1// Protocol Buffers - Google's data interchange format
2// Copyright 2008 Google Inc.  All rights reserved.
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 <google/protobuf/compiler/javanano/javanano_field.h>
36#include <google/protobuf/compiler/javanano/javanano_helpers.h>
37#include <google/protobuf/compiler/javanano/javanano_primitive_field.h>
38#include <google/protobuf/compiler/javanano/javanano_enum_field.h>
39#include <google/protobuf/compiler/javanano/javanano_message_field.h>
40#include <google/protobuf/stubs/common.h>
41
42namespace google {
43namespace protobuf {
44namespace compiler {
45namespace javanano {
46
47FieldGenerator::~FieldGenerator() {}
48
49bool FieldGenerator::SavedDefaultNeeded() const {
50  // No saved default for this field by default.
51  // Subclasses whose instances may need saved defaults will override this
52  // and return the appropriate value.
53  return false;
54}
55
56void FieldGenerator::GenerateInitSavedDefaultCode(io::Printer* printer) const {
57  // No saved default for this field by default.
58  // Subclasses whose instances may need saved defaults will override this
59  // and generate the appropriate init code to the printer.
60}
61
62void FieldGenerator::GenerateMergingCodeFromPacked(io::Printer* printer) const {
63  // Reaching here indicates a bug. Cases are:
64  //   - This FieldGenerator should support packing, but this method should be
65  //     overridden.
66  //   - This FieldGenerator doesn't support packing, and this method should
67  //     never have been called.
68  GOOGLE_LOG(FATAL) << "GenerateParsingCodeFromPacked() "
69             << "called on field generator that does not support packing.";
70}
71
72// =============================================
73
74FieldGeneratorMap::FieldGeneratorMap(
75    const Descriptor* descriptor, const Params &params)
76  : descriptor_(descriptor),
77    field_generators_(
78      new scoped_ptr<FieldGenerator>[descriptor->field_count()]) {
79
80  int next_has_bit_index = 0;
81  bool saved_defaults_needed = false;
82  // Construct all the FieldGenerators.
83  for (int i = 0; i < descriptor->field_count(); i++) {
84    FieldGenerator* field_generator = MakeGenerator(
85        descriptor->field(i), params, &next_has_bit_index);
86    saved_defaults_needed = saved_defaults_needed
87        || field_generator->SavedDefaultNeeded();
88    field_generators_[i].reset(field_generator);
89  }
90  total_bits_ = next_has_bit_index;
91  saved_defaults_needed_ = saved_defaults_needed;
92}
93
94FieldGenerator* FieldGeneratorMap::MakeGenerator(const FieldDescriptor* field,
95    const Params &params, int* next_has_bit_index) {
96  JavaType java_type = GetJavaType(field);
97  if (field->is_repeated()) {
98    switch (java_type) {
99      case JAVATYPE_MESSAGE:
100        return new RepeatedMessageFieldGenerator(field, params);
101      case JAVATYPE_ENUM:
102        return new RepeatedEnumFieldGenerator(field, params);
103      default:
104        return new RepeatedPrimitiveFieldGenerator(field, params);
105    }
106  } else if (params.optional_field_accessors() && field->is_optional()
107      && java_type != JAVATYPE_MESSAGE) {
108    // We need a has-bit for each primitive/enum field because their default
109    // values could be same as explicitly set values. But we don't need it
110    // for a message field because they have no defaults and Nano uses 'null'
111    // for unset messages, which cannot be set explicitly.
112    switch (java_type) {
113      case JAVATYPE_ENUM:
114        return new AccessorEnumFieldGenerator(
115            field, params, (*next_has_bit_index)++);
116      default:
117        return new AccessorPrimitiveFieldGenerator(
118            field, params, (*next_has_bit_index)++);
119    }
120  } else {
121    switch (java_type) {
122      case JAVATYPE_MESSAGE:
123        return new MessageFieldGenerator(field, params);
124      case JAVATYPE_ENUM:
125        return new EnumFieldGenerator(field, params);
126      default:
127        return new PrimitiveFieldGenerator(field, params);
128    }
129  }
130}
131
132FieldGeneratorMap::~FieldGeneratorMap() {}
133
134const FieldGenerator& FieldGeneratorMap::get(
135    const FieldDescriptor* field) const {
136  GOOGLE_CHECK_EQ(field->containing_type(), descriptor_);
137  return *field_generators_[field->index()];
138}
139
140}  // namespace javanano
141}  // namespace compiler
142}  // namespace protobuf
143}  // namespace google
144