Add meta information

Author: thekid

src/main/php/io/Blob.class.php

@@ -9,14 +9,16 @@
 class Blob implements IteratorAggregate, Value {
   private $parts;
   private $iterator= null;
+  public $meta= [];
 
   /**
    * Creates a new blob from parts
    *
    * @param  iterable|string|util.Bytes|io.streams.InputStream $parts
+   * @param  [:var] $meta
    * @throws lang.IllegalArgumentException
    */
-  public function __construct($parts= []) {
+  public function __construct($parts= [], array $meta= []) {
     if ($parts instanceof InputStream) {
       $this->iterator= function() {
         static $started= false;
@@ -44,6 +46,7 @@ public function __construct($parts= []) {
     }
 
     $this->parts= $parts;
+    $this->meta= $meta;
   }
 
   /** @return iterable */

src/test/php/io/unittest/BlobTest.class.php

@@ -32,6 +32,17 @@ public function not_from_null() {
     new Blob(null);
   }
 
+  #[Test]
+  public function meta_empty_by_default() {
+    Assert::equals([], (new Blob('Test'))->meta);
+  }
+
+  #[Test]
+  public function meta() {
+    $meta= ['type' => 'text/plain'];
+    Assert::equals($meta, (new Blob('Test', $meta))->meta);
+  }
+
   #[Test, Values(from: 'cases')]
   public function iteration($fixture, $expected) {
     Assert::equals($expected, iterator_to_array($fixture));