Coordinates saving validation

src/main/java/dev/protron/coordsave/CoordSave.java

@@ -10,10 +10,13 @@ import org.bukkit.plugin.java.JavaPlugin;
 import org.bukkit.util.StringUtil;
 import org.jetbrains.annotations.NotNull;
 
+
 import java.io.File;
 import java.sql.*;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
+
 
 import static net.kyori.adventure.text.Component.text;
 import static net.kyori.adventure.text.format.NamedTextColor.*;
@@ -51,29 +54,62 @@ public class CoordSave extends JavaPlugin {
     }
 
     public void doSaveSubcommand(Player player, String coordname) throws SQLException {
+
         Location location = player.getLocation();
         String playerUUID = player.getUniqueId().toString();
 
-        // Preparing the query string
-        String query = "INSERT INTO coords (uuid, coordname, X, Y, Z) VALUES(?, ?, ?, ?, ?)";
-        PreparedStatement pstmt = connection.prepareStatement(query);
-        pstmt.setString(1, playerUUID);
-        pstmt.setString(2, coordname);
-        pstmt.setFloat(3, location.getBlockX());
-        pstmt.setFloat(4, location.getBlockY());
-        pstmt.setFloat(5, location.getBlockZ());
+        String checkQuery = "SELECT * FROM coords WHERE uuid = ? and coordname = ?";
+        PreparedStatement checkPstmt = connection.prepareStatement(checkQuery);
+        checkPstmt.setString(1, playerUUID);
+        checkPstmt.setString(2, coordname);
+        ResultSet checkResult = checkPstmt.executeQuery();
 
-        // Executing the query
-        pstmt.executeUpdate();
+        if (Objects.equals(checkResult.getString("coordname"), coordname)) {
+            TextComponent alreadyExistMessage = text()
+                    .content("A entry with the name ")
+                    .append(text(coordname)).color(TextColor.color(RED))
+                    .append(text("already exists.")).build();
+            player.sendMessage(alreadyExistMessage);
+        } else {
+            // Preparing the query string
+            String query = "INSERT INTO coords (uuid, coordname, X, Y, Z) VALUES(?, ?, ?, ?, ?)";
+            PreparedStatement pstmt = connection.prepareStatement(query);
+            pstmt.setString(1, playerUUID);
+            pstmt.setString(2, coordname);
+            pstmt.setFloat(3, location.getBlockX());
+            pstmt.setFloat(4, location.getBlockY());
+            pstmt.setFloat(5, location.getBlockZ());
 
-        // Building the message component
-        final TextComponent conformationMessage = text()
-                .content("The coordinates for ")
-                .append(text(coordname).color(TextColor.color(BLUE)))
-                .append(text(" where saved!")).build();
+            // Executing the query
+            pstmt.executeUpdate();
 
-        // Sending the message component to player
-        player.sendMessage(conformationMessage);
+            String validateQuery = "SELECT * FROM coords WHERE uuid = ? and coordname = ?";
+            PreparedStatement validatePstmt = connection.prepareStatement(validateQuery);
+            checkPstmt.setString(1, playerUUID);
+            checkPstmt.setString(2, coordname);
+            ResultSet validateResult = validatePstmt.executeQuery();
+
+            if (Objects.equals(validateResult.getString("coordname"), coordname)) {
+                // Building the message component
+                final TextComponent conformationMessage = text()
+                        .content("The coordinates for ")
+                        .append(text(coordname).color(TextColor.color(BLUE)))
+                        .append(text(" where saved!")).build();
+
+                // Sending the message component to player
+                player.sendMessage(conformationMessage);
+            } else {
+                // Building the message component
+                final TextComponent errorSavingMessage = text()
+                    .content("Error saving the ").color(TextColor.color(RED))
+                    .append(text(coordname).color(TextColor.color(RED)))
+                    .append(text(" coordinates!")).color(TextColor.color(RED)).build();
+
+                // Sending the message component to player
+                player.sendMessage(errorSavingMessage);
+
+            }
+        }
     }
 
     public void doShowSubcommand(Player player, String subarg) throws SQLException {