org.apache.tools.ant.util
Class ReflectUtil

java.lang.Object
  org.apache.tools.ant.util.ReflectUtil

public class ReflectUtil
extends java.lang.Object

Utility class to handle reflection on java objects. The class contains static methods to call reflection methods, catch any exceptions, converting them to BuildExceptions.

Method Summary

static java.lang.Object	getField(java.lang.Object obj, java.lang.String fieldName) Get the value of a field in an object.
static java.lang.Object	invoke(java.lang.Object obj, java.lang.String methodName) Call a method on the object with no parameters.
static java.lang.Object	invoke(java.lang.Object obj, java.lang.String methodName, java.lang.Class argType, java.lang.Object arg) Call a method on the object with one argument.
static java.lang.Object	invoke(java.lang.Object obj, java.lang.String methodName, java.lang.Class argType1, java.lang.Object arg1, java.lang.Class argType2, java.lang.Object arg2) Call a method on the object with two argument.
static void	throwBuildException(java.lang.Exception t) A method to convert an invocationTargetException to a buildexception and throw it.

Methods inherited from class java.lang.Object

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

Method Detail

invoke

public static java.lang.Object invoke(java.lang.Object obj,
                                      java.lang.String methodName)

Call a method on the object with no parameters.

Parameters:

obj - the object to invoke the method on.

methodName - the name of the method to call

Returns:

the object returned by the method

invoke

public static java.lang.Object invoke(java.lang.Object obj,
                                      java.lang.String methodName,
                                      java.lang.Class argType,
                                      java.lang.Object arg)

Call a method on the object with one argument.

Parameters:

obj - the object to invoke the method on.

methodName - the name of the method to call

argType - the type of argument.

arg - the value of the argument.

Returns:

the object returned by the method

invoke

public static java.lang.Object invoke(java.lang.Object obj,
                                      java.lang.String methodName,
                                      java.lang.Class argType1,
                                      java.lang.Object arg1,
                                      java.lang.Class argType2,
                                      java.lang.Object arg2)

Call a method on the object with two argument.

Parameters:

obj - the object to invoke the method on.

methodName - the name of the method to call

argType1 - the type of the first argument.

arg1 - the value of the first argument.

argType2 - the type of the second argument.

arg2 - the value of the second argument.

Returns:

the object returned by the method

getField

public static java.lang.Object getField(java.lang.Object obj,
                                        java.lang.String fieldName)
                                 throws BuildException

Get the value of a field in an object.

Parameters:

obj - the object to look at.

fieldName - the name of the field in the object.

Returns:

the value of the field.

Throws:

BuildException - if there is an error.

throwBuildException

public static void throwBuildException(java.lang.Exception t)
                                throws BuildException

A method to convert an invocationTargetException to a buildexception and throw it.

Parameters:

t - the invocation target exception.

Throws:

BuildException - the converted exception.