com.spotify.docker.client.jackson.UnixTimestampDeserializer.java Source code

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Here is the source code for com.spotify.docker.client.jackson.UnixTimestampDeserializer.java

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/*-
 * -\-\-
 * docker-client
 * --
 * Copyright (C) 2016 Spotify AB
 * --
 * 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.spotify.docker.client.jackson;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

import java.io.IOException;
import java.util.Date;

/**
 * A deserializer for Dates where the source data is in seconds since the epoch rather than
 * milliseconds as {@link Date} expects.
 */
public class UnixTimestampDeserializer extends JsonDeserializer<Date> {

    public UnixTimestampDeserializer() {
    }

    @Override
    public Date deserialize(final JsonParser parser, final DeserializationContext ctxt)
            throws IOException, JsonProcessingException {
        final JsonToken token = parser.getCurrentToken();
        if (token == JsonToken.VALUE_STRING) {
            final String str = parser.getText().trim();
            return toDate(Long.parseLong(str));
        } else if (token == JsonToken.VALUE_NUMBER_INT) {
            return toDate(parser.getLongValue());
        }
        throw ctxt.wrongTokenException(parser, JsonToken.VALUE_STRING, "Expected a string or numeric value");
    }

    private static Date toDate(long secondsSinceEpoch) {
        return new Date(secondsSinceEpoch * 1000);
    }
}