package org.bukkit.command;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.apache.commons.lang.Validate;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Server;
import org.bukkit.entity.Player;
import org.bukkit.entity.minecart.CommandMinecart;
import org.bukkit.permissions.Permissible;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.util.StringUtil;
import com.google.common.collect.ImmutableList;
/**
* Represents a Command, which executes various tasks upon user input
*/
public abstract class Command {
private final String name;
private String nextLabel;
private String label;
private List<String> aliases;
private List<String> activeAliases;
private CommandMap commandMap = null;
protected String description = "";
protected String usageMessage;
private String permission;
private String permissionMessage;
protected Command(String name) {
this(name, "", "/" + name, new ArrayList<String>());
}
protected Command(String name, String description, String usageMessage, List<String> aliases) {
this.name = name;
this.nextLabel = name;
this.label = name;
this.description = description;
this.usageMessage = usageMessage;
this.aliases = aliases;
this.activeAliases = new ArrayList<String>(aliases);
}
/**
* Executes the command, returning its success
*
* @param sender Source object which is executing this command
* @param commandLabel The alias of the command used
* @param args All arguments passed to the command, split via ' '
* @return true if the command was successful, otherwise false
*/
public abstract boolean execute(CommandSender sender, String commandLabel, String[] args);
/**
* @deprecated This method is not supported and returns null
*/
@Deprecated
public List<String> tabComplete(CommandSender sender, String[] args) {
return null;
}
/**
* Executed on tab completion for this command, returning a list of
* options the player can tab through.
*
* @param sender Source object which is executing this command
* @param alias the alias being used
* @param args All arguments passed to the command, split via ' '
* @return a list of tab-completions for the specified arguments. This
* will never be null. List may be immutable.
* @throws IllegalArgumentException if sender, alias, or args is null
*/
public List<String> tabComplete(CommandSender sender, String alias, String[] args) throws IllegalArgumentException {
Validate.notNull(sender, "Sender cannot be null");
Validate.notNull(args, "Arguments cannot be null");
Validate.notNull(alias, "Alias cannot be null");
if (args.length == 0) {
return ImmutableList.of();
}
String lastWord = args[args.length - 1];
Player senderPlayer = sender instanceof Player ? (Player) sender : null;
ArrayList<String> matchedPlayers = new ArrayList<String>();
for (Player player : sender.getServer().getOnlinePlayers()) {
String name = player.getName();
if ((senderPlayer == null || senderPlayer.canSee(player)) && StringUtil.startsWithIgnoreCase(name, lastWord)) {
matchedPlayers.add(name);
}
}
Collections.sort(matchedPlayers, String.CASE_INSENSITIVE_ORDER);
return matchedPlayers;
}
/**
* Returns the name of this command
*
* @return Name of this command
*/
public String getName() {
return name;
}
/**
* Gets the permission required by users to be able to perform this
* command
*
* @return Permission name, or null if none
*/
public String getPermission() {
return permission;
}
/**
* Sets the permission required by users to be able to perform this
* command
*
* @param permission Permission name or null
*/
public void setPermission(String permission) {
this.permission = permission;
}
/**
* Tests the given {@link CommandSender} to see if they can perform this
* command.
* <p>
* If they do not have permission, they will be informed that they cannot
* do this.
*
* @param target User to test
* @return true if they can use it, otherwise false
*/
public boolean testPermission(CommandSender target) {
if (testPermissionSilent(target)) {
return true;
}
if (permissionMessage == null) {
target.sendMessage(ChatColor.RED + "I'm sorry, but you do not have permission to perform this command. Please contact the server administrators if you believe that this is in error.");
} else if (permissionMessage.length() != 0) {
for (String line : permissionMessage.replace("<permission>", permission).split("\n")) {
target.sendMessage(line);
}
}
return false;
}
/**
* Tests the given {@link CommandSender} to see if they can perform this
* command.
* <p>
* No error is sent to the sender.
*
* @param target User to test
* @return true if they can use it, otherwise false
*/
public boolean testPermissionSilent(CommandSender target) {
if ((permission == null) || (permission.length() == 0)) {
return true;
}
for (String p : permission.split(";")) {
if (target.hasPermission(p)) {
return true;
}
}
return false;
}
/**
* Returns the current label for this command
*
* @return Label of this command or null if not registered
*/
public String getLabel() {
return label;
}
/**
* Sets the label of this command.
* <p>
* If the command is currently registered the label change will only take
* effect after its been re-registered e.g. after a /reload
*
* @param name The command's name
* @return returns true if the name change happened instantly or false if
* it was scheduled for re-registration
*/
public boolean setLabel(String name) {
this.nextLabel = name;
if (!isRegistered()) {
this.label = name;
return true;
}
return false;
}
/**
* Registers this command to a CommandMap.
* Once called it only allows changes the registered CommandMap
*
* @param commandMap the CommandMap to register this command to
* @return true if the registration was successful (the current registered
* CommandMap was the passed CommandMap or null) false otherwise
*/
public boolean register(CommandMap commandMap) {
if (allowChangesFrom(commandMap)) {
this.commandMap = commandMap;
return true;
}
return false;
}
/**
* Unregisters this command from the passed CommandMap applying any
* outstanding changes
*
* @param commandMap the CommandMap to unregister
* @return true if the unregistration was successfull (the current
* registered CommandMap was the passed CommandMap or null) false
* otherwise
*/
public boolean unregister(CommandMap commandMap) {
if (allowChangesFrom(commandMap)) {
this.commandMap = null;
this.activeAliases = new ArrayList<String>(this.aliases);
this.label = this.nextLabel;
return true;
}
return false;
}
private boolean allowChangesFrom(CommandMap commandMap) {
return (null == this.commandMap || this.commandMap == commandMap);
}
/**
* Returns the current registered state of this command
*
* @return true if this command is currently registered false otherwise
*/
public boolean isRegistered() {
return (null != this.commandMap);
}
/**
* Returns a list of active aliases of this command
*
* @return List of aliases
*/
public List<String> getAliases() {
return activeAliases;
}
/**
* Returns a message to be displayed on a failed permission check for this
* command
*
* @return Permission check failed message
*/
public String getPermissionMessage() {
return permissionMessage;
}
/**
* Gets a brief description of this command
*
* @return Description of this command
*/
public String getDescription() {
return description;
}
/**
* Gets an example usage of this command
*
* @return One or more example usages
*/
public String getUsage() {
return usageMessage;
}
/**
* Sets the list of aliases to request on registration for this command.
* This is not effective outside of defining aliases in the {@link
* PluginDescriptionFile#getCommands()} (under the
* `<code>aliases</code>' node) is equivalent to this method.
*
* @param aliases aliases to register to this command
* @return this command object, for chaining
*/
public Command setAliases(List<String> aliases) {
this.aliases = aliases;
if (!isRegistered()) {
this.activeAliases = new ArrayList<String>(aliases);
}
return this;
}
/**
* Sets a brief description of this command. Defining a description in the
* {@link PluginDescriptionFile#getCommands()} (under the
* `<code>description</code>' node) is equivalent to this method.
*
* @param description new command description
* @return this command object, for chaining
*/
public Command setDescription(String description) {
this.description = description;
return this;
}
/**
* Sets the message sent when a permission check fails
*
* @param permissionMessage new permission message, null to indicate
* default message, or an empty string to indicate no message
* @return this command object, for chaining
*/
public Command setPermissionMessage(String permissionMessage) {
this.permissionMessage = permissionMessage;
return this;
}
/**
* Sets the example usage of this command
*
* @param usage new example usage
* @return this command object, for chaining
*/
public Command setUsage(String usage) {
this.usageMessage = usage;
return this;
}
public static void broadcastCommandMessage(CommandSender source, String message) {
broadcastCommandMessage(source, message, true);
}
public static void broadcastCommandMessage(CommandSender source, String message, boolean sendToSource) {
String result = source.getName() + ": " + message;
if (source instanceof BlockCommandSender) {
BlockCommandSender blockCommandSender = (BlockCommandSender) source;
if (blockCommandSender.getBlock().getWorld().getGameRuleValue("commandBlockOutput").equalsIgnoreCase("false")) {
Bukkit.getConsoleSender().sendMessage(result);
return;
}
} else if (source instanceof CommandMinecart) {
CommandMinecart commandMinecart = (CommandMinecart) source;
if (commandMinecart.getWorld().getGameRuleValue("commandBlockOutput").equalsIgnoreCase("false")) {
Bukkit.getConsoleSender().sendMessage(result);
return;
}
}
Set<Permissible> users = Bukkit.getPluginManager().getPermissionSubscriptions(Server.BROADCAST_CHANNEL_ADMINISTRATIVE);
String colored = ChatColor.GRAY + "" + ChatColor.ITALIC + "[" + result + ChatColor.GRAY + ChatColor.ITALIC + "]";
if (sendToSource && !(source instanceof ConsoleCommandSender)) {
source.sendMessage(message);
}
for (Permissible user : users) {
if (user instanceof CommandSender) {
CommandSender target = (CommandSender) user;
if (target instanceof ConsoleCommandSender) {
target.sendMessage(result);
} else if (target != source) {
target.sendMessage(colored);
}
}
}
}
@Override
public String toString() {
return getClass().getName() + '(' + name + ')';
}
}