org.jminor.common

Class FileUtil

java.lang.Object

org.jminor.common.FileUtil

public final class FileUtil
extends java.lang.Object

A utility class for working with files

Method Summary

Modifier and Type	Method and Description
static int	countLines(java.io.File file)
static int	countLines(java.io.File file, java.lang.String excludePrefix)
static int	countLines(java.lang.String filename)
static <T> java.util.List<T>	deserializeFromFile(java.io.File file) Deserializes a list of Objects from the given file
static void	serializeToFile(java.util.Collection objects, java.io.File file) Serializes a Collection of Objects to a given file
static void	writeDelimitedFile(java.lang.String[][] headers, java.lang.String[][] data, java.lang.String delimiter, java.io.File file)
static void	writeFile(java.lang.String contents, java.io.File file)
static void	writeFile(java.lang.String contents, java.io.File file, boolean append)

Methods inherited from class java.lang.Object

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

Method Detail

countLines

public static int countLines(java.lang.String filename)
                      throws java.io.IOException

Parameters:

filename - the name of the file

Returns:

the number of lines in the given file

Throws:

java.io.IOException - in case the file can not be read

countLines

public static int countLines(java.io.File file)
                      throws java.io.IOException

Parameters:

file - the file

Returns:

the number of lines in the given file

Throws:

java.io.IOException - in case the file can not be read

countLines

public static int countLines(java.io.File file,
                             java.lang.String excludePrefix)
                      throws java.io.IOException

Parameters:

file - the file

excludePrefix - lines are excluded from the count if they start with this string

Returns:

the number of lines in the given file

Throws:

java.io.IOException - in case the file can not be read

writeDelimitedFile

public static void writeDelimitedFile(java.lang.String[][] headers,
                                      java.lang.String[][] data,
                                      java.lang.String delimiter,
                                      java.io.File file)
                               throws java.io.IOException

Parameters:

headers - any headers to write first

data - the data

delimiter - the delimiter

file - the file to write to

Throws:

java.io.IOException - in case of an exception

writeFile

public static void writeFile(java.lang.String contents,
                             java.io.File file)
                      throws java.io.IOException

Parameters:

contents - the contents to write to the file, overwriting the contents

file - the file

Throws:

java.io.IOException - in case of an exception

writeFile

public static void writeFile(java.lang.String contents,
                             java.io.File file,
                             boolean append)
                      throws java.io.IOException

Parameters:

contents - the contents to write to the file

file - the file

append - if true the contents are appended, otherwise overwritten

Throws:

java.io.IOException - in case of an exception

deserializeFromFile

public static <T> java.util.List<T> deserializeFromFile(java.io.File file)
                                                 throws java.io.IOException,
                                                        java.lang.ClassNotFoundException

Deserializes a list of Objects from the given file

Type Parameters:

T - the type of objects to read from the file

Parameters:

file - the file

Returns:

deserialized objects

Throws:

java.io.IOException - in case the file can not be read

java.lang.ClassNotFoundException - in case the deserialized class is not found

serializeToFile

public static void serializeToFile(java.util.Collection objects,
                                   java.io.File file)
                            throws java.io.IOException

Serializes a Collection of Objects to a given file

Parameters:

objects - the objects to serialize

file - the file

Throws:

java.io.IOException - in case the file can not be written