com.jd.survey.service.util.JsonHelperService.java Source code

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Here is the source code for com.jd.survey.service.util.JsonHelperService.java

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/*Copyright (C) 2014  JD Software, Inc.
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
    
This program 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 Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package com.jd.survey.service.util;

import java.util.SortedSet;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.Hibernate;
import org.hibernate.proxy.HibernateProxy;
import org.springframework.stereotype.Service;

import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.jd.survey.domain.settings.Question;
import com.jd.survey.domain.settings.QuestionColumnLabel;
import com.jd.survey.domain.settings.QuestionOption;
import com.jd.survey.domain.settings.QuestionRowLabel;
import com.jd.survey.domain.settings.SurveyDefinition;
import com.jd.survey.domain.settings.SurveyDefinitionPage;
import com.jd.survey.util.HibernateProxySerializer;

@Service("JsonHelperService")
public class JsonHelperService {
    private static final Log log = LogFactory.getLog(JsonHelperService.class);

    public String serializeSurveyDefinition(SurveyDefinition surveyDefinition) {
        try {
            GsonBuilder gsonBuilder = new GsonBuilder();
            //set up the fields to skip in the serialization
            gsonBuilder = gsonBuilder.setExclusionStrategies(new ExclusionStrategy() {
                public boolean shouldSkipClass(Class<?> clazz) {
                    return false;
                }

                @Override
                public boolean shouldSkipField(FieldAttributes f) {
                    boolean skip = (f.getDeclaringClass() == SurveyDefinition.class && f.getName().equals("id"))
                            || (f.getDeclaringClass() == SurveyDefinition.class && f.getName().equals("version"))
                            || (f.getDeclaringClass() == SurveyDefinition.class && f.getName().equals("department"))
                            || (f.getDeclaringClass() == SurveyDefinition.class && f.getName().equals("users"))
                            || (f.getDeclaringClass() == SurveyDefinitionPage.class && f.getName().equals("id"))
                            || (f.getDeclaringClass() == SurveyDefinitionPage.class
                                    && f.getName().equals("surveyDefinition"))
                            || (f.getDeclaringClass() == Question.class && f.getName().equals("id"))
                            || (f.getDeclaringClass() == Question.class && f.getName().equals("version"))
                            || (f.getDeclaringClass() == Question.class && f.getName().equals("page"))
                            || (f.getDeclaringClass() == Question.class && f.getName().equals("optionsList"))
                            || (f.getDeclaringClass() == Question.class && f.getName().equals("rowLabelsList"))
                            || (f.getDeclaringClass() == Question.class && f.getName().equals("columnLabelsList"))
                            || (f.getDeclaringClass() == QuestionOption.class && f.getName().equals("id"))
                            || (f.getDeclaringClass() == QuestionOption.class && f.getName().equals("version"))
                            || (f.getDeclaringClass() == QuestionOption.class && f.getName().equals("question"))
                            || (f.getDeclaringClass() == QuestionRowLabel.class && f.getName().equals("id"))
                            || (f.getDeclaringClass() == QuestionRowLabel.class && f.getName().equals("version"))
                            || (f.getDeclaringClass() == QuestionRowLabel.class && f.getName().equals("question"))
                            || (f.getDeclaringClass() == QuestionColumnLabel.class && f.getName().equals("id"))
                            || (f.getDeclaringClass() == QuestionColumnLabel.class && f.getName().equals("version"))
                            || (f.getDeclaringClass() == QuestionColumnLabel.class
                                    && f.getName().equals("question"));
                    return skip;
                }

            });

            //de-proxy the object
            gsonBuilder.registerTypeHierarchyAdapter(HibernateProxy.class, new HibernateProxySerializer());
            Hibernate.initialize(surveyDefinition);
            if (surveyDefinition instanceof HibernateProxy) {
                surveyDefinition = (SurveyDefinition) ((HibernateProxy) surveyDefinition)
                        .getHibernateLazyInitializer().getImplementation();
            }
            Gson gson = gsonBuilder.serializeNulls().create();
            return gson.toJson(surveyDefinition);

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw (new RuntimeException(e));
        }

    }

    public SurveyDefinition deSerializeSurveyDefinition(String jsonString) {
        try {
            Gson gson = new Gson();
            SurveyDefinition surveyDefinition = (SurveyDefinition) gson.fromJson(jsonString,
                    SurveyDefinition.class);
            return surveyDefinition;
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw (new RuntimeException(e));
        }

    }

}