JacksonJsonUtils.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package org.openspcoop2.utils.json;

import java.util.TimeZone;

import org.openspcoop2.utils.jaxrs.JacksonJsonProviderCustomized;

import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;

/** 
 * JSONUtils
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class JacksonJsonUtils extends AbstractUtils {
    
    
    private static TimeZone timeZone = TimeZone.getDefault();
    public static TimeZone getTimeZone() {
        return timeZone;
    }
    public static void setTimeZone(TimeZone timeZoneParam) {
        timeZone = timeZoneParam;
    }
    public static String getTimeZoneId() {
        return timeZone.getID();
    }
    public static void setTimeZoneById(String timeZoneId) {
        timeZone = TimeZone.getTimeZone(timeZoneId);
    }
    
    private static JacksonJsonUtils jsonUtils = null;
    private static JacksonJsonUtils jsonUtilsPretty = null;
    private static synchronized void init(boolean prettyPrint){
        if(prettyPrint) {
            if(JacksonJsonUtils.jsonUtilsPretty==null){
                JacksonJsonUtils.jsonUtilsPretty = new JacksonJsonUtils(true);
            }
        }
        else {
            if(JacksonJsonUtils.jsonUtils==null){
                JacksonJsonUtils.jsonUtils = new JacksonJsonUtils(false);
            }
        }
    }
    public static JacksonJsonUtils getInstance(){
        return getInstance(false);
    }
    public static JacksonJsonUtils getInstance(boolean prettyPrint){
        if(prettyPrint) {
            if(JacksonJsonUtils.jsonUtilsPretty==null){
                // spotbugs warning 'SING_SINGLETON_GETTER_NOT_SYNCHRONIZED'
                synchronized (JacksonJsonUtils.class) {
                    JacksonJsonUtils.init(true);
                }
            }
            return JacksonJsonUtils.jsonUtilsPretty;
        }
        else {
            if(JacksonJsonUtils.jsonUtils==null){
                // spotbugs warning 'SING_SINGLETON_GETTER_NOT_SYNCHRONIZED'
                synchronized (JacksonJsonUtils.class) {
                    JacksonJsonUtils.init(false);
                }
            }
            return JacksonJsonUtils.jsonUtils;
        }
    }
    

    private static ObjectMapper mapper;
    private static synchronized void initMapper()  {
        if(mapper==null){
            mapper = JacksonJsonProviderCustomized.getObjectMapper(false, timeZone);
            mapper.setSerializationInclusion(Include.NON_NULL);
        }
    }
    public static ObjectMapper getObjectMapper() {
        if(mapper==null){
            initMapper();
        }
        return mapper;
    }
    
    private static ObjectWriter writer;
    private static synchronized void initWriter()  {
        if(mapper==null){
            initMapper();
        }
        if(writer==null){
            writer = mapper.writer();
        }
    }
    public static ObjectWriter getObjectWriter() {
        if(writer==null){
            initWriter();
        }
        return writer;
    }
    
    private static ObjectWriter writerPrettyPrint;
    private static synchronized void initWriterPrettyPrint()  {
        if(mapper==null){
            initMapper();
        }
        if(writerPrettyPrint==null){
            writerPrettyPrint = mapper.writer().withDefaultPrettyPrinter();
        }
    }
    public static ObjectWriter getObjectWriterPrettyPrint() {
        if(writerPrettyPrint==null){
            initWriterPrettyPrint();
        }
        return writerPrettyPrint;
    }
    
    
    
    private JacksonJsonUtils(boolean prettyPrint) {
        super(prettyPrint);
    }
    
    @Override
    protected void _initMapper() {
        initMapper();
    }
    @Override
    protected void _initWriter(boolean prettyPrint) {
        if(prettyPrint) { 
            initWriterPrettyPrint();
        }
        else {
            initWriter();
        }
    }
    
    @Override
    protected ObjectMapper _getObjectMapper() {
        return getObjectMapper();
    }
    @Override
    protected ObjectWriter _getObjectWriter(boolean prettyPrint) {
        if(prettyPrint) { 
            return getObjectWriterPrettyPrint();
        }
        else {
            return getObjectWriter();
        }
    }
    
    
    // IS
    
    public boolean isJson(byte[]jsonBytes){
        return this.isValid(jsonBytes);
    }
    
    public boolean isJson(String jsonString){
        return this.isValid(jsonString);
    }
    
}