Package uk.ac.ebi.utils.opt.io

Class Unix4jUtils

java.lang.Object

uk.ac.ebi.utils.opt.io.Unix4jUtils

public class Unix4jUtils
extends Object

Utilities for the great Unix4j library.

WARNING: In order to avoid too many dependency for jUtils, you have to declare the dependency on both Unix4j and EasyStream (copy-paste them from the junit-io's pom).

Author:

brandizi

Date:

22 Mar 2018

Constructor Summary

Constructors

Constructor	Description
Unix4jUtils()

Method Summary

Modifier and Type	Method	Description
static InputStream	sedFilter(InputStream inStream, String sedScript)	Just a wrapper that uses invalid reference #unixFilter(To, InputStream) to process an input stream via the sed command.
static InputStream	sedFilter(InputStream inStream, String regex, String repl)	Just a wrapper of sedFilter(InputStream, String) that tweaks a stream dynamically, to replace text based on a regular expression.
static InputStream	unixFilter(org.unix4j.builder.To command)	Pipes the output of a Unix4j command

Methods inherited from class java.lang.Object

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

Constructor Details

Unix4jUtils

public Unix4jUtils()

Method Details

unixFilter

public static InputStream unixFilter(org.unix4j.builder.To command)

Pipes the output of a Unix4j command

This sends an InputStream to a Unix4j command and returns another input stream that is the output of that command.

Differently from Command.join(Command), this emulates the pipe '|' operator in Unix in a way such that the command's output can be sent to some Java input consumer, after it has been filtered by the command.

Also note that we're doing this dynamically, the initial input stream is processed while a consumer reads the stream returned by this method. This is achieved through the EasyStream library

sedFilter

public static InputStream sedFilter(InputStream inStream,
 String sedScript)

Just a wrapper that uses

invalid reference

#unixFilter(To, InputStream)

to process an input stream via the sed command.

sedFilter

public static InputStream sedFilter(InputStream inStream,
 String regex,
 String repl)

Just a wrapper of sedFilter(InputStream, String) that tweaks a stream dynamically, to replace text based on a regular expression. The repl parameter accepts backreferences like \1.

Returns:

the filter that does the replacement, as an InputStream in which the filtering operation is invoked dynamically while, the stream is read.