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comparison SolutionFile.m @ 9:6b9b2283e7ed

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Added class for handleing .mat files as a key-value store.
author Jonatan Werpers <jonatan@werpers.com>
date Mon, 21 Sep 2015 17:41:18 +0200
parents
children 4d8068cb5c65
comparison
equal deleted inserted replaced
8:67ab7fd8054c 9:6b9b2283e7ed
1 classdef SolutionFile < handle
2 properties
3 filename
4 matfile
5 % keyHeaders
6 keys % Cell array of keys. Each key is a structure
7 % entries
8 end
9
10 methods
11 function obj = SolutionFile(filename)
12
13 obj.filename = filename;
14
15 is_new_file = ~exist(filename,'file');
16
17 obj.matfile = matfile(filename,'Writable',true);
18
19 if is_new_file
20 obj.matfile.keys = {};
21 obj.matfile.entries = {};
22 end
23
24 % obj.keyHeaders = obj.matfile.keyHeaders;
25 obj.keys = obj.matfile.keys;
26
27 end
28
29 function list(obj, show_syntax)
30 default_arg('show_syntax',false);
31 for i = 1:length(obj.keys)
32 fprintf('[%d]: %s', i, struct2string(obj.keys{i}));
33
34 if show_syntax
35 fprintf('\t%s',struct2syntax(obj.keys{i}));
36 end
37
38 fprintf('\n');
39 end
40 end
41
42 % Returns the index for a key. Returns 0 if the key doesn't exist
43 function I = getIndex(obj, key)
44 I = 0;
45
46 for i = 1:length(obj.keys)
47 if isequal(key,obj.keys{i});
48 I = i;
49 return
50 end
51 end
52 end
53
54 function b = isKey(obj, key)
55 I = obj.getIndex(key);
56
57 if I == 0
58 b = false;
59 else
60 b = true;
61 end
62 end
63
64 % Gets entries where key match exactly.
65 function e = get(obj, key)
66 if ~obj.isKey(key);
67 error('No such key: %s', struct2string(key));
68 end
69
70 I = obj.getIndex(key);
71 e = getEntryByIndex(I); % unpack the cell array
72 end
73
74
75 % Handles indexing weirdness of matfile class
76 function e = getEntryByIndex(obj, I)
77 e = obj.matfile.entries(1,I);
78 e = e{1};
79 end
80
81 function e = deleteByIndex(obj, I)
82 obj.keys(I) = [];
83 obj.matfile.keys = obj.keys;
84
85 entries = obj.matfile.entries;
86 entries(I) = [];
87 obj.matfile.entries = entries;
88 end
89
90 % Handles indexing weirdness of matfile class
91 function setEntryByIndex(obj,I, entry, force_flag)
92 default_arg('force_flag',false);
93 if ~force_flag && ( I < 1 || I > length(obj.keys))
94 error('I is out of range. I = %d',I);
95 end
96 obj.matfile.entries(1,I) = {entry};
97 end
98
99 function store(obj, key, entry)
100 if obj.isKey(key);
101 I = obj.getIndex(key);
102 else
103 I = length(obj.keys) + 1;
104 end
105
106 obj.keys{I} = key;
107 obj.matfile.keys = obj.keys;
108 obj.setEntryByIndex(I,entry,true);
109 end
110
111 function delete(obj, key)
112 if ~obj.isKey(key);
113 error('No such key: %s', struct2string(key));
114 end
115 I = obj.getIndex(key);
116 obj.deleteByIndex(I);
117 end
118
119
120
121 % Gets entries where the defined parts of partial_key matches the key of the entry
122 function [keys, entries] = find(obj,partial_key)
123 keys = {};
124 entries = {};
125 for i = 1:length(obj.keys)
126 if structIsSubset(partial_key,obj.keys{i})
127 i
128 obj.keys{i}
129 keys{end + 1} = obj.keys{i};
130 entries{end + 1} = obj.getEntryByIndex(i);
131 end
132 end
133
134
135 % Returns true if the the fields of struct a exists in A and have the same values
136 function b = structIsSubset(a,A)
137 fn = fieldnames(a);
138
139 b = true; % if a has no filds
140 for j = 1:length(fn)
141 fname = fn{j};
142 value = a.(fname);
143 if isfield(A,fname) && a.(fname) == A.(fname)
144 b = true;
145 continue;
146 else
147 b = false;
148 break;
149 end
150 end
151 end
152 end
153 end
154
155 end