Duration class

A Duration represents a signed, fixed-length span of time represented as a count of seconds and fractions of seconds at nanosecond resolution. It is independent of any calendar and concepts like "day" or "month". It is related to Timestamp in that the difference between two Timestamp values is a Duration and it can be added or subtracted from a Timestamp. Range is approximately +-10,000 years.

Examples

Example 1: Compute Duration from two Timestamps in pseudo code.

 Timestamp start = ...;
 Timestamp end = ...;
 Duration duration = ...;

 duration.seconds = end.seconds - start.seconds;
 duration.nanos = end.nanos - start.nanos;

 if (duration.seconds < 0 && duration.nanos > 0) {
   duration.seconds += 1;
   duration.nanos -= 1000000000;
 } else if (duration.seconds > 0 && duration.nanos < 0) {
   duration.seconds -= 1;
   duration.nanos += 1000000000;
 }

Example 2: Compute Timestamp from Timestamp + Duration in pseudo code.

 Timestamp start = ...;
 Duration duration = ...;
 Timestamp end = ...;

 end.seconds = start.seconds + duration.seconds;
 end.nanos = start.nanos + duration.nanos;

 if (end.nanos < 0) {
   end.seconds -= 1;
   end.nanos += 1000000000;
 } else if (end.nanos >= 1000000000) {
   end.seconds += 1;
   end.nanos -= 1000000000;
 }

Example 3: Compute Duration from datetime.timedelta in Python.

 td = datetime.timedelta(days=3, minutes=10)
 duration = Duration()
 duration.FromTimedelta(td)

JSON Mapping

In JSON format, the Duration type is encoded as a string rather than an object, where the string ends in the suffix "s" (indicating seconds) and is preceded by the number of seconds, with nanoseconds expressed as fractional seconds. For example, 3 seconds with 0 nanoseconds should be encoded in JSON format as "3s", while 3 seconds and 1 nanosecond should be expressed in JSON format as "3.000000001s", and 3 seconds and 1 microsecond should be expressed in JSON format as "3.000001s".

Inheritance

Object
GeneratedMessage
Duration

Constructors

Duration({Int64? seconds, int? nanos}): factory
Duration.fromBuffer(List<int> i, [ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]): factory
Duration.fromJson(String i, [ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]): factory

Properties

eventPlugin → EventPlugin?: Subclasses can override this getter to be notified of changes to protobuf fields.
no setterinherited
hashCode → int: Calculates a hash code based on the contents of the protobuf.
no setterinherited
info_ → BuilderInfo: no setteroverride
isFrozen → bool: Returns true if this message is marked read-only. Otherwise false.
no setterinherited
nanos ↔ int: Signed fractions of a second at nanosecond resolution of the span of time. Durations less than one second are represented with a 0 seconds field and a positive or negative nanos field. For durations of one second or more, a non-zero value for the nanos field must be of the same sign as the seconds field. Must be from -999,999,999 to +999,999,999 inclusive.
getter/setter pair
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
seconds ↔ Int64: Signed seconds of the span of time. Must be from -315,576,000,000 to +315,576,000,000 inclusive. Note: these bounds are computed from: 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
getter/setter pair
unknownFields → UnknownFieldSet: no setterinherited

Methods

addExtension(Extension extension, Object? value) → void: Adds an extension field value to a repeated field.
inherited
check() → void: inherited
clear() → void: Clears all data that was set in this message.
inherited
clearExtension(Extension extension) → void: Clears an extension field and also removes the extension.
inherited
clearField(int tagNumber) → void: Clears the contents of a given field.
inherited
clearNanos() → void
clearSeconds() → void
clone() → Duration: Creates a deep copy of the fields in this message. (The generated code uses mergeFromMessage.)
override
copyWith(void updates(Duration)) → Duration: Apply updates to a copy of this message.
override
createEmptyInstance() → Duration: Creates an empty instance of the same message type as this.
override
createMapField<K, V>(int tagNumber, MapFieldInfo<K, V> fi) → Map<K, V>: Creates a Map representing a map field.
inherited
createRepeatedField<T>(int tagNumber, FieldInfo<T> fi) → List<T>: Creates List implementing a mutable repeated field.
inherited
extensionsAreInitialized() → bool: inherited
freeze() → GeneratedMessage: Make this message read-only.
inherited
getDefaultForField(int tagNumber) → dynamic: Returns the default value for the given field.
inherited
getExtension(Extension extension) → dynamic: Returns the value of extension.
inherited
getField(int tagNumber) → dynamic: Returns the value of the field associated with tagNumber, or the default value if it is not set.
inherited
getFieldOrNull(int tagNumber) → dynamic: Returns the value of a field, ignoring any defaults.
inherited
getTagNumber(String fieldName) → int?: inherited
hasExtension(Extension extension) → bool: Returns true if a value of extension is present.
inherited
hasField(int tagNumber) → bool: Whether this message has a field associated with tagNumber.
inherited
hasNanos() → bool
hasRequiredFields() → bool: Whether the message has required fields.
inherited
hasSeconds() → bool
isInitialized() → bool: Whether all required fields in the message and embedded messages are set.
inherited
mergeFromBuffer(List<int> input, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void: Merges serialized protocol buffer data into this message.
inherited
mergeFromCodedBufferReader(CodedBufferReader input, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void: inherited
mergeFromJson(String data, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void: Merges field values from data, a JSON object, encoded as described by GeneratedMessage.writeToJson.
inherited
mergeFromJsonMap(Map<String, dynamic> json, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void: Merges field values from a JSON object represented as a Dart map.
inherited
mergeFromMessage(GeneratedMessage other) → void: Merges the contents of the other into this message.
inherited
mergeFromProto3Json(Object? json, {TypeRegistry typeRegistry = const TypeRegistry.empty(), bool ignoreUnknownFields = false, bool supportNamesWithUnderscores = true, bool permissiveEnums = false}) → void: Merges field values from json, a JSON object using proto3 encoding.
inherited
mergeUnknownFields(UnknownFieldSet unknownFieldSet) → void: inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
setExtension(Extension extension, Object value) → void: Sets the value of a non-repeated extension field to value.
inherited
setField(int tagNumber, Object value) → void: Sets the value of a field by its tagNumber.
inherited
toBuilder() → GeneratedMessage: Creates a writable, shallow copy of this message.
inherited
toDebugString() → String: Returns a String representation of this message.
inherited
toProto3Json({TypeRegistry typeRegistry = const TypeRegistry.empty()}) → Object?: Returns an Object representing Proto3 JSON serialization of this.
inherited
toString() → String: Returns a String representation of this message.
inherited
writeToBuffer() → Uint8List: inherited
writeToCodedBufferWriter(CodedBufferWriter output) → void: inherited
writeToJson() → String: Returns a JSON string that encodes this message.
inherited
writeToJsonMap() → Map<String, dynamic>: Returns the JSON encoding of this message as a Dart Map.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
inherited

Static Methods

create() → Duration
createRepeated() → PbList<Duration>
getDefault() → Duration