dash: Group: Adding a getter for Representation by id.

This will be used to implement @dependencyId
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 058904517b00e08409aadb8e8f1579c5cc602387)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/stream_filter/dash/mpd/Group.cpp

@@ -84,6 +84,20 @@ std::vector<Representation*>    Group::getRepresentations       ()
     return this->representations;
 }
 
+const Representation *Group::getRepresentationById(const std::string &id) const
+{
+    std::vector<Representation*>::const_iterator    it = this->representations.begin();
+    std::vector<Representation*>::const_iterator    end = this->representations.end();
+
+    while ( it != end )
+    {
+        if ( (*it)->getId() == id )
+            return *it;
+        ++it;
+    }
+    return NULL;
+}
+
 void                            Group::addRepresentation        (Representation *rep)
 {
     this->representations.push_back(rep);

modules/stream_filter/dash/mpd/Group.h

@@ -50,6 +50,7 @@ namespace dash
 
                 std::string                     getSubSegmentAlignment  () throw(dash::exception::AttributeNotPresentException);
                 std::vector<Representation *>   getRepresentations      ();
+                const Representation*           getRepresentationById   ( const std::string &id ) const;
                 Viewpoint*                      getViewpoint            () throw(dash::exception::ElementNotPresentException);
                 Accessibility*                  getAccessibility        () throw(dash::exception::ElementNotPresentException);
                 Rating*                         getRating               () throw(dash::exception::ElementNotPresentException);