Class Wc

java.lang.Object
  |
  +--Command
        |
        +--Wc

public class Wc

extends Command

The Wc class (a subclass of the abstract base class Command) implements the familiar unix command wc, which outputs a count of lines, words, and characters in each file. This class implements the abstract methods execute and getDescription inherited from the abstract base class Command.

Field Summary

protected int	myCharCount Number of characters in file.
protected int	myLineCount Number of lines in file.
protected int	myWordCount Number of words in file.

Constructor Summary

Wc()

Method Summary

protected void	doCount(java.lang.String filename) A helper function that counts the number of lines, words, and characters in the current file.
java.lang.String	execute(java.lang.String args) Executes the wc command and returns the result in the form of a String object.
java.lang.String	getDescription() Returns a description of the command.
protected int	getLineCount() A helper function that returns the line count of the current file.
protected java.lang.String	Update(java.lang.String filename) A helper function that updates the result to be passed back through execute with the counts of the number of lines, words, and characters in the current file.

Methods inherited from class Command

ExpandArgs

Methods inherited from class java.lang.Object

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

Field Detail

myLineCount

protected int myLineCount

Number of lines in file.

myWordCount

protected int myWordCount

Number of words in file.

myCharCount

protected int myCharCount

Number of characters in file.

Constructor Detail

Wc

public Wc()

Method Detail

execute

public java.lang.String execute(java.lang.String args)

Executes the wc command and returns the result in the form of a String object.

Specified by:

execute in class Command

Parameters:

args - arguments for this command.

Returns:

the string result of executing the wc command.

doCount

protected void doCount(java.lang.String filename)

A helper function that counts the number of lines, words, and characters in the current file.

Parameters:

filename - name of file to be counted.

Update

protected java.lang.String Update(java.lang.String filename)

A helper function that updates the result to be passed back through execute with the counts of the number of lines, words, and characters in the current file.

Parameters:

filename - name of file just counted.

Returns:

string containing counts associated with current file.

getLineCount

protected int getLineCount()

A helper function that returns the line count of the current file.

Returns:

myLineCount.

getDescription

public java.lang.String getDescription()

Description copied from class: Command

Returns a description of the command.

Specified by:

getDescription in class Command

Returns:

the name of the command.