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/*
 * 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 com.facebook.presto.decoder.json;

import com.facebook.presto.common.type.Type;
import com.facebook.presto.decoder.DecoderColumnHandle;
import com.facebook.presto.decoder.FieldValueProvider;
import com.facebook.presto.spi.PrestoException;
import com.fasterxml.jackson.databind.JsonNode;
import com.google.common.collect.ImmutableSet;

import java.time.ZoneId;
import java.time.format.DateTimeParseException;
import java.time.temporal.TemporalAccessor;
import java.util.Set;
import java.util.concurrent.TimeUnit;

import static com.facebook.presto.common.type.DateTimeEncoding.packDateTimeWithZone;
import static com.facebook.presto.common.type.DateType.DATE;
import static com.facebook.presto.common.type.TimeType.TIME;
import static com.facebook.presto.common.type.TimeWithTimeZoneType.TIME_WITH_TIME_ZONE;
import static com.facebook.presto.common.type.TimeZoneKey.getTimeZoneKey;
import static com.facebook.presto.common.type.TimestampType.TIMESTAMP;
import static com.facebook.presto.common.type.TimestampWithTimeZoneType.TIMESTAMP_WITH_TIME_ZONE;
import static com.facebook.presto.decoder.DecoderErrorCode.DECODER_CONVERSION_NOT_SUPPORTED;
import static com.facebook.presto.decoder.json.JsonRowDecoderFactory.throwUnsupportedColumnType;
import static java.lang.String.format;
import static java.time.format.DateTimeFormatter.ISO_DATE;
import static java.time.format.DateTimeFormatter.ISO_DATE_TIME;
import static java.time.format.DateTimeFormatter.ISO_OFFSET_DATE_TIME;
import static java.time.format.DateTimeFormatter.ISO_OFFSET_TIME;
import static java.time.format.DateTimeFormatter.ISO_TIME;
import static java.time.temporal.ChronoField.EPOCH_DAY;
import static java.time.temporal.ChronoField.INSTANT_SECONDS;
import static java.time.temporal.ChronoField.MILLI_OF_DAY;
import static java.time.temporal.ChronoField.MILLI_OF_SECOND;
import static java.util.Objects.requireNonNull;

/**
 * ISO 8601 date format decoder.
 * 

* Uses hardcoded UTC timezone and english locale. */ public class ISO8601JsonFieldDecoder implements JsonFieldDecoder { private static final Set SUPPORTED_TYPES = ImmutableSet.of(DATE, TIME, TIME_WITH_TIME_ZONE, TIMESTAMP, TIMESTAMP_WITH_TIME_ZONE); private final DecoderColumnHandle columnHandle; public ISO8601JsonFieldDecoder(DecoderColumnHandle columnHandle) { this.columnHandle = requireNonNull(columnHandle, "columnHandle is null"); if (!SUPPORTED_TYPES.contains(columnHandle.getType())) { throwUnsupportedColumnType(columnHandle); } } @Override public FieldValueProvider decode(JsonNode value) { return new ISO8601JsonValueProvider(value, columnHandle); } private static class ISO8601JsonValueProvider extends FieldValueProvider { private final JsonNode value; private final DecoderColumnHandle columnHandle; public ISO8601JsonValueProvider(JsonNode value, DecoderColumnHandle columnHandle) { this.value = value; this.columnHandle = columnHandle; } @Override public boolean isNull() { return value.isMissingNode() || value.isNull(); } @Override public long getLong() { Type columnType = columnHandle.getType(); if (!value.isValueNode()) { throw new PrestoException( DECODER_CONVERSION_NOT_SUPPORTED, format("could not parse non-value node as '%s' for column '%s'", columnType, columnHandle.getName())); } try { String textValue = value.asText(); if (columnType == TIMESTAMP) { // Equivalent to: ISO_DATE_TIME.parse(textValue, LocalDateTime::from).toInstant(UTC).toEpochMilli(); TemporalAccessor parseResult = ISO_DATE_TIME.parse(textValue); return TimeUnit.DAYS.toMillis(parseResult.getLong(EPOCH_DAY)) + parseResult.getLong(MILLI_OF_DAY); } if (columnType == TIMESTAMP_WITH_TIME_ZONE) { // Equivalent to: // ZonedDateTime dateTime = ISO_OFFSET_DATE_TIME.parse(textValue, ZonedDateTime::from); // packDateTimeWithZone(dateTime.toInstant().toEpochMilli(), getTimeZoneKey(dateTime.getZone().getId())); TemporalAccessor parseResult = ISO_OFFSET_DATE_TIME.parse(textValue); return packDateTimeWithZone(parseResult.getLong(INSTANT_SECONDS) * 1000 + parseResult.getLong(MILLI_OF_SECOND), getTimeZoneKey(ZoneId.from(parseResult).getId())); } if (columnType == TIME) { return ISO_TIME.parse(textValue).getLong(MILLI_OF_DAY); } if (columnType == TIME_WITH_TIME_ZONE) { TemporalAccessor parseResult = ISO_OFFSET_TIME.parse(textValue); return packDateTimeWithZone(parseResult.get(MILLI_OF_DAY), getTimeZoneKey(ZoneId.from(parseResult).getId())); } if (columnType == DATE) { return ISO_DATE.parse(textValue).getLong(EPOCH_DAY); } throw new IllegalArgumentException("unsupported type " + columnType); } catch (DateTimeParseException e) { throw new PrestoException( DECODER_CONVERSION_NOT_SUPPORTED, format("could not parse value '%s' as '%s' for column '%s'", value.asText(), columnType, columnHandle.getName())); } } } }





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