Package org.apache.iotdb.db.metadata.mtree.traverser.counter

Class MNodeLevelCounter

java.lang.Object

org.apache.iotdb.db.metadata.mtree.traverser.Traverser

org.apache.iotdb.db.metadata.mtree.traverser.counter.CounterTraverser

org.apache.iotdb.db.metadata.mtree.traverser.counter.MNodeLevelCounter

Direct Known Subclasses:

MNodeAboveSGLevelCounter

public class MNodeLevelCounter
extends CounterTraverser

This Traverser implements node count function. On finding a path matching the given pattern, if the path is longer than the specified level, MNodeLevelCounter finds the node of the specified level on the path and counts it. The same node will not be counted more than once.

Field Summary

Fields

Modifier and Type	Field	Description
protected int	targetLevel

Fields inherited from class org.apache.iotdb.db.metadata.mtree.traverser.counter.CounterTraverser

count

Fields inherited from class org.apache.iotdb.db.metadata.mtree.traverser.Traverser

isInTemplate, isPrefixMatch, isPrefixStart, nodes, shouldTraverseTemplate, startIndex, startLevel, startNode, store, templateMap, traverseContext

Constructor Summary

Constructors

Constructor	Description
MNodeLevelCounter(IMNode startNode, org.apache.iotdb.commons.path.PartialPath path, IMTreeStore store, int targetLevel)

Method Summary

Modifier and Type	Method	Description
protected boolean	processFullMatchedMNode(IMNode node, int idx, int level)	full match: root.sg.d full match root.sg.**(pattern)
protected boolean	processInternalMatchedMNode(IMNode node, int idx, int level)	internal match: root.sg internal match root.sg.**(pattern)

Methods inherited from class org.apache.iotdb.db.metadata.mtree.traverser.counter.CounterTraverser

getCount

Methods inherited from class org.apache.iotdb.db.metadata.mtree.traverser.Traverser

getCurrentPartialPath, getCurrentPathNodes, getStorageGroupNodeInTraversePath, getUpperTemplate, processMultiLevelWildcard, processNameMatch, processOneLevelWildcard, setPrefixMatch, setTemplateMap, traverse, traverse

Methods inherited from class java.lang.Object

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

Field Detail

targetLevel

protected int targetLevel

Constructor Detail

MNodeLevelCounter

public MNodeLevelCounter(IMNode startNode,
                         org.apache.iotdb.commons.path.PartialPath path,
                         IMTreeStore store,
                         int targetLevel)
                  throws org.apache.iotdb.commons.exception.MetadataException

Throws:

org.apache.iotdb.commons.exception.MetadataException

Method Detail

processInternalMatchedMNode

protected boolean processInternalMatchedMNode(IMNode node,
                                              int idx,
                                              int level)

Description copied from class: Traverser

internal match: root.sg internal match root.sg.**(pattern)

Specified by:

processInternalMatchedMNode in class Traverser

Returns:

whether this branch of recursive traversal should stop; if true, stop

processFullMatchedMNode

protected boolean processFullMatchedMNode(IMNode node,
                                          int idx,
                                          int level)

Description copied from class: Traverser

full match: root.sg.d full match root.sg.**(pattern)

Specified by:

processFullMatchedMNode in class Traverser

Returns:

whether this branch of recursive traversal should stop; if true, stop