com.jezhumble.javasysmon
Class FileUtils

java.lang.Object
  com.jezhumble.javasysmon.FileUtils

public class FileUtils
extends java.lang.Object

Convenience methods for interacting with the filesystem.

Constructor Summary

FileUtils()

Method Summary

java.lang.String[]	pidsFromProcFilesystem() If you're using an operating system that supports the proc filesystem, this returns a list of all processes by reading the directories under /proc
java.lang.String	runRegexOnFile(java.util.regex.Pattern pattern, java.lang.String filename) Runs a regular expression on a file, and returns the first match.
java.lang.String	slurp(java.lang.String fileName) Given a filename, reads the entire file into a string.
java.lang.String	slurpFromInputStream(java.io.InputStream stream) Given an InputStream, reads the entire file into a string.
byte[]	slurpToByteArray(java.lang.String fileName) Given a filename, reads the entire file into a byte array.

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

pidsFromProcFilesystem

public java.lang.String[] pidsFromProcFilesystem()

If you're using an operating system that supports the proc filesystem, this returns a list of all processes by reading the directories under /proc

Returns:

An array of the ids of all processes running on the OS.

slurp

public java.lang.String slurp(java.lang.String fileName)
                       throws java.io.IOException

Given a filename, reads the entire file into a string.

Parameters:

fileName - The path of the filename to read. Should be absolute.

Returns:

A string containing the entire contents of the file

Throws:

java.io.IOException - If there's an IO exception while trying to read the file

slurpToByteArray

public byte[] slurpToByteArray(java.lang.String fileName)
                        throws java.io.IOException

Given a filename, reads the entire file into a byte array.

Parameters:

fileName - The path of the filename to read. Should be absolute.

Returns:

A byte array containing the entire contents of the file

Throws:

java.io.IOException - If there's an IO exception while trying to read the file

slurpFromInputStream

public java.lang.String slurpFromInputStream(java.io.InputStream stream)
                                      throws java.io.IOException

Given an InputStream, reads the entire file into a string.

Parameters:

stream - The InputStream representing the file to read

Returns:

A string containing the entire contents of the input stream

Throws:

java.io.IOException - If there's an IO exception while trying to read the input stream

runRegexOnFile

public java.lang.String runRegexOnFile(java.util.regex.Pattern pattern,
                                       java.lang.String filename)

Runs a regular expression on a file, and returns the first match.

Parameters:

pattern - The regular expression to use.

filename - The path of the filename to match against. Should be absolute.

Returns:

The first match found. Null if no matches.