Package org.apache.bsf.util
Class ReflectionUtils
java.lang.Object
org.apache.bsf.util.ReflectionUtils
This file is a collection of reflection utilities. There are utilities
for creating beans, getting bean infos, setting/getting properties,
and binding events.
- Author:
- Sanjiva Weerawarana, Joseph Kesselman
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic 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
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.
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Constructor Details
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ReflectionUtils
public ReflectionUtils()
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Method Details
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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 sourceeventSetName
- name of event set from event src to bind toprocessor
- event processor the event should be delegated to when it occurs; either via processEvent or processExceptionableEvent.- Throws:
IntrospectionException
- if unable to introspectIllegalArgumentException
- if event set is unknownIllegalAccessException
- if the event adapter class or initializer is not accessible.InstantiationException
- if event adapter instantiation failsInvocationTargetException
- if something goes wrong while running add event listener method
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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:
cld
- the class loader to use. If null, Class.forName is used.className
- name of class to instantiateargTypes
- array of argument typesargs
- array of arguments- Returns:
- the newly created bean
- Throws:
ClassNotFoundException
- if class is not loadedNoSuchMethodException
- if constructor can't be foundInstantiationException
- if class can't be instantiatedIllegalAccessException
- if class is not accessibleIllegalArgumentException
- if argument problemInvocationTargetException
- if constructor exceptedIOException
- if I/O error in beans.instantiate
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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:
cld
- the class loader to use. If null, Class.forName is used.className
- name of class to instantiateargs
- array of arguments- Returns:
- the newly created bean
- Throws:
ClassNotFoundException
- if class is not loadedNoSuchMethodException
- if constructor can't be foundInstantiationException
- if class can't be instantiatedIllegalAccessException
- if class is not accessibleIllegalArgumentException
- if argument problemInvocationTargetException
- if constructor exceptedIOException
- if I/O error in beans.instantiate
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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 gottenpropName
- name of the property to setindex
- index to get (if property is indexed)- Throws:
IntrospectionException
- if unable to introspectIllegalArgumentException
- if problems with args: if the property is unknown, or if the property is given an index when its not, or if the property is not writeable, or if the given value cannot be assigned to the it (type mismatch).IllegalAccessException
- if read method is not accessibleInvocationTargetException
- if read method excepts
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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 setpropName
- name of the property to setindex
- index to set (if property is indexed)value
- the property valuevalueType
- the type of the above (needed when its null)tcr
- type convertor registry to use to convert value type to property type if necessary- Throws:
IntrospectionException
- if unable to introspectIllegalArgumentException
- if problems with args: if the property is unknown, or if the property is given an index when its not, or if the property is not writeable, or if the given value cannot be assigned to the it (type mismatch).IllegalAccessException
- if write method is not accessibleInvocationTargetException
- if write method excepts
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