Implement Command Registry

src/main/java/org/telegram/telegrambots/api/commands/CommandRegistry.java

@@ -0,0 +1,86 @@
+package org.telegram.telegrambots.api.commands;
+
+import org.telegram.telegrambots.api.objects.Message;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author tschulz
+ */
+public final class CommandRegistry implements ICommandRegistery {
+
+    private final Map<String, Command> commandRegistryMap = new HashMap<>();
+
+    public CommandRegistry(String botToken) {
+        register(new HelpCommand(this, botToken));
+    }
+
+    @Override
+    public final boolean register(Command command) {
+        if (commandRegistryMap.containsKey(command.getCommandIdentifier())) {
+            return false;
+        }
+        commandRegistryMap.put(command.getCommandIdentifier(), command);
+        return true;
+    }
+
+    @Override
+    public final Map<Command, Boolean> registerAll(Command... commands) {
+        Map<Command, Boolean> resultMap = new HashMap<>(commands.length);
+        for (Command command : commands) {
+            resultMap.put(command, register(command));
+        }
+        return resultMap;
+    }
+
+    @Override
+    public final boolean deregister(Command command) {
+        if (commandRegistryMap.containsKey(command.getCommandIdentifier())) {
+            commandRegistryMap.remove(command.getCommandIdentifier());
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public final Map<Command, Boolean> deregisterAll(Command... commands) {
+        Map<Command, Boolean> resultMap = new HashMap<>(commands.length);
+        for (Command command : commands) {
+            resultMap.put(command, deregister(command));
+        }
+        return resultMap;
+    }
+
+    @Override
+    public final Collection<Command> getRegisteredCommands() {
+        return commandRegistryMap.values();
+    }
+
+    /**
+     * executes a command if present and replies the success
+     *
+     * @param message input message
+     * @return        true if success or false otherwise
+     */
+    public final boolean executeCommand(Message message) {
+        if (message.hasText()) {
+            String text = message.getText();
+            if (!text.isEmpty() && text.startsWith(Command.COMMAND_INIT_CHARACTER)) {
+                String commandMessage = text.substring(1);
+                String[] commandSplit = commandMessage.split(Command.COMMAND_PARAMETER_SEPERATOR);
+
+                String command = commandSplit[0];
+
+                if (commandRegistryMap.containsKey(command)) {
+                    String[] parameters = Arrays.copyOfRange(commandSplit, 1, commandSplit.length);
+                    commandRegistryMap.get(command).execute(parameters, message.getChatId());
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}