com.espertech.esper.epl.core
Class ColumnNamedNodeSwapper

java.lang.Object
  com.espertech.esper.epl.core.ColumnNamedNodeSwapper

public class ColumnNamedNodeSwapper
extends java.lang.Object

A utility class for replacing select-clause column names with their definitions in expression node trees.

Constructor Summary

ColumnNamedNodeSwapper()

Method Summary

static ExprNode

swap(ExprNode exprTree, java.lang.String columnName, ExprNode fullExpr) Replace all instances of the node representing the colum name with the full expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnNamedNodeSwapper

public ColumnNamedNodeSwapper()

Method Detail

swap

public static ExprNode swap(ExprNode exprTree,
                            java.lang.String columnName,
                            ExprNode fullExpr)

Replace all instances of the node representing the colum name with the full expression.

Parameters:

exprTree - - the expression node tree to make the changes in

columnName - - the select-clause name that is to be expanded

fullExpr - - the full expression that the column name represents

Returns:

exprTree with the appropriate swaps performed, or fullExpr, if all of exprTree needed to be swapped