Package org.apache.iotdb.db.metadata.utils

Class MetaUtils

  • public class MetaUtils
extends java.lang.Object

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static void collectLastNode​(IMNode node, java.util.List<IMNode> lastNodeList)  
      static java.util.List<java.lang.String> getMultiFullPaths​(IMNode node)  
      static org.apache.iotdb.commons.path.PartialPath getStorageGroupPathByLevel​(org.apache.iotdb.commons.path.PartialPath path, int level)
      Get storage group path when creating schema automatically is enable
      static java.util.Map<org.apache.iotdb.commons.path.PartialPath,​java.util.List<java.lang.Integer>> groupAggregationsBySeries​(java.util.List<? extends org.apache.iotdb.tsfile.read.common.Path> selectedPaths)
      Merge same series and convert to series map.
      static java.util.Map<org.apache.iotdb.commons.path.PartialPath,​java.util.List<AggregationDescriptor>> groupAlignedAggregations​(java.util.Map<org.apache.iotdb.commons.path.PartialPath,​java.util.List<AggregationDescriptor>> pathToAggregations)  
      static java.util.List<org.apache.iotdb.commons.path.PartialPath> groupAlignedPaths​(java.util.List<org.apache.iotdb.commons.path.PartialPath> fullPaths)
      PartialPath of aligned time series will be organized to one AlignedPath.
      static java.util.List<org.apache.iotdb.commons.path.PartialPath> groupAlignedSeries​(java.util.List<org.apache.iotdb.commons.path.PartialPath> fullPaths)  
      static java.util.Map<AlignedPath,​java.util.List<java.util.List<java.lang.Integer>>> groupAlignedSeriesWithAggregations​(java.util.Map<org.apache.iotdb.commons.path.PartialPath,​java.util.List<java.lang.Integer>> pathToAggrIndexesMap)
      Group all the series under an aligned entity into one AlignedPath and remove these series from pathToAggrIndexesMap.

      • Methods inherited from class java.lang.Object

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

    • Method Detail

      • getStorageGroupPathByLevel

        public static org.apache.iotdb.commons.path.PartialPath getStorageGroupPathByLevel​(org.apache.iotdb.commons.path.PartialPath path,
                                                                                   int level)
                                                                            throws org.apache.iotdb.commons.exception.MetadataException
        Get storage group path when creating schema automatically is enable

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

        Parameters:
        path - path
        level - level
        Throws:
        org.apache.iotdb.commons.exception.MetadataException

      • groupAlignedPaths

        public static java.util.List<org.apache.iotdb.commons.path.PartialPath> groupAlignedPaths​(java.util.List<org.apache.iotdb.commons.path.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]
        Parameters:
        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.
        Returns:
        Size of partial path list could NOT equal to the input list size. For example, the vector1 (s1,s2) would be returned once.

      • groupAlignedSeries

        public static java.util.List<org.apache.iotdb.commons.path.PartialPath> groupAlignedSeries​(java.util.List<org.apache.iotdb.commons.path.PartialPath> fullPaths)

      • getMultiFullPaths

        public static java.util.List<java.lang.String> getMultiFullPaths​(IMNode node)

      • collectLastNode

        public static void collectLastNode​(IMNode node,
                                   java.util.List<IMNode> lastNodeList)

      • groupAggregationsBySeries

        public static java.util.Map<org.apache.iotdb.commons.path.PartialPath,​java.util.List<java.lang.Integer>> groupAggregationsBySeries​(java.util.List<? extends org.apache.iotdb.tsfile.read.common.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
        Parameters:
        selectedPaths - selected series
        Returns:
        path to aggregation indexes map

      • groupAlignedSeriesWithAggregations

        public static java.util.Map<AlignedPath,​java.util.List<java.util.List<java.lang.Integer>>> groupAlignedSeriesWithAggregations​(java.util.Map<org.apache.iotdb.commons.path.PartialPath,​java.util.List<java.lang.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]]

      • groupAlignedAggregations

        public static java.util.Map<org.apache.iotdb.commons.path.PartialPath,​java.util.List<AggregationDescriptor>> groupAlignedAggregations​(java.util.Map<org.apache.iotdb.commons.path.PartialPath,​java.util.List<AggregationDescriptor>> pathToAggregations)