org.eclipse.persistence.sdo.helper.extension
Class OPStack

java.lang.Object
  org.eclipse.persistence.sdo.helper.extension.OPStack

public class OPStack
extends java.lang.Object

Utility class used for processing an XPath Expression into postfix notation. For example, consider the following expression: quantity=5 and (specialOrder='false' or productName='Lawnmower') The operations performed to create a postfix expression are: 1) add "quantity" to the list 2) push "=" onto the stack 3) add "5" to the list 4) pop "=" off the stack, and add to the list 5) push "and" onto the stack 6) push "(" onto the stack 7) add "specialOrder" to the list 8) push "=" onto the stack 9) add "'false'" to the list 10) pop "=" off the stack, and add to the list 11) push "or" onto the stack 12) add "productName" to the list 13) push "=" onto the stack 14) add "'Lawnmower'" to the list 15) pop "=" off the stack, and add to the list 16) pop "or" off the stack, and add to the list 17) push ")" onto the stack 18) pop "(" ")" pair off the stack 19) pop "and" off the stack, and add to the list The resulting postfix expression is: quantity 5 = specialOrder 'false' = productName 'Lawnmower' = or and

Constructor Summary

OPStack()
The default constructor initializes the stack and Token list.

Method Summary

java.util.List

processExpression(java.lang.String exp) Process an XPath Expression into postfix notation.

Methods inherited from class java.lang.Object

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

Constructor Detail

OPStack

public OPStack()

The default constructor initializes the stack and Token list.

Method Detail

processExpression

public java.util.List processExpression(java.lang.String exp)

Process an XPath Expression into postfix notation.

Parameters:

exp -

Returns: