Java Question How to wrote a wrapper for a nested Builder class?

DonManfred

Expert
Licensed User
I have a Builderclass in my newest project, the jTelegramBot, which is kind of a Nested Builder with some subclasses.

B4X:
/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Fouad Almalki
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package io.fouad.jtb.core.builders;

import io.fouad.jtb.core.beans.InlineKeyboardButton;

import java.util.ArrayList;
import java.util.List;

/**
 * A builder class to build 2D array of <code>InlineKeyboardButton</code> objects.
 */
public class InlineKeyboardButtonBuilder
{
    /**
     * Starts a new row of the inline keyboard.
     */
    public static Row newRow() // first row
    {
        List<List<InlineKeyboardButton>> twoDimensionKeyboardButtons = new ArrayList<List<InlineKeyboardButton>>();
        return new Row(twoDimensionKeyboardButtons);
    }
   
    public static class Row
    {
        private List<List<InlineKeyboardButton>> twoDimensionInlineKeyboardButtons;
        private List<InlineKeyboardButton> rowInlineKeyboardButtons = new ArrayList<InlineKeyboardButton>();
       
        private Row(List<List<InlineKeyboardButton>> twoDimensionInlineKeyboardButtons)
        {
            this.twoDimensionInlineKeyboardButtons = twoDimensionInlineKeyboardButtons;
            this.twoDimensionInlineKeyboardButtons.add(rowInlineKeyboardButtons);
        }
       
        /**
         * Adds a new button in the row.
         *
         * @param text text of the new button
         */
        public ButtonSet newButton(String text) // first button
        {
            InlineKeyboardButton firstInlineKeyboardButton = new InlineKeyboardButton(text, null, null, null);
           
            return new ButtonSet(twoDimensionInlineKeyboardButtons, rowInlineKeyboardButtons, firstInlineKeyboardButton);
        }
       
        /**
         * Builds the inline keyboard.
         *
         * @return the inline keyboard
         */
        public InlineKeyboardButton[][] build()
        {
            return InlineKeyboardButtonBuilder.build(twoDimensionInlineKeyboardButtons);
        }
    }
   
    public static class ButtonSet
    {
        private List<List<InlineKeyboardButton>> twoDimensionInlineKeyboardButtons;
        private List<InlineKeyboardButton> rowInlineKeyboardButtons;
        private InlineKeyboardButton currentInlineKeyboardButton;
       
        private ButtonSet(List<List<InlineKeyboardButton>> twoDimensionInlineKeyboardButtons, List<InlineKeyboardButton> rowInlineKeyboardButtons,
                          InlineKeyboardButton firstInlineKeyboardButton)
        {
            this.twoDimensionInlineKeyboardButtons = twoDimensionInlineKeyboardButtons;
            this.rowInlineKeyboardButtons = rowInlineKeyboardButtons;
            this.currentInlineKeyboardButton = firstInlineKeyboardButton;
        }
       
        /**
         * Adds a new button in the row.
         *
         * @param text text of the new button
         */
        public ButtonSet newButton(String text)
        {
            rowInlineKeyboardButtons.add(currentInlineKeyboardButton);
            currentInlineKeyboardButton = new InlineKeyboardButton(text, null, null, null);
           
            return this;
        }
       
        /**
         * HTTP url to be opened when button is pressed
         *
         * @param url the url
         */
        public ButtonSetWithNoOptional withUrl(String url)
        {
            currentInlineKeyboardButton.setUrl(url);
           
            return new ButtonSetWithNoOptional(this);
        }
       
        /**
         * Data to be sent in a callback query to the bot when button is pressed, 1-64 bytes.
         *
         * @param callbackData the callback data
         */
        public ButtonSetWithNoOptional withCallbackData(String callbackData)
        {
            currentInlineKeyboardButton.setCallbackData(callbackData);
           
            return new ButtonSetWithNoOptional(this);
        }
       
        /**
         * If set, pressing the button will prompt the user to select one of their chats, open
         * that chat and insert the bot‘s username and the specified inline query in the input
         * field. Can be empty, in which case just the bot’s username will be inserted.
         *
         * @param switchInlineQuery the inline query
         */
        public ButtonSetWithNoOptional withSwitchInlineQuery(String switchInlineQuery)
        {
            currentInlineKeyboardButton.setSwitchInlineQuery(switchInlineQuery);
           
            return new ButtonSetWithNoOptional(this);
        }
       
        /**
         * Starts a new row of the inline keyboard.
         */
        public Row newRow()
        {
            rowInlineKeyboardButtons.add(currentInlineKeyboardButton);
           
            return new Row(twoDimensionInlineKeyboardButtons);
        }
       
        /**
         * Builds the inline keyboard.
         *
         * @return the inline keyboard
         */
        public InlineKeyboardButton[][] build()
        {
            return InlineKeyboardButtonBuilder.build(twoDimensionInlineKeyboardButtons);
        }
    }
   
    public static class ButtonSetWithNoOptional
    {
        private ButtonSet currentButtonSet;
       
        private ButtonSetWithNoOptional(ButtonSet currentButtonSet)
        {
            this.currentButtonSet = currentButtonSet;
        }
       
        /**
         * Adds a new button in the row.
         *
         * @param text text of the new button
         */
        public ButtonSet newButton(String text)
        {
            return currentButtonSet.newButton(text);
        }
       
        /**
         * Starts a new row of the inline keyboard.
         */
        public Row newRow()
        {
            return currentButtonSet.newRow();
        }
       
        /**
         * Builds the inline keyboard.
         *
         * @return the inline keyboard
         */
        public InlineKeyboardButton[][] build()
        {
            return currentButtonSet.build();
        }
    }
       
    private static InlineKeyboardButton[][] build(List<List<InlineKeyboardButton>> twoDimensionKeyboardButtons)
    {
        int outerArrayLength = twoDimensionKeyboardButtons.size();
        InlineKeyboardButton[][] array = new InlineKeyboardButton[outerArrayLength][];
       
        for(int i = 0; i < outerArrayLength; i++)
        {
            List<InlineKeyboardButton> rowKeyboardButtons = twoDimensionKeyboardButtons.get(i);
            int innerArrayLength = rowKeyboardButtons.size();
           
            array[i] = new InlineKeyboardButton[innerArrayLength];
           
            for(int j = 0; j < innerArrayLength; j++)
            {
                array[i][j] = rowKeyboardButtons.get(j);
            }
        }
       
        return array;
    }
}
In fact they are not much methods but i´m not sure how to write a Nested Builder wrapper for it.

Can anyone give me some hints or suggestions?

Using the Builder in Java is not problem. But i need to make it available to the B4J User.

B4X:
    public InlineKeyboardButton[][] CreateDummyKeyboard()    {
        Row row1 = InlineKeyboardButtonBuilder.newRow();
        
        row1.newButton("BTN1").withCallbackData("BTN1")
        .newButton("BTN2").withCallbackData("BTN2")
        .newButton("BTN3").withCallbackData("BTN3")
        .newButton("BTN4").withCallbackData("BTN4")
        .newButton("BTN5").withCallbackData("BTN5")
        .newRow()
        .newButton("BTN6").withSwitchInlineQuery("BTN6IQ")
        .newButton("BTN7").withSwitchInlineQuery("BTN7IQ")
        .newButton("BTN8").withSwitchInlineQuery("BTN8IQ")
        .newButton("BTN9").withSwitchInlineQuery("BTN9IQ")
        .newButton("BTN10").withSwitchInlineQuery("BTN10IQ")
        .newRow()
        .newButton("Forum").withUrl("https://www.b4x.com/android/forum/")
        .newButton("DonManfreds Overview").withUrl("https://www.b4x.com/android/forum/threads/donmanfreds-overview.54618/")
        .newButton("Bot").withUrl("https://t.me/donmanfred_bot")
        .newButton("JTB").withUrl("https://www.b4x.com/android/forum/threads/beta-jtelegrambot-create-your-own-telegram-bot.103821/")
        .newRow();

        return row1.build();
    }
 
Last edited:

DonManfred

Expert
Licensed User
There is nothing special with static nested classes. They behave exactly like non-nested classes.
Thank you! Based on your answer i wrote a wrapper like i was thinking it should be written...

WORKS :)

B4X:
        Dim ibld As InlineKeyboardButtonBuilder
        Dim mark As InlineKeyboardMarkup
        mark.initialize(ibld.Initialize.newRow.newButton("1").withCallbackData("BTN1").newButton("2").withCallbackData("BTN2").newButton("3").withCallbackData("BTN3").newRow.newButton("Google").withUrl("https://www.google.com").newRow.build)
        Dim buttons As Message = jtb.sendMessage(jtb.byId(from.Id),"Click the Button!","MARKDOWN",False,False,message.MessageId,mark)
 
Last edited:
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