Package cn.sliew.milky.common.util

Class ClassUtil

java.lang.Object

cn.sliew.milky.common.util.ClassUtil

public final class ClassUtil
extends Object

Method Summary

Modifier and Type	Method	Description
static ClassLoader	getClassLoader()	Return the default ClassLoader to use: typically the thread context ClassLoader, if available; the ClassLoader that loaded the ClassUtils class will be used as fallback.
static ClassLoader	getClassLoader(Class<?> clazz)	get class loader
static String	nullSafeToString(Class<?> clazz)	Get the fully qualified name of the supplied class.
static String	nullSafeToString(Class<?>... classes)	Generate a comma-separated list of fully qualified class names for the supplied classes.
static String	nullSafeToString(Function<? super Class<?>,? extends String> mapper, Class<?>... classes)	Generate a comma-separated list of mapped values for the supplied classes.

Methods inherited from class java.lang.Object

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

Method Detail

nullSafeToString

public static String nullSafeToString(Class<?> clazz)

Get the fully qualified name of the supplied class.

This is a null-safe variant of Class.getName().

Parameters:

clazz - the class whose name should be retrieved, potentially null

Returns:

the fully qualified class name or "null" if the supplied class reference is null

See Also:

nullSafeToString(Class...), StringUtils.nullSafeToString(Object)

nullSafeToString

public static String nullSafeToString(Class<?>... classes)

Generate a comma-separated list of fully qualified class names for the supplied classes.

Parameters:

classes - the classes whose names should be included in the generated string

Returns:

a comma-separated list of fully qualified class names, or an empty string if the supplied class array is null or empty

See Also:

nullSafeToString(Function, Class...), StringUtils.nullSafeToString(Object)

nullSafeToString

public static String nullSafeToString(Function<? super Class<?>,? extends String> mapper,
                                      Class<?>... classes)

Generate a comma-separated list of mapped values for the supplied classes.

The values are generated by the supplied mapper (e.g., Class::getName, Class::getSimpleName, etc.), unless a class reference is null in which case it will be mapped to "null".

Parameters:

mapper - the mapper to use; never null

classes - the classes to map

Returns:

a comma-separated list of mapped values, or an empty string if the supplied class array is null or empty

See Also:

nullSafeToString(Class...), StringUtils.nullSafeToString(Object)

getClassLoader

public static ClassLoader getClassLoader()

Return the default ClassLoader to use: typically the thread context ClassLoader, if available; the ClassLoader that loaded the ClassUtils class will be used as fallback.

Call this method if you intend to use the thread context ClassLoader in a scenario where you absolutely need a non-null ClassLoader reference: for example, for class path resource loading (but not necessarily for Class.forName, which accepts a null ClassLoader reference as well).

Returns:

the default ClassLoader (never null)

See Also:

Thread.getContextClassLoader()

getClassLoader

public static ClassLoader getClassLoader(Class<?> clazz)

get class loader

Parameters:

clazz -

Returns:

class loader