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+/* This file is part of Om. Copyright (C) 2006 Dave Robillard.
+ *
+ * Om is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * Om is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef OMOBJECT_H
+#define OMOBJECT_H
+
+#include <string>
+#include <map>
+#include <cstddef>
+#include <cassert>
+#include "MaidObject.h"
+#include "util/Path.h"
+#include "types.h"
+using std::string; using std::map;
+
+namespace Om {
+
+class Patch;
+class Node;
+class Port;
+
+
+/** An object on the audio graph - Patch, Node, Port, etc.
+ *
+ * Each of these is a MaidObject and so can be deleted in a realtime safe
+ * way from anywhere, and they all have a map of metadata for clients to store
+ * arbitrary values in (which the engine puts no significance to whatsoever).
+ *
+ * \ingroup engine
+ */
+class GraphObject : public MaidObject
+{
+public:
+ GraphObject(GraphObject* parent, const string& name)
+ : _parent(parent), _name(name)
+ {
+ assert(parent == NULL || _name.length() > 0);
+ assert(parent == NULL || _name.find("/") == string::npos);
+ assert(((string)path()).find("//") == string::npos);
+ }
+
+ virtual ~GraphObject() {}
+
+ inline GraphObject* parent() const { return _parent; }
+ inline const string& name() const { return _name; }
+
+ virtual void process(samplecount nframes) = 0;
+
+ /** Rename */
+ virtual void set_path(const Path& new_path) {
+ assert(new_path.parent() == path().parent());
+ _name = new_path.name();
+ assert(_name.find("/") == string::npos);
+ }
+
+ void set_metadata(const string& key, const string& value)
+ { _metadata[key] = value; }
+
+ const string& get_metadata(const string& key) {
+ static const string empty_string = "";
+ map<string, string>::iterator i = _metadata.find(key);
+ return (i != _metadata.end()) ? (*i).second : empty_string;
+ }
+
+ const map<string, string>& metadata() const { return _metadata; }
+
+
+ /** Patch and Node override this to recursively add their children. */
+ virtual void add_to_store() = 0;
+
+ /** Patch and Node override this to recursively remove their children. */
+ virtual void remove_from_store() = 0;
+
+ /** Path is dynamically generated from parent to ease renaming */
+ inline const Path path() const {
+ if (_parent == NULL)
+ return Path(string("/").append(_name));
+ else if (_parent->path() == "/")
+ return Path(string("/").append(_name));
+ else
+ return Path(_parent->path() +"/"+ _name);
+ }
+
+protected:
+ GraphObject* _parent;
+ string _name;
+
+private:
+ // Prevent copies (undefined)
+ GraphObject(const GraphObject&);
+ GraphObject& operator=(const GraphObject& copy);
+
+ map<string, string> _metadata;
+};
+
+
+} // namespace Om
+
+#endif // OMOBJECT_H