com.espertech.esper.filter

Class FilterSpecCompilerMakeParamUtil

java.lang.Object

com.espertech.esper.filter.FilterSpecCompilerMakeParamUtil

public final class FilterSpecCompilerMakeParamUtil
extends Object

Helper to compile (validate and optimize) filter expressions as used in pattern and filter-based streams.

Constructor Summary

Constructors

Constructor and Description
FilterSpecCompilerMakeParamUtil()

Method Summary

Modifier and Type	Method and Description
protected static FilterSpecParam	makeFilterParam(ExprNode constituent, LinkedHashMap<String,Pair<EventType,String>> arrayEventTypes, ExprEvaluatorContext exprEvaluatorContext, String statementName) For a given expression determine if this is optimizable and create the filter parameter representing the expression, or null if not optimizable.
static ExprNode	rewriteOrToInIfApplicable(ExprNode constituent)

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterSpecCompilerMakeParamUtil

public FilterSpecCompilerMakeParamUtil()

Method Detail

makeFilterParam

protected static FilterSpecParam makeFilterParam(ExprNode constituent,
                                                 LinkedHashMap<String,Pair<EventType,String>> arrayEventTypes,
                                                 ExprEvaluatorContext exprEvaluatorContext,
                                                 String statementName)
                                          throws ExprValidationException

For a given expression determine if this is optimizable and create the filter parameter representing the expression, or null if not optimizable.

Parameters:

constituent - is the expression to look at

arrayEventTypes - event types that provide array values

statementName - statement name

exprEvaluatorContext - context

Returns:

filter parameter representing the expression, or null

Throws:

ExprValidationException - if the expression is invalid

rewriteOrToInIfApplicable

public static ExprNode rewriteOrToInIfApplicable(ExprNode constituent)