ru.caramel.juniperbot.core.utils.GsonUtils.java Source code

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Here is the source code for ru.caramel.juniperbot.core.utils.GsonUtils.java

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/*
 * This file is part of JuniperBotJ.
 *
 * JuniperBotJ is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
    
 * JuniperBotJ is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
    
 * You should have received a copy of the GNU General Public License
 * along with JuniperBotJ. If not, see <http://www.gnu.org/licenses/>.
 */
package ru.caramel.juniperbot.core.utils;

import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import java.lang.reflect.Field;

public final class GsonUtils {

    private GsonUtils() {
        // private
    }

    public static Gson create() {
        GsonBuilder builder = new GsonBuilder();
        builder.addDeserializationExclusionStrategy(new SuperclassExclusionStrategy());
        builder.addSerializationExclusionStrategy(new SuperclassExclusionStrategy());
        return builder.create();
    }

    public static class SuperclassExclusionStrategy implements ExclusionStrategy {
        public boolean shouldSkipClass(Class<?> arg0) {
            return false;
        }

        public boolean shouldSkipField(FieldAttributes fieldAttributes) {
            String fieldName = fieldAttributes.getName();
            Class<?> theClass = fieldAttributes.getDeclaringClass();

            return isFieldInSuperclass(theClass, fieldName);
        }

        private boolean isFieldInSuperclass(Class<?> subclass, String fieldName) {
            Class<?> superclass = subclass.getSuperclass();
            Field field;

            while (superclass != null) {
                field = getField(superclass, fieldName);

                if (field != null)
                    return true;

                superclass = superclass.getSuperclass();
            }

            return false;
        }

        private Field getField(Class<?> theClass, String fieldName) {
            try {
                return theClass.getDeclaredField(fieldName);
            } catch (Exception e) {
                return null;
            }
        }
    }
}