Package com.espertech.esper.common.internal.epl.rowrecog.core

Class RowRecogHelper

java.lang.Object

com.espertech.esper.common.internal.epl.rowrecog.core.RowRecogHelper

public class RowRecogHelper
extends Object

Helper for match recognize.

Field Summary

Fields

Modifier and Type	Field	Description
protected static final Comparator<RowRecogNFAStateEntry>	END_STATE_COMPARATOR

Constructor Summary

Constructors

Constructor	Description
RowRecogHelper()

Method Summary

Modifier and Type	Method	Description
protected static RowRecogNFAStrandResult	buildStartStates(RowRecogExprNode parent, Map<String,ExprNode> variableDefinitions, Map<String,Pair<Integer,Boolean>> variableStreams, boolean[] exprRequiresMultimatchState)	Build a list of start states from the parent node.
static Map<String,Set<String>>	determineVisibility(RowRecogExprNode pattern)
static RowRecogNFAViewService	recursiveFindRegexService(Viewable top)
static void	recursiveInspectVariables(RowRecogExprNode parent, boolean isMultiple, Set<String> variablesSingle, Set<String> variablesMultiple)	Inspect variables recursively.

Methods inherited from class java.lang.Object

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

Field Details

END_STATE_COMPARATOR

protected static final Comparator<RowRecogNFAStateEntry> END_STATE_COMPARATOR

Constructor Details

RowRecogHelper

public RowRecogHelper()

Method Details

recursiveFindRegexService

public static RowRecogNFAViewService recursiveFindRegexService(Viewable top)

recursiveInspectVariables

public static void recursiveInspectVariables(RowRecogExprNode parent,
 boolean isMultiple,
 Set<String> variablesSingle,
 Set<String> variablesMultiple)

Inspect variables recursively.

Parameters:

parent - parent regex expression node

isMultiple - if the variable in the stack is multiple of single

variablesSingle - single variables list

variablesMultiple - group variables list

buildStartStates

protected static RowRecogNFAStrandResult buildStartStates(RowRecogExprNode parent,
 Map<String,ExprNode> variableDefinitions,
 Map<String,Pair<Integer,Boolean>> variableStreams,
 boolean[] exprRequiresMultimatchState)

Build a list of start states from the parent node.

Parameters:

parent - to build start state for

variableDefinitions - each variable and its expressions

variableStreams - variable name and its stream number

exprRequiresMultimatchState - indicator whether multi-match state required

Returns:

strand of regex state nodes

determineVisibility

public static Map<String,Set<String>> determineVisibility(RowRecogExprNode pattern)