First Admin Panel implementation...

Add all buttons (empty) that will be in the Panel.

Implement confirmation Conversation that requires user input for certain operations.

src/main/java/world/bentobox/magiccobblestonegenerator/commands/admin/GeneratorAdminCommand.java

@@ -15,6 +15,7 @@
 import world.bentobox.bentobox.database.objects.Island;
 import world.bentobox.bentobox.util.Util;
 import world.bentobox.magiccobblestonegenerator.StoneGeneratorAddon;
+import world.bentobox.magiccobblestonegenerator.panels.admin.GeneratorAdminPanel;
 import world.bentobox.magiccobblestonegenerator.utils.Constants;
 import world.bentobox.magiccobblestonegenerator.utils.Utils;
 
@@ -73,15 +74,14 @@ public void setup()
 	@Override
 	public boolean execute(User user, String label, List<String> args)
 	{
-//		if (args.isEmpty())
-//		{
-// 			TODO: Need to create and implement admin command.
-//			AdminPanel.openPanel(this.getAddon(), this.getWorld(), user);
-//		}
-//		else
-//		{
-//			this.showHelp(this, user);
-//		}
+		if (args.isEmpty())
+		{
+			GeneratorAdminPanel.openPanel(this.getAddon(), this.getWorld(), user);
+		}
+		else
+		{
+			this.showHelp(this, user);
+		}
 
 		this.showHelp(this, user);
 

src/main/java/world/bentobox/magiccobblestonegenerator/panels/ConversationUtils.java

@@ -0,0 +1,168 @@
+//
+// Created by BONNe
+// Copyright - 2020
+//
+
+
+package world.bentobox.magiccobblestonegenerator.panels;
+
+
+import org.apache.commons.lang.ArrayUtils;
+import org.bukkit.conversations.*;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import java.util.function.Consumer;
+
+import world.bentobox.bentobox.BentoBox;
+import world.bentobox.bentobox.api.user.User;
+import world.bentobox.magiccobblestonegenerator.utils.Constants;
+import world.bentobox.magiccobblestonegenerator.utils.Utils;
+
+
+public class ConversationUtils
+{
+	// ---------------------------------------------------------------------
+// Section: Conversation API implementation
+// ---------------------------------------------------------------------
+
+
+	/**
+	 * This method will close opened gui and writes inputText in chat. After players answers on
+	 * inputText in chat, message will trigger consumer and gui will reopen.
+	 * Success and fail messages can be implemented like that, as user's chat options are disabled
+	 * while it is in conversation.
+	 * @param consumer Consumer that accepts player output text.
+	 * @param question Message that will be displayed in chat when player triggers conversion.
+	 * @param successMessage Message that will be displayed on successful operation.
+	 * @param failMessage Message that will be displayed on failed operation.
+	 * @param user User who is targeted with current confirmation.
+	 */
+	public static void createConfirmation(Consumer<Boolean> consumer,
+		@NotNull String question,
+		@Nullable String successMessage,
+		@Nullable String failMessage,
+		User user)
+	{
+		ValidatingPrompt confirmationPrompt = new ValidatingPrompt()
+		{
+			/**
+			 * Is input valid boolean.
+			 *
+			 * @param context the context
+			 * @param input the input
+			 * @return the boolean
+			 */
+			protected boolean isInputValid(@NotNull ConversationContext context, @NotNull String input)
+			{
+				String[] accepted = new String[]{
+					"true", "false",
+					"on", "off",
+					"yes", "no",
+					"y", "n",
+					"1", "0",
+					"right", "wrong",
+					"correct", "incorrect",
+					"valid", "invalid",
+					"confirm", "deny",
+					"cancel",
+					"exit"
+				};
+				return ArrayUtils.contains(accepted, input.toLowerCase());
+			}
+
+
+			/**
+			 * Accept validated input prompt.
+			 *
+			 * @param context the context
+			 * @param input the input
+			 * @return the prompt
+			 */
+			@Nullable
+			protected Prompt acceptValidatedInput(@NotNull ConversationContext context, @NotNull String input)
+			{
+				if (input.equalsIgnoreCase("true") ||
+					input.equalsIgnoreCase("on") ||
+					input.equalsIgnoreCase("yes") ||
+					input.equalsIgnoreCase("y") ||
+					input.equals("1") ||
+					input.equalsIgnoreCase("right") ||
+					input.equalsIgnoreCase("correct") ||
+					input.equalsIgnoreCase("valid") ||
+					input.equalsIgnoreCase("confirm"))
+				{
+					// Add answer to consumer.
+					consumer.accept(true);
+
+					if (successMessage != null)
+					{
+						// Return message about successful operation.
+						return new MessagePrompt()
+						{
+							@Override
+							protected @Nullable Prompt getNextPrompt(@NotNull ConversationContext context)
+							{
+								return Prompt.END_OF_CONVERSATION;
+							}
+
+
+							@Override
+							public @NotNull String getPromptText(@NotNull ConversationContext context)
+							{
+								return successMessage;
+							}
+						};
+					}
+				}
+				else
+				{
+					// Add answer to consumer.
+					consumer.accept(false);
+
+					// Return message about failed operation.
+					if (failMessage != null)
+					{
+						return new MessagePrompt()
+						{
+							@Override
+							protected @Nullable Prompt getNextPrompt(@NotNull ConversationContext context)
+							{
+								return Prompt.END_OF_CONVERSATION;
+							}
+
+
+							@Override
+							public @NotNull String getPromptText(@NotNull ConversationContext context)
+							{
+								return failMessage;
+							}
+						};
+					}
+				}
+
+				return Prompt.END_OF_CONVERSATION;
+			}
+
+
+			/**
+			 * @see Prompt#getPromptText(ConversationContext)
+			 */
+			@Override
+			public @NotNull String getPromptText(@NotNull ConversationContext conversationContext)
+			{
+				// Close input GUI.
+				user.closeInventory();
+				// There are no editable message. Just return question.
+				return question;
+			}
+		};
+
+		Conversation conversation = new ConversationFactory(BentoBox.getInstance()).
+			withFirstPrompt(confirmationPrompt).
+			withLocalEcho(false).
+			withPrefix(context -> user.getTranslation(Constants.QUESTIONS + "prefix")).
+			buildConversation(user.getPlayer());
+
+		conversation.begin();
+	}
+}