Package org.zkoss.zel

Class MethodExpression

java.lang.Object

org.zkoss.zel.Expression

org.zkoss.zel.MethodExpression

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

MethodExpressionImpl, MethodExpressionLiteral

public abstract class MethodExpression
extends Expression

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
MethodExpression()

Method Summary

Modifier and Type	Method	Description
abstract MethodInfo	getMethodInfo(ELContext context)
abstract java.lang.Object	invoke(ELContext context, java.lang.Object[] params)
boolean	isParametersProvided()

Methods inherited from class org.zkoss.zel.Expression

equals, getExpressionString, hashCode, isLiteralText

Methods inherited from class java.lang.Object

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

Constructor Detail

MethodExpression

public MethodExpression()

Method Detail

getMethodInfo

public abstract MethodInfo getMethodInfo(ELContext context)

Parameters:

context - The EL context for this evaluation

Returns:

Information about the method that this expression resolves to

Throws:

java.lang.NullPointerException - If the supplied context is null

PropertyNotFoundException - If a property/variable resolution failed because no match was found or a match was found but was not readable

MethodNotFoundException - If no matching method can be found

ELException - Wraps any exception throw whilst resolving the property

invoke

public abstract java.lang.Object invoke(ELContext context,
                                        java.lang.Object[] params)

Parameters:

context - The EL context for this evaluation

params - The parameters with which to invoke this method expression

Returns:

The result of invoking this method expression

Throws:

java.lang.NullPointerException - If the supplied context is null

PropertyNotFoundException - If a property/variable resolution failed because no match was found or a match was found but was not readable

MethodNotFoundException - If no matching method can be found

ELException - Wraps any exception throw whilst resolving the property or coercion of the result to the expected return type fails

isParametersProvided

public boolean isParametersProvided()

Returns:

This default implementation always returns false

Since:

EL 3.0