Support overriding `DefaultValueBinder::dataTypeForValue()`

This allow to avoid overriding `DefaultValueBinder::bindValue()`

Fixes #735

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - SUMIFS containing multiple conditions - [#704](https://github.com/PHPOffice/PhpSpreadsheet/issues/704)
 - Csv reader avoid notice when the file is empty - [#743](https://github.com/PHPOffice/PhpSpreadsheet/pull/743)
 - Fix print area parser for XLSX reader - [#734](https://github.com/PHPOffice/PhpSpreadsheet/pull/734)
+- Support overriding `DefaultValueBinder::dataTypeForValue()` without overriding `DefaultValueBinder::bindValue()` - [#735](https://github.com/PHPOffice/PhpSpreadsheet/pull/735)
 
 ## [1.5.0] - 2018-10-21
 

src/PhpSpreadsheet/Cell/DefaultValueBinder.php

@@ -31,7 +31,7 @@ class DefaultValueBinder implements IValueBinder
         }
 
         // Set value explicit
-        $cell->setValueExplicit($value, self::dataTypeForValue($value));
+        $cell->setValueExplicit($value, static::dataTypeForValue($value));
 
         // Done!
         return true;

tests/PhpSpreadsheetTests/Cell/DefaultValueBinderTest.php

@@ -12,18 +12,20 @@ use PHPUnit\Framework\TestCase;
 
 class DefaultValueBinderTest extends TestCase
 {
-    private $cellStub;
-
     private function createCellStub()
     {
         // Create a stub for the Cell class.
-        $this->cellStub = $this->getMockBuilder(Cell::class)
+        /** @var Cell $cellStub */
+        $cellStub = $this->getMockBuilder(Cell::class)
             ->disableOriginalConstructor()
             ->getMock();
+
         // Configure the stub.
-        $this->cellStub->expects($this->any())
+        $cellStub->expects($this->any())
             ->method('setValueExplicit')
             ->will($this->returnValue(true));
+
+        return $cellStub;
     }
 
     /**
@@ -33,9 +35,9 @@ class DefaultValueBinderTest extends TestCase
      */
     public function testBindValue($value)
     {
-        $this->createCellStub();
+        $cellStub = $this->createCellStub();
         $binder = new DefaultValueBinder();
-        $result = $binder->bindValue($this->cellStub, $value);
+        $result = $binder->bindValue($cellStub, $value);
         self::assertTrue($result);
     }
 
@@ -83,4 +85,14 @@ class DefaultValueBinderTest extends TestCase
         $result = DefaultValueBinder::dataTypeForValue($objRichText);
         self::assertEquals($expectedResult, $result);
     }
+
+    public function testCanOverrideStaticMethodWithoutOverridingBindValue()
+    {
+        $cellStub = $this->createCellStub();
+        $binder = new ValueBinderWithOverriddenDataTypeForValue();
+
+        self::assertFalse($binder::$called);
+        $binder->bindValue($cellStub, 123);
+        self::assertTrue($binder::$called);
+    }
 }

tests/PhpSpreadsheetTests/Cell/ValueBinderWithOverriddenDataTypeForValue.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Cell;
+
+use PhpOffice\PhpSpreadsheet\Cell\DefaultValueBinder;
+
+class ValueBinderWithOverriddenDataTypeForValue extends DefaultValueBinder
+{
+    public static $called = false;
+
+    public static function dataTypeForValue($pValue)
+    {
+        self::$called = true;
+
+        return parent::dataTypeForValue($pValue);
+    }
+}