services/dlab-utils/src/main/java/com/epam/dlab/util/mongo/IsoDateDeSerializer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.epam.dlab.util.mongo;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;

import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Deserializes {@link java.util.Date} from JSON
 */
public class IsoDateDeSerializer extends JsonDeserializer<Date> {
    static final String DATE_NODE = "$date";
    static final String ISO_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";

    @Override
    public Date deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        ObjectCodec oc = jsonParser.getCodec();
        JsonNode node = oc.readTree(jsonParser);

        Date date;
        if (node.get(DATE_NODE) != null) {
            String dateValue = node.get(DATE_NODE).asText();
            DateFormat df = new SimpleDateFormat(ISO_DATE_FORMAT);
            try {
                date = df.parse(dateValue);
            } catch (ParseException e) {
                date = new Date(Long.valueOf(dateValue));
            }
        } else {
            date = new Date(node.asLong());
        }
        return date;
    }

}