+private:
+ C &_obj;
+ int _index;
+ getter_t _getter;
+ setter_t _setter;
+};
+
+
+\f
+/**
+ * A node in a property tree.
+ */
+class SGPropertyNode
+{
+
+public:
+
+
+ /**
+ * Property value types.
+ */
+ enum Type {
+ NONE,
+ ALIAS,
+ BOOL,
+ INT,
+ LONG,
+ FLOAT,
+ DOUBLE,
+ STRING,
+ UNSPECIFIED
+ };
+
+
+ /**
+ * Access mode attributes.
+ *
+ * <p>The ARCHIVE attribute is strictly advisory, and controls
+ * whether the property should normally be saved and restored.</p>
+ */
+ enum Attribute {
+ READ = 1,
+ WRITE = 2,
+ ARCHIVE = 4,
+ TRACE_READ = 8,
+ TRACE_WRITE = 16
+ };
+
+
+ /**
+ * Default constructor.
+ */
+ SGPropertyNode ();
+
+
+ /**
+ * Copy constructor.
+ */
+ SGPropertyNode (const SGPropertyNode &node);
+
+
+ /**
+ * Destructor.
+ */
+ virtual ~SGPropertyNode ();
+
+
+
+ //
+ // Basic properties.
+ //
+
+ /**
+ * Test whether this node contains a primitive leaf value.
+ */
+ bool hasValue () const { return (_type != NONE); }
+
+
+ /**
+ * Get the node's simple (XML) name.
+ */
+ const string &getName () const { return _name; }
+
+
+ /**
+ * Get the node's integer index.
+ */
+ const int getIndex () const { return _index; }
+
+
+ /**
+ * Get a non-const pointer to the node's parent.
+ */
+ SGPropertyNode * getParent () { return _parent; }
+
+
+ /**
+ * Get a const pointer to the node's parent.
+ */
+ const SGPropertyNode * getParent () const { return _parent; }
+
+
+ //
+ // Children.
+ //
+
+
+ /**
+ * Get the number of child nodes.
+ */
+ const int nChildren () const { return _children.size(); }
+
+
+ /**
+ * Get a child node by position (*NOT* index).
+ */
+ SGPropertyNode * getChild (int position);
+
+
+ /**
+ * Get a const child node by position (*NOT* index).
+ */
+ const SGPropertyNode * getChild (int position) const;
+
+
+ /**
+ * Get a child node by name and index.
+ */
+ SGPropertyNode * getChild (const string &name, int index = 0,
+ bool create = false);
+
+
+ /**
+ * Get a const child node by name and index.
+ */
+ const SGPropertyNode * getChild (const string &name, int index = 0) const;
+
+
+ /**
+ * Get a vector of all children with the specified name.
+ */
+ vector<SGPropertyNode *> getChildren (const string &name);
+
+
+ /**
+ * Get a vector all all children (const) with the specified name.
+ */
+ vector<const SGPropertyNode *> getChildren (const string &name) const;
+
+
+ //
+ // Alias support.
+ //
+
+
+ /**
+ * Alias this node's leaf value to another's.
+ */
+ bool alias (SGPropertyNode * target);
+
+
+ /**
+ * Alias this node's leaf value to another's by relative path.
+ */
+ bool alias (const string &path);
+
+
+ /**
+ * Remove any alias for this node.
+ */
+ bool unalias ();
+
+
+ /**
+ * Test whether the node's leaf value is aliased to another's.
+ */
+ bool isAlias () const { return (_type == ALIAS); }
+
+
+ /**
+ * Get a non-const pointer to the current alias target, if any.
+ */
+ SGPropertyNode * getAliasTarget ();
+
+
+ /**
+ * Get a const pointer to the current alias target, if any.
+ */
+ const SGPropertyNode * getAliasTarget () const;
+
+
+ //
+ // Path information.
+ //
+
+
+ /**
+ * Get the path to this node from the root.
+ */
+ string getPath (bool simplify = false) const;
+
+
+ /**
+ * Get a pointer to the root node.
+ */
+ SGPropertyNode * getRootNode ();
+
+
+ /**
+ * Get a const pointer to the root node.
+ */
+ const SGPropertyNode * getRootNode () const;
+
+
+ /**
+ * Get a pointer to another node by relative path.
+ */
+ SGPropertyNode * getNode (const string &relative_path, bool create = false);
+
+
+ /**
+ * Get a const pointer to another node by relative path.
+ */
+ const SGPropertyNode * getNode (const string &relative_path) const;
+
+
+ //
+ // Access Mode.
+ //
+
+ /**
+ * Check a single mode attribute for the property node.
+ */
+ bool getAttribute (Attribute attr) const { return ((_attr & attr) != 0); }
+
+
+ /**
+ * Set a single mode attribute for the property node.
+ */
+ void setAttribute (Attribute attr, bool state) {
+ (state ? _attr |= attr : _attr &= ~attr);
+ }
+
+
+ /**
+ * Get all of the mode attributes for the property node.
+ */
+ int getAttributes () const { return _attr; }
+
+
+ /**
+ * Set all of the mode attributes for the property node.
+ */
+ void setAttributes (int attr) { _attr = attr; }
+
+
+ //
+ // Leaf Value (primitive).
+ //
+
+
+ /**
+ * Get the type of leaf value, if any, for this node.
+ */
+ Type getType () const;
+
+
+ /**
+ * Get a bool value for this node.
+ */
+ bool getBoolValue () const;
+
+
+ /**
+ * Get an int value for this node.
+ */
+ int getIntValue () const;
+
+
+ /**
+ * Get a long int value for this node.
+ */
+ long getLongValue () const;
+
+
+ /**
+ * Get a float value for this node.
+ */
+ float getFloatValue () const;
+
+
+ /**
+ * Get a double value for this node.
+ */
+ double getDoubleValue () const;
+
+
+ /**
+ * Get a string value for this node.
+ */
+ string getStringValue () const;
+
+
+
+ /**
+ * Set a bool value for this node.
+ */
+ bool setBoolValue (bool value);
+
+
+ /**
+ * Set an int value for this node.
+ */
+ bool setIntValue (int value);
+
+
+ /**
+ * Set a long int value for this node.
+ */
+ bool setLongValue (long value);
+
+
+ /**
+ * Set a float value for this node.
+ */
+ bool setFloatValue (float value);
+
+
+ /**
+ * Set a double value for this node.
+ */
+ bool setDoubleValue (double value);
+
+
+ /**
+ * Set a string value for this node.
+ */
+ bool setStringValue (string value);
+
+
+ /**
+ * Set a value of unspecified type for this node.
+ */
+ bool setUnspecifiedValue (string value);
+
+
+ //
+ // Data binding.
+ //
+
+
+ /**
+ * Test whether this node is bound to an external data source.
+ */
+ bool isTied () const { return _tied; }
+
+
+ /**
+ * Bind this node to an external bool source.
+ */
+ bool tie (const SGRawValue<bool> &rawValue, bool useDefault = true);
+
+
+ /**
+ * Bind this node to an external int source.
+ */
+ bool tie (const SGRawValue<int> &rawValue, bool useDefault = true);
+
+
+ /**
+ * Bind this node to an external long int source.
+ */
+ bool tie (const SGRawValue<long> &rawValue, bool useDefault = true);
+
+
+ /**
+ * Bind this node to an external float source.
+ */
+ bool tie (const SGRawValue<float> &rawValue, bool useDefault = true);
+
+
+ /**
+ * Bind this node to an external double source.
+ */
+ bool tie (const SGRawValue<double> &rawValue, bool useDefault = true);
+
+
+ /**
+ * Bind this node to an external string source.
+ */
+ bool tie (const SGRawValue<string> &rawValue, bool useDefault = true);
+
+
+ /**
+ * Unbind this node from any external data source.
+ */
+ bool untie ();
+
+
+ //
+ // Convenience methods using paths.
+ // TODO: add attribute methods
+ //
+
+
+ /**
+ * Get another node's type.
+ */
+ Type getType (const string &relative_path) const;
+
+
+ /**
+ * Test whether another node has a leaf value.
+ */
+ bool hasValue (const string &relative_path) const;
+
+
+ /**
+ * Get another node's value as a bool.
+ */
+ bool getBoolValue (const string &relative_path,
+ bool defaultValue = false) const;
+
+
+ /**
+ * Get another node's value as an int.
+ */
+ int getIntValue (const string &relative_path,
+ int defaultValue = 0) const;
+
+
+ /**
+ * Get another node's value as a long int.
+ */
+ long getLongValue (const string &relative_path,
+ long defaultValue = 0L) const;
+
+
+ /**
+ * Get another node's value as a float.
+ */
+ float getFloatValue (const string &relative_path,
+ float defaultValue = 0.0) const;
+
+
+ /**
+ * Get another node's value as a double.
+ */
+ double getDoubleValue (const string &relative_path,
+ double defaultValue = 0.0L) const;
+
+
+ /**
+ * Get another node's value as a string.
+ */
+ string getStringValue (const string &relative_path,
+ string defaultValue = "") const;
+
+
+ /**
+ * Set another node's value as a bool.
+ */
+ bool setBoolValue (const string &relative_path, bool value);
+
+
+ /**
+ * Set another node's value as an int.
+ */
+ bool setIntValue (const string &relative_path, int value);
+
+
+ /**
+ * Set another node's value as a long int.
+ */
+ bool setLongValue (const string &relative_path, long value);
+
+
+ /**
+ * Set another node's value as a float.
+ */
+ bool setFloatValue (const string &relative_path, float value);
+
+
+ /**
+ * Set another node's value as a double.
+ */
+ bool setDoubleValue (const string &relative_path, double value);
+
+
+ /**
+ * Set another node's value as a string.
+ */
+ bool setStringValue (const string &relative_path, string value);
+
+
+ /**
+ * Set another node's value with no specified type.
+ */
+ bool setUnspecifiedValue (const string &relative_path, string value);
+
+
+ /**
+ * Test whether another node is bound to an external data source.
+ */
+ bool isTied (const string &relative_path) const;
+
+
+ /**
+ * Bind another node to an external bool source.
+ */
+ bool tie (const string &relative_path, const SGRawValue<bool> &rawValue,
+ bool useDefault = true);
+
+
+ /**
+ * Bind another node to an external int source.
+ */
+ bool tie (const string &relative_path, const SGRawValue<int> &rawValue,
+ bool useDefault = true);
+
+
+ /**
+ * Bind another node to an external long int source.
+ */
+ bool tie (const string &relative_path, const SGRawValue<long> &rawValue,
+ bool useDefault = true);
+
+
+ /**
+ * Bind another node to an external float source.
+ */
+ bool tie (const string &relative_path, const SGRawValue<float> &rawValue,
+ bool useDefault = true);
+
+
+ /**
+ * Bind another node to an external double source.
+ */
+ bool tie (const string &relative_path, const SGRawValue<double> &rawValue,
+ bool useDefault = true);
+
+
+ /**
+ * Bind another node to an external string source.
+ */
+ bool tie (const string &relative_path, const SGRawValue<string> &rawValue,
+ bool useDefault = true);
+
+
+ /**
+ * Unbind another node from any external data source.
+ */
+ bool untie (const string &relative_path);
+
+
+protected:
+
+
+ /**
+ * Protected constructor for making new nodes on demand.
+ */
+ SGPropertyNode (const string &name, int index, SGPropertyNode * parent);