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package bjc.utils.cli;
/**
* A mode for determining the commands that are valid to enter, and then
* handling those commands.
*
* @author ben
*/
public interface CommandMode extends Comparable<CommandMode> {
/**
* Check to see if this mode can handle the specified command.
*
* @param command
* The command to check.
*
* @return Whether or not this mode can handle the command. It is assumed not by
* default.
*/
default boolean canHandle(final String command) {
return false;
}
/**
* Get the custom prompt for this mode.
*
* @return The custom prompt for this mode.
*
* @throws UnsupportedOperationException
* If this mode doesn't support a custom
* prompt.
*/
default String getCustomPrompt() {
throw new UnsupportedOperationException(
"This mode doesn't support a custom prompt");
}
/**
* Get the name of this command mode.
*
* @return The name of this command mode, or a default string if one isn't
* specified.
*/
public default String getName() {
return "(anonymous)";
}
/**
* Check if this mode uses a custom prompt.
*
* @return Whether or not this mode uses a custom prompt.
*/
default boolean isCustomPromptEnabled() {
return false;
}
/**
* Process a command in this mode..
*
* @param command
* The command to process.
*
* @param args
* A list of arguments to the command.
*
* @return The command mode to use for the next command. Defaults to doing
* nothing, and staying in the current mode.
*/
default CommandMode process(final String command, final String[] args) {
return this;
}
@Override
default int compareTo(final CommandMode o) {
return getName().compareTo(o.getName());
}
}
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