add AcceptFilter

src/main/php/net/stubbles/input/filter/AcceptFilter.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * This file is part of stubbles.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @package  net\stubbles\input
+ */
+namespace net\stubbles\input\filter;
+use net\stubbles\input\Filter;
+use net\stubbles\input\Param;
+use net\stubbles\lang\BaseObject;
+use net\stubbles\peer\http\AcceptHeader;
+/**
+ * Filters accept headers.
+ *
+ * @since  2.0.0
+ */
+class AcceptFilter extends BaseObject implements Filter
+{
+    /**
+     * apply filter on given param
+     *
+     * @param   Param  $param
+     * @return  AcceptHeader
+     */
+    public function apply(Param $param)
+    {
+        if ($param->isNull() || $param->isEmpty()) {
+            return new AcceptHeader();
+        }
+
+        try {
+            return AcceptHeader::parse($param->getValue());
+        } catch (\net\stubbles\lang\exception\IllegalArgumentException $iae) {
+            return new AcceptHeader();
+        }
+    }
+}
+?>

src/test/php/net/stubbles/input/filter/AcceptFilterTestCase.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * This file is part of stubbles.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @package  net\stubbles\input
+ */
+namespace net\stubbles\input\filter;
+use net\stubbles\input\Param;
+/**
+ * Tests for net\stubbles\input\filter\AcceptFilter.
+ *
+ * @since  2.0.0
+ * @group  filter
+ */
+class AcceptFilterTestCase extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * apply filter on given value
+     *
+     * @param   string  $value
+     * @return  net\stubbles\peer\http\AcceptHeader
+     */
+    private function apply($value)
+    {
+        $acceptFilter = new AcceptFilter();
+        return $acceptFilter->apply(new Param('Accept', $value));
+    }
+
+    /**
+     * @test
+     */
+    public function returnsEmptyAcceptHeaderWhenParamValueIsNull()
+    {
+        $this->assertEquals(0, $this->apply(null)->count());
+    }
+
+    /**
+     * @test
+     */
+    public function returnsEmptyAcceptHeaderWhenParamValueIsEmpty()
+    {
+        $this->assertEquals(0, $this->apply('')->count());
+    }
+
+    /**
+     * @test
+     */
+    public function returnsEmptyAcceptHeaderWhenParamValueIsInvalid()
+    {
+        $this->assertEquals(0, $this->apply('text/plain;q=5')->count());
+    }
+
+    /**
+     * @test
+     */
+    public function returnsFilledAcceptHeaderWhenParamValueIsValid()
+    {
+        $this->assertEquals(1, $this->apply('text/plain;q=0.5')->count());
+    }
+}
+?>