JsonJacksonSerializer.java

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 * 
 * 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
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 *
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 * 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.
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 *
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package org.openspcoop2.utils.serialization;

import java.io.OutputStream;
import java.io.Writer;
import java.util.HashSet;

import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.AnnotationIntrospectorPair;
import com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector;
import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.fasterxml.jackson.module.jaxb.JaxbAnnotationIntrospector;



/** 
 * Contiene utility per effettuare la serializzazione di un oggetto
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */

public class JsonJacksonSerializer implements ISerializer {


    private static final String DEFAULT = "__default";
    private ObjectWriter writer;

    
    public JsonJacksonSerializer() {
        this(new SerializationConfig());
    }
    
    public JsonJacksonSerializer(SerializationConfig config) {
        ObjectMapper mapper = new ObjectMapper().setAnnotationIntrospector(
                new AnnotationIntrospectorPair(
                        new JacksonAnnotationIntrospector() {

                            private static final long serialVersionUID = 1L;

                            @Override
                            public String findFilterId(Annotated a) {
                                return DEFAULT;
                            }

                        }, new JaxbAnnotationIntrospector(TypeFactory.defaultInstance())
                        )
                );

        if(config.isSerializeEnumAsString())
            mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);

        mapper.setDateFormat(config.getDf());       
        
        if(config.getIgnoreNullValues() == null || config.getIgnoreNullValues())
            mapper.setSerializationInclusion(Include.NON_NULL);
        
        SimpleFilterProvider filters = new SimpleFilterProvider();
        if( (
                config.getFilter() != null 
                && 
                ( (config.getFilter().sizeFiltersByName()>0) || (config.getFilter().sizeFiltersByValue()>0))
            )
                || 
            config.getExcludes() != null) {
            filters = filters.addFilter(DEFAULT, new JacksonSimpleBeanPropertyFilter(config, new JsonJacksonSerializer()));
        } else if(config.getIncludes()!=null) {
            HashSet<String> hashSet = new HashSet<String>();
            hashSet.addAll(config.getIncludes());
            filters = filters.addFilter(DEFAULT, SimpleBeanPropertyFilter.filterOutAllExcept(hashSet));
        }
        
        filters = filters.setFailOnUnknownId(false);

        mapper.setFilterProvider(filters);
        if(config.isPrettyPrint()) {
            this.writer = mapper.writer().withDefaultPrettyPrinter();
        }
        else {
            this.writer = mapper.writer();
        }
    }

    @Override
    public String getObject(Object o) throws IOException{
        try{
            return this.writer.writeValueAsString(o);
        }catch(Exception e){
            throw new IOException(e.getMessage(),e);
        }
    }

    @Override
    public void writeObject(Object o,OutputStream out) throws IOException{
        try{
            this.writer.writeValue(out, o);
        }catch(Exception e){
            throw new IOException(e.getMessage(),e);
        }
    }

    @Override
    public void writeObject(Object o,Writer out) throws IOException{
        try{
            this.writer.writeValue(out, o);
        }catch(Exception e){
            throw new IOException(e.getMessage(),e);
        }
    }

}