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Java Source Code / Java Documentation » Ajax » zk » org.zkoss.xel

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Class Diagram

Java Document (Java Doc)

org.zkoss.xel .ExpressionFactory

All known Subclasses:   org.zkoss.xel.el .ELFactory,  org.zkoss.zkmax.xel.ognl .OGNLFactory,  org.zkoss.zkmax.xel.mvel .MVELFactory,  org.zkoss.zkmax.xel.el .ApacheELFactory,  org.zkoss.zkmax.xel.el21 .ApacheELFactory,
ExpressionFactory
public interface ExpressionFactory (Code)
Used to prepare expressions ( Expression ).
author:
   tomyeh
since:
   3.0.0

Field Summary
final public static int FEATURE_CLASS

final public static int FEATURE_FUNCTION


Method Summary
public Object evaluate(XelContext ctx, String expression, Class expectedType)
     Evaluates an expression.
public boolean isSupported(int feature)
     Returns whether an feature is supported.
public Expression parseExpression(XelContext ctx, String expression, Class expectedType)
     Prepares (aka., compiles) an expression.

Field Detail
FEATURE_CLASS
final public static int FEATURE_CLASS(Code)
Used with ExpressionFactory.isSupported to know whether the factory supports FunctionMapper.resolveClass

FEATURE_FUNCTION
final public static int FEATURE_FUNCTION(Code)
Used with ExpressionFactory.isSupported to know whether the factory supports FunctionMapper.resolveFunction

Method Detail
evaluate
public Object evaluate(XelContext ctx, String expression, Class expectedType) throws XelException(Code)
Evaluates an expression.
Parameters:
  ctx - the context information to evaluate an expression.It can be null, in which case no functions are supported for thisinvocation.
Parameters:
  expression - the expression to be evaluated.Note: the expression is enclosedwith ${ and }, regardingless what implemetnation is used.
Parameters:
  expectedType - the expected type of the result of the evaluation

isSupported
public boolean isSupported(int feature)(Code)
Returns whether an feature is supported.
Parameters:
  feature - which feature to query.It can be a combination of ExpressionFactory.FEATURE_FUNCTIONand ExpressionFactory.FEATURE_CLASS.

parseExpression
public Expression parseExpression(XelContext ctx, String expression, Class expectedType) throws XelException(Code)
Prepares (aka., compiles) an expression.
Parameters:
  ctx - the context infomation to prepare the expression.It can be null, in which case no functions are supported for thisinvocation.
Parameters:
  expression - the expression to be evaluated.
Parameters:
  expectedType - the expected type of the result of the evaluation

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