Package org.zkoss.xel.util

Class MethodFunction

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, Function
    public class MethodFunction
extends SerializableMethod
implements Function
    A XEL function based on java.lang.reflect.Method. It is used by implementation of ExpressionFactory The user of XEL expressions rarely need it.
    Since:
    3.0.0
    Author:
    tomyeh
    See Also:
    Serialized Form

    • Constructor Summary

      Constructors 
      Constructor Description
      MethodFunction​(java.lang.reflect.Method method)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.Class<?>[] getParameterTypes()
      Returns an array of Class objects that represent the formal parameter types, in declaration order, of the method represented by this Method object.
      java.lang.Class<?> getReturnType()
      Returns a Class object that represents the formal return type of the method represented by this Method object.
      java.lang.Object invoke​(java.lang.Object obj, java.lang.Object... args)
      Invokes this method with the specified arguments.
      java.lang.reflect.Method toMethod()
      Converts this function to a method, or null if unable to convert.

      • Methods inherited from class java.lang.Object

        finalize, getClass, notify, notifyAll, wait, wait, wait

    • Constructor Detail

      • MethodFunction

        public MethodFunction​(java.lang.reflect.Method method)

    • Method Detail

      • getParameterTypes

        public java.lang.Class<?>[] getParameterTypes()
        Description copied from interface: Function
        Returns an array of Class objects that represent the formal parameter types, in declaration order, of the method represented by this Method object.

        Returns an array of length 0 if the underlying method takes no parameters.

        Specified by:
        getParameterTypes in interface Function

      • getReturnType

        public java.lang.Class<?> getReturnType()
        Description copied from interface: Function
        Returns a Class object that represents the formal return type of the method represented by this Method object.
        Specified by:
        getReturnType in interface Function

      • invoke

        public java.lang.Object invoke​(java.lang.Object obj,
                               java.lang.Object... args)
                        throws java.lang.Exception
        Description copied from interface: Function
        Invokes this method with the specified arguments.
        Specified by:
        invoke in interface Function
        Parameters:
        obj - the object the underlying method is invoked from. It is always null if this function is invoked in an XEL expression. It is reserved for more sophisticated expressions, such as ZK Spreadsheet's expressions.
        args - the arguments used for the method call. If null, an Object array with zero length is assumed.
        Throws:
        java.lang.Exception

      • toMethod

        public java.lang.reflect.Method toMethod()
        Description copied from interface: Function
        Converts this function to a method, or null if unable to convert.
        Specified by:
        toMethod in interface Function