From d4df1c1c6531405ac8881d4f728a7773b9c09198 Mon Sep 17 00:00:00 2001
From: Giorgio Sironi <piccoloprincipeazzurro@gmail.com>
Date: Mon, 13 Feb 2012 14:23:23 +0100
Subject: [PATCH] Made superclass and original variability method abstract

---
 ExtractHierarchy.php | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/ExtractHierarchy.php b/ExtractHierarchy.php
index 80d18e4..c8694ba 100644
--- a/ExtractHierarchy.php
+++ b/ExtractHierarchy.php
@@ -14,7 +14,7 @@ public function testATopicInEvidenceDisplaysItselfAsStronger()
     }
 }
 
-class Topic
+abstract class Topic
 {
     protected $title;
     protected $inEvidence;
@@ -42,14 +42,10 @@ public function title()
         return $title;
     }
 
-    protected function decoratedTitleText()
-    {
-        if ($this->inEvidence) {
-            return "<strong>$this->title</strong>";
-        } else {
-            return $this->title;
-        }
-    }
+    /**
+     * @return string
+     */
+    abstract protected function decoratedTitleText();
 }
 
 class OrdinaryTopic extends Topic