1 // Protocol Buffers - Google's data interchange format
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3 // http://code.google.com/p/protobuf/
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30 
31 // Author: kenton@google.com (Kenton Varda)
32 //  Based on original Protocol Buffers design by
33 //  Sanjay Ghemawat, Jeff Dean, and others.
34 
35 #include <map>
36 #include <string>
37 
38 #include <google/protobuf/compiler/javanano/javanano_enum_field.h>
39 #include <google/protobuf/stubs/common.h>
40 #include <google/protobuf/compiler/javanano/javanano_helpers.h>
41 #include <google/protobuf/io/printer.h>
42 #include <google/protobuf/wire_format.h>
43 #include <google/protobuf/stubs/strutil.h>
44 
45 namespace google {
46 namespace protobuf {
47 namespace compiler {
48 namespace javanano {
49 
50 namespace {
51 
52 // TODO(kenton):  Factor out a "SetCommonFieldVariables()" to get rid of
53 //   repeat code between this and the other field types.
SetEnumVariables(const Params & params,const FieldDescriptor * descriptor,map<string,string> * variables)54 void SetEnumVariables(const Params& params,
55     const FieldDescriptor* descriptor, map<string, string>* variables) {
56   (*variables)["name"] =
57     RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
58   (*variables)["capitalized_name"] =
59     RenameJavaKeywords(UnderscoresToCapitalizedCamelCase(descriptor));
60   (*variables)["number"] = SimpleItoa(descriptor->number());
61   if (params.use_reference_types_for_primitives()
62       && !params.reftypes_primitive_enums()
63       && !descriptor->is_repeated()) {
64     (*variables)["type"] = "java.lang.Integer";
65     (*variables)["default"] = "null";
66   } else {
67     (*variables)["type"] = "int";
68     (*variables)["default"] = DefaultValue(params, descriptor);
69   }
70   (*variables)["repeated_default"] =
71       "com.google.protobuf.nano.WireFormatNano.EMPTY_INT_ARRAY";
72   (*variables)["tag"] = SimpleItoa(internal::WireFormat::MakeTag(descriptor));
73   (*variables)["tag_size"] = SimpleItoa(
74       internal::WireFormat::TagSize(descriptor->number(), descriptor->type()));
75   (*variables)["non_packed_tag"] = SimpleItoa(
76       internal::WireFormatLite::MakeTag(descriptor->number(),
77           internal::WireFormat::WireTypeForFieldType(descriptor->type())));
78   (*variables)["message_name"] = descriptor->containing_type()->name();
79   const EnumDescriptor* enum_type = descriptor->enum_type();
80   (*variables)["message_type_intdef"] = "@"
81       + ToJavaName(params, enum_type->name(), true,
82           enum_type->containing_type(), enum_type->file());
83 }
84 
LoadEnumValues(const Params & params,const EnumDescriptor * enum_descriptor,vector<string> * canonical_values)85 void LoadEnumValues(const Params& params,
86     const EnumDescriptor* enum_descriptor, vector<string>* canonical_values) {
87   string enum_class_name = ClassName(params, enum_descriptor);
88   for (int i = 0; i < enum_descriptor->value_count(); i++) {
89     const EnumValueDescriptor* value = enum_descriptor->value(i);
90     const EnumValueDescriptor* canonical_value =
91         enum_descriptor->FindValueByNumber(value->number());
92     if (value == canonical_value) {
93       canonical_values->push_back(
94           enum_class_name + "." + RenameJavaKeywords(value->name()));
95     }
96   }
97 }
98 
PrintCaseLabels(io::Printer * printer,const vector<string> & canonical_values)99 void PrintCaseLabels(
100     io::Printer* printer, const vector<string>& canonical_values) {
101   for (int i = 0; i < canonical_values.size(); i++) {
102     printer->Print(
103       "  case $value$:\n",
104       "value", canonical_values[i]);
105   }
106 }
107 
108 }  // namespace
109 
110 // ===================================================================
111 
112 EnumFieldGenerator::
EnumFieldGenerator(const FieldDescriptor * descriptor,const Params & params)113 EnumFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
114   : FieldGenerator(params), descriptor_(descriptor) {
115   SetEnumVariables(params, descriptor, &variables_);
116   LoadEnumValues(params, descriptor->enum_type(), &canonical_values_);
117 }
118 
~EnumFieldGenerator()119 EnumFieldGenerator::~EnumFieldGenerator() {}
120 
121 void EnumFieldGenerator::
GenerateMembers(io::Printer * printer,bool) const122 GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
123   if (params_.generate_intdefs()) {
124     printer->Print(variables_, "$message_type_intdef$\n");
125   }
126   printer->Print(variables_, "public $type$ $name$;\n");
127 
128   if (params_.generate_has()) {
129     printer->Print(variables_,
130       "public boolean has$capitalized_name$;\n");
131   }
132 }
133 
134 void EnumFieldGenerator::
GenerateClearCode(io::Printer * printer) const135 GenerateClearCode(io::Printer* printer) const {
136   printer->Print(variables_,
137     "$name$ = $default$;\n");
138 
139   if (params_.generate_has()) {
140     printer->Print(variables_,
141       "has$capitalized_name$ = false;\n");
142   }
143 }
144 
145 void EnumFieldGenerator::
GenerateMergingCode(io::Printer * printer) const146 GenerateMergingCode(io::Printer* printer) const {
147   if (params_.store_unknown_fields()) {
148     printer->Print("int initialPos = input.getPosition();\n");
149   }
150   printer->Print(variables_,
151     "int value = input.readInt32();\n"
152     "switch (value) {\n");
153   PrintCaseLabels(printer, canonical_values_);
154   printer->Print(variables_,
155     "    this.$name$ = value;\n");
156   if (params_.generate_has()) {
157     printer->Print(variables_,
158       "    has$capitalized_name$ = true;\n");
159   }
160   printer->Print(
161     "    break;\n");
162   if (params_.store_unknown_fields()) {
163     // If storing unknown fields, store invalid values there.
164     // This is consistent with full protobuf, but note that if a client writes
165     // a new value to this field, both will be serialized on the wire, and
166     // other clients which are aware of unknown fields will see the previous
167     // value, not the new one.
168     printer->Print(
169       "  default:\n"
170       "    input.rewindToPosition(initialPos);\n"
171       "    storeUnknownField(input, tag);\n"
172       "    break;\n");
173   }
174   printer->Print("}\n");
175 }
176 
177 void EnumFieldGenerator::
GenerateSerializationCode(io::Printer * printer) const178 GenerateSerializationCode(io::Printer* printer) const {
179   if (descriptor_->is_required() && !params_.generate_has()) {
180     // Always serialize a required field if we don't have the 'has' signal.
181     printer->Print(variables_,
182       "output.writeInt32($number$, this.$name$);\n");
183   } else {
184     if (params_.generate_has()) {
185       printer->Print(variables_,
186         "if (this.$name$ != $default$ || has$capitalized_name$) {\n");
187     } else {
188       printer->Print(variables_,
189         "if (this.$name$ != $default$) {\n");
190     }
191     printer->Print(variables_,
192       "  output.writeInt32($number$, this.$name$);\n"
193       "}\n");
194   }
195 }
196 
197 void EnumFieldGenerator::
GenerateSerializedSizeCode(io::Printer * printer) const198 GenerateSerializedSizeCode(io::Printer* printer) const {
199   if (descriptor_->is_required() && !params_.generate_has()) {
200     printer->Print(variables_,
201       "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
202       "  .computeInt32Size($number$, this.$name$);\n");
203   } else {
204     if (params_.generate_has()) {
205       printer->Print(variables_,
206         "if (this.$name$ != $default$ || has$capitalized_name$) {\n");
207     } else {
208       printer->Print(variables_,
209         "if (this.$name$ != $default$) {\n");
210     }
211     printer->Print(variables_,
212       "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
213       "    .computeInt32Size($number$, this.$name$);\n"
214       "}\n");
215   }
216 }
217 
GenerateEqualsCode(io::Printer * printer) const218 void EnumFieldGenerator::GenerateEqualsCode(io::Printer* printer) const {
219   if (params_.use_reference_types_for_primitives()
220         && !params_.reftypes_primitive_enums()) {
221     printer->Print(variables_,
222       "if (this.$name$ == null) {\n"
223       "  if (other.$name$ != null) {\n"
224       "    return false;\n"
225       "  }\n"
226       "} else if (!this.$name$.equals(other.$name$)) {\n"
227       "  return false;"
228       "}\n");
229   } else {
230     // We define equality as serialized form equality. If generate_has(),
231     // then if the field value equals the default value in both messages,
232     // but one's 'has' field is set and the other's is not, the serialized
233     // forms are different and we should return false.
234     printer->Print(variables_,
235       "if (this.$name$ != other.$name$");
236     if (params_.generate_has()) {
237       printer->Print(variables_,
238         "\n"
239         "    || (this.$name$ == $default$\n"
240         "        && this.has$capitalized_name$ != other.has$capitalized_name$)");
241     }
242     printer->Print(") {\n"
243       "  return false;\n"
244       "}\n");
245   }
246 }
247 
GenerateHashCodeCode(io::Printer * printer) const248 void EnumFieldGenerator::GenerateHashCodeCode(io::Printer* printer) const {
249   printer->Print(
250     "result = 31 * result + ");
251   if (params_.use_reference_types_for_primitives()
252         && !params_.reftypes_primitive_enums()) {
253     printer->Print(variables_,
254       "(this.$name$ == null ? 0 : this.$name$)");
255   } else {
256     printer->Print(variables_,
257       "this.$name$");
258   }
259   printer->Print(";\n");
260 }
261 
262 // ===================================================================
263 
264 AccessorEnumFieldGenerator::
AccessorEnumFieldGenerator(const FieldDescriptor * descriptor,const Params & params,int has_bit_index)265 AccessorEnumFieldGenerator(const FieldDescriptor* descriptor,
266     const Params& params, int has_bit_index)
267   : FieldGenerator(params), descriptor_(descriptor) {
268   SetEnumVariables(params, descriptor, &variables_);
269   LoadEnumValues(params, descriptor->enum_type(), &canonical_values_);
270   SetBitOperationVariables("has", has_bit_index, &variables_);
271 }
272 
~AccessorEnumFieldGenerator()273 AccessorEnumFieldGenerator::~AccessorEnumFieldGenerator() {}
274 
275 void AccessorEnumFieldGenerator::
GenerateMembers(io::Printer * printer,bool) const276 GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
277   printer->Print(variables_, "private int $name$_;\n");
278   if (params_.generate_intdefs()) {
279     printer->Print(variables_, "$message_type_intdef$\n");
280   }
281   printer->Print(variables_,
282     "public int get$capitalized_name$() {\n"
283     "  return $name$_;\n"
284     "}\n"
285     "public $message_name$ set$capitalized_name$(");
286   if (params_.generate_intdefs()) {
287     printer->Print(variables_,
288       "\n"
289       "    $message_type_intdef$ ");
290   }
291   printer->Print(variables_,
292     "int value) {\n"
293     "  $name$_ = value;\n"
294     "  $set_has$;\n"
295     "  return this;\n"
296     "}\n"
297     "public boolean has$capitalized_name$() {\n"
298     "  return $get_has$;\n"
299     "}\n"
300     "public $message_name$ clear$capitalized_name$() {\n"
301     "  $name$_ = $default$;\n"
302     "  $clear_has$;\n"
303     "  return this;\n"
304     "}\n");
305 }
306 
307 void AccessorEnumFieldGenerator::
GenerateClearCode(io::Printer * printer) const308 GenerateClearCode(io::Printer* printer) const {
309   printer->Print(variables_,
310     "$name$_ = $default$;\n");
311 }
312 
313 void AccessorEnumFieldGenerator::
GenerateMergingCode(io::Printer * printer) const314 GenerateMergingCode(io::Printer* printer) const {
315   if (params_.store_unknown_fields()) {
316     printer->Print("int initialPos = input.getPosition();\n");
317   }
318   printer->Print(variables_,
319     "int value = input.readInt32();\n"
320     "switch (value) {\n");
321   PrintCaseLabels(printer, canonical_values_);
322   printer->Print(variables_,
323     "    $name$_ = value;\n"
324     "    $set_has$;\n"
325     "    break;\n");
326   if (params_.store_unknown_fields()) {
327     // If storing unknown fields, store invalid values there.
328     // This is consistent with full protobuf, but note that if a client writes
329     // a new value to this field, both will be serialized on the wire, and
330     // other clients which are aware of unknown fields will see the previous
331     // value, not the new one.
332     printer->Print(
333       "  default:\n"
334       "    input.rewindToPosition(initialPos);\n"
335       "    storeUnknownField(input, tag);\n"
336       "    break;\n");
337   }
338   printer->Print("}\n");
339 }
340 
341 void AccessorEnumFieldGenerator::
GenerateSerializationCode(io::Printer * printer) const342 GenerateSerializationCode(io::Printer* printer) const {
343   printer->Print(variables_,
344     "if ($get_has$) {\n"
345     "  output.writeInt32($number$, $name$_);\n"
346     "}\n");
347 }
348 
349 void AccessorEnumFieldGenerator::
GenerateSerializedSizeCode(io::Printer * printer) const350 GenerateSerializedSizeCode(io::Printer* printer) const {
351   printer->Print(variables_,
352     "if ($get_has$) {\n"
353     "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
354     "    .computeInt32Size($number$, $name$_);\n"
355     "}\n");
356 }
357 
358 void AccessorEnumFieldGenerator::
GenerateEqualsCode(io::Printer * printer) const359 GenerateEqualsCode(io::Printer* printer) const {
360   printer->Print(variables_,
361     "if ($different_has$\n"
362     "    || $name$_ != other.$name$_) {\n"
363     "  return false;\n"
364     "}\n");
365 }
366 
367 void AccessorEnumFieldGenerator::
GenerateHashCodeCode(io::Printer * printer) const368 GenerateHashCodeCode(io::Printer* printer) const {
369   printer->Print(variables_,
370     "result = 31 * result + $name$_;\n");
371 }
372 
373 // ===================================================================
374 
375 RepeatedEnumFieldGenerator::
RepeatedEnumFieldGenerator(const FieldDescriptor * descriptor,const Params & params)376 RepeatedEnumFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
377   : FieldGenerator(params), descriptor_(descriptor) {
378   SetEnumVariables(params, descriptor, &variables_);
379   LoadEnumValues(params, descriptor->enum_type(), &canonical_values_);
380 }
381 
~RepeatedEnumFieldGenerator()382 RepeatedEnumFieldGenerator::~RepeatedEnumFieldGenerator() {}
383 
384 void RepeatedEnumFieldGenerator::
GenerateMembers(io::Printer * printer,bool) const385 GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
386   printer->Print(variables_,
387     "public $type$[] $name$;\n");
388 }
389 
390 void RepeatedEnumFieldGenerator::
GenerateClearCode(io::Printer * printer) const391 GenerateClearCode(io::Printer* printer) const {
392   printer->Print(variables_,
393     "$name$ = $repeated_default$;\n");
394 }
395 
396 void RepeatedEnumFieldGenerator::
GenerateMergingCode(io::Printer * printer) const397 GenerateMergingCode(io::Printer* printer) const {
398   // First, figure out the maximum length of the array, then parse,
399   // and finally copy the valid values to the field.
400   printer->Print(variables_,
401     "int length = com.google.protobuf.nano.WireFormatNano\n"
402     "    .getRepeatedFieldArrayLength(input, $non_packed_tag$);\n"
403     "int[] validValues = new int[length];\n"
404     "int validCount = 0;\n"
405     "for (int i = 0; i < length; i++) {\n"
406     "  if (i != 0) { // tag for first value already consumed.\n"
407     "    input.readTag();\n"
408     "  }\n");
409   if (params_.store_unknown_fields()) {
410     printer->Print("  int initialPos = input.getPosition();\n");
411   }
412   printer->Print(
413     "  int value = input.readInt32();\n"
414     "  switch (value) {\n");
415   printer->Indent();
416   PrintCaseLabels(printer, canonical_values_);
417   printer->Outdent();
418   printer->Print(variables_,
419     "      validValues[validCount++] = value;\n"
420     "      break;\n");
421   if (params_.store_unknown_fields()) {
422     // If storing unknown fields, store invalid values there.
423     // This is consistent with full protobuf. Note that this can lead to very
424     // strange behaviors if a value is serialized and reread, e.g. changes in
425     // value ordering.
426     printer->Print(
427       "    default:\n"
428       "      input.rewindToPosition(initialPos);\n"
429       "      storeUnknownField(input, tag);\n"
430       "      break;\n");
431   }
432   printer->Print(variables_,
433     "  }\n"
434     "}\n"
435     "if (validCount != 0) {\n"
436     "  int i = this.$name$ == null ? 0 : this.$name$.length;\n"
437     "  if (i == 0 && validCount == validValues.length) {\n"
438     "    this.$name$ = validValues;\n"
439     "  } else {\n"
440     "    int[] newArray = new int[i + validCount];\n"
441     "    if (i != 0) {\n"
442     "      java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
443     "    }\n"
444     "    java.lang.System.arraycopy(validValues, 0, newArray, i, validCount);\n"
445     "    this.$name$ = newArray;\n"
446     "  }\n"
447     "}\n");
448 }
449 
450 void RepeatedEnumFieldGenerator::
GenerateMergingCodeFromPacked(io::Printer * printer) const451 GenerateMergingCodeFromPacked(io::Printer* printer) const {
452   printer->Print(variables_,
453     "int bytes = input.readRawVarint32();\n"
454     "int limit = input.pushLimit(bytes);\n"
455     "// First pass to compute array length.\n"
456     "int arrayLength = 0;\n"
457     "int startPos = input.getPosition();\n"
458     "while (input.getBytesUntilLimit() > 0) {\n"
459     "  switch (input.readInt32()) {\n");
460   printer->Indent();
461   PrintCaseLabels(printer, canonical_values_);
462   printer->Outdent();
463   printer->Print(variables_,
464     "      arrayLength++;\n"
465     "      break;\n"
466     "  }\n"
467     "}\n"
468     "if (arrayLength != 0) {\n"
469     "  input.rewindToPosition(startPos);\n"
470     "  int i = this.$name$ == null ? 0 : this.$name$.length;\n"
471     "  int[] newArray = new int[i + arrayLength];\n"
472     "  if (i != 0) {\n"
473     "    java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
474     "  }\n"
475     "  while (input.getBytesUntilLimit() > 0) {\n");
476   if (params_.store_unknown_fields()) {
477     printer->Print("    int initialPos = input.getPosition();\n");
478   }
479   printer->Print(variables_,
480     "    int value = input.readInt32();\n"
481     "    switch (value) {\n");
482   printer->Indent();
483   printer->Indent();
484   PrintCaseLabels(printer, canonical_values_);
485   printer->Outdent();
486   printer->Outdent();
487   printer->Print(variables_,
488     "        newArray[i++] = value;\n"
489     "        break;\n");
490   if (params_.store_unknown_fields()) {
491     // If storing unknown fields, store invalid values there.
492     // This is consistent with full protobuf. Note that this can lead to very
493     // strange behaviors if a value is serialized and reread, e.g. changes in
494     // value ordering.
495     printer->Print(variables_,
496       "      default:\n"
497       "        input.rewindToPosition(initialPos);\n"
498       "        storeUnknownField(input, $non_packed_tag$);\n"
499       "        break;\n");
500   }
501   printer->Print(variables_,
502     "    }\n"
503     "  }\n"
504     "  this.$name$ = newArray;\n"
505     "}\n"
506     "input.popLimit(limit);\n");
507 }
508 
509 void RepeatedEnumFieldGenerator::
GenerateRepeatedDataSizeCode(io::Printer * printer) const510 GenerateRepeatedDataSizeCode(io::Printer* printer) const {
511   // Creates a variable dataSize and puts the serialized size in there.
512   printer->Print(variables_,
513     "int dataSize = 0;\n"
514     "for (int i = 0; i < this.$name$.length; i++) {\n"
515     "  int element = this.$name$[i];\n"
516     "  dataSize += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
517     "      .computeInt32SizeNoTag(element);\n"
518     "}\n");
519 }
520 
521 void RepeatedEnumFieldGenerator::
GenerateSerializationCode(io::Printer * printer) const522 GenerateSerializationCode(io::Printer* printer) const {
523   printer->Print(variables_,
524     "if (this.$name$ != null && this.$name$.length > 0) {\n");
525   printer->Indent();
526 
527   if (descriptor_->options().packed()) {
528     GenerateRepeatedDataSizeCode(printer);
529     printer->Print(variables_,
530       "output.writeRawVarint32($tag$);\n"
531       "output.writeRawVarint32(dataSize);\n"
532       "for (int i = 0; i < this.$name$.length; i++) {\n"
533       "  output.writeRawVarint32(this.$name$[i]);\n"
534       "}\n");
535   } else {
536     printer->Print(variables_,
537       "for (int i = 0; i < this.$name$.length; i++) {\n"
538       "  output.writeInt32($number$, this.$name$[i]);\n"
539       "}\n");
540   }
541 
542   printer->Outdent();
543   printer->Print(variables_,
544     "}\n");
545 }
546 
547 void RepeatedEnumFieldGenerator::
GenerateSerializedSizeCode(io::Printer * printer) const548 GenerateSerializedSizeCode(io::Printer* printer) const {
549   printer->Print(variables_,
550     "if (this.$name$ != null && this.$name$.length > 0) {\n");
551   printer->Indent();
552 
553   GenerateRepeatedDataSizeCode(printer);
554 
555   printer->Print(
556     "size += dataSize;\n");
557   if (descriptor_->options().packed()) {
558     printer->Print(variables_,
559       "size += $tag_size$;\n"
560       "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
561       "    .computeRawVarint32Size(dataSize);\n");
562   } else {
563     printer->Print(variables_,
564       "size += $tag_size$ * this.$name$.length;\n");
565   }
566 
567   printer->Outdent();
568 
569   printer->Print(
570     "}\n");
571 }
572 
573 void RepeatedEnumFieldGenerator::
GenerateFixClonedCode(io::Printer * printer) const574 GenerateFixClonedCode(io::Printer* printer) const {
575   printer->Print(variables_,
576     "if (this.$name$ != null && this.$name$.length > 0) {\n"
577     "  cloned.$name$ = this.$name$.clone();\n"
578     "}\n");
579 }
580 
581 void RepeatedEnumFieldGenerator::
GenerateEqualsCode(io::Printer * printer) const582 GenerateEqualsCode(io::Printer* printer) const {
583   printer->Print(variables_,
584     "if (!com.google.protobuf.nano.InternalNano.equals(\n"
585     "    this.$name$, other.$name$)) {\n"
586     "  return false;\n"
587     "}\n");
588 }
589 
590 void RepeatedEnumFieldGenerator::
GenerateHashCodeCode(io::Printer * printer) const591 GenerateHashCodeCode(io::Printer* printer) const {
592   printer->Print(variables_,
593     "result = 31 * result\n"
594     "    + com.google.protobuf.nano.InternalNano.hashCode(this.$name$);\n");
595 }
596 
597 }  // namespace javanano
598 }  // namespace compiler
599 }  // namespace protobuf
600 }  // namespace google
601