mamcache: implement the ArrayAccess interface

lib/memcache/cache.php

@@ -8,7 +8,7 @@
 
 namespace OC\Memcache;
 
-abstract class Cache {
+abstract class Cache implements \ArrayAccess {
 	/**
 	 * @var string $prefix
 	 */
@@ -56,4 +56,22 @@ abstract class Cache {
 	 * @return mixed
 	 */
 	abstract public function clear($prefix = '');
+
+	//implement the ArrayAccess interface
+
+	public function offsetExists($offset) {
+		return $this->hasKey($offset);
+	}
+
+	public function offsetSet($offset, $value) {
+		$this->set($offset, $value);
+	}
+
+	public function offsetGet($offset) {
+		return $this->get($offset);
+	}
+
+	public function offsetUnset($offset) {
+		$this->remove($offset);
+	}
 }

tests/lib/memcache/cache.php

@@ -28,6 +28,28 @@ class Cache extends \Test_Cache {
 		$this->assertFalse($this->instance->hasKey('foo'));
 	}
 
+	public function testArrayAccessSet() {
+		$this->instance['foo'] = 'bar';
+		$this->assertEquals('bar', $this->instance->get('foo'));
+	}
+
+	public function testArrayAccessGet() {
+		$this->instance->set('foo', 'bar');
+		$this->assertEquals('bar', $this->instance['foo']);
+	}
+
+	public function testArrayAccessExists() {
+		$this->assertFalse(isset($this->instance['foo']));
+		$this->instance->set('foo', 'bar');
+		$this->assertTrue(isset($this->instance['foo']));
+	}
+
+	public function testArrayAccessUnset() {
+		$this->instance->set('foo', 'bar');
+		unset($this->instance['foo']);
+		$this->assertFalse($this->instance->hasKey('foo'));
+	}
+
 	public function tearDown() {
 		if ($this->instance) {
 			$this->instance->clear();