Changeset 34:3a90641eba91 in xplra for src

Timestamp:

02/09/13 12:29:31 (12 years ago)

Author:

István Váradi <ivaradi@…>

Branch:

default

Phase:

public

Message:

Implemented the multi-dataref getter in Python

File:

• src/client/python/xplra.py (modified) (2 diffs)

src/client/python/xplra.py

@@ -127 +127 @@
         """Determine if we are connected to the simulator."""
         return self._stream is not None
+
+    def createMultiGetter(self):
+        """Create a new multi-dataref getter for this X-Plane object."""
+        return MultiGetter(self)
 
     def getInt(self, name):
@@ -354 +358 @@
 
 #-------------------------------------------------------------------------------
+
+class MultiBuffer(object):
+    """Buffer for querying or setting multi-dataref values."""
+    @staticmethod
+    def _getDefault(type, length):
+        """Get the default value for the given type."""
+        if type==TYPE_INT:
+            return 0
+        elif type==TYPE_FLOAT:
+            return float(0.0)
+        elif type==TYPE_DOUBLE:
+            return 0.0
+        elif length<=0:
+            return []
+        elif type==TYPE_FLOAT_ARRAY:
+            return [float(0.0)] * length
+        elif type==TYPE_INT_ARRAY or type==TYPE_BYTE_ARRAY:
+            return [0] * length
+
+    def __init__(self, xplane, registerCommand, unregisterCommand):
+        """Construct the buffer for the given XPlane instance and with the
+        given register/unregister command values."""
+        self._xplane = xplane
+        self._registerCommand = registerCommand
+        self._unregisterCommand = unregisterCommand
+
+        self._dataRefs = []
+        self._values = None
+
+        self._registeredID = None
+
+    def addInt(self, name):
+        """Add an integer to the buffer with the given name
+
+        Returns an ID (or index) of the dataref."""
+        return self._add(name, TYPE_INT)
+
+    def addFloat(self, name):
+        """Add a float to the buffer with the given name
+
+        Returns an ID (or index) of the dataref."""
+        return self._add(name, TYPE_FLOAT)
+
+    def addDouble(self, name):
+        """Add a double to the buffer with the given name
+
+        Returns an ID (or index) of the dataref."""
+        return self._add(name, TYPE_DOUBLE)
+
+    def addFloatArray(self, name, length = -1, offset = 0):
+        """Add a floating point array to the buffer with the given name.
+
+        Returns an ID (or index) of the dataref."""
+        return self._add(name, TYPE_FLOAT_ARRAY, length, offset)
+
+    def addIntArray(self, name, length = -1, offset = 0):
+        """Add an integer array to the buffer with the given name.
+
+        Returns an ID (or index) of the dataref."""
+        return self._add(name, TYPE_INT_ARRAY, length, offset)
+
+    def addByteArray(self, name, length = -1, offset = 0):
+        """Add a byte array to the buffer with the given name.
+
+        Returns an ID (or index) of the dataref."""
+        return self._add(name, TYPE_BYTE_ARRAY, length, offset)
+
+    def finalize(self):
+        """Finalize the buffer, if not finalized yet.
+
+        It initializes the array of values with some defaults.
+
+        Returns whether there is any data in the buffer."""
+        if self._values is None:
+            self._values = [self._getDefault(type, length)
+                            for (_, type, length, _) in self._dataRefs]
+        return self._values!=[]
+
+    def register(self):
+        """Register the buffer in X-Plane."""
+        if self.finalize() and self._registeredID is None:
+            self._writeSpec(self._registerCommand)
+            self._registeredID = self._xplane._readU32()
+
+    def unregister(self):
+        """Unregister the buffer from X-Plane."""
+        if self._registeredID is not None:
+            self._xplane._writeU8(self._unregisterCommand)
+            self._xplane._writeU32(self._registeredID)
+            self._xplane._flush()
+            self._xplane._checkResult()
+            self._registeredID = None
+
+    def execute(self):
+        """Perform the querying or the setting of the values.
+
+        It first checks if the buffer is finalized. If not, it will be
+        finalized. However, if it is not finalized but also registered, it will
+        first be unregistered and the re-registered after finalizing."""
+        if self._values is None and self._registeredID is not None:
+            self.unregister()
+            self.register()
+        else:
+            self.finalize()
+
+        if self._registeredID is None:
+            self._executeUnregistered()
+        else:
+            self._executeRegistered()
+
+    def getString(self, id):
+        """Get the value of the dataref with the given ID as a string.
+
+        The dataref should be of type byte array."""
+        if self._dataRefs[id][1]!=TYPE_BYTE_ARRAY:
+            raise TypeError("xplra.MultiBuffer.getString: only byte arrays can be converted to strings")
+        if self._values is None:
+            self.finalize()
+        s = ""
+        for c in self._values[id]:
+            if c==0: break
+            s += chr(c)
+        return s
+
+    def _add(self, name, type, length = None, offset = None):
+        """Add a scalar to the buffer with the given name and type"""
+        index = len(self._dataRefs)
+        self._values = None
+        self._dataRefs.append( (name, type, length, offset) )
+        return index
+
+    def _writeSpec(self, command):
+        """Write the specification preceded by the given command and check for
+        the result.
+
+        The specification is basically the list of the datarefs."""
+        self._xplane._writeU8(command)
+        self._xplane._writeU32(len(self._dataRefs))
+
+        for (name, type, length, offset) in self._dataRefs:
+            self._xplane._writeString(name)
+            self._xplane._writeU8(type)
+            if length is not None and offset is not None:
+                self._xplane._writeS32(length)
+                self._xplane._writeS32(offset)
+
+        self._xplane._flush()
+        self._xplane._checkResult()
+
+    def __len__(self):
+        """Get the number of value items in the buffer."""
+        if self._values is None:
+            self.finalize()
+        return len(self._values)
+
+    def __getitem__(self, id):
+        """Get the item with the given ID."""
+        if self._values is None:
+            self.finalize()
+        return self._values[id]
+
+    def __setitem__(self, id, value):
+        """Set the item with the given ID."""
+        if self._values is None:
+            self.finalize()
+        type = self._dataRefs[id][1]
+        if type==TYPE_INT:
+            self._values[id] = int(value)
+        elif type==TYPE_FLOAT:
+            self._values[id] = float(value)
+        elif type==TYPE_DOUBLE:
+            self._values[id] = double(value)
+        elif type==TYPE_FLOAT_ARRAY:
+            self._values[id] = [float(x) for x in value]
+        elif type==TYPE_INT_ARRAY:
+            self._values[id] = [int(x) for x in value]
+        elif type==TYPE_BYTE_ARRAY:
+            if instanceof(value, str):
+                self._values[id] = [ord(x) for x in value]
+            else:
+                self._values[id] = [int(x) for x in value]
+
+    def __iter__(self):
+        """Get an iterator over the values of this buffer."""
+        if self._values is None:
+            self.finalize()
+        return iter(self._values)
+
+
+#-------------------------------------------------------------------------------
+
+class MultiGetter(MultiBuffer):
+    """Multi-dataref buffer for querying."""
+    def __init__(self, xplane):
+        """Construct the getter."""
+        super(MultiGetter, self).__init__(xplane,
+                                          COMMAND_REGISTER_GET_MULTI,
+                                          COMMAND_UNREGISTER_GET_MULTI)
+
+    def _executeRegistered(self):
+        """Execute the query if the buffer is registered."""
+        self._xplane._writeU8(COMMAND_EXECUTE_GET_MULTI)
+        self._xplane._writeU32(self._registeredID)
+        self._xplane._flush()
+
+        self._xplane._checkResult()
+
+        self._readValues()
+
+    def _executeUnregistered(self):
+        """Execute the query if the buffer is not registered."""
+        self._writeSpec(COMMAND_GET_MULTI)
+        self._readValues()
+
+    def _readValues(self):
+        """Read the values into the values array."""
+        for i in range(0, len(self._dataRefs)):
+            self._values[i] = self._xplane._readValue(self._dataRefs[i][1])
+
+#-------------------------------------------------------------------------------