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• BeanSerializerFactory.java

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com.fasterxml.jackson.databind.ser.BeanSerializerFactory Maven / Gradle / Ivy

package com.fasterxml.jackson.databind.ser;

import java.util.*;

import com.fasterxml.jackson.annotation.ObjectIdGenerator;
import com.fasterxml.jackson.annotation.ObjectIdGenerators;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.cfg.SerializerFactoryConfig;
import com.fasterxml.jackson.databind.introspect.*;
import com.fasterxml.jackson.databind.jsontype.NamedType;
import com.fasterxml.jackson.databind.jsontype.TypeResolverBuilder;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.impl.FilteredBeanPropertyWriter;
import com.fasterxml.jackson.databind.ser.impl.ObjectIdWriter;
import com.fasterxml.jackson.databind.ser.impl.PropertyBasedObjectIdGenerator;
import com.fasterxml.jackson.databind.ser.std.MapSerializer;
import com.fasterxml.jackson.databind.ser.std.StdDelegatingSerializer;
import com.fasterxml.jackson.databind.type.*;
import com.fasterxml.jackson.databind.util.ArrayBuilders;
import com.fasterxml.jackson.databind.util.ClassUtil;
import com.fasterxml.jackson.databind.util.Converter;

/**
 * Factory class that can provide serializers for any regular Java beans
 * (as defined by "having at least one get method recognizable as bean
 * accessor" -- where {@link Object#getClass} does not count);
 * as well as for "standard" JDK types. Latter is achieved
 * by delegating calls to {@link BasicSerializerFactory} 
 * to find serializers both for "standard" JDK types (and in some cases,
 * sub-classes as is the case for collection classes like
 * {@link java.util.List}s and {@link java.util.Map}s) and bean (value)
 * classes.
 *

 * Note about delegating calls to {@link BasicSerializerFactory}:
 * although it would be nicer to use linear delegation
 * for construction (to essentially dispatch all calls first to the
 * underlying {@link BasicSerializerFactory}; or alternatively after
 * failing to provide bean-based serializer}, there is a problem:
 * priority levels for detecting standard types are mixed. That is,
 * we want to check if a type is a bean after some of "standard" JDK
 * types, but before the rest.
 * As a result, "mixed" delegation used, and calls are NOT done using
 * regular {@link SerializerFactory} interface but rather via
 * direct calls to {@link BasicSerializerFactory}.
 *

 * Finally, since all caching is handled by the serializer provider
 * (not factory) and there is no configurability, this
 * factory is stateless.
 * This means that a global singleton instance can be used.
 */
public class BeanSerializerFactory
    extends BasicSerializerFactory
    implements java.io.Serializable // since 2.1
{
    private static final long serialVersionUID = 1;

    /**
     * Like {@link BasicSerializerFactory}, this factory is stateless, and
     * thus a single shared global (== singleton) instance can be used
     * without thread-safety issues.
     */
    public final static BeanSerializerFactory instance = new BeanSerializerFactory(null);

    /*
    /**********************************************************
    /* Life-cycle: creation, configuration
    /**********************************************************
     */

    /**
     * Constructor for creating instances with specified configuration.
     */
    protected BeanSerializerFactory(SerializerFactoryConfig config)
    {
        super(config);
    }
    
    /**
     * Method used by module registration functionality, to attach additional
     * serializer providers into this serializer factory. This is typically
     * handled by constructing a new instance with additional serializers,
     * to ensure thread-safe access.
     */
    @Override
    public SerializerFactory withConfig(SerializerFactoryConfig config)
    {
        if (_factoryConfig == config) {
            return this;
        }
        /* 22-Nov-2010, tatu: Handling of subtypes is tricky if we do immutable-with-copy-ctor;
         *    and we pretty much have to here either choose between losing subtype instance
         *    when registering additional serializers, or losing serializers.
         *    Instead, let's actually just throw an error if this method is called when subtype
         *    has not properly overridden this method; this to indicate problem as soon as possible.
         */
        if (getClass() != BeanSerializerFactory.class) {
            throw new IllegalStateException("Subtype of BeanSerializerFactory ("+getClass().getName()
                    +") has not properly overridden method 'withAdditionalSerializers': can not instantiate subtype with "
                    +"additional serializer definitions");
        }
        return new BeanSerializerFactory(config);
    }

    @Override
    protected Iterable customSerializers() {
        return _factoryConfig.serializers();
    }
    
    /*
    /**********************************************************
    /* SerializerFactory impl
    /**********************************************************
     */

    /**
     * Main serializer constructor method. We will have to be careful
     * with respect to ordering of various method calls: essentially
     * we want to reliably figure out which classes are standard types,
     * and which are beans. The problem is that some bean Classes may
     * implement standard interfaces (say, {@link java.lang.Iterable}.
     *

     * Note: sub-classes may choose to complete replace implementation,
     * if they want to alter priority of serializer lookups.
     */
    @Override
    @SuppressWarnings("unchecked")
    public JsonSerializer