Remove unused EpochMillisDateFormatter (#37293)
This class has been superceded by a custom java time epoch millis date parser.
This commit is contained in:
Alexander Reelsen
GitHub
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/*
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* Licensed to Elasticsearch under one or more contributor
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* license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright
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* ownership. Elasticsearch licenses this file to you under
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* the Apache License, Version 2.0 (the "License"); you may
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* 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,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.elasticsearch.common.time;
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import java.math.BigDecimal;
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import java.time.Instant;
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import java.time.ZoneId;
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import java.time.ZoneOffset;
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import java.time.format.DateTimeParseException;
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import java.time.temporal.TemporalAccessor;
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import java.util.Locale;
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import java.util.regex.Pattern;
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/**
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* This is a special formatter to parse the milliseconds since the epoch.
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* There is no way using a native java time date formatter to resemble
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* the required behaviour to parse negative milliseconds as well.
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*
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* This implementation simply tries to convert the input to a long and uses
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* this as the milliseconds since the epoch without involving any other
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* java time code
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*/
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class EpochMillisDateFormatter implements DateFormatter {
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private static final Pattern SPLIT_BY_DOT_PATTERN = Pattern.compile("\\.");
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static final DateFormatter INSTANCE = new EpochMillisDateFormatter();
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static final DateMathParser DATE_MATH_INSTANCE = new JavaDateMathParser(INSTANCE, INSTANCE);
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private EpochMillisDateFormatter() {
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}
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@Override
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public TemporalAccessor parse(String input) {
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try {
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if (input.contains(".")) {
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String[] inputs = SPLIT_BY_DOT_PATTERN.split(input, 2);
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Long milliSeconds = Long.valueOf(inputs[0]);
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if (inputs[1].length() == 0) {
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// this is BWC compatible to joda time, nothing after the dot is allowed
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return Instant.ofEpochMilli(milliSeconds).atZone(ZoneOffset.UTC);
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}
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// scientific notation it is!
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if (inputs[1].contains("e")) {
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return Instant.ofEpochMilli(Double.valueOf(input).longValue()).atZone(ZoneOffset.UTC);
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}
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if (inputs[1].length() > 6) {
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throw new DateTimeParseException("too much granularity after dot [" + input + "]", input, 0);
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}
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Long nanos = new BigDecimal(inputs[1]).movePointRight(6 - inputs[1].length()).longValueExact();
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if (milliSeconds < 0) {
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nanos = nanos * -1;
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}
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return Instant.ofEpochMilli(milliSeconds).plusNanos(nanos).atZone(ZoneOffset.UTC);
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} else {
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return Instant.ofEpochMilli(Long.valueOf(input)).atZone(ZoneOffset.UTC);
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}
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} catch (NumberFormatException e) {
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throw new DateTimeParseException("invalid number [" + input + "]", input, 0, e);
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}
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}
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@Override
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public DateFormatter withZone(ZoneId zoneId) {
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if (ZoneOffset.UTC.equals(zoneId) == false) {
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throw new IllegalArgumentException(pattern() + " date formatter can only be in zone offset UTC");
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}
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return INSTANCE;
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}
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@Override
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public DateFormatter withLocale(Locale locale) {
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if (Locale.ROOT.equals(locale) == false) {
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throw new IllegalArgumentException(pattern() + " date formatter can only be in locale ROOT");
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}
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return this;
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}
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@Override
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public String format(TemporalAccessor accessor) {
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return String.valueOf(Instant.from(accessor).toEpochMilli());
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}
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@Override
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public String pattern() {
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return "epoch_millis";
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}
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@Override
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public Locale locale() {
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return Locale.ROOT;
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}
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@Override
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public ZoneId zone() {
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return ZoneOffset.UTC;
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}
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@Override
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public DateMathParser toDateMathParser() {
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return DATE_MATH_INSTANCE;
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}
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}
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