com.neurosys.utils

Class BeanUtils

java.lang.Object

com.neurosys.utils.BeanUtils

public class BeanUtils
extends Object

Utility methods for Context and bean related stuff

Author:

Arjun Dhar

Constructor Summary

Constructors

Constructor and Description
BeanUtils()

Method Summary

Modifier and Type	Method and Description
static Field[]	filter(Field[] fields, boolean includeStatic, boolean inclSubClasForComparison, Class... typesToInclude) Filter array Fields and if a specific list of Types is provided then restrict the output to that type/Class of Field only.
static Set<Class>	getClassesInPackage(Class parentClass, String packagePath, Consumer<? super org.springframework.beans.factory.config.BeanDefinition> consumer)
static Field	getDeclaredField(Class c, String name) Get a field for the Class or return null
static Field[]	getDeclaredFields(Class c) Get Class.getDeclaredFields() for the class and its parents Will contain all static and non-static fields of all visibility.
static <T> T	getPreferredBean(Class<T> type, String preferredName, org.springframework.context.ApplicationContext context, Exception incaseCantFindException) A utility method to select the Bean from the context right for the job Use then when there are situations of multi module configurations which may supply the context with multiple or no beans of the given type.
static <T> T	getPreferredBean(Class<T> type, String preferredName, org.springframework.context.ApplicationContext context, String incaseCantFindException) A utility method to select the Bean from the context right for the job Use then when there are situations of multi module configurations which may supply the context with multiple or no beans of the given type.
static <E extends Throwable> E	getRootCause(E source, Integer maxDepth) Get innermost cause upto maxDepth level.
static boolean	isStatic(Field f) Check if a Field is static or not
static boolean	isValidOrPrimitiveFieldType(Class<?> type) If primitive, String, Date or Calendar type, will return true
static boolean	unwrapAndSearchExceptions(Throwable source, Class<? extends Exception>... exceptions) Unwrap and trap Exceptions of the desired type.

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

getPreferredBean

public static <T> T getPreferredBean(Class<T> type,
                                     String preferredName,
                                     org.springframework.context.ApplicationContext context,
                                     Exception incaseCantFindException)

A utility method to select the Bean from the context right for the job
Use then when there are situations of multi module configurations which may supply the context with multiple or no beans of the given type.

Type Parameters:

T - Type of being searched for

Parameters:

type - as Class

preferredName - as String (name of bean that will be preferred if there are multiple beans)

context - as ApplicationContext

incaseCantFindException - as Exception

Returns:

@nullable true

getPreferredBean

public static <T> T getPreferredBean(Class<T> type,
                                     String preferredName,
                                     org.springframework.context.ApplicationContext context,
                                     String incaseCantFindException)

A utility method to select the Bean from the context right for the job
Use then when there are situations of multi module configurations which may supply the context with multiple or no beans of the given type.

Type Parameters:

T - Type of being searched for

Parameters:

type - as Class

preferredName - as String (name of bean that will be preferred if there are multiple beans)

context - as ApplicationContext

incaseCantFindException - as String

Returns:

@nullable true

unwrapAndSearchExceptions

public static boolean unwrapAndSearchExceptions(Throwable source,
                                                Class<? extends Exception>... exceptions)

Unwrap and trap Exceptions of the desired type. If the desired exception is found then it returns true. The Class match is exact by default. So it ensures to match the Exception type to the specifc type only; parent child relations are not respected.

Parameters:

source - as Throwable

exceptions - as Class ...

getRootCause

public static <E extends Throwable> E getRootCause(E source,
                                                   Integer maxDepth)

Get innermost cause upto maxDepth level. If maxDepth is Null, then it will go till root.

Parameters:

source - as Throwable

maxDepth - as int @Nuallble true for infinite

Returns:

Throwable

getDeclaredFields

public static Field[] getDeclaredFields(Class c)

Get Class.getDeclaredFields() for the class and its parents
Will contain all static and non-static fields of all visibility.

Parameters:

c -

Returns:

Field[]

getDeclaredField

public static Field getDeclaredField(Class c,
                                     String name)

Get a field for the Class or return null

Parameters:

c -

name -

Returns:

Field

isStatic

public static boolean isStatic(Field f)

Check if a Field is static or not

Parameters:

f - as Field

Returns:

boolean

isValidOrPrimitiveFieldType

public static boolean isValidOrPrimitiveFieldType(Class<?> type)

If primitive, String, Date or Calendar type, will return true

Parameters:

type -

Returns:

boolean

filter

public static Field[] filter(Field[] fields,
                             boolean includeStatic,
                             boolean inclSubClasForComparison,
                             Class... typesToInclude)

Filter array Fields and if a specific list of Types is provided then restrict the output to that type/Class of Field only.

Parameters:

fields - as Field[] to be filtered

includeStatic - include static declarations

inclSubClasForComparison - , if true will compare the field not just for an exact match in the typesToInclude but also any of their derived children in the hierarchy TODO: Add Unit Test for this

getClassesInPackage

public static Set<Class> getClassesInPackage(Class parentClass,
                                             String packagePath,
                                             Consumer<? super org.springframework.beans.factory.config.BeanDefinition> consumer)

Parameters:

parentClass - Fetch classes that only inherit from this class within the mentioned package

packagePath - as String. Example: com/neurosys/utils

consumer - as Consumer

Returns:

Set of Class, if no consumer is provided.