cs2110

Class Filter

java.lang.Object

cs2110.Filter

public class Filter
extends java.lang.Object

Runs an external script that takes a string on stdin and writes a string to stdout. Example of use: Suppose xxxyyy.pl is a perl script in the user's working directory that contains

 #!perl
 $_ = <STDIN>;
 chomp();
 printf "xxx %s yyy\n", $_;
 __END__
 

Then the Java call

 Filter f = new Filter("perl xxxyyy.pl");
 System.out.println(f.filter("hello world"));
 

will output

 xxx hello world yyy
 

Constructor Summary

Constructors

Constructor and Description
Filter(java.lang.String cmd) Construct a filter for a given external script.

Method Summary

Modifier and Type	Method and Description
java.lang.String	filter(java.lang.String input) Runs an external script on an input string and returns the output string produced by the script.

Methods inherited from class java.lang.Object

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

Constructor Detail

Filter

public Filter(java.lang.String cmd)

Construct a filter for a given external script.

Parameters:

cmd - the command used to invoke the script.

Method Detail

filter

public java.lang.String filter(java.lang.String input)
                        throws java.io.IOException,
                               java.lang.InterruptedException

Runs an external script on an input string and returns the output string produced by the script.

Parameters:

input - the input string to be processed by the script

Returns:

the output string produced by the script

Throws:

java.io.IOException - if an I/O error occurs

java.lang.InterruptedException - if the process is interrupted by another thread