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

Class MeasurementCollector<T>

java.lang.Object

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

org.apache.iotdb.db.metadata.mtree.traverser.collector.CollectorTraverser<T>

org.apache.iotdb.db.metadata.mtree.traverser.collector.MeasurementCollector<T>

public abstract class MeasurementCollector<T>
extends CollectorTraverser<T>

Field Summary

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

count, curOffset, hasLimit, limit, offset, resultSet

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
MeasurementCollector(IMNode startNode, org.apache.iotdb.commons.path.PartialPath path, IMTreeStore store)
MeasurementCollector(IMNode startNode, org.apache.iotdb.commons.path.PartialPath path, IMTreeStore store, int limit, int offset)

Method Summary

Modifier and Type	Method	Description
protected abstract void	collectMeasurement(IMeasurementMNode node)	collect the information of one measurement
protected MeasurementPath	getCurrentMeasurementPathInTraverse(IMeasurementMNode currentNode)	When traverse goes into a template, IMNode.getPartialPath may not work as nodes in template has no parent on MTree.
protected boolean	isUnderAlignedEntity()
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.collector.CollectorTraverser

getCurOffset, getResult, setLimit, setOffset, setResultSet, traverse

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

MeasurementCollector

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

Throws:

org.apache.iotdb.commons.exception.MetadataException

MeasurementCollector

public MeasurementCollector(IMNode startNode,
                            org.apache.iotdb.commons.path.PartialPath path,
                            IMTreeStore store,
                            int limit,
                            int offset)
                     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)
                                       throws org.apache.iotdb.commons.exception.MetadataException

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

Throws:

org.apache.iotdb.commons.exception.MetadataException

processFullMatchedMNode

protected boolean processFullMatchedMNode(IMNode node,
                                          int idx,
                                          int level)
                                   throws org.apache.iotdb.commons.exception.MetadataException

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

Throws:

org.apache.iotdb.commons.exception.MetadataException

collectMeasurement

protected abstract void collectMeasurement(IMeasurementMNode node)
                                    throws org.apache.iotdb.commons.exception.MetadataException

collect the information of one measurement

Parameters:

node - MeasurementMNode holding the measurement schema

Throws:

org.apache.iotdb.commons.exception.MetadataException

getCurrentMeasurementPathInTraverse

protected MeasurementPath getCurrentMeasurementPathInTraverse(IMeasurementMNode currentNode)

When traverse goes into a template, IMNode.getPartialPath may not work as nodes in template has no parent on MTree. So this methods will construct a path from root to node in template using a stack traverseContext.

isUnderAlignedEntity

protected boolean isUnderAlignedEntity()