dev.miku.r2dbc.mysql.codec.OffsetDateTimeCodec Maven / Gradle / Ivy

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/*
 * Copyright 2018-2020 the original author or authors.
 *
 * 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 dev.miku.r2dbc.mysql.codec;

import dev.miku.r2dbc.mysql.Parameter;
import dev.miku.r2dbc.mysql.ParameterWriter;
import dev.miku.r2dbc.mysql.constant.DataTypes;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import reactor.core.publisher.Mono;

import java.time.LocalDateTime;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;

/**
 * Codec for {@link OffsetDateTime}.
 */
final class OffsetDateTimeCodec implements Codec {

    private final ByteBufAllocator allocator;

    OffsetDateTimeCodec(ByteBufAllocator allocator) {
        this.allocator = allocator;
    }

    @Override
    public OffsetDateTime decode(ByteBuf value, FieldInformation info, Class target, boolean binary, CodecContext context) {
        LocalDateTime origin = LocalDateTimeCodec.decodeOrigin(value, binary, context);

        if (origin == null) {
            return null;
        }

        ZoneId zone = context.getServerZoneId();

        return OffsetDateTime.of(origin, zone instanceof ZoneOffset ? (ZoneOffset) zone : zone.getRules().getOffset(origin));
    }

    @Override
    public Parameter encode(Object value, CodecContext context) {
        return new OffsetDateTimeParameter(allocator, (OffsetDateTime) value, context);
    }

    @Override
    public boolean canEncode(Object value) {
        return value instanceof OffsetDateTime;
    }

    @Override
    public boolean canDecode(FieldInformation info, Class target) {
        return DateTimes.canDecodeDateTime(info.getType(), target, OffsetDateTime.class);
    }

    private static final class OffsetDateTimeParameter extends AbstractParameter {

        private final ByteBufAllocator allocator;

        private final OffsetDateTime value;

        private final CodecContext context;

        private OffsetDateTimeParameter(ByteBufAllocator allocator, OffsetDateTime value, CodecContext context) {
            this.allocator = allocator;
            this.value = value;
            this.context = context;
        }

        @Override
        public Mono publishBinary() {
            return Mono.fromSupplier(() -> LocalDateTimeCodec.encodeBinary(allocator, serverValue()));
        }

        @Override
        public Mono publishText(ParameterWriter writer) {
            return Mono.fromRunnable(() -> LocalDateTimeCodec.encodeText(writer, serverValue()));
        }

        @Override
        public short getType() {
            return DataTypes.TIMESTAMP;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }
            OffsetDateTimeParameter that = (OffsetDateTimeParameter) o;
            return value.equals(that.value);
        }

        @Override
        public int hashCode() {
            return value.hashCode();
        }

        private LocalDateTime serverValue() {
            ZoneId zone = context.getServerZoneId();
            return zone instanceof ZoneOffset ? value.withOffsetSameInstant((ZoneOffset) zone).toLocalDateTime() :
                value.toZonedDateTime().withZoneSameInstant(zone).toLocalDateTime();
        }
    }
}