src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/parser/CommandParser.java

@@ -0,0 +1,15 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.parser;
+
+/**
+ * Parser to convert the PrimitiveRequest to a Request and performing checks for required fields and
+ * data types
+ */
+public interface CommandParser {
+    /**
+     * Parses the provided PrimitiveRequest into a command-specific request
+     *
+     * @param primitiveRequest
+     * @return
+     */
+    Request parse(PrimitiveRequest primitiveRequest);
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/parser/CommandParserDispatcher.java

@@ -0,0 +1,36 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.parser;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/** Dispatcher all CommandParser are registered in */
+public class CommandParserDispatcher {
+    private final Map<String, CommandParser> parsers = new HashMap<>();
+
+    /**
+     * Register a new CommandParser
+     *
+     * @param command
+     * @param parser the parser class
+     */
+    public void register(String command, CommandParser parser) {
+        parsers.put(command, parser);
+    }
+
+    /**
+     * Parses the PrimitiveRequest into a Request using the appropriate CommandParser
+     *
+     * @param primitiveRequest the PrimitiveRequest to parse
+     * @return the parsed Request object
+     */
+    public Request parse(PrimitiveRequest primitiveRequest) {
+        String command = primitiveRequest.command();
+        CommandParser parser = parsers.get(command);
+
+        if (parser == null) {
+            throw new UnknownCommandException(command);
+        }
+
+        return parser.parse(primitiveRequest);
+    }
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/parser/Request.java

@@ -0,0 +1,4 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.parser;
+
+/** Request, produced by the CommandParser */
+public interface Request {}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/parser/UnknownCommandException.java

@@ -0,0 +1,11 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.parser;
+
+/**
+ * Exception thrown when the CommandParserDispatcher has no registered handler for the provided
+ * request
+ */
+public class UnknownCommandException extends RuntimeException {
+    public UnknownCommandException(String message) {
+        super(message);
+    }
+}