From 7fe4c65820d012d684405c56942b01da8e77bd23 Mon Sep 17 00:00:00 2001
From: Anatoliy Sablin
Date: Mon, 6 Nov 2017 16:34:39 +0300
Subject: Added help command.

---
 .../src/main/java/com/juick/command/Processor.java | 19 +++-----
 .../src/main/java/com/juick/command/ShowHelp.java  | 52 ++++++++++++++++++++++
 2 files changed, 57 insertions(+), 14 deletions(-)
 create mode 100644 juick-commands/src/main/java/com/juick/command/ShowHelp.java

diff --git a/juick-commands/src/main/java/com/juick/command/Processor.java b/juick-commands/src/main/java/com/juick/command/Processor.java
index 51ce2830..60815d16 100644
--- a/juick-commands/src/main/java/com/juick/command/Processor.java
+++ b/juick-commands/src/main/java/com/juick/command/Processor.java
@@ -11,8 +11,6 @@ import org.springframework.stereotype.Component;
 
 import java.util.Set;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
-import javax.annotation.PostConstruct;
 
 /**
  * @author ma1uta
@@ -26,30 +24,23 @@ public class Processor {
     private final Set<Command> commands;
     @Setter
     private ProtocolListener protocolListener;
-    private String help;
 
     @Autowired
     public Processor(Set<Command> commands) {
         this.commands = commands;
     }
 
-    @PostConstruct
-    public void init() {
-        this.help =
-            "HELP - returns this help message.\n" + getCommands().stream().map(Command::help).sorted().collect(Collectors.joining("\n"));
-    }
-
     public String execute(User sender, String command) {
         if (LOGGER.isDebugEnabled()) {
             LOGGER.debug("Execute command: {}", command);
         }
         command = command != null ? command.trim() : "";
-        if ("help".equalsIgnoreCase(command)) {
-            LOGGER.debug("Show help");
-            return getHelp();
-        }
         Command defaultCommand = null;
+        Command helpCommand = null;
         for (Command commandItem : getCommands()) {
+            if (commandItem instanceof ShowHelp) {
+                helpCommand = commandItem;
+            }
             Pattern pattern = commandItem.pattern();
             if (pattern != null && pattern.matcher(command).matches()) {
                 if (LOGGER.isDebugEnabled()) {
@@ -68,6 +59,6 @@ public class Processor {
             return defaultCommand.execute(sender, getProtocolListener(), command);
         }
         LOGGER.debug("Command processor not found, return help");
-        return getHelp();
+        return helpCommand != null ? helpCommand.execute(sender, getProtocolListener(), command) : "Help not found";
     }
 }
diff --git a/juick-commands/src/main/java/com/juick/command/ShowHelp.java b/juick-commands/src/main/java/com/juick/command/ShowHelp.java
new file mode 100644
index 00000000..78e01706
--- /dev/null
+++ b/juick-commands/src/main/java/com/juick/command/ShowHelp.java
@@ -0,0 +1,52 @@
+package com.juick.command;
+
+import com.juick.User;
+import com.juick.server.protocol.ProtocolListener;
+import lombok.Getter;
+import org.springframework.beans.BeansException;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.stereotype.Component;
+
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+import javax.annotation.PostConstruct;
+
+/**
+ * @author ma1uta
+ */
+@Component
+@Getter
+public class ShowHelp implements Command, ApplicationContextAware {
+
+    private static final Pattern PATTERN = Pattern.compile("^help$", Pattern.CASE_INSENSITIVE);
+
+    private ApplicationContext applicationContext;
+    private String help;
+
+    @PostConstruct
+    public void init() {
+        help = getApplicationContext().getBeansOfType(Command.class).values().stream().map(Command::help).sorted()
+            .collect(Collectors.joining("\n"));
+    }
+
+    @Override
+    public Pattern pattern() {
+        return PATTERN;
+    }
+
+    @Override
+    public String help() {
+        return "HELP - returns this help message.";
+    }
+
+    @Override
+    public String execute(User sender, ProtocolListener protocolListener, String command) {
+        return getHelp();
+    }
+
+    @Override
+    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
+        this.applicationContext = applicationContext;
+    }
+}
-- 
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