com.espertech.esper.filter
Class FilterSpecCompilerMakeParamUtil

java.lang.Object
  com.espertech.esper.filter.FilterSpecCompilerMakeParamUtil

public final class FilterSpecCompilerMakeParamUtil
extends java.lang.Object

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

Constructor Summary

FilterSpecCompilerMakeParamUtil()

Method Summary

protected static FilterSpecParam	makeFilterParam(ExprNode constituent, java.util.LinkedHashMap<java.lang.String,Pair<EventType,java.lang.String>> arrayEventTypes, ExprEvaluatorContext exprEvaluatorContext, java.lang.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,
                                                 java.util.LinkedHashMap<java.lang.String,Pair<EventType,java.lang.String>> arrayEventTypes,
                                                 ExprEvaluatorContext exprEvaluatorContext,
                                                 java.lang.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 - @return filter parameter representing the expression, or null

Returns:

FilterSpecParam filter param

Throws:

ExprValidationException - if the expression is invalid

rewriteOrToInIfApplicable

public static ExprNode rewriteOrToInIfApplicable(ExprNode constituent)