org.ff4j.elastic.FeatureConverter.java Source code

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Here is the source code for org.ff4j.elastic.FeatureConverter.java

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package org.ff4j.elastic;

/*
 * #%L
 * ff4j-store-elastic
 * %%
 * Copyright (C) 2013 - 2016 FF4J
 * %%
 * 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.
 * #L%
 */

import java.lang.reflect.Type;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.ff4j.core.Feature;
import org.ff4j.property.Property;
import org.ff4j.property.util.PropertyFactory;
import org.ff4j.utils.MappingUtil;

import com.google.gson.Gson;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.internal.LinkedTreeMap;
import com.google.gson.reflect.TypeToken;

/**
 * @author <a href="mailto:andre.blaszczyk@gmail.com">Andre Blaszczyk</a>
 *
 *         Custom GSon converter is required to avoid exceptions.
 */
public class FeatureConverter implements JsonSerializer<Feature>, JsonDeserializer<Feature> {

    private Gson gson = new Gson();

    @Override
    public JsonElement serialize(Feature feature, Type srcType, JsonSerializationContext context) {
        return gson.fromJson(feature.toJson(), JsonElement.class);
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    public Feature deserialize(JsonElement json, Type type, JsonDeserializationContext context) {

        String uid = json.getAsJsonObject().get("uid").getAsString();

        Feature feature = new Feature(uid);

        // Property "enable"
        JsonElement enable = json.getAsJsonObject().get("enable");
        if (enable != null) {
            feature.setEnable(enable.getAsBoolean());
        }

        // Description
        JsonElement description = json.getAsJsonObject().get("description");
        if (description != null) {
            feature.setDescription(description.getAsString());
        }

        // Group
        JsonElement group = json.getAsJsonObject().get("group");
        if (group != null) {
            feature.setGroup(group.getAsString());
        }

        // Permissions
        JsonElement permissions = json.getAsJsonObject().get("permissions");
        if (permissions != null) {
            Set<String> auths = gson.fromJson(permissions, new TypeToken<HashSet<String>>() {
            }.getType());
            feature.setPermissions(auths);
        }

        // Flipping strategy
        JsonElement flippingStrategy = json.getAsJsonObject().get("flippingStrategy");
        if (flippingStrategy != null && !flippingStrategy.isJsonNull()) {
            Map<String, ?> flippingStrategyParameters = gson.fromJson(flippingStrategy,
                    new TypeToken<HashMap<String, ?>>() {
                    }.getType());
            String flippingStrategyType = flippingStrategyParameters.get("type").toString();
            Map<String, String> initParams = (Map<String, String>) flippingStrategyParameters.get("initParams");
            // Adding flipping strategy
            feature.setFlippingStrategy(
                    MappingUtil.instanceFlippingStrategy(uid, flippingStrategyType, initParams));
        }

        // Custom properties
        JsonElement customProperties = json.getAsJsonObject().get("customProperties");
        if (customProperties != null && !customProperties.isJsonNull()) {
            Map<String, LinkedTreeMap<String, Object>> map = new Gson().fromJson(customProperties,
                    new TypeToken<com.google.gson.internal.LinkedTreeMap<String, LinkedTreeMap<String, Object>>>() {
                    }.getType());
            for (Entry<String, LinkedTreeMap<String, Object>> element : map.entrySet()) {
                LinkedTreeMap<String, Object> propertyValues = element.getValue();
                // Getting values
                String pName = (String) propertyValues.get("name");
                String pType = (String) propertyValues.get("type");
                String pValue = (String) propertyValues.get("value");
                String desc = (String) propertyValues.get("description");
                Object fixedValues = propertyValues.get("fixedValues");
                Set pFixedValues = fixedValues != null ? new HashSet((Collection) fixedValues) : null;
                // Creating property with it
                Property<?> property = PropertyFactory.createProperty(pName, pType, pValue, desc, pFixedValues);
                feature.addProperty(property);
            }
        }

        return feature;
    }
}