com.net2plan.utils

Class ClassLoaderUtils

java.lang.Object

com.net2plan.utils.ClassLoaderUtils

public class ClassLoaderUtils
extends Object

Class to deal with dynamic Java class loading from .class/.jar files.

Since:

0.2.0

Author:

Pablo Pavon-Marino, Jose-Luis Izquierdo-Zaragoza

Method Summary

Modifier and Type	Method and Description
static <T> List<Class<T>>	getClassesFromFile(File file, Class<T> _class, ClassLoader classLoaderToUse) Returns a list of Java classes from a .class/.jar file implementing/extending the specified class.
static Pair<File,String>	getClasspathAndQualifiedNameFromClassFile(File classFile) Tries to guess what are the classpath and fully qualified name of a .class Java file
static FileFilter	getFileFilter() Returns the file filter for this class loader.
static <T> T	getInstance(File file, String className, Class<T> _class, ClassLoader classLoaderToUse) Returns a new instance for the desired class from a given file.
static <T> T	getInstance(File file, String className, Class<T> _class, URLClassLoader classLoaderToUpdate) Returns a new instance for the desired class from a given file.
static Pair<String,String>	getPackageAndClassName(String fullyQualifiedClassName) Given a fully qualified class name returns the package and class names.

Methods inherited from class java.lang.Object

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

Method Detail

getClassesFromFile

public static <T> List<Class<T>> getClassesFromFile(File file,
                                                    Class<T> _class,
                                                    ClassLoader classLoaderToUse)

Returns a list of Java classes from a .class/.jar file implementing/extending the specified class.

Type Parameters:

T - Class type

Parameters:

file - .class/.jar file

_class - Reference to the class

classLoaderToUse - If null, creates a new class loader. If not, loads classes from it

Returns:

List of found Java classes implementing/extending _class

getClasspathAndQualifiedNameFromClassFile

public static Pair<File,String> getClasspathAndQualifiedNameFromClassFile(File classFile)

Tries to guess what are the classpath and fully qualified name of a .class Java file

Parameters:

classFile - .class file

Returns:

An object pair in which the first element is the classpath of the class, and the second one is the fully qualified name

Since:

0.2.0

getFileFilter

public static FileFilter getFileFilter()

Returns the file filter for this class loader.

Returns:

File filter (*.class, *.jar)

getInstance

public static <T> T getInstance(File file,
                                String className,
                                Class<T> _class,
                                ClassLoader classLoaderToUse)

Returns a new instance for the desired class from a given file.

Type Parameters:

T - Class type

Parameters:

file - .class/.jar file

className - the class name

_class - Reference to the class

classLoaderToUse - If null, creates a new class loader. If not, loads classes from it

Returns:

An instance of the given class from

getInstance

public static <T> T getInstance(File file,
                                String className,
                                Class<T> _class,
                                URLClassLoader classLoaderToUpdate)

Returns a new instance for the desired class from a given file.

Type Parameters:

T - Class type

Parameters:

file - .class/.jar file

className - the class name

_class - Reference to the class

classLoaderToUpdate - Class loader to be updated

Returns:

An instance of the given class from

getPackageAndClassName

public static Pair<String,String> getPackageAndClassName(String fullyQualifiedClassName)

Given a fully qualified class name returns the package and class names.

Parameters:

fullyQualifiedClassName - Fully qualified class name

Returns:

String array in which the first element is the package name (empty String means no package), and the second one is the class name