blob: de207da2c1658cb06e794d9b4fbe21b71af7052c (
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
|
// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CAST_STREAMING_MESSAGE_UTIL_H_
#define CAST_STREAMING_MESSAGE_UTIL_H_
#include "json/value.h"
#include "platform/base/error.h"
namespace openscreen {
namespace cast {
inline Error CreateParseError(const std::string& type) {
return Error(Error::Code::kJsonParseError, "Failed to parse " + type);
}
inline Error CreateParameterError(const std::string& type) {
return Error(Error::Code::kParameterInvalid, "Invalid parameter: " + type);
}
inline ErrorOr<bool> ParseBool(const Json::Value& parent,
const std::string& field) {
const Json::Value& value = parent[field];
if (!value.isBool()) {
return CreateParseError("bool field " + field);
}
return value.asBool();
}
inline ErrorOr<int> ParseInt(const Json::Value& parent,
const std::string& field) {
const Json::Value& value = parent[field];
if (!value.isInt()) {
return CreateParseError("integer field: " + field);
}
return value.asInt();
}
inline ErrorOr<uint32_t> ParseUint(const Json::Value& parent,
const std::string& field) {
const Json::Value& value = parent[field];
if (!value.isUInt()) {
return CreateParseError("unsigned integer field: " + field);
}
return value.asUInt();
}
inline ErrorOr<std::string> ParseString(const Json::Value& parent,
const std::string& field) {
const Json::Value& value = parent[field];
if (!value.isString()) {
return CreateParseError("string field: " + field);
}
return value.asString();
}
// TODO(jophba): refactor to be on ErrorOr itself.
// Use this template for parsing only when there is a reasonable default
// for the type you are using, e.g. int or std::string.
template <typename T>
T ValueOrDefault(const ErrorOr<T>& value, T fallback = T{}) {
if (value.is_value()) {
return value.value();
}
return fallback;
}
} // namespace cast
} // namespace openscreen
#endif // CAST_STREAMING_MESSAGE_UTIL_H_
|
