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package bjc.utils.cli.fds;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import bjc.utils.cli.CommandHelp;
import static java.lang.String.format;
/**
* Simple implementation of {@link FDSMode}.
*
* @author bjculkin
*
* @param <S>
* The FDS state type.
*/
public class SimpleFDSMode<S> implements FDSMode<S> {
private Map<Character, FDSCommand<S>> commands;
private Map<Character, FDSMode<S>> modes;
private Multimap<Character, CommandHelp> help;
private Set<Character> registered;
private char[] registeredArray;
private boolean changed;
/**
* Create a new empty FDS mode.
*/
public SimpleFDSMode() {
commands = new HashMap<>();
modes = new HashMap<>();
help = HashMultimap.create();
registered = new HashSet<>();
changed = true;
}
/**
* Add a command to the mode.
*
* @param c
* The character to bind to the command.
*
* @param comm
* The command to add.
*
* @param hlp
* The help for the command.
*
* @throws IllegalArgumentException
* If the character is already bound to a command.
*/
public void addCommand(char c, FDSCommand<S> comm, CommandHelp hlp) {
if (comm == null)
throw new NullPointerException("Command must not be null");
else if (commands.containsKey(c))
throw new IllegalArgumentException(format("Character '%s' is already bound"));
commands.put(c, comm);
help.put(c, hlp);
registered.add(c);
if (!changed) changed = true;
}
/**
* Add a submode to the mode.
*
* @param c
* The character to bind to the submode.
*
* @param mode
* The submode to add.
*
* @throws IllegalArgumentException
* If the character is already bound to a submode.
*/
public void addSubmode(char c, FDSMode<S> mode, CommandHelp hlp) {
if (mode == null)
throw new NullPointerException("Mode must not be null");
else if (modes.containsKey(c))
throw new IllegalArgumentException(format("Character '%s' is already bound"));
modes.put(c, mode);
help.put(c, hlp);
registered.add(c);
if (!changed) changed = true;
}
@Override
public char[] registeredChars() {
if (!changed) return registeredArray;
registeredArray = new char[registered.size()];
int i = 0;
for (char c : registered) {
registeredArray[i] = c;
i += 1;
}
changed = false;
return registeredArray;
}
@Override
public boolean hasCommand(char c) {
return commands.containsKey(c);
}
@Override
public boolean hasSubmode(char c) {
return modes.containsKey(c);
}
@Override
public FDSCommand<S> getCommand(char c) throws FDSException {
if (!commands.containsKey(c)) {
throw new FDSException(String.format("No command bound to '%s'", c));
}
return commands.get(c);
}
@Override
public FDSMode<S> getSubmode(char c) throws FDSException {
if (!modes.containsKey(c)) {
throw new FDSException(String.format("No mode bound to '%s'", c));
}
return modes.get(c);
}
@Override
public Collection<CommandHelp> getHelp(char c) {
return help.get(c);
}
}
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