2 files changed, 84 insertions, 0 deletions
diff --git a/src/Core/ClassValidationArray.php b/src/Core/ClassValidationArray.php
new file mode 100644
index 0000000..fabe687
--- /dev/null
+++ b/src/Core/ClassValidationArray.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace IP1\RESTClient\Core;
+
+/**
+*
+* An extension of ArrayObject that ensures that there's only one type of object in the array.
+* @package IP1\RESTClient\Core
+*/
+class ClassValidationArray extends \ArrayObject implements \JsonSerializable
+{
+
+    /**
+    * Stores the only allowed class that is allowed in the array.
+    * @var string $class
+    */
+    private $class;
+    /**
+    * @throws InvalidArgumentException
+    */
+    public function __construct($input = [])
+    {
+        if (is_array($input)) {
+            foreach ($input as $key => $value) {
+                if (!is_object($value)) {
+                    throw new \InvalidArgumentException(
+                        get_class($value).
+                        " is not the same class as ".
+                        $this->class .
+                        " given in the first index of argument array."
+                    );
+                }
+                if (!isset($this->class)) {
+                    $this->class = get_class($value);
+                }
+                if ($this->class === get_class($value)) {
+                    parent::offsetSet(null, $value);
+                } else {
+                    throw new \InvalidArgumentException($this->class. " expected as set by the first index in given array. " . get_class($value) . " given in index $key of given array.");
+                }
+            }
+        } elseif (is_object($input)) {
+            $this->class = get_class($input);
+            parent::offsetSet(null, $input);
+        } else {
+            throw new \InvalidArgumentException(gettype($input). " given argument was not an array or an object.");
+        }
+    }
+
+    /**
+    *  Sets the value at the specified index to value if
+    * @throws InvalidArgumentException
+    */
+    public function offsetSet($index, $value): void
+    {
+        if (!is_object($value)) {
+            throw new \InvalidArgumentException("Excepcted object, ". gettype($value) ." given.");
+        }
+        if (!isset($this->class)) {
+            $this->class = get_class($value);
+        }
+        if (get_class($value) === $this->class) {
+            parent::offsetSet($index, $value);
+        } else {
+            throw new \InvalidArgumentException("Excepcted $this->class, ". get_class($value) ." given.");
+        }
+    }
+    public function getContainedClass(): string
+    {
+        return $this->class;
+    }
+     /**
+      * {@inheritDoc}
+      */
+    public function JsonSerialize(): array
+    {
+        $returnArray = [];
+        foreach ($this->getArrayCopy() as $value) {
+            $returnArray[] = $value->JsonSerialize();
+        }
+        return $returnArray;
+    }
+}
diff --git a/src/Core/ProcessedComponent.php b/src/Core/ProcessedComponent.php
index 787d29c..dc2f530 100644
--- a/src/Core/ProcessedComponent.php
+++ b/src/Core/ProcessedComponent.php
@@ -26,6 +26,7 @@ interface ProcessedComponent extends \JsonSerializable
     public function getCreated(\DateTimeZone $timezone = null): ?\DateTime;
     /**
      * Serializes the object to a value that can be serialized natively by json_encode().
+     * @link http://php.net/manual/en/jsonserializable.jsonserialize.php
      */
     public function jsonSerialize(): array;
 }