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1 /* | |
2 * Copyright 2012 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #ifndef SkDataSet_DEFINED | |
9 #define SkDataSet_DEFINED | |
10 | |
11 #include "SkData.h" | |
12 #include "SkFlattenable.h" | |
13 | |
14 class SkStream; | |
15 class SkWStream; | |
16 | |
17 class SkDataSet : public SkFlattenable { | |
18 public: | |
19 /** | |
20 * Returns a new empty dataset. Note: since SkDataSet is immutable, this | |
21 * "new" set may be the same one that was returned before, but each | |
22 * returned object must have its reference-count balanced regardless. | |
23 * | |
24 * SkDataSet* empty = SkDataSet::NewEmpty(); | |
25 * ... | |
26 * empty->unref(); | |
27 */ | |
28 static SkDataSet* NewEmpty(); | |
29 | |
30 struct Pair { | |
31 const char* fKey; | |
32 SkData* fValue; | |
33 }; | |
34 | |
35 SkDataSet(const char key[], SkData* value); | |
36 SkDataSet(const Pair[], int count); | |
37 virtual ~SkDataSet(); | |
38 | |
39 bool isEmpty() const { return 0 == fCount; } | |
40 int count() const { return fCount; } | |
41 SkData* find(const char name[]) const; | |
42 | |
43 class Iter { | |
44 public: | |
45 Iter(const SkDataSet& ds) { | |
46 fPair = ds.fPairs; | |
47 fStop = ds.fPairs + ds.fCount; | |
48 } | |
49 | |
50 const char* key() const { | |
51 SkASSERT(!this->done()); | |
52 return fPair->fKey; | |
53 } | |
54 | |
55 SkData* value() const { | |
56 SkASSERT(!this->done()); | |
57 return fPair->fValue; | |
58 } | |
59 | |
60 bool done() const { return fPair >= fStop; } | |
61 void next() { | |
62 SkASSERT(!this->done()); | |
63 fPair += 1; | |
64 } | |
65 | |
66 private: | |
67 const SkDataSet::Pair* fPair; | |
68 const SkDataSet::Pair* fStop; | |
69 }; | |
70 | |
71 explicit SkDataSet(SkStream*); | |
72 void writeToStream(SkWStream*) const; | |
73 | |
74 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDataSet) | |
75 | |
76 protected: | |
77 SkDataSet(SkFlattenableReadBuffer&); | |
78 virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; | |
79 | |
80 private: | |
81 int32_t fCount; | |
82 uint32_t fKeySize; | |
83 Pair* fPairs; | |
84 | |
85 typedef SkFlattenable INHERITED; | |
86 }; | |
87 | |
88 #endif | |
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