cn.com.pism.frc.resourcescanner.utils

类 ClassUtils

java.lang.Object

cn.com.pism.frc.resourcescanner.utils.ClassUtils

public class ClassUtils
extends Object

Utility methods for dealing with classes.

方法概要

限定符和类型	方法和说明
static ClassLoader	addJarsOrDirectoriesToClasspath(ClassLoader classLoader, List<File> jarFiles) Adds these jars or directories to the classpath.
static String	getLocationOnDisk(Class<?> aClass) Retrieves the physical location on disk of this class.
static String	getStaticFieldValue(String className, String fieldName, ClassLoader classLoader) Gets the String value of a static field.
static <T> T	instantiate(Class<T> clazz) Creates a new instance of this class.
static <T> T	instantiate(String className, ClassLoader classLoader) Creates a new instance of this class.
static <T> List<T>	instantiateAll(String[] classes, ClassLoader classLoader) Instantiate all these classes.
static boolean	isPresent(String className, ClassLoader classLoader) Determine whether the Class identified by the supplied name is present and can be loaded.
static <I> Class<? extends I>	loadClass(Class<I> implementedInterface, String className, ClassLoader classLoader) Loads the class with this name using the class loader.

从类继承的方法 java.lang.Object

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

方法详细资料

instantiate

public static <T> T instantiate(String className,
                                ClassLoader classLoader)

Creates a new instance of this class.

类型参数:

T - The type of the new instance.

参数:

className - The fully qualified name of the class to instantiate.

classLoader - The ClassLoader to use.

返回:

The new instance.

抛出:

ScannerException - Thrown when the instantiation failed.

instantiate

public static <T> T instantiate(Class<T> clazz)

Creates a new instance of this class.

类型参数:

T - The type of the new instance.

参数:

clazz - The class to instantiate.

返回:

The new instance.

抛出:

ScannerException - Thrown when the instantiation failed.

instantiateAll

public static <T> List<T> instantiateAll(String[] classes,
                                         ClassLoader classLoader)

Instantiate all these classes.

类型参数:

T - The common type for all classes.

参数:

classes - A fully qualified class names to instantiate.

classLoader - The ClassLoader to use.

返回:

The list of instances.

isPresent

public static boolean isPresent(String className,
                                ClassLoader classLoader)

Determine whether the Class identified by the supplied name is present and can be loaded. Will return false if either the class or one of its dependencies is not present or cannot be loaded.

参数:

className - The name of the class to check.

classLoader - The ClassLoader to use.

返回:

whether the specified class is present

loadClass

public static <I> Class<? extends I> loadClass(Class<I> implementedInterface,
                                               String className,
                                               ClassLoader classLoader)

Loads the class with this name using the class loader.

参数:

implementedInterface - The interface the class is expected to implement.

className - The name of the class to load.

classLoader - The ClassLoader to use.

返回:

the newly loaded class or null if it could not be loaded.

getLocationOnDisk

public static String getLocationOnDisk(Class<?> aClass)

Retrieves the physical location on disk of this class.

参数:

aClass - The class to get the location for.

返回:

The absolute path of the .class file.

addJarsOrDirectoriesToClasspath

public static ClassLoader addJarsOrDirectoriesToClasspath(ClassLoader classLoader,
                                                          List<File> jarFiles)

Adds these jars or directories to the classpath.

参数:

classLoader - The current ClassLoader.

jarFiles - The jars or directories to add.

返回:

The new ClassLoader containing the additional jar or directory.

getStaticFieldValue

public static String getStaticFieldValue(String className,
                                         String fieldName,
                                         ClassLoader classLoader)

Gets the String value of a static field.

参数:

className - The fully qualified name of the class to instantiate.

classLoader - The ClassLoader to use.

fieldName - The field name

返回:

The value of the field.

抛出:

ScannerException - Thrown when the instantiation failed.