Add CommandMessage class

This class adds argument functionality to a given message that a user typed, that also counts as a command

telegrambots-extensions/src/main/java/org/telegram/telegrambots/extensions/bots/commandbot/CommandMessage.java

@@ -0,0 +1,74 @@
+package org.telegram.telegrambots.extensions.bots.commandbot;
+
+import org.telegram.telegrambots.meta.api.objects.Message;
+
+/**
+ * @author Varun Singh
+ * This class adds argument functionality to a given message that a user typed, that also counts as a command
+ */
+public class CommandMessage {
+    /** 
+     * The message associated with the command
+     */
+    private Message commandMessage;
+
+    /**
+     * Constructor for CommandMessage
+     * @param msg The message that represents the command that the user typed
+     * Preconditions: 
+        * msg.isCommand() is true
+        * msg.hasText() is true
+     * Postcondition:
+        * The developer has the ability to determine which command the message is executing
+     */
+    public CommandMessage(Message msg) {
+        commandMessage = msg;
+    }
+
+    public Message getCommandMessage() {
+        return commandMessage;
+    }
+
+    /**
+     * @return the String representation of the message for ease
+     */
+    public String getMessageText() {
+        return commandMessage.getText();
+    }
+    
+    /**
+     * Separates the given text after the command into an ordered array of arguments
+     * @return each argument as a String item in an array
+     */
+    public String[] getArgs() {
+        return getArgsStr().split(" ");
+    }
+    
+    /**
+     * @return the text of the command WITHOUT the slash
+     * For example, if /language English
+     */
+    public String getCommandText() {
+        return getCommandText(false).substring(1);     
+    }
+    
+    /**
+     * @return The text of the message from and including the '/' to the space,
+     * which assumes the end of the command name and start of the command arguments
+     */
+    public String getCommandText(boolean includeHandle) {
+        if (includeHandle || commandMessage.isUserMessage()) {
+            return getMessageText().substring(0, getMessageText().indexOf(" "));
+        } else
+            return getMessageText().substring(0, getMessageText().indexOf("@"));
+    }
+
+    /**
+     * Singles out the text of the message after the command
+     * @return all the arguments grouped in one string
+     */
+    public String getArgsStr() {
+        return getMessageText().substring(getCommandText(true).length() + 1); // Skip space
+    }
+
+}