Module org.tentackle.common

Package org.tentackle.common

Class FileHelper

java.lang.Object

org.tentackle.common.FileHelper

public class FileHelper
extends Object

Helper methods for file handling.

Author:

harald

Method Summary

Modifier and Type	Method	Description
static void	copy(File source, File dest)	Copies a file.
static int	copyDirectory(File srcDir, File dstDir, boolean recursive, FileFilter filter)	Copies all files from one directory to another.
static InputStream	createInputStream(Class<?> caller, String name)	Creates an input stream from a resource.
static byte[]	download(URL url)	Downloads data from a URL into memory.
static Properties	loadProperties(String name)	Loads properties. Tries to load from filesystem first, then from classpath.
static Properties	loadProperties(String name, boolean asResource)	Loads properties from a resource.
static void	removeDirectory(String name)	Removes a directory and all its contents recursively.
static void	unzip(File zipFile, File destDir, Consumer<File> fileConsumer)	Unzips a zip file.

Methods inherited from class java.lang.Object

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

Method Details

createInputStream

public static InputStream createInputStream(Class<?> caller,
 String name)
                                     throws IOException

Creates an input stream from a resource.

Parameters:

caller - the caller class, null to determine via StackWalker

name - the resource name

Returns:

the input stream

Throws:

IOException - if reading the resources failed

FileNotFoundException - if no such resources found

loadProperties

public static Properties loadProperties(String name,
 boolean asResource)
                                 throws IOException

Loads properties from a resource.

Parameters:

name - the properties name, null if return empty properties

asResource - true if load from the classpath, false if from filesystem

Returns:

the properties, empty if filename is null

Throws:

IOException - if reading the property file failed

FileNotFoundException - if no properties found

loadProperties

public static Properties loadProperties(String name)
                                 throws IOException

Loads properties.
Tries to load from filesystem first, then from classpath.

Parameters:

name - the properties name, null if return empty properties

Returns:

the properties, empty if filename is null

Throws:

IOException - if reading the property file failed

FileNotFoundException - if no properties found

copy

public static void copy(File source,
 File dest)
                 throws IOException

Copies a file.

Parameters:

source - the source file

dest - the destination file

Throws:

IOException - if some I/O error

copyDirectory

public static int copyDirectory(File srcDir,
 File dstDir,
 boolean recursive,
 FileFilter filter)
                         throws IOException

Copies all files from one directory to another.

Parameters:

srcDir - the source directory

dstDir - the destination directory

recursive - true if copy also subdirectories

filter - optional file filter, null if none

Returns:

number of files copied

Throws:

IOException - if copy failed

download

public static byte[] download(URL url)
                       throws IOException

Downloads data from a URL into memory.

Parameters:

url - the URL

Returns:

the data as bytes

Throws:

IOException - if failed

removeDirectory

public static void removeDirectory(String name)
                            throws IOException

Removes a directory and all its contents recursively.

Parameters:

name - the directory name

Throws:

IOException - if failed

unzip

public static void unzip(File zipFile,
 File destDir,
 Consumer<File> fileConsumer)
                  throws IOException

Unzips a zip file.

Parameters:

zipFile - the zip file

destDir - the destination directory

fileConsumer - optional consumer to receive the file being unzipped

Throws:

IOException - if failed