Go to the documentation of this file.00001 #ifndef _framing_FieldValue_h
00002 #define _framing_FieldValue_h
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00024 #include "qpid/Exception.h"
00025 #include "qpid/framing/amqp_types.h"
00026 #include "qpid/framing/Buffer.h"
00027 #include "qpid/framing/FieldTable.h"
00028 #include "qpid/CommonImportExport.h"
00029
00030 #include <iostream>
00031 #include <memory>
00032 #include <vector>
00033
00034 #include <assert.h>
00035
00036 namespace qpid {
00037 namespace framing {
00038
00044 class QPID_COMMON_CLASS_EXTERN FieldValueException : public qpid::Exception {};
00045
00051 struct QPID_COMMON_CLASS_EXTERN InvalidConversionException : public FieldValueException {
00052 InvalidConversionException() {}
00053 };
00054
00055 class List;
00056
00062 class QPID_COMMON_CLASS_EXTERN FieldValue {
00063 public:
00064
00065
00066
00067 class Data {
00068 public:
00069 virtual ~Data() {};
00070 virtual uint32_t encodedSize() const = 0;
00071 virtual void encode(Buffer& buffer) = 0;
00072 virtual void decode(Buffer& buffer) = 0;
00073 virtual bool operator==(const Data&) const = 0;
00074
00075 virtual bool convertsToInt() const { return false; }
00076 virtual bool convertsToString() const { return false; }
00077 virtual int64_t getInt() const { throw InvalidConversionException();}
00078 virtual std::string getString() const { throw InvalidConversionException(); }
00079
00080 virtual void print(std::ostream& out) const = 0;
00081 };
00082
00083 FieldValue(): data(0) {};
00084
00085 void setType(uint8_t type);
00086 QPID_COMMON_EXTERN uint8_t getType() const;
00087 Data& getData() { return *data; }
00088 uint32_t encodedSize() const { return 1 + data->encodedSize(); };
00089 bool empty() const { return data.get() == 0; }
00090 void encode(Buffer& buffer);
00091 void decode(Buffer& buffer);
00092 QPID_COMMON_EXTERN bool operator==(const FieldValue&) const;
00093 QPID_COMMON_INLINE_EXTERN bool operator!=(const FieldValue& v) const { return !(*this == v); }
00094
00095 QPID_COMMON_EXTERN void print(std::ostream& out) const;
00096
00097 template <typename T> bool convertsTo() const { return false; }
00098 template <typename T> T get() const { throw InvalidConversionException(); }
00099
00100 template <class T, int W> T getIntegerValue() const;
00101 template <class T> T getIntegerValue() const;
00102 template <class T, int W> T getFloatingPointValue() const;
00103 template <int W> void getFixedWidthValue(unsigned char*) const;
00104 template <class T> bool get(T&) const;
00105
00106 protected:
00107 FieldValue(uint8_t t, Data* d): typeOctet(t), data(d) {}
00108
00109 QPID_COMMON_EXTERN static uint8_t* convertIfRequired(uint8_t* const octets, int width);
00110
00111 private:
00112 uint8_t typeOctet;
00113 std::auto_ptr<Data> data;
00114
00115 };
00116
00117 template <>
00118 inline bool FieldValue::convertsTo<int>() const { return data->convertsToInt(); }
00119
00120 template <>
00121 inline bool FieldValue::convertsTo<int64_t>() const { return data->convertsToInt(); }
00122
00123 template <>
00124 inline bool FieldValue::convertsTo<std::string>() const { return data->convertsToString(); }
00125
00126 template <>
00127 inline int FieldValue::get<int>() const { return static_cast<int>(data->getInt()); }
00128
00129 template <>
00130 inline int64_t FieldValue::get<int64_t>() const { return data->getInt(); }
00131
00132 template <>
00133 inline std::string FieldValue::get<std::string>() const { return data->getString(); }
00134
00135 inline std::ostream& operator<<(std::ostream& out, const FieldValue& v) {
00136 v.print(out);
00137 return out;
00138 }
00139
00140 template <int width>
00141 class FixedWidthValue : public FieldValue::Data {
00142 uint8_t octets[width];
00143
00144 public:
00145 FixedWidthValue() {}
00146 FixedWidthValue(const uint8_t (&data)[width]) : octets(data) {}
00147 FixedWidthValue(const uint8_t* const data)
00148 {
00149 for (int i = 0; i < width; i++) octets[i] = data[i];
00150 }
00151 FixedWidthValue(uint64_t v)
00152 {
00153 for (int i = width; i > 1; --i) {
00154 octets[i-1] = (uint8_t) (0xFF & v); v >>= 8;
00155 }
00156 octets[0] = (uint8_t) (0xFF & v);
00157 }
00158 uint32_t encodedSize() const { return width; }
00159 void encode(Buffer& buffer) { buffer.putRawData(octets, width); }
00160 void decode(Buffer& buffer) { buffer.getRawData(octets, width); }
00161 bool operator==(const Data& d) const {
00162 const FixedWidthValue<width>* rhs = dynamic_cast< const FixedWidthValue<width>* >(&d);
00163 if (rhs == 0) return false;
00164 else return std::equal(&octets[0], &octets[width], &rhs->octets[0]);
00165 }
00166
00167 bool convertsToInt() const { return true; }
00168 int64_t getInt() const
00169 {
00170 int64_t v = 0;
00171 for (int i = 0; i < width-1; ++i) {
00172 v |= octets[i]; v <<= 8;
00173 }
00174 v |= octets[width-1];
00175 return v;
00176 }
00177 uint8_t* rawOctets() { return octets; }
00178 uint8_t* rawOctets() const { return octets; }
00179
00180 void print(std::ostream& o) const { o << "F" << width << ":"; };
00181 };
00182
00183 template <class T, int W>
00184 inline T FieldValue::getIntegerValue() const
00185 {
00186 FixedWidthValue<W>* const fwv = dynamic_cast< FixedWidthValue<W>* const>(data.get());
00187 if (fwv) {
00188 uint8_t* octets = fwv->rawOctets();
00189 T v = 0;
00190 for (int i = 0; i < W-1; ++i) {
00191 v |= octets[i]; v <<= 8;
00192 }
00193 v |= octets[W-1];
00194 return v;
00195 } else {
00196 throw InvalidConversionException();
00197 }
00198 }
00199
00200 template <class T>
00201 inline T FieldValue::getIntegerValue() const
00202 {
00203 FixedWidthValue<1>* const fwv = dynamic_cast< FixedWidthValue<1>* const>(data.get());
00204 if (fwv) {
00205 uint8_t* octets = fwv->rawOctets();
00206 return octets[0];
00207 } else {
00208 throw InvalidConversionException();
00209 }
00210 }
00211
00212 template <class T, int W>
00213 inline T FieldValue::getFloatingPointValue() const {
00214 FixedWidthValue<W>* const fwv = dynamic_cast< FixedWidthValue<W>* const>(data.get());
00215 if (fwv) {
00216 T value;
00217 uint8_t* const octets = convertIfRequired(fwv->rawOctets(), W);
00218 uint8_t* const target = reinterpret_cast<uint8_t*>(&value);
00219 for (size_t i = 0; i < W; ++i) target[i] = octets[i];
00220 return value;
00221 } else {
00222 throw InvalidConversionException();
00223 }
00224 }
00225
00226 template <int W> void FieldValue::getFixedWidthValue(unsigned char* value) const
00227 {
00228 FixedWidthValue<W>* const fwv = dynamic_cast< FixedWidthValue<W>* const>(data.get());
00229 if (fwv) {
00230 for (size_t i = 0; i < W; ++i) value[i] = fwv->rawOctets()[i];
00231 } else {
00232 throw InvalidConversionException();
00233 }
00234 }
00235
00236 template <>
00237 inline float FieldValue::get<float>() const {
00238 return getFloatingPointValue<float, 4>();
00239 }
00240
00241 template <>
00242 inline double FieldValue::get<double>() const {
00243 return getFloatingPointValue<double, 8>();
00244 }
00245
00246 template <>
00247 class FixedWidthValue<0> : public FieldValue::Data {
00248 public:
00249
00250 uint32_t encodedSize() const { return 0; }
00251 void encode(Buffer&) {};
00252 void decode(Buffer&) {};
00253 bool operator==(const Data& d) const {
00254 const FixedWidthValue<0>* rhs = dynamic_cast< const FixedWidthValue<0>* >(&d);
00255 return rhs != 0;
00256 }
00257 void print(std::ostream& o) const { o << "F0"; };
00258 };
00259
00260 template <int lenwidth>
00261 class VariableWidthValue : public FieldValue::Data {
00262 std::vector<uint8_t> octets;
00263
00264 public:
00265 VariableWidthValue() {}
00266 VariableWidthValue(const std::vector<uint8_t>& data) : octets(data) {}
00267 VariableWidthValue(const uint8_t* start, const uint8_t* end) : octets(start, end) {}
00268 uint32_t encodedSize() const { return lenwidth + octets.size(); }
00269 void encode(Buffer& buffer) {
00270 buffer.putUInt<lenwidth>(octets.size());
00271 if (octets.size() > 0)
00272 buffer.putRawData(&octets[0], octets.size());
00273 };
00274 void decode(Buffer& buffer) {
00275 uint32_t len = buffer.getUInt<lenwidth>();
00276 octets.resize(len);
00277 if (len > 0)
00278 buffer.getRawData(&octets[0], len);
00279 }
00280 bool operator==(const Data& d) const {
00281 const VariableWidthValue<lenwidth>* rhs = dynamic_cast< const VariableWidthValue<lenwidth>* >(&d);
00282 if (rhs == 0) return false;
00283 else return octets==rhs->octets;
00284 }
00285
00286 bool convertsToString() const { return true; }
00287 std::string getString() const { return std::string(octets.begin(), octets.end()); }
00288
00289 void print(std::ostream& o) const { o << "V" << lenwidth << ":" << octets.size() << ":"; };
00290 };
00291
00292 template <class T>
00293 class EncodedValue : public FieldValue::Data {
00294 T value;
00295 public:
00296
00297 EncodedValue() {}
00298 EncodedValue(const T& v) : value(v) {}
00299
00300 T& getValue() { return value; }
00301 const T& getValue() const { return value; }
00302
00303 uint32_t encodedSize() const { return value.encodedSize(); }
00304
00305 void encode(Buffer& buffer) {
00306 value.encode(buffer);
00307 };
00308 void decode(Buffer& buffer) {
00309 value.decode(buffer);
00310 }
00311 bool operator==(const Data& d) const {
00312 const EncodedValue<T>* rhs = dynamic_cast< const EncodedValue<T>* >(&d);
00313 if (rhs == 0) return false;
00314 else return value==rhs->value;
00315 }
00316
00317 void print(std::ostream& o) const { o << "[" << value << "]"; };
00318 };
00319
00324 template <class T>
00325 inline bool FieldValue::get(T& t) const
00326 {
00327 const EncodedValue<T>* v = dynamic_cast< EncodedValue<T>* >(data.get());
00328 if (v != 0) {
00329 t = v->getValue();
00330 return true;
00331 } else {
00332 try {
00333 t = get<T>();
00334 return true;
00335 } catch (const InvalidConversionException&) {
00336 return false;
00337 }
00338 }
00339 }
00340
00341 class Str8Value : public FieldValue {
00342 public:
00343 QPID_COMMON_EXTERN Str8Value(const std::string& v);
00344 };
00345
00346 class Str16Value : public FieldValue {
00347 public:
00348 QPID_COMMON_EXTERN Str16Value(const std::string& v);
00349 };
00350
00351 class Var16Value : public FieldValue {
00352 public:
00353 QPID_COMMON_EXTERN Var16Value(const std::string& v, uint8_t code);
00354 };
00355
00356 class Var32Value : public FieldValue {
00357 public:
00358 QPID_COMMON_EXTERN Var32Value(const std::string& v, uint8_t code);
00359 };
00360
00361 class Struct32Value : public FieldValue {
00362 public:
00363 QPID_COMMON_EXTERN Struct32Value(const std::string& v);
00364 };
00365
00366 class FloatValue : public FieldValue
00367 {
00368 public:
00369 QPID_COMMON_EXTERN FloatValue(float f);
00370 };
00371 class DoubleValue : public FieldValue
00372 {
00373 public:
00374 QPID_COMMON_EXTERN DoubleValue(double f);
00375 };
00376
00377
00378
00379
00380 class IntegerValue : public FieldValue {
00381 public:
00382 QPID_COMMON_EXTERN IntegerValue(int v);
00383 };
00384
00385 class TimeValue : public FieldValue {
00386 public:
00387 QPID_COMMON_EXTERN TimeValue(uint64_t v);
00388 };
00389
00390 class Integer64Value : public FieldValue {
00391 public:
00392 QPID_COMMON_EXTERN Integer64Value(int64_t v);
00393 };
00394
00395 class Unsigned64Value : public FieldValue {
00396 public:
00397 QPID_COMMON_EXTERN Unsigned64Value(uint64_t v);
00398 };
00399
00400 class FieldTableValue : public FieldValue {
00401 public:
00402 typedef FieldTable ValueType;
00403 QPID_COMMON_EXTERN FieldTableValue(const FieldTable&);
00404 };
00405
00406 class ArrayValue : public FieldValue {
00407 public:
00408 QPID_COMMON_EXTERN ArrayValue(const Array&);
00409 };
00410
00411 class VoidValue : public FieldValue {
00412 public:
00413 QPID_COMMON_EXTERN VoidValue();
00414 };
00415
00416 class BoolValue : public FieldValue {
00417 public:
00418 QPID_COMMON_EXTERN BoolValue(bool);
00419 };
00420
00421 class Unsigned8Value : public FieldValue {
00422 public:
00423 QPID_COMMON_EXTERN Unsigned8Value(uint8_t);
00424 };
00425
00426 class Unsigned16Value : public FieldValue {
00427 public:
00428 QPID_COMMON_EXTERN Unsigned16Value(uint16_t);
00429 };
00430
00431 class Unsigned32Value : public FieldValue {
00432 public:
00433 QPID_COMMON_EXTERN Unsigned32Value(uint32_t);
00434 };
00435
00436 class Integer8Value : public FieldValue {
00437 public:
00438 QPID_COMMON_EXTERN Integer8Value(int8_t);
00439 };
00440
00441 class Integer16Value : public FieldValue {
00442 public:
00443 QPID_COMMON_EXTERN Integer16Value(int16_t);
00444 };
00445
00446 typedef IntegerValue Integer32Value;
00447
00448 class ListValue : public FieldValue {
00449 public:
00450 typedef List ValueType;
00451 QPID_COMMON_EXTERN ListValue(const List&);
00452 };
00453
00454 class UuidValue : public FieldValue {
00455 public:
00456 QPID_COMMON_EXTERN UuidValue(const unsigned char*);
00457 };
00458
00459 template <class T>
00460 bool getEncodedValue(FieldTable::ValuePtr vptr, T& value)
00461 {
00462 if (vptr) {
00463 const EncodedValue<T>* ev = dynamic_cast< EncodedValue<T>* >(&(vptr->getData()));
00464 if (ev != 0) {
00465 value = ev->getValue();
00466 return true;
00467 }
00468 }
00469 return false;
00470 }
00471
00472 }}
00473
00474 #endif