/
BsonIterator.m
182 lines (171 loc) · 8.21 KB
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BsonIterator.m
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classdef BsonIterator < handle
% BsonIterator - Used to step through BSON documents
properties
h % lib.pointer handle to external data
end
methods
function i = BsonIterator(varargin)
% i = BsonIterator(bson) Create an iterator for stepping through a Bson document.
% May be passed a Bson object or another iterator that
% points to a subobject.
% i = BsonIterator(iter)
% This function is not usually called directly. It is preferable to use
% i = bson.iterator() or i = iter.subiterator().
% Internally called with no arguments to create an uninitialized iterator.
i.h = libpointer('bson_iterator_Ptr');
if nargin > 0
b = varargin{1};
if isa(b, 'Bson')
calllib('MongoMatlabDriver', 'mongo_bson_iterator_create', b.h, i.h);
else
calllib('MongoMatlabDriver', 'mongo_bson_subiterator', b.h, i.h);
end
end
end
function t = type(i)
% t = i.type() Returns the type of the field pointed to by this iterator. See BsonType.
if isempty(i.h) || isNull(i.h)
t = BsonType.EOO;
else
t = BsonType(calllib('MongoMatlabDriver', 'mongo_bson_iterator_type', i.h));
end
end
function t = next(i)
% t = i.next() Step this iterator to the first or next field of a Bson document.
% Returns the BsonType of the next field or BsonType.EOO if there are no more fields
% in the document.
% Example:
% i = b.iterator;
% while (i.next())
% display(i.value());
% end
if isempty(i.h) || isNull(i.h)
t = BsonType.EOO;
else
t = BsonType(calllib('MongoMatlabDriver', 'mongo_bson_iterator_next', i.h));
end
end
function k = key(i)
% k = i.key() Return the key (name) of the field pointed to by this iterator.
k = calllib('MongoMatlabDriver', 'mongo_bson_iterator_key', i.h);
end
function v = value(i)
% v = i.value() Returns the value of the field pointed to by this iterator.
% Multidimensional values are detected and returned as appropriate.
% The mapping from BsonTypes to Matlab types is as follows:
% EOO []
% DOUBLE double
% STRING char array
% OBJECT complex if { "r" : real, "i" : imag } is detected;
% otherwise, error.
% BINDATA [1, n] array of uint8 bytes. See binaryType().
% UNDEFINED []
% OID BsonOID
% BOOL logical
% DATE double datenum
% NULL []
% REGEX BsonRegex
% DEBREF Deprecated (not supported)
% CODE char array
% SYMBOL char array
% CODEWSCOPE BsonCodeWScope
% INT int32
% TIMESTAMP BsonTimestamp
% LONG int64
switch (i.type)
case {BsonType.EOO, BsonType.UNDEFINED, BsonType.NULL}
v = [];
case BsonType.DOUBLE
v = calllib('MongoMatlabDriver', 'mongo_bson_iterator_double', i.h);
case {BsonType.STRING, BsonType.SYMBOL}
v = calllib('MongoMatlabDriver', 'mongo_bson_iterator_string', i.h);
case BsonType.OBJECT
j = i.subiterator;
j.next;
success = strcmp(j.key, 'r') && j.type == BsonType.REAL;
if success
r = j.value;
j.next;
success = strcmp(j.key, 'i') && j.type == BsonType.REAL;
if success
v = complex(r, j.value);
success = (j.next == BsonType.EOO);
end
end
if ~success
error('BsonIterator:value', 'Iterator points to a subobject. Use subiterator().');
end
case BsonType.ARRAY
v = calllib('MongoMatlabDriver', 'mongo_bson_array_value', i.h);
case BsonType.BINDATA
s = calllib('MongoMatlabDriver', 'mongo_bson_iterator_bin_len', i.h);
v = zeros([1, s], 'uint8');
p = libpointer('uint8Ptr', v);
calllib('MongoMatlabDriver', 'mongo_bson_iterator_bin_value', i.h, p);
v = p.Value;
case BsonType.OID
v = zeros([1, 12], 'uint8');
p = libpointer('uint8Ptr', v);
calllib('MongoMatlabDriver', 'mongo_bson_iterator_oid', i.h, p);
v = BsonOID(p.Value);
case BsonType.BOOL
v = (calllib('MongoMatlabDriver', 'mongo_bson_iterator_bool', i.h) ~= 0);
case BsonType.DATE
v = 719529 + calllib('MongoMatlabDriver', 'mongo_bson_iterator_date', i.h) / (1000.0 * 60 * 60 * 24);
case BsonType.REGEX
v = BsonRegex(calllib('MongoMatlabDriver', 'mongo_bson_iterator_regex', i.h), ...
calllib('MongoMatlabDriver', 'mongo_bson_iterator_regex_opts', i.h));
case BsonType.DBREF
error('BsonIterator:value', 'No support for deprecated DBREF');
case BsonType.CODE
v = calllib('MongoMatlabDriver', 'mongo_bson_iterator_code', i.h);
case BsonType.CODEWSCOPE
scope = Bson();
calllib('MongoMatlabDriver', 'mongo_bson_iterator_code_scope', i.h, scope.h);
v = BsonCodeWScope(calllib('MongoMatlabDriver', 'mongo_bson_iterator_code', i.h), scope);
case BsonType.TIMESTAMP
inc = int32(0);
[t, dummy_ih, inc] = calllib('MongoMatlabDriver', 'mongo_bson_iterator_timestamp', i.h, inc);
v = BsonTimestamp(719529 + t / (60.0 * 60 * 24), inc);
case BsonType.INT
v = int32(calllib('MongoMatlabDriver', 'mongo_bson_iterator_int', i.h));
case BsonType.LONG
v = int64(calllib('MongoMatlabDriver', 'mongo_bson_iterator_long', i.h));
otherwise
error('BsonIterator:value', 'Unknown BSON type: %d', i.type);
end
end
function t = binaryType(i)
% t = i.binaryType() Return the subtype of a binary BSON field.
% (if this iterator points to one).
if i.type == BsonType.BINDATA
t = calllib('MongoMatlabDriver', 'mongo_bson_iterator_bin_type', i.h);
else
error('BsonIterator:binaryType', 'Expected a binary BSON field');
end
end
function si = subiterator(i)
% si = i.subiterator() Returns an iterator to a subobject or array.
si = BsonIterator(i);
end
function delete(i)
% Release this iterator.
% It is not necessary to called this function directly. Matlab will call this
% automatically when this iterator is no longer referenced.
calllib('MongoMatlabDriver', 'mongo_bson_iterator_free', i.h);
end
end
end
% Copyright 2009-2011 10gen Inc.
%
% Licensed under the Apache License, Version 2.0 (the "License");
% you may not use this file except in compliance with the License.
% You may obtain a copy of the License at
%
% http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS,
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
% See the License for the specific language governing permissions and
% limitations under the License.