/*
* 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.collect.ImmutableSet;
import io.airlift.slice.Slice;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import java.util.Locale;
import java.util.Set;
import static java.util.Objects.requireNonNull;
/**
* Custom date format decoder.
* <p>
* <tt>formatHint</tt> uses {@link org.joda.time.format.DateTimeFormatter} format.
* <p>
* Uses hardcoded UTC timezone and english locale.
*/
public class CustomDateTimeJsonFieldDecoder
extends JsonFieldDecoder
{
@Override
public Set<Class<?>> getJavaTypes()
{
return ImmutableSet.of(long.class, Slice.class);
}
@Override
public String getFieldDecoderName()
{
return "custom-date-time";
}
@Override
public FieldValueProvider decode(JsonNode value, DecoderColumnHandle columnHandle)
{
requireNonNull(columnHandle, "columnHandle is null");
requireNonNull(value, "value is null");
return new CustomDateTimeJsonValueProvider(value, columnHandle);
}
public static class CustomDateTimeJsonValueProvider
extends DateTimeJsonValueProvider
{
public CustomDateTimeJsonValueProvider(JsonNode value, DecoderColumnHandle columnHandle)
{
super(value, columnHandle);
}
@Override
protected long getMillis()
{
if (isNull()) {
return 0L;
}
if (value.canConvertToLong()) {
return value.asLong();
}
requireNonNull(columnHandle.getFormatHint(), "formatHint is null");
String textValue = value.isValueNode() ? value.asText() : value.toString();
DateTimeFormatter formatter = DateTimeFormat.forPattern(columnHandle.getFormatHint()).withLocale(Locale.ENGLISH).withZoneUTC();
return formatter.parseMillis(textValue);
}
}
}