Allow applying further filters with ChainableFilter

README.md

@@ -186,6 +186,9 @@ $matcher = new TypeMatcher('Doctrine\Common\Collections\Collection');
 - `DeepCopy\Filter` applies a transformation to the object attribute matched by `DeepCopy\Matcher`
 - `DeepCopy\TypeFilter` applies a transformation to any element matched by `DeepCopy\TypeMatcher`
 
+By design, matching a filter will stop the chain of filters (i.e. the next ones will not be applied).
+Using the ([`ChainableFilter`](#chainablefilter-filter)) won't stop the chain of filters.
+
 
 #### `SetNullFilter` (filter)
 
@@ -226,6 +229,34 @@ $copy = $copier->copy($object);
 ```
 
 
+#### `ChainableFilter` (filter)
+
+If you use cloning on proxy classes, you might want to apply two filters for:
+1. loading the data
+2. applying a transformation
+
+You can use the `ChainableFilter` as a decorator of the proxy loader filter, which won't stop the chain of filters (i.e. 
+the next ones may be applied).
+
+
+```php
+use DeepCopy\DeepCopy;
+use DeepCopy\Filter\ChainableFilter;
+use DeepCopy\Filter\Doctrine\DoctrineProxyFilter;
+use DeepCopy\Filter\SetNullFilter;
+use DeepCopy\Matcher\Doctrine\DoctrineProxyMatcher;
+use DeepCopy\Matcher\PropertyNameMatcher;
+
+$copier = new DeepCopy();
+$copier->addFilter(new ChainableFilter(new DoctrineProxyFilter()), new DoctrineProxyMatcher());
+$copier->addFilter(new SetNullFilter(), new PropertyNameMatcher('id'));
+
+$copy = $copier->copy($object);
+
+echo $copy->id; // null
+```
+
+
 #### `DoctrineCollectionFilter` (filter)
 
 If you use Doctrine and want to copy an entity, you will need to use the `DoctrineCollectionFilter`:
@@ -268,14 +299,16 @@ Doctrine proxy class (...\\\_\_CG\_\_\Proxy).
 You can use the `DoctrineProxyFilter` to load the actual entity behind the Doctrine proxy class.
 **Make sure, though, to put this as one of your very first filters in the filter chain so that the entity is loaded
 before other filters are applied!**
+We recommend to decorate the `DoctrineProxyFilter` with the `ChainableFilter` to allow applying other filters to the
+cloned lazy loaded entities.
 
 ```php
 use DeepCopy\DeepCopy;
 use DeepCopy\Filter\Doctrine\DoctrineProxyFilter;
 use DeepCopy\Matcher\Doctrine\DoctrineProxyMatcher;
 
 $copier = new DeepCopy();
-$copier->addFilter(new DoctrineProxyFilter(), new DoctrineProxyMatcher());
+$copier->addFilter(new ChainableFilter(new DoctrineProxyFilter()), new DoctrineProxyMatcher());
 
 $copy = $copier->copy($object);
 

fixtures/f013/A.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace DeepCopy\f013;
+
+use Doctrine\Persistence\Proxy;
+
+class A implements Proxy
+{
+    public $foo = 1;
+
+    /**
+     * @inheritdoc
+     */
+    public function __load()
+    {
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function __isInitialized()
+    {
+    }
+}

fixtures/f013/B.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace DeepCopy\f013;
+
+use Doctrine\Persistence\Proxy;
+
+class B implements Proxy
+{
+    private $foo;
+
+    /**
+     * @inheritdoc
+     */
+    public function __load()
+    {
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function __isInitialized()
+    {
+    }
+
+    public function getFoo()
+    {
+        return $this->foo;
+    }
+
+    public function setFoo($foo)
+    {
+        $this->foo = $foo;
+    }
+}

fixtures/f013/C.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace DeepCopy\f013;
+
+class C
+{
+    public $foo = 1;
+
+    public function __clone()
+    {
+        $this->foo = null;
+    }
+}

src/DeepCopy/DeepCopy.php

@@ -7,6 +7,7 @@
 use DateTimeInterface;
 use DateTimeZone;
 use DeepCopy\Exception\CloneException;
+use DeepCopy\Filter\ChainableFilter;
 use DeepCopy\Filter\Filter;
 use DeepCopy\Matcher\Matcher;
 use DeepCopy\Reflection\ReflectionHelper;
@@ -239,6 +240,10 @@ function ($object) {
                     }
                 );
 
+                if ($filter instanceof ChainableFilter) {
+                    continue;
+                }
+
                 // If a filter matches, we stop processing this property
                 return;
             }

src/DeepCopy/Filter/ChainableFilter.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace DeepCopy\Filter;
+
+/**
+ * Defines a decorator filter that will not stop the chain of filters.
+ */
+class ChainableFilter implements Filter
+{
+    /**
+     * @var Filter
+     */
+    protected $filter;
+
+    public function __construct(Filter $filter)
+    {
+        $this->filter = $filter;
+    }
+
+    public function apply($object, $property, $objectCopier)
+    {
+        $this->filter->apply($object, $property, $objectCopier);
+    }
+}

tests/DeepCopyTest/DeepCopyTest.php

@@ -20,8 +20,12 @@
 use DeepCopy\f009;
 use DeepCopy\f011;
 use DeepCopy\f012\Suit;
+use DeepCopy\f013;
+use DeepCopy\Filter\ChainableFilter;
+use DeepCopy\Filter\Doctrine\DoctrineProxyFilter;
 use DeepCopy\Filter\KeepFilter;
 use DeepCopy\Filter\SetNullFilter;
+use DeepCopy\Matcher\Doctrine\DoctrineProxyMatcher;
 use DeepCopy\Matcher\PropertyNameMatcher;
 use DeepCopy\Matcher\PropertyTypeMatcher;
 use DeepCopy\TypeFilter\ShallowCopyFilter;
@@ -508,6 +512,36 @@ public function test_it_keeps_enums()
         $this->assertSame($enum, $copy);
     }
 
+    /**
+     * @ticket https://github.com/myclabs/DeepCopy/issues/98
+     */
+    public function test_it_can_apply_two_filters_with_chainable_filter()
+    {
+        $object = new f013\A();
+
+        $deepCopy = new DeepCopy();
+        $deepCopy->addFilter(new ChainableFilter(new DoctrineProxyFilter()), new DoctrineProxyMatcher());
+        $deepCopy->addFilter(new SetNullFilter(), new PropertyNameMatcher('foo'));
+
+        $copy = $deepCopy->copy($object);
+
+        $this->assertNull($copy->foo);
+    }
+
+    public function test_it_can_copy_property_after_applying_doctrine_proxy_filter_with_chainable_filter()
+    {
+        $object = new f013\B();
+        $object->setFoo(new f013\C());
+
+        $deepCopy = new DeepCopy();
+        $deepCopy->addFilter(new ChainableFilter(new DoctrineProxyFilter()), new DoctrineProxyMatcher());
+
+        /** @var f013\B $copy */
+        $copy = $deepCopy->copy($object);
+
+        $this->assertNotEquals($copy->getFoo(), $object->getFoo());
+    }
+
     private function assertEqualButNotSame($expected, $val)
     {
         $this->assertEquals($expected, $val);