Package migratedb.v1.core.internal.util

Class ClassUtils

java.lang.Object

migratedb.v1.core.internal.util.ClassUtils

public final class ClassUtils
extends Object

Constructor Summary

Constructors

Constructor	Description
ClassUtils()

Method Summary

Modifier and Type	Method	Description
static ClassLoader	defaultClassLoader()
static Path	guessLocationOnDisk(Class<?> aClass)	Tries to get the physical location on disk of aClass.
static <T> T	instantiate(String className, @Nullable ClassLoader classLoader)	Creates a new instance of a class.
static <T> List<T>	instantiateAll(Collection<String> classes, ClassLoader classLoader)	Instantiate all these classes.
static boolean	isImplementationPresent(String serviceName, ClassLoader classLoader)	Determine whether a class implementing the service identified by the supplied name is present and can be loaded.
static boolean	isPresent(String className, ClassLoader classLoader)	Determine whether the Class identified by the supplied name is present and can be loaded.
static Class<?>	loadClass(String className, ClassLoader classLoader)	Loads className using the class loader.

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

instantiate

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

Creates a new instance of a class.

Type Parameters:

T - The type of the new instance.

Parameters:

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

classLoader - The ClassLoader to use.

Returns:

The new instance.

Throws:

MigrateDbException - Thrown when the instantiation failed.

instantiateAll

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

Instantiate all these classes.

Type Parameters:

T - The common type for all classes.

Parameters:

classes - Fully qualified class names to instantiate.

classLoader - The ClassLoader to use.

Returns:

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.

Parameters:

className - The name of the class to check.

classLoader - The ClassLoader to use.

Returns:

whether the specified class is present

isImplementationPresent

public static boolean isImplementationPresent(String serviceName,
                                              ClassLoader classLoader)

Determine whether a class implementing the service identified by the supplied name is present and can be loaded. Will return false if either no class is found, or the class or one of its dependencies is not present or cannot be loaded.

Parameters:

serviceName - The name of the service to check.

classLoader - The ClassLoader to use.

Returns:

whether an implementation of the specified service is present

loadClass

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

Loads className using the class loader.

Parameters:

className - The name of the class to load.

classLoader - The ClassLoader to use.

Returns:

the newly loaded class

guessLocationOnDisk

public static Path guessLocationOnDisk(Class<?> aClass)

Tries to get the physical location on disk of aClass.

Parameters:

aClass - The class to get the location for.

Returns:

The absolute path of the .class file (or null).

defaultClassLoader

public static ClassLoader defaultClassLoader()

Returns:

The first class loader that is non-null:

1. Thread context class loader
2. Class loader of this class
3. System class loader