src/main/java/com/fasterxml/jackson/databind/ser/impl/UnwrappingBeanSerializer.java

package com.fasterxml.jackson.databind.ser.impl;

import java.io.IOException;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.ser.*;
import com.fasterxml.jackson.databind.ser.std.BeanSerializerBase;

public class UnwrappingBeanSerializer
    extends BeanSerializerBase
{
    /*
    /**********************************************************
    /* Life-cycle: constructors
    /**********************************************************
     */

    /**
     * Constructor used for creating unwrapping instance of a
     * standard <code>BeanSerializer</code>
     */
    public UnwrappingBeanSerializer(BeanSerializerBase src, String prefix) {
        super(src, prefix);
    }

    /*
    /**********************************************************
    /* Life-cycle: factory methods, fluent factories
    /**********************************************************
     */

    @Override
    public JsonSerializer<Object> unwrappingSerializer(String prefix) {
        /* !!! 13-Jan-2011, tatu: do we need to do something here?
         *    Would this affect multi-level unwrapping?
         */
        return this;
    }

    @Override
    public boolean isUnwrappingSerializer() {
        return true; // sure is
    }
    
    /*
    /**********************************************************
    /* JsonSerializer implementation that differs between impls
    /**********************************************************
     */

    /**
     * Main serialization method that will delegate actual output to
     * configured
     * {@link BeanPropertyWriter} instances.
     */
    @Override
    public final void serialize(Object bean, JsonGenerator jgen, SerializerProvider provider)
        throws IOException, JsonGenerationException
    {
        if (_propertyFilterId != null) {
            serializeFieldsFiltered(bean, jgen, provider);
        } else {
            serializeFields(bean, jgen, provider);
        }
    }

    /*
    /**********************************************************
    /* Standard methods
    /**********************************************************
     */

    @Override public String toString() {
        return "UnwrappingBeanSerializer for "+handledType().getName();
    }
}