org.apache.iotdb.db.metadata.utils

类 MetaUtils

java.lang.Object

org.apache.iotdb.db.metadata.utils.MetaUtils

public class MetaUtils
extends Object

方法概要

限定符和类型	方法和说明
static void	collectLastNode(IMNode node, List<IMNode> lastNodeList)
static List<String>	getMultiFullPaths(IMNode node)
static PartialPath	getStorageGroupPathByLevel(PartialPath path, int level) Get storage group path when creating schema automatically is enable e.g., path = root.a.b.c and level = 1, return root.a
static Map<PartialPath,List<Integer>>	groupAggregationsBySeries(List<? extends Path> selectedPaths) Merge same series and convert to series map.
static List<PartialPath>	groupAlignedPaths(List<PartialPath> fullPaths) PartialPath of aligned time series will be organized to one AlignedPath.
static Map<AlignedPath,List<List<Integer>>>	groupAlignedSeriesWithAggregations(Map<PartialPath,List<Integer>> pathToAggrIndexesMap) Group all the series under an aligned entity into one AlignedPath and remove these series from pathToAggrIndexesMap.
static String[]	splitPathToDetachedPath(String path)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

方法详细资料

splitPathToDetachedPath

public static String[] splitPathToDetachedPath(String path)
                                        throws IllegalPathException

参数:

path - the path will split. ex, root.ln.

返回:

string array. ex, [root, ln]

抛出:

IllegalPathException - if path isn't correct, the exception will throw

getStorageGroupPathByLevel

public static PartialPath getStorageGroupPathByLevel(PartialPath path,
                                                     int level)
                                              throws MetadataException

Get storage group path when creating schema automatically is enable

e.g., path = root.a.b.c and level = 1, return root.a

参数:

path - path

level - level

抛出:

MetadataException

groupAlignedPaths

public static List<PartialPath> groupAlignedPaths(List<PartialPath> fullPaths)

PartialPath of aligned time series will be organized to one AlignedPath. BEFORE this method, all the aligned time series is NOT united. For example, given root.sg.d1.vector1[s1] and root.sg.d1.vector1[s2], they will be organized to root.sg.d1.vector1 [s1,s2]

参数:

fullPaths - full path list without uniting the sub measurement under the same aligned time series. The list has been sorted by the alphabetical order, so all the aligned time series of one device has already been placed contiguously.

返回:

Size of partial path list could NOT equal to the input list size. For example, the vector1 (s1,s2) would be returned once.

getMultiFullPaths

public static List<String> getMultiFullPaths(IMNode node)

collectLastNode

public static void collectLastNode(IMNode node,
                                   List<IMNode> lastNodeList)

groupAggregationsBySeries

public static Map<PartialPath,List<Integer>> groupAggregationsBySeries(List<? extends Path> selectedPaths)

Merge same series and convert to series map. For example: Given: paths: s1, s2, s3, s1 and aggregations: count, sum, count, sum. Then: pathToAggrIndexesMap: s1 -> 0, 3; s2 -> 1; s3 -> 2

参数:

selectedPaths - selected series

返回:

path to aggregation indexes map

groupAlignedSeriesWithAggregations

public static Map<AlignedPath,List<List<Integer>>> groupAlignedSeriesWithAggregations(Map<PartialPath,List<Integer>> pathToAggrIndexesMap)

Group all the series under an aligned entity into one AlignedPath and remove these series from pathToAggrIndexesMap. For example, input map: d1[s1] -> [1, 3], d1[s2] -> [2,4], will return d1[s1,s2], [[1,3], [2,4]]