X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fprops%2FpropertyObject.cxx;h=7a46056080ea67b153c27d53d4628d4c2abbd8cf;hb=2acac617fcf27b49a9396e9c040c8b4b437529f1;hp=0685ae917463802481a8c7ab2f5e7769f4e469af;hpb=ac535de2fa614e7ee18b766874c937ddc6476af6;p=simgear.git

diff --git a/simgear/props/propertyObject.cxx b/simgear/props/propertyObject.cxx
index 0685ae91..7a460560 100644
--- a/simgear/props/propertyObject.cxx
+++ b/simgear/props/propertyObject.cxx
@@ -21,6 +21,8 @@
 
 #include "propertyObject.hxx"
 
+#include <simgear/structure/exception.hxx>
+
 namespace simgear
 {
 
@@ -30,9 +32,15 @@ void PropertyObjectBase::setDefaultRoot(SGPropertyNode* aRoot)
 {
   static_defaultRoot = aRoot;
 }
+  
+PropertyObjectBase::PropertyObjectBase() :
+  _path(NULL),
+  _prop(NULL)
+{
+    
+}
 
 PropertyObjectBase::PropertyObjectBase(const PropertyObjectBase& aOther) :
-  _base(aOther._base),
   _path(aOther._path),
   _prop(aOther._prop)
 {
@@ -40,32 +48,57 @@ PropertyObjectBase::PropertyObjectBase(const PropertyObjectBase& aOther) :
 }
 
 PropertyObjectBase::PropertyObjectBase(const char* aChild) :
-  _base(NULL),
   _path(aChild),
   _prop(NULL)
 {
 }
   
 PropertyObjectBase::PropertyObjectBase(SGPropertyNode* aNode, const char* aChild) :
-  _base(aNode),
   _path(aChild),
-  _prop(NULL)
+  _prop(aNode)
 {
 
 }
   
 SGPropertyNode* PropertyObjectBase::node(bool aCreate) const
 {
-  if (_prop) {
+  if (_path == NULL) { // already resolved
     return _prop;
   }
   
-  _prop = _base ? _base : static_defaultRoot;
-  if (_path) {
-    _prop = _prop->getNode(_path, aCreate);
-  }
+  SGPropertyNode *r = _prop ? _prop : static_defaultRoot,
+                 *prop = r->getNode(_path, aCreate);
   
-  return _prop;
+  if( prop )
+  {
+    // resolve worked, we will cache from now on, so clear _path and cache prop
+    _path = NULL;
+    _prop = prop;
+  }
+
+  return prop;
+}
+
+SGPropertyNode* PropertyObjectBase::getOrThrow() const
+{
+  SGPropertyNode* n = node(false);
+  if (!n) {
+    std::string path;
+    if (_prop) {
+      path = _prop->getPath();
+      if (_path) {
+        path += '/';      
+      }
+    }
+
+    if (_path) {
+      path += _path;
+    }
+
+    throw sg_exception("Unknown property:" + path);
+  }
+
+  return n;
 }
 
 } // of namespace simgear