我有一个形式的 protobuf 消息
enum PolicyValidationType {
Number = 0;
}
message NumberPolicyValidation {
optional int64 maxValue = 1;
optional int64 minValue = 2;
}
message PolicyObject {
required string key = 1;
optional string value = 2;
optional string name = 3;
optional PolicyValidationType validationType = 4;
optional NumberPolicyValidation numberPolicyValidation = 5;
}
例如
policyObject {
key: "sessionIdleTimeoutInSecs"
value: "1800"
name: "Session Idle Timeout"
validationType: Number
numberPolicyValidation {
maxValue: 3600
minValue: 5
}
}
谁能告诉我如何将其转换为如下所示的 Map
:-
{validationType=Number, name=Session Idle Timeout, numberPolicyValidation={maxValue=3600.0, minValue=5.0}, value=1800, key=sessionIdleTimeoutInSecs}
我能想到的一种方法是将其转换为 json,然后将 json 转换为 map?
PolicyObject policyObject;
...
JsonFormat jsonFormat = new JsonFormat();
final String s = jsonFormat.printToString(policyObject);
Type objectMapType = new TypeToken<HashMap<String, Object>>() {}.getType();
Gson gson = new GsonBuilder().registerTypeAdapter(new TypeToken<HashMap<String,Object>>(){}.getType(), new PrimitiveDeserializer()).create();
Map<String, Object> mappedObject = gson.fromJson(s, objectMapType);
我认为一定有更好的方法。有人可以建议任何更好的方法吗?
最佳答案
我创建了小型专用类以将任何 Google Protocol Buffer 消息一般转换为 Java 映射。
public class ProtoUtil {
@NotNull
public Map<String, Object> protoToMap(Message proto) {
final Map<Descriptors.FieldDescriptor, Object> allFields = proto.getAllFields();
Map<String, Object> map = new LinkedHashMap<>();
for (Map.Entry<Descriptors.FieldDescriptor, Object> entry : allFields.entrySet()) {
final Descriptors.FieldDescriptor fieldDescriptor = entry.getKey();
final Object requestVal = entry.getValue();
final Object mapVal = convertVal(proto, fieldDescriptor, requestVal);
if (mapVal != null) {
final String fieldName = fieldDescriptor.getName();
map.put(fieldName, mapVal);
}
}
return map;
}
@Nullable
/*package*/ Object convertVal(@NotNull Message proto, @NotNull Descriptors.FieldDescriptor fieldDescriptor, @Nullable Object protoVal) {
Object result = null;
if (protoVal != null) {
if (fieldDescriptor.isRepeated()) {
if (proto.getRepeatedFieldCount(fieldDescriptor) > 0) {
final List originals = (List) protoVal;
final List copies = new ArrayList(originals.size());
for (Object original : originals) {
copies.add(convertAtomicVal(fieldDescriptor, original));
}
result = copies;
}
} else {
result = convertAtomicVal(fieldDescriptor, protoVal);
}
}
return result;
}
@Nullable
/*package*/ Object convertAtomicVal(@NotNull Descriptors.FieldDescriptor fieldDescriptor, @Nullable Object protoVal) {
Object result = null;
if (protoVal != null) {
switch (fieldDescriptor.getJavaType()) {
case INT:
case LONG:
case FLOAT:
case DOUBLE:
case BOOLEAN:
case STRING:
result = protoVal;
break;
case BYTE_STRING:
case ENUM:
result = protoVal.toString();
break;
case MESSAGE:
result = protoToMap((Message) protoVal);
break;
}
}
return result;
}
}
希望对您有所帮助!分享和享受。
关于java - 如何将 Protocol Buffer 消息转换为 java 中的 HashMap?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48821916/