normanj-bitquill commented on code in PR #3773: URL: https://github.com/apache/calcite/pull/3773#discussion_r1583854741
########## core/src/main/java/org/apache/calcite/util/format/PostgresqlDateTimeFormatter.java: ########## @@ -0,0 +1,660 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to you 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 + * + * http://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. + */ +package org.apache.calcite.util.format; + +import java.text.ParsePosition; +import java.time.Month; +import java.time.ZonedDateTime; +import java.time.format.TextStyle; +import java.time.temporal.ChronoField; +import java.time.temporal.IsoFields; +import java.time.temporal.JulianFields; +import java.util.Locale; +import java.util.function.Function; + +/** + * Provides an implementation of toChar that matches PostgreSQL behaviour. + */ +public class PostgresqlDateTimeFormatter { + /** + * Result of applying a format element to the current position in the format + * string. If matched, will contain the output from applying the format + * element. + */ + private static class PatternConvertResult { + final boolean matched; + final String formattedString; + + protected PatternConvertResult() { + matched = false; + formattedString = ""; + } + + protected PatternConvertResult(boolean matched, String formattedString) { + this.matched = matched; + this.formattedString = formattedString; + } + } + + /** + * A format element that is able to produce a string from a date. + */ + private interface FormatPattern { + /** + * Checks if the current position in the format string applies to this format + * element. Will produce a formatted string if matched that is the format element Review Comment: I've tried to reword this. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@calcite.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
