TemporalValueReader.java

/**
 * Copyright (c) 2022-2025 Contributors to the OpenNTF Home App Project
 *
 * 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
 *
 *     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 model;

import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;
import java.util.Date;

import org.eclipse.jnosql.communication.ValueReader;

public class TemporalValueReader implements ValueReader {

	@Override
	public boolean test(Class<?> c) {
		return Temporal.class.equals(c);
	}

	@SuppressWarnings("unchecked")
	@Override
	public <T> T read(Class<T> clazz, Object value) {
		if(value instanceof Temporal) {
			return (T)value;
		} else if(value == null) {
			return null;
		} else if(value instanceof Date) {
			return (T)((Date)value).toInstant();
		} else {
			String v = value.toString();
			if(v.isEmpty()) {
				return null;
			} else {
				// Try several common formatters
				try {
					TemporalAccessor dt = DateTimeFormatter.ISO_OFFSET_DATE_TIME.parse(v);
					return (T)OffsetDateTime.from(dt);
				} catch(DateTimeParseException e) {
				}
				try {
					TemporalAccessor dt = DateTimeFormatter.ISO_ZONED_DATE_TIME.parse(v);
					return (T)ZonedDateTime.from(dt);
				} catch(DateTimeParseException e) {
				}
				try {
					TemporalAccessor dt = DateTimeFormatter.ISO_LOCAL_DATE.parse(v);
					return (T)LocalDate.from(dt);
				} catch(DateTimeParseException e) {
				}
				try {
					TemporalAccessor dt = DateTimeFormatter.ISO_LOCAL_TIME.parse(v);
					return (T)LocalTime.from(dt);
				} catch(DateTimeParseException e) {
				}
				TemporalAccessor dt = DateTimeFormatter.ISO_INSTANT.parse(v);
				return (T)Instant.from(dt);
			}
		}
	}

}