JSonDeserializer.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.serialization;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import org.openspcoop2.utils.CopyCharStream;
import org.openspcoop2.utils.CopyStream;
import org.openspcoop2.utils.UtilsException;
import org.openspcoop2.utils.resources.ClassLoaderUtilities;

import net.sf.ezmorph.MorpherRegistry;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import net.sf.json.util.JSONUtils;

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

public class JSonDeserializer implements IDeserializer{

    
    private JsonConfig jsonConfig;
    private List<String> morpherPackage = new ArrayList<>();
    private boolean throwExceptionMorpherFailed = true;
    
    public JSonDeserializer() {
        this(new SerializationConfig());
    }
    
    public JSonDeserializer(SerializationConfig config) {
        JsonConfig jsonConfig = new JsonConfig();
        if(config.getExcludes()!=null){
            //jsonConfig.setExcludes(excludes); non funziona l'exclude durante la deserializzazione, uso un filtro
            jsonConfig.setJavaPropertyFilter(new ExclusionPropertyFilter(config.getExcludes()));
        } 
        this.jsonConfig = jsonConfig;
        this.addMorpherPackage("org.openspcoop2");
    }
    
    public void addMorpherPackage(String p){
        this.morpherPackage.add(p);
    }
    
    public boolean isThrowExceptionMorpherFailed() {
        return this.throwExceptionMorpherFailed;
    }
    public void setThrowExceptionMorpherFailed(boolean throwExceptionMorpherFailed) {
        this.throwExceptionMorpherFailed = throwExceptionMorpherFailed;
    }
    
    @Override
    public Object getObject(String s, Class<?> classType) throws IOException{
        return getObject(s, classType, null);
    }
    public Object getListObject(String s, Class<?> listType, Class<?> elementsTypes) throws IOException{
        Object o = getObject(s, listType, elementsTypes);
        if( !(o instanceof List) ){
            throw new IOException("Object de-serializzato di tipo non java.util.List: "+o.getClass().getName());
        }
        return o;
    }
    public Object getSetObject(String s, Class<?> setType, Class<?> elementsTypes) throws IOException{
        Object o = getObject(s, setType, elementsTypes);
        if( !(o instanceof Set) ){
            throw new IOException("Object de-serializzato di tipo non java.util.Set: "+o.getClass().getName());
        }
        return o;
    }
    private Object getObject(String s, Class<?> classType, Class<?> elementsTypes ) throws IOException{
        try{
            return readObject_engine(s, classType, elementsTypes);  
        }catch(Exception e){
            throw new IOException("Trasformazione in oggetto non riuscita: "+e.getMessage(),e);
        }
    }
    
    
    
    @Override
    public Object readObject(InputStream is, Class<?> classType) throws IOException{
        return readObject(is, classType, null);
    }
    public Object readListObject(InputStream is, Class<?> listType, Class<?> elementsTypes) throws IOException{
        Object o = readObject(is, listType, elementsTypes);
        if( !(o instanceof List) ){
            throw new IOException("Object de-serializzato di tipo non java.util.List: "+o.getClass().getName());
        }
        return o;
    }
    public Object readSetObject(InputStream is, Class<?> setType, Class<?> elementsTypes) throws IOException{
        Object o = readObject(is, setType, elementsTypes);
        if( !(o instanceof Set) ){
            throw new IOException("Object de-serializzato di tipo non java.util.Set: "+o.getClass().getName());
        }
        return o;
    }
    private Object readObject(InputStream is, Class<?> classType, Class<?> elementsTypes) throws IOException{
        try{
            ByteArrayOutputStream bout = new ByteArrayOutputStream();
//          byte [] reads = new byte[Utilities.DIMENSIONE_BUFFER];
//          int letti = 0;
//          while( (letti=is.read(reads)) != -1 ){
//              bout.write(reads, 0, letti);
//          }
            CopyStream.copy(is, bout);
            bout.flush();
            bout.close();
            
            return readObject_engine(bout.toString(), classType, elementsTypes);    
            
        }catch(Exception e){
            throw new IOException("Trasformazione in oggetto non riuscita: "+e.getMessage(),e);
        }
    }
    
    
    
    @Override
    public Object readObject(Reader reader, Class<?> classType) throws IOException{
        return readObject(reader, classType, null);
    }
    public Object readListObject(Reader reader, Class<?> listType, Class<?> elementsTypes) throws IOException{
        Object o = readObject(reader, listType, elementsTypes);
        if( !(o instanceof List) ){
            throw new IOException("Object de-serializzato di tipo non java.util.List: "+o.getClass().getName());
        }
        return o;
    }
    public Object readSetObject(Reader reader, Class<?> setType, Class<?> elementsTypes) throws IOException{
        Object o = readObject(reader, setType, elementsTypes);
        if( !(o instanceof Set) ){
            throw new IOException("Object de-serializzato di tipo non java.util.Set: "+o.getClass().getName());
        }
        return o;
    }
    private Object readObject(Reader reader, Class<?> classType, Class<?> elementsTypes) throws IOException{
        try{
//          char [] reads = new char[Utilities.DIMENSIONE_BUFFER];
//          int letti = 0;
//          StringBuilder bf = new StringBuilder();
//          while( (letti=reader.read(reads)) != -1 ){
//              bf.append(reads, 0, letti);
//          }
//          
            StringWriter writer = new StringWriter();
            CopyCharStream.copy(reader, writer);
                        
            return readObject_engine(writer.toString(), classType, elementsTypes);  
            
        }catch(Exception e){
            throw new IOException("Trasformazione in oggetto non riuscita: "+e.getMessage(),e);
        }
    }

    
    
    private Object readObject_engine(String object,Class<?> classType, Class<?> elementsTypes) throws Exception{
        
        boolean list = false;
        try{
            classType.asSubclass(List.class);
            list = true;
        }catch(ClassCastException cc){}
        
        boolean set = false;
        try{
            classType.asSubclass(Set.class);
            set = true;
        }catch(ClassCastException cc){}
        
        //System.out.println("CLASS: "+classType.getName() +" ENUM["+classType.isEnum()+"] ARRAY["+classType.isArray()+"] LISTCAST["+list+"] SETCAST["+set+"]");
        
        if(classType.isEnum()){
            JSONArray jsonArray = JSONArray.fromObject( object ); 
            Object en = jsonArray.toArray()[0];
            //System.out.println("TIPO ["+en.getClass().getName()+"]");
            Object [] o = classType.getEnumConstants();
            Class<?> enumeration = o[0].getClass();
            //System.out.println("OO ["+enumeration+"]");
            Method method = enumeration.getMethod("valueOf", String.class);
            Object value = method.invoke(enumeration, en);
            return value;
        }
        
        else if(classType.isArray()){

            JSONArray jsonArray = JSONArray.fromObject( object ); 
            Object[] oarray = jsonArray.toArray();
            Object[] array = new Object[oarray.length];
            for(int i=0; i<oarray.length;i++){
                JSONObject json = (JSONObject) oarray[i];
                array[i] =  fromJSONObjectToOriginalObject(classType.getComponentType(), json);
            }
            return array;
        }
        
        else if(list){
            
            if(elementsTypes==null){
                throw new Exception("elementsTypes non definito, e' obbligatorio per il tipo che si desidera de-serializzare: "+classType.getName());
            }
            
            JSONArray jsonArray = JSONArray.fromObject( object ); 
            Object[] oarray = jsonArray.toArray();
            @SuppressWarnings("unchecked")
            List<Object> listReturn = (List<Object>) ClassLoaderUtilities.newInstance(classType);       
            for(int i=0; i<oarray.length;i++){
                JSONObject json = (JSONObject) oarray[i];
                Object o =  fromJSONObjectToOriginalObject(elementsTypes, json);
                listReturn.add(o);
            }
            return listReturn;
        }
        
        else if(set){
            
            if(elementsTypes==null){
                throw new Exception("elementsTypes non definito, e' obbligatorio per il tipo che si desidera de-serializzare: "+classType.getName());
            }
            
            JSONArray jsonArray = JSONArray.fromObject( object ); 
            Object[] oarray = jsonArray.toArray();
            @SuppressWarnings("unchecked")
            Set<Object> setReturn = (Set<Object>) ClassLoaderUtilities.newInstance(classType);      
            for(int i=0; i<oarray.length;i++){
                JSONObject json = (JSONObject) oarray[i];
                Object o =  fromJSONObjectToOriginalObject(elementsTypes, json);
                setReturn.add(o);
            }
            return setReturn;
        }
        
        else{
            JSONObject jsonObject = JSONObject.fromObject( object );  
            return fromJSONObjectToOriginalObject(classType, jsonObject);
        }
    }
    
    private Object fromJSONObjectToOriginalObject(Class<?> classType, JSONObject jsonObject) throws UtilsException{
        this.jsonConfig.setRootClass(classType);
        
        MorpherRegistry morpherRegistry = JSONUtils.getMorpherRegistry();
        org.openspcoop2.utils.serialization.Utilities.registerMorpher(classType, morpherRegistry, new ArrayList<>(), this.morpherPackage);
        
        Object o = JSONObject.toBean( jsonObject, this.jsonConfig );

        org.openspcoop2.utils.serialization.Utilities.morpher(o, morpherRegistry, this.morpherPackage, this.throwExceptionMorpherFailed);
        
        return o;
    }
    
}