imagingbook.lib.util

Class FileUtils

java.lang.Object

imagingbook.lib.util.FileUtils

public abstract class FileUtils
extends Object

This class defines various static methods for managing file-based resources and JAR manifest files.

Constructor Summary

Constructors

Constructor and Description
FileUtils()

Method Summary

Modifier and Type	Method and Description
static boolean	checkClass(String classname) Checks 'by name' if a particular class exists.
static void	copyToFile(InputStream in, File file) Reads all data from the given input stream and copies them to to a file.
static String	getClassPath(Class<?> clazz) Find the path from which a given class was loaded.
static String	getFileExtension(String name) Extracts the extension part of a pathname as a string.
static Manifest	getJarManifest(Class<?> clazz) Finds the manifest (from META-INF/MANIFEST.MF) of the JAR file from which clazz was loaded.
static void	main(String[] args)
static void	printClassPath() Lists (to System.out) the paths where classes are loaded from.
static String	stripFileExtension(String name) Removes the extension part of a pathname.

Methods inherited from class java.lang.Object

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

Constructor Detail

FileUtils

public FileUtils()

Method Detail

stripFileExtension

public static String stripFileExtension(String name)

Removes the extension part of a pathname. Examples:
"foo.txt" → "foo", "foo" → "foo", "foo." → "foo.", ".txt" → ".txt".

Parameters:

name - the pathname

Returns:

the pathname without the extension (if valid)

getFileExtension

public static String getFileExtension(String name)

Extracts the extension part of a pathname as a string. Examples:
"foo.txt" → "txt", "foo" → "", "foo." → "", ".txt" → "".

Parameters:

name - the pathname

Returns:

the extension or an empty string

getClassPath

public static String getClassPath(Class<?> clazz)

Find the path from which a given class was loaded.

Parameters:

clazz - a class.

Returns:

the path of the .class file for the given class or null (e.g. if the class is anonymous).

printClassPath

public static void printClassPath()

Lists (to System.out) the paths where classes are loaded from.

checkClass

public static boolean checkClass(String classname)

Checks 'by name' if a particular class exists.

Parameters:

classname - fully qualified name of the class, e.g. imagingbook.lib.util.FileUtils

Returns:

true if the class was found, false otherwise

copyToFile

public static void copyToFile(InputStream in,
                              File file)
                       throws IOException

Reads all data from the given input stream and copies them to to a file.

Parameters:

in - the input stream

file - the output file

Throws:

IOException - if anything goes wrong

getJarManifest

public static Manifest getJarManifest(Class<?> clazz)

Finds the manifest (from META-INF/MANIFEST.MF) of the JAR file from which clazz was loaded. See: http://stackoverflow.com/a/1273432

Parameters:

clazz - A class in the JAR file of interest.

Returns:

A Manifest object or null if clazz was not loaded from a JAR file.

main

public static void main(String[] args)