first commit

src/main/java/de/kencommand/impl/structure/argument/CommandArgumentImpl.java

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+package de.kencommand.impl.structure.argument;
+
+import de.kencommand.api.processing.CommandContext;
+import de.kencommand.api.structure.argument.ArgumentType;
+import de.kencommand.api.structure.argument.CommandArgument;
+import de.kencommand.api.structure.argument.SuggestionProvider;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+import org.jetbrains.annotations.Nullable;
+
+@RequiredArgsConstructor
+public class CommandArgumentImpl<T, S extends CommandContext<T>, V> implements CommandArgument<T, S, V> {
+
+    @Getter
+    private final String id;
+    @Getter
+    private final ArgumentType<V> type;
+
+    @Getter
+    @Setter
+    private @Nullable T defaultValue;
+
+    @Getter
+    @Setter
+    private @Nullable SuggestionProvider<T, S> suggestionProvider;
+}

src/main/java/de/kencommand/impl/structure/node/LiteralNodeImpl.java

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+package de.kencommand.impl.structure.node;
+
+import de.kencommand.api.processing.CommandContext;
+import de.kencommand.api.structure.node.CommandNode;
+import de.kencommand.api.structure.node.LiteralNode;
+import lombok.Getter;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class LiteralNodeImpl<T, S extends CommandContext<T>> implements LiteralNode<T, S> {
+
+    @Getter
+    private final Set<CommandNode<? extends T, ? extends S>> literals = new HashSet<>();
+
+    @Override
+    public void addLiteral(@NotNull CommandNode<? extends T, ? extends S> commandNode) {
+        for (String name : commandNode.getNames()) {
+            if (getLiteral(name) != null) throw new IllegalArgumentException("literal with same name is already added");
+        }
+        literals.add(commandNode);
+    }
+
+    @Override
+    public CommandNode<? extends T, ? extends S> getLiteral(@NotNull String name) {
+        for (var literal : literals) {
+            for (String literalName : literal.getNames()) {
+                if (literalName.equalsIgnoreCase(name)) return literal;
+            }
+        }
+        return null;
+    }
+}