1 files changed, 49 insertions, 0 deletions
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/predef/PredefinedCommand.java b/dicore3/command/src/main/java/io/dico/dicore/command/predef/PredefinedCommand.java
new file mode 100644
index 0000000..4e7ba07
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/predef/PredefinedCommand.java
@@ -0,0 +1,49 @@
+package io.dico.dicore.command.predef;
+
+import io.dico.dicore.command.CommandBuilder;
+import io.dico.dicore.command.ExtendedCommand;
+import io.dico.dicore.command.ICommandAddress;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Consumer;
+
+/**
+ * Marker class for commands that are generated. These commands can be replaced using methods in {@link CommandBuilder}
+ */
+public abstract class PredefinedCommand<T extends PredefinedCommand<T>> extends ExtendedCommand<T> {
+    static final Map<String, Consumer<ICommandAddress>> predefinedCommandGenerators = new HashMap<>();
+
+    /**
+     * Get a predefined command
+     *
+     * @param name the name
+     * @return the subscriber
+     */
+    public static Consumer<ICommandAddress> getPredefinedCommandGenerator(String name) {
+        return predefinedCommandGenerators.get(name);
+    }
+
+    /**
+     * Register a predefined command
+     *
+     * @param name     the name
+     * @param consumer the generator which adds the child to the address
+     * @return true if and only if the subscriber was registered (false if the name exists)
+     */
+    public static boolean registerPredefinedCommandGenerator(String name, Consumer<ICommandAddress> consumer) {
+        return predefinedCommandGenerators.putIfAbsent(name, consumer) == null;
+    }
+
+    static {
+        registerPredefinedCommandGenerator("help", HelpCommand::registerAsChild);
+        registerPredefinedCommandGenerator("syntax", SyntaxCommand::registerAsChild);
+    }
+
+    public PredefinedCommand() {
+    }
+
+    public PredefinedCommand(boolean modifiable) {
+        super(modifiable);
+    }
+}