com.facebook.presto.jdbc.internal.jackson.datatype.joda.deser.DateTimeDeserializer Maven / Gradle / Ivy

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package com.facebook.presto.jdbc.internal.jackson.datatype.joda.deser;

import java.io.IOException;

import com.facebook.presto.jdbc.internal.joda.time.DateTime;
import com.facebook.presto.jdbc.internal.joda.time.DateTimeZone;
import com.facebook.presto.jdbc.internal.joda.time.ReadableDateTime;
import com.facebook.presto.jdbc.internal.joda.time.ReadableInstant;

import com.facebook.presto.jdbc.internal.jackson.core.JsonParser;
import com.facebook.presto.jdbc.internal.jackson.core.JsonProcessingException;
import com.facebook.presto.jdbc.internal.jackson.core.JsonToken;
import com.facebook.presto.jdbc.internal.jackson.databind.DeserializationContext;
import com.facebook.presto.jdbc.internal.jackson.databind.JsonDeserializer;

/**
 * Basic deserializer for {@link ReadableDateTime} and its subtypes.
 * Accepts JSON String and Number values and passes those to single-argument constructor.
 * Does not (yet?) support JSON object; support can be added if desired.
 */
public class DateTimeDeserializer
    extends JodaDeserializerBase
{
    @SuppressWarnings("unchecked")
    public DateTimeDeserializer(Class cls) {
        super((Class)cls);
    }

    @SuppressWarnings("unchecked")
    public static  JsonDeserializer forType(Class cls)
    {
        return (JsonDeserializer) new DateTimeDeserializer(cls);
    }
    
    
    @Override
    public ReadableDateTime deserialize(JsonParser jp, DeserializationContext ctxt)
        throws IOException, JsonProcessingException
    {
        JsonToken t = jp.getCurrentToken();
        if (t == JsonToken.VALUE_NUMBER_INT) {
            return new DateTime(jp.getLongValue(), DateTimeZone.UTC);
        }
        if (t == JsonToken.VALUE_STRING) {
            String str = jp.getText().trim();
            if (str.length() == 0) { // [JACKSON-360]
                return null;
            }
            return new DateTime(str, DateTimeZone.UTC);
        }
        throw ctxt.mappingException(getValueClass());
    }
}