rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 130 insertions, 0 deletions

diff --git a/libs/ardour/ardour/data_type.h b/libs/ardour/ardour/data_type.h
new file mode 100644
index 0000000000..854f52acba
--- /dev/null
+++ b/libs/ardour/ardour/data_type.h
@@ -0,0 +1,130 @@
+/*
+    Copyright (C) 2006 Paul Davis 
+    Author: Dave Robillard
+    
+    This program 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.
+    
+    This program 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 more 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.,
+    675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef __ardour_data_type_h__
+#define __ardour_data_type_h__
+
+#include <string>
+#include <jack/jack.h>
+
+namespace ARDOUR {
+
+
+/** A type of Data Ardour is capable of processing.
+ *
+ * The majority of this class is dedicated to conversion to and from various
+ * other type representations, simple comparison between then, etc.  This code
+ * is deliberately 'ugly' so other code doesn't have to be.
+ */
+class DataType
+{
+public:
+	/** Numeric symbol for this DataType.
+	 *
+	 * Castable to int for use as an array index (e.g. by ChanCount).
+	 * Note this means NIL is (ntypes-1) and guaranteed to change when
+	 * types are added, so this number is NOT suitable for serialization,
+	 * network, or binary anything.
+	 *
+	 * WARNING: The number of non-NIL entries here must match num_types.
+	 */
+	enum Symbol {
+		AUDIO = 0,
+		MIDI = 1,
+		NIL = 2,
+	};
+	
+	/** Number of types (not including NIL).
+	 * WARNING: make sure this matches Symbol!
+	 */
+	static const uint32_t num_types = 2;
+
+	DataType(const Symbol& symbol)
+	: _symbol(symbol)
+	{}
+
+	/** Construct from a string (Used for loading from XML and Ports)
+	 * The string can be as in an XML file (eg "audio" or "midi"), or a
+	 * Jack type string (from jack_port_type) */
+	DataType(const std::string& str)
+	: _symbol(NIL) {
+		if (str == "audio" || str == JACK_DEFAULT_AUDIO_TYPE)
+			_symbol = AUDIO;
+		else if (str == "midi" || str == JACK_DEFAULT_MIDI_TYPE)
+			_symbol = MIDI;
+	}
+
+	/** Get the Jack type this DataType corresponds to */
+	const char* to_jack_type() const {
+		switch (_symbol) {
+			case AUDIO: return JACK_DEFAULT_AUDIO_TYPE;
+			case MIDI:  return JACK_DEFAULT_MIDI_TYPE;
+			default:    return "";
+		}
+	}
+	
+	/** Inverse of the from-string constructor */
+	const char* to_string() const {
+		switch (_symbol) {
+			case AUDIO: return "audio";
+			case MIDI:  return "midi";
+			default:    return "unknown"; // reeeally shouldn't ever happen
+		}
+	}
+
+	inline operator uint32_t() const { return (uint32_t)_symbol; }
+
+	/** DataType iterator, for writing generic loops that iterate over all
+	 * available types.
+	 */
+	class iterator {
+	public:
+
+		iterator(uint32_t index) : _index(index) {}
+
+		DataType  operator*()  { return DataType((Symbol)_index); }
+		iterator& operator++() { ++_index; return *this; } // yes, prefix only
+		bool operator==(const iterator& other) { return (_index == other._index); }
+		bool operator!=(const iterator& other) { return (_index != other._index); }
+
+	private:
+		friend class DataType;
+
+		uint32_t _index;
+	};
+
+	static iterator begin() { return iterator(0); }
+	static iterator end()   { return iterator(num_types); }
+	
+	bool operator==(const Symbol symbol) { return (_symbol == symbol); }
+	bool operator!=(const Symbol symbol) { return (_symbol != symbol); }
+	
+	bool operator==(const DataType other) { return (_symbol == other._symbol); }
+	bool operator!=(const DataType other) { return (_symbol != other._symbol); }
+
+private:
+	Symbol _symbol; // could be const if not for the string constructor
+};
+
+
+
+} // namespace ARDOUR
+
+#endif // __ardour_data_type_h__
+