Added Mapping functionality

src/Alias/Model/Mapping.php

@@ -0,0 +1,63 @@
+<?php
+namespace ProVM\Alias\Model;
+
+use ProVM\Concept\Model;
+
+abstract class Mapping implements \ProVM\Concept\Model\Mapping
+{
+    protected string $input;
+    protected string $output;
+    protected \Closure $transformation;
+
+    public function getInputName(): string
+    {
+        return $this->input;
+    }
+    public function getOutputName(): string
+    {
+        return $this->output;
+    }
+    public function getTransformation(): callable
+    {
+        return $this->transformation;
+    }
+
+    public function setInputName(string $input): \ProVM\Concept\Model\Mapping
+    {
+        $this->input = $input;
+        return $this;
+    }
+    public function setOutputName(string $output): \ProVM\Concept\Model\Mapping
+    {
+        $this->output = $output;
+        return $this;
+    }
+    public function setTransformation(callable $transformation): \ProVM\Concept\Model\Mapping
+    {
+        $this->transformation = $transformation;
+        return $this;
+    }
+
+    public function __invoke(mixed $input, mixed &$output, ?array $params = null): void
+    {
+        if (is_array($input)) {
+            $input_value = $input[$this->getInputName()];
+        }
+        if (is_a($input, Model::class)) {
+            $input_value = $input->{$this->getInputName()}();
+        }
+
+        $args = [$input_value];
+        if ($params !== null) {
+            $args = array_merge($args, $params);
+        }
+        $output_value = call_user_func_array($this->getTransformation(), $args);
+
+        if (is_array($output)) {
+            $output[$this->getOutputName()] = $output_value;
+        }
+        if (is_a($output, Model::class)) {
+            $output->{$this->getOutputName()}($output_value);
+        }
+    }
+}