added DateTime formatter for Datetime class. Based on instance of cla…

…ss to be DateTime

src/transformers/DatetimeTransformer.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * Created by IntelliJ IDEA.
+ * User: Grinfeld Mikhail
+ * Date: 10/26/2016
+ * Time: 11:42 PM
+ */
+
+namespace grinfeld\phpjsonable\transformers;
+
+
+use grinfeld\phpjsonable\utils\Configuration;
+use grinfeld\phpjsonable\utils\streams\OutputStream;
+
+class DatetimeTransformer implements Transformer {
+
+    /**
+     * checks if specific object matches current Transformer, i.e. it's instance of DateTime
+     * @param $obj object to test
+     * @return bool true if if specific object matches current Transformer, i.e. it's instance of DateTime, else false
+     */
+    public function match($obj) {
+        return $obj instanceof \DateTime;
+    }
+
+    /**
+     * @param $obj object to transform
+     * @param OutputStream $output
+     * @param Configuration $conf
+     * @return void
+     */
+    public function transform($obj, OutputStream $output, Configuration $conf) {
+        if ($conf == null)
+            $conf = new Configuration();
+
+        $strategy = $conf->getString(Configuration::DATE_STRATEGY_PROPERTY, Configuration::DATE_STRATEGY_TIMESTAMP);
+
+        if ($strategy == Configuration::DATE_STRATEGY_TIMESTAMP) {
+            $res = $obj->getTimestamp();
+            $output->write("" . $res);
+        } else {
+            $format = $conf->getString(Configuration::DATE_FORMAT_PROPERTY, Configuration::DEFAULT_DATE_FORMAT);
+            $res = $obj->format($format);
+            $output->write("\"" . $res . "\"");
+        }
+    }
+}

src/transformers/TransformerFactory.php

@@ -41,6 +41,7 @@ public static function init() {
             new StringTransformer(),
             new ArrayTransformer(),
             new MapTransformer(),
+            new DatetimeTransformer(),
             new BeanTransformer()
         );
     }

src/utils/Configuration.php

@@ -9,6 +9,7 @@
 class Configuration {
 
     const CLASS_PROPERTY = "class_property";
+
     const DEFAULT_CLASS_PROPERTY_VALUE = "class";
 
     const INCLUDE_CLASS_NAME_PROPERTY = "include_class";
@@ -17,6 +18,18 @@ class Configuration {
 
     const CLASS_TYPE_PROPERTY = "classname_strategy";
 
+    const DATE_STRATEGY_PROPERTY = "date_strategy";
+
+    const DATE_STRATEGY_TIMESTAMP = "timestamp";
+
+    const DATE_STRATEGY_STRING = "string";
+
+    const DEFAULT_DATE_STRATEGY = self::DATE_STRATEGY_TIMESTAMP;
+
+    const DATE_FORMAT_PROPERTY = "date_format";
+
+    const DEFAULT_DATE_FORMAT = "Y-m-d H:i:s"; // default mysql format
+
     protected $properties = array();
 
     /**

test/parsers/json/WriterTest.php

@@ -130,6 +130,12 @@ public function testParse() {
         $output = new StringOutputStream();
         Json::encode(new SimpleBean(), $output, (new Configuration())->push(Configuration::INCLUDE_CLASS_NAME_PROPERTY, "false")->push(Configuration::EXCLUDE_NULL_PROPERTY, "false"));
         $this->assertEquals("{\"val\":\"123\"}", $output->toString(), "Should be 123");
+
+        $date = new DateTime('now');
+        $timestamp = $date->getTimestamp();
+        $output = new StringOutputStream();
+        Json::encode(array("date" => $date), $output);
+        $this->assertEquals("{\"date\":$timestamp}", $output->toString(), "Should be $timestamp");
     }
 }