Add providers (#13)

* Add DateRangeProvider

* Add FiniteDateRangeProvider

* Test provider

Author: slavcodev

src/DateRangeProvider.php

@@ -0,0 +1,21 @@
+<?php
+/**
+ * This file is part of Zee Project.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @see https://github.com/zee/
+ */
+
+namespace Zee\DateRange;
+
+/**
+ * Date range provider.
+ *
+ * Interface for builders for predefined ranges.
+ */
+interface DateRangeProvider
+{
+    public function getDateRange(): DateRangeInterface;
+}

src/Providers/FiniteDateRangeProvider.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * This file is part of Zee Project.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @see https://github.com/zee/
+ */
+
+namespace Zee\DateRange\Providers;
+
+use DateTimeInterface;
+use Zee\DateRange\DateRange;
+use Zee\DateRange\DateRangeInterface;
+use Zee\DateRange\DateRangeProvider;
+
+/**
+ * Finite date range provider.
+ */
+final class FiniteDateRangeProvider implements DateRangeProvider
+{
+    /**
+     * @var DateTimeInterface
+     */
+    private $startDate;
+
+    /**
+     * @var DateTimeInterface
+     */
+    private $endDate;
+
+    /**
+     * @param DateTimeInterface $startDate
+     * @param DateTimeInterface $endDate
+     */
+    public function __construct(DateTimeInterface $startDate, DateTimeInterface $endDate)
+    {
+        $this->startDate = $startDate;
+        $this->endDate = $endDate;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDateRange(): DateRangeInterface
+    {
+        return new DateRange($this->startDate, $this->endDate);
+    }
+}

tests/DateRangeProviderTest.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * This file is part of Zee Project.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @see https://github.com/zee/
+ */
+
+namespace Zee\DateRange;
+
+use DateTimeImmutable;
+use PHPUnit\Framework\TestCase;
+use Zee\DateRange\Providers\FiniteDateRangeProvider;
+
+/**
+ * Class DateRangeProviderTest.
+ */
+final class DateRangeProviderTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function usingBuilder()
+    {
+        $yesterday = new DateTimeImmutable('-1 day');
+        $tomorrow = new DateTimeImmutable('+1 day');
+        $calculator = function (FiniteDateRangeProvider $dateRangeProvider) {
+            $range = $dateRangeProvider->getDateRange();
+            $interval = $range->getDateInterval();
+
+            return $interval->days;
+        };
+
+        $dateRangeProvider = new FiniteDateRangeProvider($yesterday, $tomorrow);
+        $result = $calculator($dateRangeProvider);
+
+        self::assertSame(2, $result);
+    }
+}

tests/DateRangeTest.php

@@ -17,7 +17,7 @@
 /**
  * Class DateRangeTest.
  */
-class DateRangeTest extends TestCase
+final class DateRangeTest extends TestCase
 {
     /**
      * @test