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%
% Copyright (c) ZeroC, Inc. All rights reserved.
%
classdef EncapsDecoder10 < IceInternal.EncapsDecoder
methods
function obj = EncapsDecoder10(is, encaps, sliceValues, valueFactoryManager, classResolver, classGraphDepthMax)
obj = obj@IceInternal.EncapsDecoder(is, encaps, sliceValues, valueFactoryManager, classResolver, ...
classGraphDepthMax);
obj.sliceType = IceInternal.SliceType.NoSlice;
end
function readPendingValues(obj)
num = obj.is.readSize();
while num > 0
for k = 1:num
obj.readInstance();
end
num = obj.is.readSize();
end
if obj.patchMapLength > 0
%
% If any entries remain in the patch map, the sender has sent an index for an object, but failed
% to supply the object.
%
throw(Ice.MarshalException('', '', 'index for class received, but no instance'));
end
end
function readValue(obj, cb)
%assert(~isempty(cb));
%
% Object references are encoded as a negative integer in 1.0.
%
index = obj.is.readInt();
if index > 0
throw(Ice.MarshalException('', '', 'invalid object id'));
end
index = -index;
if index == 0
cb([]);
else
obj.addPatchEntry(index, cb);
end
end
function throwException(obj)
%assert(obj.sliceType == IceInternal.SliceType.NoSlice);
%
% User exception with the 1.0 encoding start with a boolean flag
% that indicates whether or not the exception has classes.
%
% This allows reading the pending values even if some part of
% the exception was sliced.
%
usesClasses = obj.is.readBool();
obj.sliceType = IceInternal.SliceType.ExceptionSlice;
obj.skipFirstSlice = false;
%
% Read the first slice header.
%
obj.startSlice();
mostDerivedId = obj.typeId;
while true
%
% Use the class resolver to convert the type ID into a constructor.
%
constructor = obj.classResolver.resolve(obj.typeId);
%
% Try to instantiate the class.
%
ex = [];
if ~isempty(constructor)
try
ex = constructor(); % Invoke the constructor.
catch e
%
% Instantiation failed.
%
reason = sprintf('exception in constructor for %s', obj.typeId);
me = Ice.MarshalException('', reason, reason);
me.addCause(e);
throw(me);
end
end
if ~isempty(ex)
%
% Exceptions are value types so we have to replace 'ex' with its new value after calling methods.
%
ex = ex.iceRead(obj.is);
if usesClasses
obj.readPendingValues();
end
ex = ex.icePostUnmarshal();
throw(ex);
else
%
% Slice off what we don't understand.
%
obj.skipSlice();
try
obj.startSlice();
catch ex
if isa(ex, 'Ice.UnmarshalOutOfBoundsException')
%
% An oversight in the 1.0 encoding means there is no marker to indicate
% the last slice of an exception. As a result, we just try to read the
% next type ID, which raises UnmarshalOutOfBoundsException when the
% input buffer underflows.
%
% Set the reason member to a more helpful message.
%
ex.reason = ['unknown exception type `', mostDerivedId, ''''];
end
rethrow(ex);
end
end
end
end
function startInstance(obj, sliceType)
%assert(obj.sliceType == sliceType);
obj.skipFirstSlice = true;
end
function r = endInstance(obj, ~)
%
% Read the Ice::Value slice.
%
if obj.sliceType == IceInternal.SliceType.ValueSlice
obj.startSlice();
sz = obj.is.readSize(); % For compatibility with the old AFM.
if sz ~= 0
throw(Ice.MarshalException('', '', 'invalid Object slice'));
end
obj.endSlice();
end
obj.sliceType = IceInternal.SliceType.NoSlice;
r = [];
end
function r = startSlice(obj)
%
% If first slice, don't read the header, it was already read in
% readInstance or throwException to find the type.
%
if obj.skipFirstSlice
obj.skipFirstSlice = false;
r = obj.typeId;
return;
end
%
% For values, first read the type ID boolean which indicates
% whether or not the type ID is encoded as a string or as an
% index. For exceptions, the type ID is always encoded as a
% string.
%
if obj.sliceType == IceInternal.SliceType.ValueSlice
if obj.is.readBool()
typeIdIndex = obj.is.readSize();
obj.typeIdIndex = typeIdIndex;
obj.typeId = obj.getTypeId(obj.typeIdIndex);
else
[obj.typeIdIndex, obj.typeId] = obj.readTypeId();
end
else
obj.typeId = obj.is.readString();
end
obj.sliceSize = obj.is.readInt();
if obj.sliceSize < 4
throw(Ice.UnmarshalOutOfBoundsException());
end
r = obj.typeId;
end
function endSlice(~)
% Nothing to do
end
function skipSlice(obj)
%obj.is.traceSkipSlice(obj.typeId, obj.sliceType);
%assert(obj.sliceSize >= 4);
obj.is.skip(obj.sliceSize - 4);
end
end
methods(Access=private)
function readInstance(obj)
index = obj.is.readInt();
if index <= 0
throw(Ice.MarshalException('', '', 'invalid object id'));
end
obj.sliceType = IceInternal.SliceType.ValueSlice;
obj.skipFirstSlice = false;
%
% Read the first slice header.
%
obj.startSlice();
mostDerivedId = obj.typeId;
v = [];
while true
%
% For the 1.0 encoding, the type ID for the base Object class
% marks the last slice.
%
if strcmp(obj.typeId, Ice.Value.ice_staticId())
throw(Ice.NoValueFactoryException('', '', '', mostDerivedId));
end
v = obj.newInstance(obj.typeIdIndex, obj.typeId);
%
% We found a factory, we get out of this loop.
%
if ~isempty(v)
break;
end
%
% If slicing is disabled, stop unmarshaling.
%
if ~obj.sliceValues
reason = 'no value factory found and slicing is disabled';
throw(Ice.NoValueFactoryException('', reason, reason, obj.typeId));
end
%
% Slice off what we don't understand.
%
obj.skipSlice();
obj.startSlice(); % Read next Slice header for next iteration.
end
%
% Compute the biggest class graph depth of this object. To compute this,
% we get the class graph depth of each ancestor from the patch map and
% keep the biggest one.
%
obj.classGraphDepth = 0;
if index <= length(obj.patchMap)
pl = obj.patchMap{index};
for i = 1:length(pl)
entry = pl{i};
classGraphDepth = entry.classGraphDepth;
if classGraphDepth > obj.classGraphDepth
obj.classGraphDepth = classGraphDepth;
end
end
end
obj.classGraphDepth = obj.classGraphDepth + 1;
if obj.classGraphDepth > obj.classGraphDepthMax
throw(Ice.MarshalException('', '', 'maximum class graph depth reached'));
end
%
% Unmarshal the instance and add it to the map of unmarshaled instances.
%
obj.unmarshal(index, v);
end
end
properties(Access=private)
sliceType
skipFirstSlice
sliceSize
typeId
typeIdIndex
end
end
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