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// Copyright 2020 Google LLC // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // Note: this file is purely for documentation. Any contents are not expected // to be loaded as the JS file. /** * 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 (durations.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". * * @property {number} seconds * 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 * * @property {number} nanos * 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. * * @typedef Duration * @memberof google.protobuf * @see [google.protobuf.Duration definition in proto format]{@link https://github.com/google/protobuf/blob/master/src/google/protobuf/duration.proto} */ const Duration = { // This is for documentation. Actual contents will be loaded by gRPC. };