/*
* 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.decoder.DecoderColumnHandle;
import com.facebook.presto.decoder.FieldValueProvider;
import com.fasterxml.jackson.databind.JsonNode;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableSet;
import io.airlift.slice.Slice;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
import java.util.Locale;
import java.util.Set;
import static io.airlift.slice.Slices.EMPTY_SLICE;
import static io.airlift.slice.Slices.utf8Slice;
import static java.util.Objects.requireNonNull;
/**
* Milliseconds since the epoch date format decoder.
* <p>
* Uses hardcoded UTC timezone and english locale.
*/
public class MillisecondsSinceEpochJsonFieldDecoder
extends JsonFieldDecoder
{
@VisibleForTesting
static final String NAME = "milliseconds-since-epoch";
/**
* Todo - configurable time zones and locales.
*/
@VisibleForTesting
static final DateTimeFormatter FORMATTER = ISODateTimeFormat.dateTime().withLocale(Locale.ENGLISH).withZoneUTC();
@Override
public Set<Class<?>> getJavaTypes()
{
return ImmutableSet.of(long.class, Slice.class);
}
@Override
public String getFieldDecoderName()
{
return NAME;
}
@Override
public FieldValueProvider decode(JsonNode value, DecoderColumnHandle columnHandle)
{
requireNonNull(columnHandle, "columnHandle is null");
requireNonNull(value, "value is null");
return new MillisecondsSinceEpochJsonValueProvider(value, columnHandle);
}
public static class MillisecondsSinceEpochJsonValueProvider
extends DateTimeJsonValueProvider
{
public MillisecondsSinceEpochJsonValueProvider(JsonNode value, DecoderColumnHandle columnHandle)
{
super(value, columnHandle);
}
@Override
protected long getMillis()
{
return isNull() ? 0L : value.asLong();
}
@Override
public Slice getSlice()
{
return isNull() ? EMPTY_SLICE : utf8Slice(FORMATTER.print(value.asLong()));
}
}
}