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

Class CollectorTraverser<T>

java.lang.Object

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

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

Direct Known Subclasses:

EntityCollector, MeasurementCollector, MNodeCollector, StorageGroupCollector

public abstract class CollectorTraverser<T>
extends Traverser

Field Summary

Fields

Modifier and Type	Field	Description
protected int	count
protected int	curOffset
protected boolean	hasLimit
protected int	limit
protected int	offset
protected T	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
CollectorTraverser(IMNode startNode, org.apache.iotdb.commons.path.PartialPath path, IMTreeStore store)
CollectorTraverser(IMNode startNode, org.apache.iotdb.commons.path.PartialPath path, IMTreeStore store, int limit, int offset)

Method Summary

Modifier and Type	Method	Description
int	getCurOffset()
T	getResult()	After invoke traverse(), this method could be invoked to get result
void	setLimit(int limit)
void	setOffset(int offset)
void	setResultSet(T resultSet)
protected void	traverse(IMNode node, int idx, int level)	extends traversal with limit restriction

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

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

Methods inherited from class java.lang.Object

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

Field Detail

limit

protected int limit

offset

protected int offset

hasLimit

protected boolean hasLimit

count

protected int count

curOffset

protected int curOffset

resultSet

protected T resultSet

Constructor Detail

CollectorTraverser

public CollectorTraverser(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

CollectorTraverser

public CollectorTraverser(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

traverse

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

extends traversal with limit restriction

Overrides:

traverse in class Traverser

Parameters:

node - current node that match the targetName in given path

idx - the index of targetName in given path

level - the level of current node in MTree

Throws:

org.apache.iotdb.commons.exception.MetadataException - some result process may throw MetadataException

getResult

public T getResult()

After invoke traverse(), this method could be invoked to get result

Returns:

the traversal result

setResultSet

public void setResultSet(T resultSet)

getCurOffset

public int getCurOffset()

setLimit

public void setLimit(int limit)

setOffset

public void setOffset(int offset)