/**
 * Copyright 2015 ArcBees 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.google.appengine.api.datastore;

import java.lang.reflect.Type;
import java.util.Collection;
import java.util.List;

import com.google.common.collect.Lists;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

public class CollectionValueAdapter implements JsonSerializer<Collection<?>>, JsonDeserializer<Collection<?>> {
    @Override
    public Collection<?> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException {
        List<Object> list = Lists.newArrayList();

        for (JsonElement element : json.getAsJsonArray()) {
            PropertyValue propertyValue = context.deserialize(element, PropertyValue.class);
            list.add(propertyValue.getValue());
        }

        return list;
    }

    @Override
    public JsonElement serialize(Collection<?> src, Type typeOfSrc, JsonSerializationContext context) {
        JsonArray array = new JsonArray();

        for (Object item : src) {
            JsonElement serializedValue = context.serialize(new PropertyValue(item), PropertyValue.class);
            array.add(serializedValue);
        }

        return array;
    }
}