org.springframework.beans
Class BeanUtils

java.lang.Object
  org.springframework.beans.BeanUtils

public abstract class BeanUtils

extends java.lang.Object

Static convenience methods for JavaBeans, for instantiating beans, copying bean properties, etc.

Mainly for use within the framework, but to some degree also useful for application classes.

Version:

$Id: BeanUtils.java,v 1.15 2004/03/18 02:46:12 trisberg Exp $

Author:

Rod Johnson, Juergen Hoeller

Constructor Summary

BeanUtils()

Method Summary

static void	copyProperties(java.lang.Object source, java.lang.Object target) Copy the property values of the given source bean into the target bean.
static void	copyProperties(java.lang.Object source, java.lang.Object target, java.lang.String[] ignoreProperties) Copy the property values of the given source bean into the given target bean, ignoring the given ignoreProperties.
static java.lang.Object	instantiateClass(java.lang.Class clazz) Convenience method to instantiate a class using its no-arg constructor.
static java.lang.Object	instantiateClass(java.lang.reflect.Constructor constructor, java.lang.Object[] arguments) Convenience method to instantiate a class using the given constructor.
static boolean	isAssignable(java.lang.Class type, java.lang.Object value) Determine if the given type is assignable from the given value, assuming setting by reflection.
static boolean	isPrimitiveArray(java.lang.Class clazz) Check if the given class represents a primitive array, i.e. boolean, byte, char, short, int, long, float, or double.
static boolean	isPrimitiveWrapperArray(java.lang.Class clazz) Check if the given class represents an array of primitive wrappers, i.e.
static boolean	isSimpleProperty(java.lang.Class clazz) Check if the given class represents a "simple" property, i.e. a primitive, a String, a Class, or a corresponding array.

Methods inherited from class java.lang.Object

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

Constructor Detail

BeanUtils

public BeanUtils()

Method Detail

instantiateClass

public static java.lang.Object instantiateClass(java.lang.Class clazz)
                                         throws BeansException

Convenience method to instantiate a class using its no-arg constructor. As this method doesn't try to load classes by name, it should avoid class-loading issues.

Parameters:

clazz - class to instantiate

Returns:

the new instance

Throws:

BeansException

instantiateClass

public static java.lang.Object instantiateClass(java.lang.reflect.Constructor constructor,
                                                java.lang.Object[] arguments)
                                         throws BeansException

Convenience method to instantiate a class using the given constructor. As this method doesn't try to load classes by name, it should avoid class-loading issues.

Parameters:

constructor - constructor to instantiate

Returns:

the new instance

Throws:

BeansException

isAssignable

public static boolean isAssignable(java.lang.Class type,
                                   java.lang.Object value)

Determine if the given type is assignable from the given value, assuming setting by reflection. Considers primitive wrapper classes as assignable to the corresponding primitive types.

For example used in a bean factory's constructor resolution.

Parameters:

type - the target type

value - the value that should be assigned to the type

Returns:

if the type is assignable from the value

isSimpleProperty

public static boolean isSimpleProperty(java.lang.Class clazz)

Check if the given class represents a "simple" property, i.e. a primitive, a String, a Class, or a corresponding array. Used to determine properties to check for a "simple" dependency-check.

See Also:

RootBeanDefinition.DEPENDENCY_CHECK_SIMPLE, AbstractAutowireCapableBeanFactory.dependencyCheck(java.lang.String, org.springframework.beans.factory.support.RootBeanDefinition, org.springframework.beans.BeanWrapper, org.springframework.beans.PropertyValues)

isPrimitiveArray

public static boolean isPrimitiveArray(java.lang.Class clazz)

Check if the given class represents a primitive array, i.e. boolean, byte, char, short, int, long, float, or double.

isPrimitiveWrapperArray

public static boolean isPrimitiveWrapperArray(java.lang.Class clazz)

Check if the given class represents an array of primitive wrappers, i.e. Boolean, Byte, Character, Short, Integer, Long, Float, or Double.

copyProperties

public static void copyProperties(java.lang.Object source,
                                  java.lang.Object target)
                           throws java.lang.IllegalArgumentException,
                                  BeansException

Copy the property values of the given source bean into the target bean.

Parameters:

source - source bean

target - target bean

Throws:

java.lang.IllegalArgumentException - if the classes of source and target do not match

BeansException

copyProperties

public static void copyProperties(java.lang.Object source,
                                  java.lang.Object target,
                                  java.lang.String[] ignoreProperties)
                           throws java.lang.IllegalArgumentException,
                                  BeansException

Copy the property values of the given source bean into the given target bean, ignoring the given ignoreProperties.

Parameters:

source - source bean

target - target bean

ignoreProperties - array of property names to ignore

Throws:

java.lang.IllegalArgumentException - if the classes of source and target do not match

BeansException