Parsing for Maps in JavaNano

javanano/src/main/java/com/google/protobuf/nano/MapUtil.java

+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 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.
+
+package com.google.protobuf.nano;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Utility class for maps support.
+ */
+public final class MapUtil {
+  public static interface MapFactory {
+    <K, V> Map<K, V> forMap(Map<K, V> oldMap);
+  }
+  public static void setMapFactory(MapFactory newMapFactory) {
+    mapFactory = newMapFactory;
+  }
+
+  private static class DefaultMapFactory implements MapFactory {
+    public <K, V> Map<K, V> forMap(Map<K, V> oldMap) {
+      if (oldMap == null) {
+        return new HashMap<K, V>();
+      }
+      return oldMap;
+    }
+  }
+  private static volatile MapFactory mapFactory = new DefaultMapFactory();
+
+  @SuppressWarnings("unchecked")
+  public static final <K, V> Map<K, V> mergeEntry(
+      Map<K, V> target, CodedInputByteBufferNano input,
+      int keyType, int valueType, V value,
+      int keyTag, int valueTag)
+      throws IOException {
+    target = mapFactory.forMap(target);
+    final int length = input.readRawVarint32();
+    final int oldLimit = input.pushLimit(length);
+    K key = null;
+    while (true) {
+      int tag = input.readTag();
+      if (tag == 0) {
+        break;
+      }
+      if (tag == keyTag) {
+        key = (K) input.readData(keyType);
+      } else if (tag == valueTag) {
+        if (valueType == InternalNano.TYPE_MESSAGE) {
+          input.readMessage((MessageNano) value);
+        } else {
+          value = (V) input.readData(valueType);
+        }
+      } else {
+        if (!input.skipField(tag)) {
+          break;
+        }
+      }
+    }
+    input.checkLastTagWas(0);
+    input.popLimit(oldLimit);
+
+    if (key != null) {
+      target.put(key, value);
+    }
+    return target;
+  }
+
+  private MapUtil() {}
+}

src/google/protobuf/compiler/javanano/javanano_map_field.cc

@@ -42,19 +42,69 @@ namespace javanano {
 
 namespace {
 
+string TypeName(const Params& params, const FieldDescriptor* field,
+                bool boxed) {
+  JavaType java_type = GetJavaType(field);
+  switch (java_type) {
+    case JAVATYPE_MESSAGE:
+      return ClassName(params, field->message_type());
+    case JAVATYPE_INT:
+    case JAVATYPE_LONG:
+    case JAVATYPE_FLOAT:
+    case JAVATYPE_DOUBLE:
+    case JAVATYPE_BOOLEAN:
+    case JAVATYPE_STRING:
+    case JAVATYPE_BYTES:
+    case JAVATYPE_ENUM:
+      if (boxed) {
+        return BoxedPrimitiveTypeName(java_type);
+      } else {
+        return PrimitiveTypeName(java_type);
+      }
+    // No default because we want the compiler to complain if any new JavaTypes
+    // are added..
+  }
+
+  GOOGLE_LOG(FATAL) << "should not reach here.";
+  return "";
+}
+
+const FieldDescriptor* KeyField(const FieldDescriptor* descriptor) {
+  GOOGLE_CHECK_EQ(FieldDescriptor::TYPE_MESSAGE, descriptor->type());
+  const Descriptor* message = descriptor->message_type();
+  GOOGLE_CHECK(message->options().map_entry());
+  return message->FindFieldByName("key");
+}
+
+const FieldDescriptor* ValueField(const FieldDescriptor* descriptor) {
+  GOOGLE_CHECK_EQ(FieldDescriptor::TYPE_MESSAGE, descriptor->type());
+  const Descriptor* message = descriptor->message_type();
+  GOOGLE_CHECK(message->options().map_entry());
+  return message->FindFieldByName("value");
+}
+
 void SetMapVariables(const Params& params,
     const FieldDescriptor* descriptor, map<string, string>* variables) {
+  const FieldDescriptor* key = KeyField(descriptor);
+  const FieldDescriptor* value = ValueField(descriptor);
   (*variables)["name"] =
     RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
-  (*variables)["capitalized_name"] =
-    RenameJavaKeywords(UnderscoresToCapitalizedCamelCase(descriptor));
-  (*variables)["number"] = SimpleItoa(descriptor->number());
-  (*variables)["type"] = "java.lang.Integer";
-  (*variables)["default"] = "null";
-  (*variables)["tag"] = SimpleItoa(internal::WireFormat::MakeTag(descriptor));
-  (*variables)["tag_size"] = SimpleItoa(
-      internal::WireFormat::TagSize(descriptor->number(), descriptor->type()));
-  (*variables)["message_name"] = descriptor->containing_type()->name();
+  (*variables)["key_type"] = TypeName(params, key, false);
+  (*variables)["boxed_key_type"] = TypeName(params,key, true);
+  (*variables)["key_desc_type"] =
+      "TYPE_" + ToUpper(FieldDescriptor::TypeName(key->type()));
+  (*variables)["key_tag"] = SimpleItoa(internal::WireFormat::MakeTag(key));
+  (*variables)["value_type"] = TypeName(params, value, false);
+  (*variables)["boxed_value_type"] = TypeName(params, value, true);
+  (*variables)["value_desc_type"] =
+      "TYPE_" + ToUpper(FieldDescriptor::TypeName(value->type()));
+  (*variables)["value_tag"] = SimpleItoa(internal::WireFormat::MakeTag(value));
+  (*variables)["type_parameters"] =
+      (*variables)["boxed_key_type"] + ", " + (*variables)["boxed_value_type"];
+  (*variables)["value_default"] =
+      value->type() == FieldDescriptor::TYPE_MESSAGE
+          ? "new " + (*variables)["value_type"] + "()"
+          : "null";
 }
 }  // namespace
 
@@ -70,7 +120,7 @@ MapFieldGenerator::~MapFieldGenerator() {}
 void MapFieldGenerator::
 GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
   printer->Print(variables_,
-    "public $type$ $name$;\n");
+    "public java.util.Map<$type_parameters$> $name$;\n");
 }
 
 void MapFieldGenerator::
@@ -79,6 +129,34 @@ GenerateClearCode(io::Printer* printer) const {
     "$name$ = null;\n");
 }
 
+void MapFieldGenerator::
+GenerateMergingCode(io::Printer* printer) const {
+  printer->Print(variables_,
+    "$name$ = com.google.protobuf.nano.MapUtil.mergeEntry(\n"
+    "  $name$, input,\n"
+    "  com.google.protobuf.nano.InternalNano.$key_desc_type$,\n"
+    "  com.google.protobuf.nano.InternalNano.$value_desc_type$,\n"
+    "  $value_default$,\n"
+    "  $key_tag$, $value_tag$);\n"
+    "\n");
+}
+
+void MapFieldGenerator::
+GenerateSerializationCode(io::Printer* printer) const {
+}
+
+void MapFieldGenerator::
+GenerateSerializedSizeCode(io::Printer* printer) const {
+}
+
+void MapFieldGenerator::
+GenerateEqualsCode(io::Printer* printer) const {
+}
+
+void MapFieldGenerator::
+GenerateHashCodeCode(io::Printer* printer) const {
+}
+
 }  // namespace javanano
 }  // namespace compiler
 }  // namespace protobuf

src/google/protobuf/compiler/javanano/javanano_map_field.h

@@ -50,16 +50,15 @@ class MapFieldGenerator : public FieldGenerator {
   // implements FieldGenerator ---------------------------------------
   void GenerateMembers(io::Printer* printer, bool lazy_init) const;
   void GenerateClearCode(io::Printer* printer) const;
-  // void GenerateMergingCode(io::Printer* printer) const;
-  // void GenerateSerializationCode(io::Printer* printer) const;
-  // void GenerateSerializedSizeCode(io::Printer* printer) const;
-  // void GenerateEqualsCode(io::Printer* printer) const;
-  // void GenerateHashCodeCode(io::Printer* printer) const;
+  void GenerateMergingCode(io::Printer* printer) const;
+  void GenerateSerializationCode(io::Printer* printer) const;
+  void GenerateSerializedSizeCode(io::Printer* printer) const;
+  void GenerateEqualsCode(io::Printer* printer) const;
+  void GenerateHashCodeCode(io::Printer* printer) const;
 
  private:
   const FieldDescriptor* descriptor_;
   map<string, string> variables_;
-  vector<string> canonical_values_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapFieldGenerator);
 };