com.github.piasy.common.android.utils.model.CustomZonedDateTimeConverter.java Source code

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Here is the source code for com.github.piasy.common.android.utils.model.CustomZonedDateTimeConverter.java

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/*
 * Copyright 2014 Greg Kopff
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.github.piasy.common.android.utils.model;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import java.lang.reflect.Type;
import org.threeten.bp.ZonedDateTime;
import org.threeten.bp.format.DateTimeFormatter;

/**
 * GSON serialiser/deserialiser for converting {@link ZonedDateTime} objects.
 */
public class CustomZonedDateTimeConverter
        implements JsonSerializer<ZonedDateTime>, JsonDeserializer<ZonedDateTime> {
    /** Formatter. */
    private final DateTimeFormatter mDateTimeFormatter;

    /**
     * Create instance with the given {@link DateTimeFormatter}.
     *
     * @param formatter the given {@link DateTimeFormatter}.
     */
    public CustomZonedDateTimeConverter(final DateTimeFormatter formatter) {
        mDateTimeFormatter = formatter;
    }

    /**
     * Gson invokes this call-back method during serialization when it encounters a field of the
     * specified type. <p>
     *
     * In the implementation of this call-back method, you should consider invoking
     * {@link JsonSerializationContext#serialize(Object, Type)} method to create JsonElements for
     * any
     * non-trivial field of the {@code src} object. However, you should never invoke it on the
     * {@code src} object itself since that will cause an infinite loop (Gson will call your
     * call-back method again).
     *
     * @param src the object that needs to be converted to Json.
     * @param typeOfSrc the actual type (fully genericized version) of the source object.
     * @return a JsonElement corresponding to the specified object.
     */
    @Override
    public JsonElement serialize(final ZonedDateTime src, final Type typeOfSrc,
            final JsonSerializationContext context) {
        return new JsonPrimitive(mDateTimeFormatter.format(src));
    }

    /**
     * Gson invokes this call-back method during deserialization when it encounters a field of the
     * specified type. <p>
     *
     * In the implementation of this call-back method, you should consider invoking
     * {@link JsonDeserializationContext#deserialize(JsonElement, Type)} method to create objects
     * for any non-trivial field of the returned object. However, you should never invoke it on the
     * the same type passing {@code json} since that will cause an infinite loop (Gson will call
     * your
     * call-back method again).
     *
     * @param json The Json data being deserialized
     * @param typeOfT The type of the Object to deserialize to
     * @return a deserialized object of the specified type typeOfT which is a subclass of {@code T}
     * @throws JsonParseException if json is not in the expected format of {@code typeOfT}
     */
    @Override
    public ZonedDateTime deserialize(final JsonElement json, final Type typeOfT,
            final JsonDeserializationContext context) throws JsonParseException {
        return mDateTimeFormatter.parse(json.getAsString(), ZonedDateTime.FROM);
    }
}