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    • com.fasterxml.jackson.module.hibernate.PersistentCollectionSerializer Maven / Gradle / Ivy

    package com.fasterxml.jackson.module.hibernate;

import java.io.IOException;

import org.hibernate.collection.PersistentCollection;

import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.BeanProperty;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.JsonSerializer;
import org.codehaus.jackson.map.ResolvableSerializer;
import org.codehaus.jackson.map.SerializerProvider;
import org.codehaus.jackson.map.TypeSerializer;
import org.codehaus.jackson.type.JavaType;

/**
 * Wrapper serializer used to handle aspects of lazy loading that can be used
 * for Hibernate collection datatypes.
 */
public class PersistentCollectionSerializer
    extends JsonSerializer
    implements ResolvableSerializer
{
    /**
     * Property that has collection value to handle
     */
    protected final BeanProperty _property;

    protected final boolean _forceLazyLoading;
    
    /**
     * This is the nominal type used to locate actual serializer to use
     * for contents, if this collection is to be serialized.
     */
    protected final JavaType _serializationType;

    /**
     * Serializer to which we delegate if serialization is not blocked.
     */
    protected JsonSerializer _serializer;

    /*
    /**********************************************************************
    /* Life cycle
    /**********************************************************************
     */
    
    public PersistentCollectionSerializer(BeanProperty property, JavaType serializationType,
            boolean forceLazyLoading)
    {
        _property = property;
        _serializationType = serializationType;
        _forceLazyLoading = forceLazyLoading;
    }

    /**
     * We need to resolve actual serializer after the fact since Serializers API
     * does not allow callbacks (to avoid infinite loops)
     */
    public void resolve(SerializerProvider provider) throws JsonMappingException
    {
        _serializer = provider.findValueSerializer(_serializationType, _property);
    }
    
    /*
    /**********************************************************************
    /* JsonSerializer impl
    /**********************************************************************
     */
    
    @Override
    public void serialize(PersistentCollection value, JsonGenerator jgen, SerializerProvider provider)
        throws IOException, JsonProcessingException
    {
        // If lazy-loaded, not yet loaded, may serialize as null?
        if (!_forceLazyLoading && !value.wasInitialized()) {
            jgen.writeNull();
            return;
        }
        _serializer.serialize(value, jgen, provider);
    }

    public void serializeWithType(PersistentCollection value, JsonGenerator jgen, SerializerProvider provider,
            TypeSerializer typeSer)
        throws IOException, JsonProcessingException
    {
        if (!_forceLazyLoading && !value.wasInitialized()) {
            jgen.writeNull();
            return;
        }
        _serializer.serializeWithType(value, jgen, provider, typeSer);
    }
}
    
    
    
    

    




    
    
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