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 89
