wyvern.kernel.commands.filters
Class HeadFilter

java.lang.Object
  wyvern.kernel.commands.filters.HeadFilter

All Implemented Interfaces:

CommandFilter

public class HeadFilter

extends java.lang.Object

implements CommandFilter

Implements the "head" command: pass a numeric arg, such as "-20", to see that many lines of the output.

Version:

1.0, Jun 16, 2003

Author:

Steve Yegge

Constructor Summary

HeadFilter()

Method Summary

java.util.ArrayList	filter(java.util.ArrayList lines) Filters the lines.
void	parseArguments(java.lang.String verb, java.lang.String args) Parses the arguments to "head".
java.lang.String	toString() Returns String representation of this filter.

Methods inherited from class java.lang.Object

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

Constructor Detail

HeadFilter

public HeadFilter()

Method Detail

parseArguments

public void parseArguments(java.lang.String verb,
                           java.lang.String args)

Parses the arguments to "head".

Specified by:

parseArguments in interface CommandFilter

Parameters:

verb - the command verb (e.g. "head").

args - the argument string passed to the command, not including the command verb. Null if no arguments were passed to the filter.

filter

public java.util.ArrayList filter(java.util.ArrayList lines)

Filters the lines.

Specified by:

filter in interface CommandFilter

Parameters:

lines - the event output, broken into lines.

Returns:

a subset of the lines, matched against the argument string.

toString

public java.lang.String toString()

Returns String representation of this filter.