org.eclipse.xtext.xbase.lib.util
Class ReflectExtensions

java.lang.Object
  org.eclipse.xtext.xbase.lib.util.ReflectExtensions

@Beta
public class ReflectExtensions
extends Object

Extension methods to simplify reflective invocation of methods and fields.

Since:

2.3

Author:

Sven Efftinge - Initial contribution and API

Constructor Summary

ReflectExtensions()

Method Summary

<T> T	get(Object receiver, String fieldName) Retrieves the value of the given accessible field of the given receiver.
Object	invoke(Object receiver, String methodName, Object... args) Invokes the first accessible method defined on the receiver'c class with the given name and a parameter list compatible to the given arguments.
void	set(Object receiver, String fieldName, Object value) Sets the given value on an the receivers's accessible field with the given name.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectExtensions

public ReflectExtensions()

Method Detail

set

public void set(Object receiver,
                String fieldName,
                Object value)
         throws SecurityException,
                NoSuchFieldException,
                IllegalArgumentException,
                IllegalAccessException

Sets the given value on an the receivers's accessible field with the given name.

Parameters:

receiver - the receiver, never null

fieldName - the field's name, never null

value - the value to set

Throws:

NoSuchFieldException - see Class.getField(String)

SecurityException - see Class.getField(String)

IllegalAccessException - see Field.set(Object, Object)

IllegalArgumentException - see Field.set(Object, Object)

get

public <T> T get(Object receiver,
                 String fieldName)
      throws SecurityException,
             NoSuchFieldException,
             IllegalArgumentException,
             IllegalAccessException

Retrieves the value of the given accessible field of the given receiver.

Parameters:

receiver - the container of the field, not null

fieldName - the field's name, not null

Returns:

the value of the field

Throws:

NoSuchFieldException - see Class.getField(String)

SecurityException - see Class.getField(String)

IllegalAccessException - see Field.get(Object)

IllegalArgumentException - see Field.get(Object)

invoke

public Object invoke(Object receiver,
                     String methodName,
                     Object... args)
              throws SecurityException,
                     IllegalArgumentException,
                     IllegalAccessException,
                     InvocationTargetException,
                     NoSuchMethodException

Invokes the first accessible method defined on the receiver'c class with the given name and a parameter list compatible to the given arguments.

Parameters:

receiver - the method call receiver, not null

methodName - the method name, not null

args - the arguments for the method invocation

Returns:

the result of the method invocation. null if the method was of type void.

Throws:

SecurityException - see Class.getMethod(String, Class...)

NoSuchMethodException - see Class.getMethod(String, Class...)

IllegalAccessException - see Method.invoke(Object, Object...)

IllegalArgumentException - see Method.invoke(Object, Object...)

InvocationTargetException - see Method.invoke(Object, Object...)