Package com.vaadin.util

Class ReflectTools

java.lang.Object

com.vaadin.util.ReflectTools

All Implemented Interfaces:

Serializable

public class ReflectTools
extends Object
implements Serializable

An util class with helpers for reflection operations. Used internally by Vaadin and should not be used by application developers. Subject to change at any time.

Since:

6.2

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
ReflectTools()

Method Summary

Modifier and Type	Method	Description
static Class<?>	convertPrimitiveType(Class<?> type)
static Method	findMethod(Class<?> cls, String methodName, Class<?>... parameterTypes)	Locates the method in the given class.
static Object	getJavaFieldValue(Object object, Field field)	Returns the value of the java field.
static Object	getJavaFieldValue(Object object, Field field, Class<?> propertyType)	Returns the value of the java field that is assignable to the property type.
static void	setJavaFieldValue(Object object, Field field, Object value)	Sets the value of a java field.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectTools

public ReflectTools()

Method Detail

findMethod

public static Method findMethod(Class<?> cls,
                                String methodName,
                                Class<?>... parameterTypes)
                         throws ExceptionInInitializerError

Locates the method in the given class. Returns null if the method is not found. Throws an ExceptionInInitializerError if there is a problem locating the method as this is mainly called from static blocks.

Parameters:

cls - Class that contains the method

methodName - The name of the method

parameterTypes - The parameter types for the method.

Returns:

A reference to the method

Throws:

ExceptionInInitializerError - Wraps any exception in an ExceptionInInitializerError so this method can be called from a static initializer.

getJavaFieldValue

public static Object getJavaFieldValue(Object object,
                                       Field field)
                                throws IllegalArgumentException,
                                       IllegalAccessException,
                                       InvocationTargetException

Returns the value of the java field.

Uses getter if present, otherwise tries to access even private fields directly.

Parameters:

object - The object containing the field

field - The field we want to get the value for

Returns:

The value of the field in the object

Throws:

InvocationTargetException - If the value could not be retrieved

IllegalAccessException - If the value could not be retrieved

IllegalArgumentException - If the value could not be retrieved

getJavaFieldValue

public static Object getJavaFieldValue(Object object,
                                       Field field,
                                       Class<?> propertyType)
                                throws IllegalArgumentException,
                                       IllegalAccessException,
                                       InvocationTargetException

Returns the value of the java field that is assignable to the property type.

Uses getter if a getter for the correct return type is present, otherwise tries to access even private fields directly. If the java field is not assignable to the property type throws an IllegalArgumentException.

Parameters:

object - The object containing the field

field - The field we want to get the value for

propertyType - The type the field must be assignable to

Returns:

The value of the field in the object

Throws:

InvocationTargetException - If the value could not be retrieved

IllegalAccessException - If the value could not be retrieved

IllegalArgumentException - If the value could not be retrieved

setJavaFieldValue

public static void setJavaFieldValue(Object object,
                                     Field field,
                                     Object value)
                              throws IllegalAccessException,
                                     IllegalArgumentException,
                                     InvocationTargetException

Sets the value of a java field.

Uses setter if present, otherwise tries to access even private fields directly.

Parameters:

object - The object containing the field

field - The field we want to set the value for

value - The value to set

Throws:

IllegalAccessException - If the value could not be assigned to the field

IllegalArgumentException - If the value could not be assigned to the field

InvocationTargetException - If the value could not be assigned to the field

convertPrimitiveType

public static Class<?> convertPrimitiveType(Class<?> type)

Since:

7.4