Initial xentral_oss_20.3.c9ffacf

classes/Components/Exporter/Collection/DataCollection.php

@@ -0,0 +1,115 @@
+<?php
+
+namespace Xentral\Components\Exporter\Collection;
+
+use ArrayObject;
+use AppendIterator;
+use Iterator;
+use IteratorAggregate;
+use Xentral\Components\Exporter\Exception\InvalidArgumentException;
+
+final class DataCollection implements Iterator
+{
+    /** @var AppendIterator $data */
+    private $data;
+
+    /**
+     * @param array|Iterator $data
+     *
+     * @throws InvalidArgumentException
+     */
+    public function __construct(...$data)
+    {
+        $this->data = new AppendIterator();
+        foreach ($data as $item) {
+            $this->append($item);
+        }
+    }
+
+    /**
+     * @param array|Iterator|IteratorAggregate $data
+     *
+     * @throws InvalidArgumentException
+     */
+    public function append($data)
+    {
+        $type = gettype($data);
+        if ($type === 'object') {
+            $type = get_class($data);
+            if ($data instanceof Iterator) {
+                $type = 'Iterator';
+            }
+            if ($data instanceof IteratorAggregate) {
+                $type = 'IteratorAggregate';
+            }
+        }
+
+        switch ($type) {
+            case 'array':
+                $this->data->append((new ArrayObject($data))->getIterator());
+                break;
+
+            case 'Iterator':
+                $this->data->append($data);
+                break;
+
+            case 'IteratorAggregate':
+                $this->data->append($data->getIterator());
+                break;
+
+            default:
+                throw new InvalidArgumentException(sprintf('Unsupported type "%s".', $type));
+                break;
+        }
+    }
+
+    /**
+     * Return the current element
+     *
+     * @return mixed Can return any type.
+     */
+    public function current()
+    {
+        return $this->data->current();
+    }
+
+    /**
+     * Move forward to next element
+     *
+     * @return void
+     */
+    public function next()
+    {
+        $this->data->next();
+    }
+
+    /**
+     * Return the key of the current element
+     *
+     * @return mixed scalar on success, or null on failure.
+     */
+    public function key()
+    {
+        return $this->data->key();
+    }
+
+    /**
+     * Checks if current position is valid
+     *
+     * @return boolean Returns true on success or false on failure.
+     */
+    public function valid()
+    {
+        return $this->data->valid();
+    }
+
+    /**
+     * Rewind the Iterator to the first element
+     *
+     * @return void
+     */
+    public function rewind()
+    {
+        $this->data->rewind();
+    }
+}