add code

src/main/java/sh/okx/rankup/messages/EmptyMessageBuilder.java

@@ -0,0 +1,32 @@
+package sh.okx.rankup.messages;
+
+import org.bukkit.command.CommandSender;
+
+class EmptyMessageBuilder extends MessageBuilder {
+  EmptyMessageBuilder() {
+    super(null);
+  }
+
+  @Override
+  public MessageBuilder failIfEmpty() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public MessageBuilder replace(Variable variable, Object value) {
+    return this;
+  }
+
+  @Override
+  public void send(CommandSender sender) {
+  }
+
+  @Override
+  public void broadcast() {
+  }
+
+  @Override
+  public String toString() {
+    return null;
+  }
+}

src/main/java/sh/okx/rankup/messages/Message.java

@@ -0,0 +1,25 @@
+package sh.okx.rankup.messages;
+
+import lombok.Getter;
+
+public enum Message {
+  NOT_IN_LADDER("not-in-ladder"),
+  REQUIREMENTS_NOT_MET("rankup.requirements-not-met"),
+  NO_RANKUP("rankup.no-rankup"),
+  SUCCESS_PUBLIC("rankup.success-public"),
+  SUCCESS_PRIVATE("rankup.success-private"),
+  CONFIRMATION("rankup.confirmation"),
+  TITLE("rankup.title"),
+  RANKS_HEADER("ranks.header"),
+  RANKS_FOOTER("ranks.footer"),
+  RANKS_COMPLETE("rankup.ranks.complete"),
+  RANKS_CURRENT("rankup.ranks.current"),
+  RANKS_INCOMPLETE("rankup.ranks.incomplete");
+
+  @Getter
+  private final String name;
+
+  Message(String name) {
+    this.name = name;
+  }
+}

src/main/java/sh/okx/rankup/messages/MessageBuilder.java

@@ -0,0 +1,103 @@
+package sh.okx.rankup.messages;
+
+import lombok.AllArgsConstructor;
+import net.milkbowl.vault.economy.Economy;
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.entity.Player;
+import sh.okx.rankup.ranks.Rank;
+import sh.okx.rankup.ranks.requirements.Requirement;
+
+import java.text.DecimalFormat;
+
+public class MessageBuilder {
+  private String message;
+
+  public MessageBuilder(String message) {
+    this.message = message;
+  }
+
+  public static MessageBuilder of(ConfigurationSection config, Message message) {
+    return new MessageBuilder(ChatColor.translateAlternateColorCodes('&', config.getString(message.getName())));
+  }
+
+  public MessageBuilder replace(Variable variable, Object value) {
+    this.message = variable.replace(message, String.valueOf(value));
+    return this;
+  }
+
+  public MessageBuilder replaceAll(CommandSender player, Rank rank) {
+    replace(Variable.PLAYER, player.getName());
+    replaceAll(rank);
+    return this;
+  }
+
+  public MessageBuilder replaceAll(CommandSender player, Rank oldRank, Rank rank) {
+    replace(Variable.PLAYER, player.getName());
+    replaceAll(oldRank, rank);
+    return this;
+  }
+
+  public MessageBuilder replaceAll(Rank rank) {
+    replace(Variable.RANK, rank.getRank());
+    replace(Variable.RANK_NAME, rank.getName());
+    return this;
+  }
+
+  public MessageBuilder replaceAll(Rank oldRank, Rank rank) {
+    replace(Variable.RANK, rank.getRank());
+    replace(Variable.RANK_NAME, rank.getName());
+    replace(Variable.OLD_RANK, oldRank.getRank());
+    replace(Variable.OLD_RANK_NAME, oldRank.getName());
+    return this;
+  }
+
+  public MessageBuilder replaceCost(CommandSender sender, Economy economy, Rank rank) {
+    Requirement money = rank.getRequirement("money");
+    if(money == null || economy == null) {
+      return this;
+    }
+    replace(Variable.MONEY, money.getAmount());
+    if(sender instanceof Player && rank.isInRank((Player) sender)) {
+      replace(Variable.MONEY_NEEDED, money.getRemaining((Player) sender));
+    } else {
+      replace(Variable.MONEY_NEEDED, money.getAmount());
+    }
+    return this;
+  }
+
+  /**
+   * Fails the MessageBuilder if the message is empty.
+   * if this fails, all subsequent calls to that MessageBuilder will do nothing
+   * @return an EmptyMessageBuilder if the message is empty, itself otherwise
+   */
+  public MessageBuilder failIfEmpty() {
+    if(message.isEmpty()) {
+      return new EmptyMessageBuilder();
+    } else {
+      return this;
+    }
+  }
+
+  public void send(CommandSender sender) {
+    sender.sendMessage(message);
+  }
+
+  /**
+   * Sends the message to all players
+   * ie, calls MessageBuilder#send(Player) for all players online, and sends the message in the console.
+   */
+  public void broadcast() {
+    for(Player player : Bukkit.getOnlinePlayers()) {
+      send(player);
+    }
+    send(Bukkit.getConsoleSender());
+  }
+
+  @Override
+  public String toString() {
+    return message;
+  }
+}

src/main/java/sh/okx/rankup/messages/Variable.java

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+package sh.okx.rankup.messages;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public enum Variable {
+  PLAYER,
+  OLD_RANK,
+  OLD_RANK_NAME,
+  RANK,
+  RANK_NAME,
+  MONEY,
+  MONEY_NEEDED,
+  PERCENT_DONE,
+  PERCENT_LEFT;
+
+  public static Variable getVariable(String name) {
+    for(Variable variable : values()) {
+      if(variable.toString().equalsIgnoreCase(name)) {
+        return variable;
+      }
+    }
+    return null;
+  }
+
+  public String replace(String message, String value) {
+    Pattern pattern = Pattern.compile("\\{" + this + "}", Pattern.CASE_INSENSITIVE);
+    Matcher matcher = pattern.matcher(message);
+    return matcher.replaceAll(value);
+  }
+}