aboutsummaryrefslogtreecommitdiffstats
path: root/src/google/protobuf/compiler/java/java_enum.cc
blob: 668377a39654adaf5de8e9f71ae2ea3bd4435688 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#include <map>
#include <string>

#include <google/protobuf/compiler/java/java_context.h>
#include <google/protobuf/compiler/java/java_enum.h>
#include <google/protobuf/compiler/java/java_doc_comment.h>
#include <google/protobuf/compiler/java/java_helpers.h>
#include <google/protobuf/compiler/java/java_name_resolver.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/stubs/strutil.h>

namespace google {
namespace protobuf {
namespace compiler {
namespace java {

namespace {
bool EnumHasCustomOptions(const EnumDescriptor* descriptor) {
  if (descriptor->options().unknown_fields().field_count() > 0) return true;
  for (int i = 0; i < descriptor->value_count(); ++i) {
    const EnumValueDescriptor* value = descriptor->value(i);
    if (value->options().unknown_fields().field_count() > 0) return true;
  }
  return false;
}
}  // namespace

EnumGenerator::EnumGenerator(const EnumDescriptor* descriptor,
                             bool immutable_api,
                             Context* context)
  : descriptor_(descriptor), immutable_api_(immutable_api),
    name_resolver_(context->GetNameResolver())  {
  for (int i = 0; i < descriptor_->value_count(); i++) {
    const EnumValueDescriptor* value = descriptor_->value(i);
    const EnumValueDescriptor* canonical_value =
      descriptor_->FindValueByNumber(value->number());

    if (value == canonical_value) {
      canonical_values_.push_back(value);
    } else {
      Alias alias;
      alias.value = value;
      alias.canonical_value = canonical_value;
      aliases_.push_back(alias);
    }
  }
}

EnumGenerator::~EnumGenerator() {}

void EnumGenerator::Generate(io::Printer* printer) {
  WriteEnumDocComment(printer, descriptor_);
  if (HasDescriptorMethods(descriptor_)) {
    printer->Print(
      "public enum $classname$\n"
      "    implements com.google.protobuf.ProtocolMessageEnum {\n",
      "classname", descriptor_->name());
  } else {
    printer->Print(
      "public enum $classname$\n"
      "    implements com.google.protobuf.Internal.EnumLite {\n",
      "classname", descriptor_->name());
  }
  printer->Indent();

  for (int i = 0; i < canonical_values_.size(); i++) {
    map<string, string> vars;
    vars["name"] = canonical_values_[i]->name();
    vars["index"] = SimpleItoa(canonical_values_[i]->index());
    vars["number"] = SimpleItoa(canonical_values_[i]->number());
    WriteEnumValueDocComment(printer, canonical_values_[i]);
    if (canonical_values_[i]->options().deprecated()) {
      printer->Print("@java.lang.Deprecated\n");
    }
    printer->Print(vars,
      "$name$($index$, $number$),\n");
  }

  printer->Print(
    ";\n"
    "\n");

  // -----------------------------------------------------------------

  for (int i = 0; i < aliases_.size(); i++) {
    map<string, string> vars;
    vars["classname"] = descriptor_->name();
    vars["name"] = aliases_[i].value->name();
    vars["canonical_name"] = aliases_[i].canonical_value->name();
    WriteEnumValueDocComment(printer, aliases_[i].value);
    printer->Print(vars,
      "public static final $classname$ $name$ = $canonical_name$;\n");
  }

  for (int i = 0; i < descriptor_->value_count(); i++) {
    map<string, string> vars;
    vars["name"] = descriptor_->value(i)->name();
    vars["number"] = SimpleItoa(descriptor_->value(i)->number());
    WriteEnumValueDocComment(printer, descriptor_->value(i));
    printer->Print(vars,
      "public static final int $name$_VALUE = $number$;\n");
  }
  printer->Print("\n");

  // -----------------------------------------------------------------

  printer->Print(
    "\n"
    "public final int getNumber() { return value; }\n"
    "\n"
    "public static $classname$ valueOf(int value) {\n"
    "  switch (value) {\n",
    "classname", descriptor_->name());
  printer->Indent();
  printer->Indent();

  for (int i = 0; i < canonical_values_.size(); i++) {
    printer->Print(
      "case $number$: return $name$;\n",
      "name", canonical_values_[i]->name(),
      "number", SimpleItoa(canonical_values_[i]->number()));
  }

  printer->Outdent();
  printer->Outdent();
  printer->Print(
    "    default: return null;\n"
    "  }\n"
    "}\n"
    "\n"
    "public static com.google.protobuf.Internal.EnumLiteMap<$classname$>\n"
    "    internalGetValueMap() {\n"
    "  return internalValueMap;\n"
    "}\n"
    "private static com.google.protobuf.Internal.EnumLiteMap<$classname$>\n"
    "    internalValueMap =\n"
    "      new com.google.protobuf.Internal.EnumLiteMap<$classname$>() {\n"
    "        public $classname$ findValueByNumber(int number) {\n"
    "          return $classname$.valueOf(number);\n"
    "        }\n"
    "      };\n"
    "\n",
    "classname", descriptor_->name());

  // -----------------------------------------------------------------
  // Reflection

  if (HasDescriptorMethods(descriptor_)) {
    printer->Print(
      "public final com.google.protobuf.Descriptors.EnumValueDescriptor\n"
      "    getValueDescriptor() {\n"
      "  return getDescriptor().getValues().get(index);\n"
      "}\n"
      "public final com.google.protobuf.Descriptors.EnumDescriptor\n"
      "    getDescriptorForType() {\n"
      "  return getDescriptor();\n"
      "}\n"
      "public static final com.google.protobuf.Descriptors.EnumDescriptor\n"
      "    getDescriptor() {\n");

    // TODO(kenton):  Cache statically?  Note that we can't access descriptors
    //   at module init time because it wouldn't work with descriptor.proto, but
    //   we can cache the value the first time getDescriptor() is called.
    if (descriptor_->containing_type() == NULL) {
      if (!MultipleJavaFiles(descriptor_->file(), immutable_api_)) {
        printer->Print(
          "  return $file$.getDescriptor().getEnumTypes().get($index$);\n",
          "file", name_resolver_->GetClassName(descriptor_->file(),
                                               immutable_api_),
          "index", SimpleItoa(descriptor_->index()));
      } else {
        printer->Indent();
        if (EnumHasCustomOptions(descriptor_)) {
          // We need to load the immutable classes in order to parse custom
          // options. However, since file level enums (no outer class) are
          // shared by immutable code and mutable code, the immutable classes
          // may not exist. So we try to use Java reflection to retrieve the
          // descriptor from immutable classes.
          printer->Print(
            "try {\n"
            "  java.lang.Class immutableFileClass =\n"
            "      java.lang.Class.forName(\"$immutable_file_class_name$\");\n"
            "  @java.lang.SuppressWarnings(\"unchecked\")\n"
            "  java.lang.reflect.Method m =\n"
            "      immutableFileClass.getMethod(\"getDescriptor\");\n"
            "  com.google.protobuf.Descriptors.FileDescriptor file =\n"
            "      (com.google.protobuf.Descriptors.FileDescriptor)\n"
            "          m.invoke(immutableFileClass);\n"
            "  return file.getEnumTypes().get($index$);\n"
            "} catch (Exception e) {\n"
            // Immutable classes cannot be found. Proceed as if custom options
            // don't exist.
            "}\n",
            "immutable_file_class_name",
            name_resolver_->GetImmutableClassName(descriptor_->file()),
            "index", SimpleItoa(descriptor_->index()));
        }
        printer->Print(
          "return $immutable_package$.$descriptor_class$.getDescriptor()\n"
          "    .getEnumTypes().get($index$);\n",
          "immutable_package", FileJavaPackage(descriptor_->file(), true),
          "descriptor_class",
          name_resolver_->GetDescriptorClassName(descriptor_->file()),
          "index", SimpleItoa(descriptor_->index()));
        printer->Outdent();
      }
    } else {
      printer->Print(
          "  return $parent$.$descriptor$.getEnumTypes().get($index$);\n",
          "parent", name_resolver_->GetClassName(descriptor_->containing_type(),
                                                 immutable_api_),
          "descriptor", descriptor_->containing_type()->options()
                        .no_standard_descriptor_accessor()
                        ? "getDefaultInstance().getDescriptorForType()"
                        : "getDescriptor()",
          "index", SimpleItoa(descriptor_->index()));
    }

    printer->Print(
      "}\n"
      "\n"
      "private static final $classname$[] VALUES = ",
      "classname", descriptor_->name());

    if (CanUseEnumValues()) {
      // If the constants we are going to output are exactly the ones we
      // have declared in the Java enum in the same order, then we can use
      // the values() method that the Java compiler automatically generates
      // for every enum.
      printer->Print("values();\n");
    } else {
      printer->Print(
        "{\n"
        "  ");
      for (int i = 0; i < descriptor_->value_count(); i++) {
        printer->Print("$name$, ",
          "name", descriptor_->value(i)->name());
      }
      printer->Print(
          "\n"
          "};\n");
    }

    printer->Print(
      "\n"
      "public static $classname$ valueOf(\n"
      "    com.google.protobuf.Descriptors.EnumValueDescriptor desc) {\n"
      "  if (desc.getType() != getDescriptor()) {\n"
      "    throw new java.lang.IllegalArgumentException(\n"
      "      \"EnumValueDescriptor is not for this type.\");\n"
      "  }\n"
      "  return VALUES[desc.getIndex()];\n"
      "}\n"
      "\n",
      "classname", descriptor_->name());

    // index is only used for reflection; lite implementation does not need it
    printer->Print("private final int index;\n");
  }

  // -----------------------------------------------------------------

  printer->Print(
    "private final int value;\n\n"
    "private $classname$(int index, int value) {\n",
    "classname", descriptor_->name());
  if (HasDescriptorMethods(descriptor_)) {
    printer->Print("  this.index = index;\n");
  }
  printer->Print(
    "  this.value = value;\n"
    "}\n");

  printer->Print(
    "\n"
    "// @@protoc_insertion_point(enum_scope:$full_name$)\n",
    "full_name", descriptor_->full_name());

  printer->Outdent();
  printer->Print("}\n\n");
}

bool EnumGenerator::CanUseEnumValues() {
  if (canonical_values_.size() != descriptor_->value_count()) {
    return false;
  }
  for (int i = 0; i < descriptor_->value_count(); i++) {
    if (descriptor_->value(i)->name() != canonical_values_[i]->name()) {
      return false;
    }
  }
  return true;
}

}  // namespace java
}  // namespace compiler
}  // namespace protobuf
}  // namespace google