org.apache.bsf.util

Class ReflectionUtils


public class ReflectionUtils
extends java.lang.Object

This file is a collection of reflection utilities. There are utilities for creating beans, getting bean infos, setting/getting properties, and binding events.
Authors:
Sanjiva Weerawarana
Joseph Kesselman

Method Summary

static void
addEventListener(Object source, String eventSetName, EventProcessor processor)
Add an event processor as a listener to some event coming out of an object.
static Bean
createBean(ClassLoader cld, String className, Class[] argTypes, Object[] args)
Create a bean using given class loader and using the appropriate constructor for the given args of the given arg types.
static Bean
createBean(ClassLoader cld, String className, Object[] args)
Create a bean using given class loader and using the appropriate constructor for the given args.
static Bean
getField(Object target, String fieldName)
static Bean
getProperty(Object target, String propName, Integer index)
Get a property of a bean.
static void
setField(Object target, String fieldName, Bean value, TypeConvertorRegistry tcr)
static void
setProperty(Object target, String propName, Integer index, Object value, Class valueType, TypeConvertorRegistry tcr)
Set a property of a bean to a given value.

Method Details

addEventListener

public static void addEventListener(Object source,
                                    String eventSetName,
                                    EventProcessor processor)
            throws IntrospectionException,
                   IllegalArgumentException,
                   IllegalAccessException,
                   InstantiationException,
                   InvocationTargetException
Add an event processor as a listener to some event coming out of an object.
Parameters:
source - event source
eventSetName - name of event set from event src to bind to
processor - event processor the event should be delegated to when it occurs; either via processEvent or processExceptionableEvent.

createBean

public static Bean createBean(ClassLoader cld,
                              String className,
                              Class[] argTypes,
                              Object[] args)
            throws ClassNotFoundException,
                   NoSuchMethodException,
                   InstantiationException,
                   IllegalAccessException,
                   IllegalArgumentException,
                   InvocationTargetException,
                   IOException
Create a bean using given class loader and using the appropriate constructor for the given args of the given arg types.
Parameters:
className - name of class to instantiate
argTypes - array of argument types
args - array of arguments
Returns:
the newly created bean

createBean

public static Bean createBean(ClassLoader cld,
                              String className,
                              Object[] args)
            throws ClassNotFoundException,
                   NoSuchMethodException,
                   InstantiationException,
                   IllegalAccessException,
                   IllegalArgumentException,
                   InvocationTargetException,
                   IOException
Create a bean using given class loader and using the appropriate constructor for the given args. Figures out the arg types and calls above.
Parameters:
className - name of class to instantiate
args - array of arguments
Returns:
the newly created bean

getField

public static Bean getField(Object target,
                            String fieldName)
            throws IllegalArgumentException,
                   IllegalAccessException

getProperty

public static Bean getProperty(Object target,
                               String propName,
                               Integer index)
            throws IntrospectionException,
                   IllegalArgumentException,
                   IllegalAccessException,
                   InvocationTargetException
Get a property of a bean.
Parameters:
target - the object whose prop is to be gotten
propName - name of the property to set
index - index to get (if property is indexed)

setField

public static void setField(Object target,
                            String fieldName,
                            Bean value,
                            TypeConvertorRegistry tcr)
            throws IllegalArgumentException,
                   IllegalAccessException

setProperty

public static void setProperty(Object target,
                               String propName,
                               Integer index,
                               Object value,
                               Class valueType,
                               TypeConvertorRegistry tcr)
            throws IntrospectionException,
                   IllegalArgumentException,
                   IllegalAccessException,
                   InvocationTargetException
Set a property of a bean to a given value.
Parameters:
target - the object whose prop is to be set
propName - name of the property to set
index - index to set (if property is indexed)
value - the property value
valueType - the type of the above (needed when its null)
tcr - type convertor registry to use to convert value type to property type if necessary