com.espertech.esper.pattern

Class PatternExpressionUtil

java.lang.Object

com.espertech.esper.pattern.PatternExpressionUtil

public class PatternExpressionUtil
extends Object

Utility for evaluating pattern expressions.

Constructor Summary

Constructors

Constructor and Description
PatternExpressionUtil()

Method Summary

Modifier and Type	Method and Description
static Object	evaluate(String objectName, MatchedEventMap beginState, ExprNode parameter, MatchedEventConvertor convertor, ExprEvaluatorContext exprEvaluatorContext)
static List<Object>	evaluate(String objectName, MatchedEventMap beginState, List<ExprNode> parameters, MatchedEventConvertor convertor, ExprEvaluatorContext exprEvaluatorContext) Ctor.
static Object	evaluateTimePeriod(String objectName, MatchedEventMap beginState, ExprTimePeriod timePeriod, MatchedEventConvertor convertor, ExprEvaluatorContext exprEvaluatorContext) Evaluate the pattern expression.
static Object	getKeys(MatchedEventMap matchEvent, MatchedEventConvertor convertor, ExprEvaluator[] expressions, AgentInstanceContext agentInstanceContext)
static void	toPrecedenceFreeEPL(StringWriter writer, String delimiterText, List<EvalFactoryNode> childNodes, PatternExpressionPrecedenceEnum precedence)

Methods inherited from class java.lang.Object

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

Constructor Detail

PatternExpressionUtil

public PatternExpressionUtil()

Method Detail

getKeys

public static Object getKeys(MatchedEventMap matchEvent,
                             MatchedEventConvertor convertor,
                             ExprEvaluator[] expressions,
                             AgentInstanceContext agentInstanceContext)

evaluate

public static List<Object> evaluate(String objectName,
                                    MatchedEventMap beginState,
                                    List<ExprNode> parameters,
                                    MatchedEventConvertor convertor,
                                    ExprEvaluatorContext exprEvaluatorContext)
                             throws EPException

Ctor.

Parameters:

objectName - is the pattern object name

beginState - the pattern begin state

parameters - object parameters

convertor - for converting to a event-per-stream view for use to evaluate expressions

exprEvaluatorContext - expression evaluation context

Returns:

expression results

Throws:

EPException - if the evaluate failed

evaluateTimePeriod

public static Object evaluateTimePeriod(String objectName,
                                        MatchedEventMap beginState,
                                        ExprTimePeriod timePeriod,
                                        MatchedEventConvertor convertor,
                                        ExprEvaluatorContext exprEvaluatorContext)
                                 throws EPException

Evaluate the pattern expression.

Parameters:

objectName - pattern object name

beginState - pattern state

convertor - to converting from pattern match to event-per-stream

exprEvaluatorContext - expression evaluation context

timePeriod - time period

Returns:

evaluation result

Throws:

EPException - if the evaluation failed

evaluate

public static Object evaluate(String objectName,
                              MatchedEventMap beginState,
                              ExprNode parameter,
                              MatchedEventConvertor convertor,
                              ExprEvaluatorContext exprEvaluatorContext)
                       throws EPException

Throws:

EPException

toPrecedenceFreeEPL

public static void toPrecedenceFreeEPL(StringWriter writer,
                                       String delimiterText,
                                       List<EvalFactoryNode> childNodes,
                                       PatternExpressionPrecedenceEnum precedence)