com.turn.shapeshifter.transformers.DateTimeTransformer.java Source code

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Here is the source code for com.turn.shapeshifter.transformers.DateTimeTransformer.java

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/**
 * Copyright 2012, 2013 Turn, Inc.
 *
 * 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.turn.shapeshifter.transformers;

import com.turn.shapeshifter.FormatTransformer;
import com.turn.shapeshifter.ShapeshifterProtos.JsonType;

import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.NullNode;
import com.fasterxml.jackson.databind.node.TextNode;
import com.google.common.base.Preconditions;

import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;

/**
 * Marshalls a Unix epoch in milliseconds into a ISO-8601-formatted string.
 * 
 * @author jsilland
 * 
 * @see <a href="http://www.ietf.org/rfc/rfc3339.txt">RFC 3339</a>
 */
public class DateTimeTransformer implements FormatTransformer {

    private static final DateTimeFormatter ISO_8601 = ISODateTimeFormat.dateTime().withZone(DateTimeZone.UTC);
    private static final String DATE_TIME_FORMAT = "date-time";

    /** 
     * @param object the number of milliseconds since the Unix epoch
     */
    @Override
    public JsonNode serialize(Object object) {
        if (object == null) {
            return NullNode.instance;
        }
        Preconditions.checkArgument(object instanceof Long);
        Long millis = (Long) object;
        return new TextNode(ISO_8601.print(millis));
    }

    /** 
     * @param node a date formatted using ISO 8601
     */
    @Override
    public Object parse(JsonNode node) {
        Preconditions.checkArgument(JsonToken.VALUE_STRING.equals(node.asToken()));
        String nodeValue = node.asText();
        return new Long(ISO_8601.parseMillis(nodeValue));
    }

    /** 
     * {@inheritDoc}
     */
    @Override
    public JsonType getJsonType() {
        return JsonType.STRING;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String getExternalFormat() {
        return DATE_TIME_FORMAT;
    }
}