at.chrl.nutils

Class ClassUtils

java.lang.Object

at.chrl.nutils.ClassUtils

public final class ClassUtils
extends Object

This class contains utilities that are used when we are working with classes

Author:

SoulKeeper

Constructor Summary

Constructors

Constructor and Description
ClassUtils()

Method Summary

Modifier and Type	Method and Description
static <T> int	compareTo(T obj1, T obj2, Function<T,? extends Comparable<?>>... getters) Helper function to implement compare interfaces
static <T> boolean	equals(T obj1, Object obj2, Function<T,?>... getters) Helper function to implement equals by given getter functions
static Set<String>	getClassNamesFromDirectory(File directory) Returns class names from directory.
static Set<String>	getClassNamesFromJarFile(File file) Method that returns all class file names from given jar file
static Set<String>	getClassNamesFromPackage(File directory, String packageName, boolean recursive) Recursive method used to find all classes in a given directory and subdirs.
static Class<?>	getNonPrimitiveClass(Class<?> clazz)
static Class<?>	getPrimitiveClass(Class<?> clazz)
static Collection<Class<?>>	getPrimitveClasses()
static <T> String	getString(T obj, Function<T,?>... getters) Helper function for toString function
static <T> int	hashCode(T obj, Function<T,?>... getters) Helper function to calculate a hashcode from selected getter functions null values are treated as 0
static boolean	isPackageMember(Class<?> clazz, String packageName) Checks if class in member of the package
static boolean	isPackageMember(String className, String packageName) Checks if classNames belongs to package
static boolean	isSubclass(Class<?> a, Class<?> b) Return true if class a is either equivalent to class b, or if class a is a subclass of class b, i.e. if a either "extends" or "implements" b.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassUtils

public ClassUtils()

Method Detail

getString

@SafeVarargs
public static final <T> String getString(T obj,
                                                       Function<T,?>... getters)

Helper function for toString function

Parameters:

obj -

getters -

Returns:

string representation with given getters

hashCode

@SafeVarargs
public static final <T> int hashCode(T obj,
                                                   Function<T,?>... getters)

Helper function to calculate a hashcode from selected getter functions

null values are treated as 0

Parameters:

obj -

getters -

Returns:

hash

equals

@SafeVarargs
public static final <T> boolean equals(T obj1,
                                                     Object obj2,
                                                     Function<T,?>... getters)

Helper function to implement equals by given getter functions

Parameters:

obj1 -

obj2 -

getters -

Returns:

equals or not

compareTo

@SafeVarargs
public static final <T> int compareTo(T obj1,
                                                    T obj2,
                                                    Function<T,? extends Comparable<?>>... getters)

Helper function to implement compare interfaces

Parameters:

obj1 -

obj2 -

getters -

Returns:

compared objects

See Also:

Comparable#compareTo(Object)}

isSubclass

public static boolean isSubclass(Class<?> a,
                                 Class<?> b)

Return true if class a is either equivalent to class b, or if class a is a subclass of class b, i.e. if a either "extends" or "implements" b. Note tht either or both "Class" objects may represent interfaces.

Parameters:

a - class

b - class

Returns:

true if a == b or a extends b or a implements b

isPackageMember

public static boolean isPackageMember(Class<?> clazz,
                                      String packageName)

Checks if class in member of the package

Parameters:

clazz - class to check

packageName - package

Returns:

true if is member

isPackageMember

public static boolean isPackageMember(String className,
                                      String packageName)

Checks if classNames belongs to package

Parameters:

className - class name

packageName - package

Returns:

true if belongs

getClassNamesFromDirectory

public static Set<String> getClassNamesFromDirectory(File directory)
                                              throws IllegalArgumentException

Returns class names from directory.

Parameters:

directory - folder with class files

Returns:

Set of fully qualified class names

Throws:

IllegalArgumentException - if specified file is not directory or does not exists

NullPointerException - if directory is null

getClassNamesFromPackage

public static Set<String> getClassNamesFromPackage(File directory,
                                                   String packageName,
                                                   boolean recursive)

Recursive method used to find all classes in a given directory and subdirs.

Parameters:

directory - The base directory

packageName - The package name for classes found inside the base directory

recursive - include subpackages or not

Returns:

The classes

getClassNamesFromJarFile

public static Set<String> getClassNamesFromJarFile(File file)
                                            throws IOException

Method that returns all class file names from given jar file

Parameters:

file - jar file

Returns:

class names from jar file

Throws:

IOException - if something went wrong

IllegalArgumentException - if file doesn't exists or is not jar file

NullPointerException - if file is null

getPrimitiveClass

public static Class<?> getPrimitiveClass(Class<?> clazz)

getPrimitveClasses

public static Collection<Class<?>> getPrimitveClasses()

getNonPrimitiveClass

public static Class<?> getNonPrimitiveClass(Class<?> clazz)