default COLUMN, with a limit
 *
 * @param id prefix row key
 * @param typeOfT the type of the result
 * @param limit limit of the result
 * @return map of row key to result
 */
public <T> Map<MDSKey, T> listKV(MDSKey id, Type typeOfT, int limit) {
 return listKV(id, null, typeOfT, limit, x -> true);
}

/**
 * Splits the keys into a {@link Splitter} which exposes the parts that comprise the key.
 */
public Splitter split() {
 return new Splitter(key);
}

private byte[] getChecksumRowKey(long checksum) {
 MDSKey.Builder builder = new MDSKey.Builder();
 builder.add(CHECKSUM_MARKER);
 builder.add(checksum);
 return builder.build().getKey();
}

static String extractTargetType(byte[] rowKey) {
 MDSKey.Splitter keySplitter = new MDSKey(rowKey).split();
 // skip rowPrefix
 keySplitter.skipBytes();
 // return targetType
 return keySplitter.getString();
}

 private static byte[] createRowKey(NamespacedEntityId targetId) {
  // We are not going to upgrade owner.meta table in 5.0, when we upgrade this table,
  // we should call  EntityIdKeyHelper#getTargetType()
  String targetType = EntityIdKeyHelper.getV1TargetType(targetId);
  MDSKey.Builder builder = new MDSKey.Builder();
  builder.add(OWNER_PREFIX);
  builder.add(targetType);
  EntityIdKeyHelper.addTargetIdToKey(builder, targetId);
  MDSKey build = builder.build();
  return build.getKey();
 }
}

/**
 * Add namespace and timestamp and return it as the scan key
 * @return scan key
 */
private byte[] getScanKey(String namespace, long timestamp) {
 MDSKey.Builder scanKeyBuilder = new MDSKey.Builder();
 scanKeyBuilder.add(namespace);
 scanKeyBuilder.add(timestamp);
 return scanKeyBuilder.build().getKey();
}

static String getNamespaceId(MDSKey key) {
 MDSKey.Splitter keySplitter = key.split();
 // The rowkey is
 // [rowPrefix][targetType][targetId][key] for value rows and
 // [rowPrefix][targetType][targetId][key][index] for value index rows
 // so skip the first two.
 keySplitter.skipBytes();
 keySplitter.skipString();
 // We are getting the first part of [targetId] which always be the namespace id.
 return keySplitter.getString();
}

/**
 * Add namespace and timestamp and return it as the scan key
 * @return scan key
 */
private byte[] getScanKey(String namespace, long timestamp) {
 MDSKey.Builder scanKeyBuilder = new MDSKey.Builder();
 scanKeyBuilder.add(namespace);
 scanKeyBuilder.add(timestamp);
 return scanKeyBuilder.build().getKey();
}

 private String extractFieldName(byte[] columnKey) {
  MDSKey.Splitter keySplitter = new MDSKey(columnKey).split();
  // The key is
  // [outgoing prefix (o)][EndPoint:Namespace][EndPoint:Name][fieldName]
  // skip prefix
  keySplitter.skipBytes();
  // Skip namespace
  keySplitter.skipString();
  // skip dataset name
  keySplitter.skipString();

  return keySplitter.getString();
 }
}

static byte[] getValueRowPrefix() {
 MDSKey key = new MDSKey.Builder().add(VALUE_ROW_PREFIX).build();
 return key.getKey();
}

 private String extractFieldName(byte[] columnKey) {
  MDSKey.Splitter keySplitter = new MDSKey(columnKey).split();
  // The key is
  // [outgoing prefix (o)][EndPoint:Namespace][EndPoint:Name][fieldName]
  // skip prefix
  keySplitter.skipBytes();
  // Skip namespace
  keySplitter.skipString();
  // skip dataset name
  keySplitter.skipString();

  return keySplitter.getString();
 }
}

static byte[] getIndexRowPrefix() {
 MDSKey key = new MDSKey.Builder().add(INDEX_ROW_PREFIX).build();
 return key.getKey();
}

static byte[] getHistoryRowPrefix() {
 MDSKey key = new MDSKey.Builder().add(ROW_PREFIX).build();
 return key.getKey();
}