70 lines
2.8 KiB
Java
70 lines
2.8 KiB
Java
// Copyright (C) 2017 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gerrit.server.notedb;
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import static java.time.format.DateTimeFormatter.ISO_INSTANT;
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import com.google.gson.TypeAdapter;
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonWriter;
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import java.io.IOException;
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import java.sql.Timestamp;
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import java.time.Instant;
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import java.time.LocalDateTime;
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import java.time.ZoneId;
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import java.time.format.DateTimeFormatter;
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import java.time.format.DateTimeParseException;
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import java.time.format.FormatStyle;
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import java.time.temporal.TemporalAccessor;
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/**
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* Adapter that reads/writes {@link Timestamp}s as ISO 8601 instant in UTC.
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*
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* <p>This adapter reads and writes the ISO 8601 UTC instant format, {@code "2015-06-22T17:11:00Z"}.
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* This format is specially chosen because it is also readable by the default Gson type adapter,
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* despite the fact that the default adapter writes in a different format lacking timezones, {@code
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* "Jun 22, 2015 10:11:00 AM"}. Unlike the default adapter format, this representation is not
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* ambiguous during the transition away from DST.
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*
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* <p>This adapter is mutually compatible with the old adapter: the old adapter is able to read the
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* UTC instant format, and this adapter can fall back to parsing the old format.
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*
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* <p>Older Gson versions are not able to parse milliseconds out of ISO 8601 instants, so this
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* implementation truncates to seconds when writing. This is no worse than the truncation that
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* happens to fit NoteDb timestamps into git commit formatting.
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*/
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class CommentTimestampAdapter extends TypeAdapter<Timestamp> {
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private static final DateTimeFormatter FALLBACK =
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DateTimeFormatter.ofLocalizedDateTime(FormatStyle.MEDIUM);
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@Override
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public void write(JsonWriter out, Timestamp ts) throws IOException {
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Timestamp truncated = new Timestamp(ts.getTime() / 1000 * 1000);
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out.value(ISO_INSTANT.format(truncated.toInstant()));
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}
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@Override
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public Timestamp read(JsonReader in) throws IOException {
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String str = in.nextString();
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TemporalAccessor ta;
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try {
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ta = ISO_INSTANT.parse(str);
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} catch (DateTimeParseException e) {
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ta = LocalDateTime.from(FALLBACK.parse(str)).atZone(ZoneId.systemDefault());
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}
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return Timestamp.from(Instant.from(ta));
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}
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}
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