cc.kave.commons.utils.json.EnumDeSerializer.java Source code

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Here is the source code for cc.kave.commons.utils.json.EnumDeSerializer.java

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/**
 * Copyright 2016 Technische Universitt Darmstadt
 * 
 * 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 cc.kave.commons.utils.json;

import java.lang.reflect.Type;

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;

public class EnumDeSerializer<T extends Enum<T>> implements JsonSerializer<T>, JsonDeserializer<T> {

    private T[] values;

    private EnumDeSerializer(T[] values) {
        this.values = values;
    }

    public static <U extends Enum<U>> EnumDeSerializer<U> create(U[] values) {
        return new EnumDeSerializer<>(values);
    }

    public JsonElement serialize(T src, Type typeOfSrc, JsonSerializationContext context) {
        int index = -1;
        for (int i = 0; i < values.length; i++) {
            if (values[i] == src) {
                index = i;
            }
        }

        return new JsonPrimitive(index);
    }

    public T deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException {
        int index = json.getAsInt();
        if (index >= 0 && index < values.length) {
            return values[index];
        }
        return values[0];
    }
}