er.extensions.foundation
Class ERXBooleanExpressionParser

java.lang.Object
  er.extensions.foundation.ERXBooleanExpressionParser

public class ERXBooleanExpressionParser
extends java.lang.Object

Parses a boolean expression and evaluates that boolean expression against a valueProvider object that returns boolean values for the variable symbols found in the boolean expression. The valueProvider object must implement NSKeyValueCodingAdditions interface. Acceptable boolean expressions can use the words AND, OR and NOT in upper, lower or mixed case. Parentheses can be used as needed to group elements of the expression. Variable symbols in the boolean expression can use characters and formatting of typical keys or keyPaths. All other words besides AND, OR and NOT are assumed to be variables (aka keyPaths) which resolve to Boolean values when valueForKeyPath is invoked on the valueProvider object (which can be a NSDictionary of variable values or any object that implements NSKeyValueCodingAdditions) For example Expression: (canViewPerson AND canEditPerson) OR (isTheBoss AND NOT account.isAccountDisabled)

Author:

kieran

Constructor Summary

ERXBooleanExpressionParser(java.lang.String expression)

Method Summary

boolean	evaluateWithObject(com.webobjects.foundation.NSKeyValueCodingAdditions valueProvider)
com.webobjects.eocontrol.EOQualifier	qualifier()
java.lang.String	toDebugString()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ERXBooleanExpressionParser

public ERXBooleanExpressionParser(java.lang.String expression)

Method Detail

evaluateWithObject

public boolean evaluateWithObject(com.webobjects.foundation.NSKeyValueCodingAdditions valueProvider)

Returns:

the result of the boolean expression when evaluated with valueProvider

qualifier

public com.webobjects.eocontrol.EOQualifier qualifier()

Returns:

the EOQualifier resulting from the boolean expression. Leaving this as public since it is useful for debugging the expression morphing in WOComponents

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toDebugString

public java.lang.String toDebugString()