Package com.j3d.engine.interact.cmd

Class RunHistory

java.lang.Object

com.j3d.engine.interact.cmd.RunHistory

public class RunHistory
extends Object

Manages the history of executed commands in the command palette.

It provides functionality to navigate through the command history using up() and down() methods, and to commit new commands to the history using commit(String).

Author:

Lehlogonolo Poole

See Also:

• CommandParser

Field Summary

Fields

Modifier and Type	Field	Description
private final ArrayList<String>	backup
private final ArrayList<String>	history

Constructor Summary

Constructors

Constructor	Description
RunHistory()	Constructs a new RunHistory.

Method Summary

Modifier and Type	Method	Description
void	commit(String line)	Commits a command line to the history.
String	down()	Navigates down through the command history.
private void	removeFirstIfFull(ArrayList<String> arr)	Removes the first element from the given ArrayList if its size reaches the maximum limit.
String	up()	Navigates up through the command history.

Methods inherited from class java.lang.Object

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

Field Details

history

private final ArrayList<String> history

backup

private final ArrayList<String> backup

Constructor Details

RunHistory

public RunHistory()

Constructs a new RunHistory.

Method Details

commit

public void commit(String line)

Commits a command line to the history.

This clears the backup history and adds the new command to the main history.

Parameters:

line - The command line to commit.

up

public String up()

Navigates up through the command history.

Moves the last command from the main history to the backup history and returns it.

Returns:

The previous command in the history, or an empty string if the history is empty.

down

public String down()

Navigates down through the command history.

Moves the last command from the backup history back to the main history and returns it.

Returns:

The next command in the history, or an empty string if the backup history is empty.

removeFirstIfFull

private void removeFirstIfFull(ArrayList<String> arr)

Removes the first element from the given ArrayList if its size reaches the maximum limit.

This method ensures that the history lists do not grow indefinitely.

Parameters:

arr - The ArrayList to check and modify.