org.zkoss.xel
Interface ExpressionFactory

All Known Implementing Classes:
ApacheELFactory, ApacheELFactory, BindXelFactory, ELFactory, ELFactory, MVELFactory, OGNLFactory

public interface ExpressionFactory

Used to prepare expressions (Expression).

Since:
3.0.0
Author:
tomyeh

Field Summary
static int FEATURE_CLASS
          Used with isSupported(int) to know whether the factory supports FunctionMapperExt.resolveClass(java.lang.String)
static int FEATURE_FUNCTION
          Used with isSupported(int) to know whether the factory supports FunctionMapper.resolveFunction(java.lang.String, java.lang.String)
 
Method Summary
 java.lang.Object evaluate(XelContext ctx, java.lang.String expression, java.lang.Class<?> expectedType)
          Evaluates an expression.
 boolean isSupported(int feature)
          Returns whether an feature is supported.
 Expression parseExpression(XelContext ctx, java.lang.String expression, java.lang.Class<?> expectedType)
          Prepares (aka., compiles) an expression.
 

Field Detail

FEATURE_FUNCTION

static final int FEATURE_FUNCTION
Used with isSupported(int) to know whether the factory supports FunctionMapper.resolveFunction(java.lang.String, java.lang.String)

See Also:
Constant Field Values

FEATURE_CLASS

static final int FEATURE_CLASS
Used with isSupported(int) to know whether the factory supports FunctionMapperExt.resolveClass(java.lang.String)

See Also:
Constant Field Values
Method Detail

isSupported

boolean isSupported(int feature)
Returns whether an feature is supported.

Parameters:
feature - which feature to query. It can be a combination of FEATURE_FUNCTION and FEATURE_CLASS.

parseExpression

Expression parseExpression(XelContext ctx,
                           java.lang.String expression,
                           java.lang.Class<?> expectedType)
                           throws XelException
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 this invocation.
expression - the expression to be evaluated.
expectedType - the expected type of the result of the evaluation
Throws:
XelException

evaluate

java.lang.Object evaluate(XelContext ctx,
                          java.lang.String expression,
                          java.lang.Class<?> expectedType)
                          throws XelException
Evaluates an expression.

Parameters:
ctx - the context information to evaluate an expression. It can be null, in which case no functions are supported for this invocation.
expression - the expression to be evaluated. Note: the expression is enclosed with ${ and }, regardingless what implemetnation is used.
expectedType - the expected type of the result of the evaluation
Throws:
XelException


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