package com.fasterxml.jackson.databind.ser;

import java.util.*;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonIncludeProperties;
import com.fasterxml.jackson.annotation.ObjectIdGenerator;
import com.fasterxml.jackson.annotation.ObjectIdGenerators;
import com.fasterxml.jackson.annotation.JsonTypeInfo.As;

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.impl.UnsupportedTypeSerializer;
import com.fasterxml.jackson.databind.ser.std.MapSerializer;
import com.fasterxml.jackson.databind.ser.std.StdDelegatingSerializer;
import com.fasterxml.jackson.databind.type.ReferenceType;
import com.fasterxml.jackson.databind.util.BeanUtil;
import com.fasterxml.jackson.databind.util.ClassUtil;
import com.fasterxml.jackson.databind.util.Converter;
import com.fasterxml.jackson.databind.util.IgnorePropertiesUtil;

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 Object.getClass does not count); as well as for "standard" JDK types. Latter is achieved by delegating calls to BasicSerializerFactory to find serializers both for "standard" JDK types (and in some cases, sub-classes as is the case for collection classes like Lists and Maps) and bean (value) classes. 
 Note about delegating calls to BasicSerializerFactory: although it would be nicer to use linear delegation for construction (to essentially dispatch all calls first to the underlying 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 SerializerFactory interface but rather via direct calls to 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.
/**
 * 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.
 *<p>
 * 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}.
 *<p>
 * 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 BasicSerializerFactory, this factory is stateless, and thus a single shared global (== singleton) instance can be used without thread-safety issues. /**
     * 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.
/**
     * 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.
/**
     * 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': cannot instantiate subtype with "
                    +"additional serializer definitions");
        }
        return new BeanSerializerFactory(config);
    }

    @Override
    protected Iterable<Serializers> 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, Iterable. 

Note: sub-classes may choose to complete replace implementation,
if they want to alter priority of serializer lookups.
/**
     * 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}.
     *<p>
     * Note: sub-classes may choose to complete replace implementation,
     * if they want to alter priority of serializer lookups.
     */
    @Override
    @SuppressWarnings("unchecked")
    public JsonSerializer<Object> createSerializer(SerializerProvider prov,
            JavaType origType)
        throws JsonMappingException
    {
        // Very first thing, let's check if there is explicit serializer annotation:
        final SerializationConfig config = prov.getConfig();
        BeanDescription beanDesc = config.introspect(origType);
        JsonSerializer<?> ser = findSerializerFromAnnotation(prov, beanDesc.getClassInfo());
        if (ser != null) {
            return (JsonSerializer<Object>) ser;
        }
        boolean staticTyping;
        // Next: we may have annotations that further indicate actual type to use (a super type)
        final AnnotationIntrospector intr = config.getAnnotationIntrospector();
        JavaType type;

        if (intr == null) {
            type = origType;
        } else {
            try {
                type = intr.refineSerializationType(config, beanDesc.getClassInfo(), origType);
            } catch (JsonMappingException e) {
                return prov.reportBadTypeDefinition(beanDesc, e.getMessage());
            }
        }
        if (type == origType) { // no changes, won't force static typing
            staticTyping = false;
        } else { // changes; assume static typing; plus, need to re-introspect if class differs
            staticTyping = true;
            if (!type.hasRawClass(origType.getRawClass())) {
                beanDesc = config.introspect(type);
            }
        }
        // Slight detour: do we have a Converter to consider?
        Converter<Object,Object> conv = beanDesc.findSerializationConverter();
        if (conv == null) { // no, simple
            return (JsonSerializer<Object>) _createSerializer2(prov, type, beanDesc, staticTyping);
        }
        JavaType delegateType = conv.getOutputType(prov.getTypeFactory());
        
        // One more twist, as per [databind#288]; probably need to get new BeanDesc
        if (!delegateType.hasRawClass(type.getRawClass())) {
            beanDesc = config.introspect(delegateType);
            // [#359]: explicitly check (again) for @JsonSerializer...
            ser = findSerializerFromAnnotation(prov, beanDesc.getClassInfo());
        }
        // [databind#731]: Should skip if nominally java.lang.Object
        if (ser == null && !delegateType.isJavaLangObject()) {
            ser = _createSerializer2(prov, delegateType, beanDesc, true);
        }
        return new StdDelegatingSerializer(conv, delegateType, ser);
    }

    protected JsonSerializer<?> _createSerializer2(SerializerProvider prov,
            JavaType type, BeanDescription beanDesc, boolean staticTyping)
        throws JsonMappingException
    {
        JsonSerializer<?> ser = null;
        final SerializationConfig config = prov.getConfig();
        
        // Container types differ from non-container types
        // (note: called method checks for module-provided serializers)
        if (type.isContainerType()) {
            if (!staticTyping) {
                staticTyping = usesStaticTyping(config, beanDesc, null);
            }
            // 03-Aug-2012, tatu: As per [databind#40], may require POJO serializer...
            ser =  buildContainerSerializer(prov, type, beanDesc, staticTyping);
            // Will return right away, since called method does post-processing:
            if (ser != null) {
                return ser;
            }
        } else {
            if (type.isReferenceType()) {
                ser = findReferenceSerializer(prov, (ReferenceType) type, beanDesc, staticTyping);
            } else {
                // Modules may provide serializers of POJO types:
                for (Serializers serializers : customSerializers()) {
                    ser = serializers.findSerializer(config, type, beanDesc);
                    if (ser != null) {
                        break;
                    }
                }
            }
            // 25-Jun-2015, tatu: Then JsonSerializable, @JsonValue etc. NOTE! Prior to 2.6,
            //    this call was BEFORE custom serializer lookup, which was wrong.
            if (ser == null) {
                ser = findSerializerByAnnotations(prov, type, beanDesc);
            }
        }
        
        if (ser == null) {
            // Otherwise, we will check "primary types"; both marker types that
            // indicate specific handling (JsonSerializable), or main types that have
            // precedence over container types
            ser = findSerializerByLookup(type, config, beanDesc, staticTyping);
            if (ser == null) {
                ser = findSerializerByPrimaryType(prov, type, beanDesc, staticTyping);
                if (ser == null) {
                    // And this is where this class comes in: if type is not a
                    // known "primary JDK type", perhaps it's a bean? We can still
                    // get a null, if we can't find a single suitable bean property.
                    ser = findBeanOrAddOnSerializer(prov, type, beanDesc, staticTyping);
                    // 18-Sep-2014, tatu: Actually, as per [jackson-databind#539], need to get
                    //   'unknown' serializer assigned earlier, here, so that it gets properly
                    //   post-processed
                    if (ser == null) {
                        ser = prov.getUnknownTypeSerializer(beanDesc.getBeanClass());
                    }
                }
            }
        }
        if (ser != null) {
            // [databind#120]: Allow post-processing
            if (_factoryConfig.hasSerializerModifiers()) {
                for (BeanSerializerModifier mod : _factoryConfig.serializerModifiers()) {
                    ser = mod.modifySerializer(config, beanDesc, ser);
                }
            }
        }
        return ser;
    }
    
    /*
    /**********************************************************
    /* Other public methods that are not part of
    /* JsonSerializerFactory API
    /**********************************************************
     */

    @Deprecated // since 2.10
    public JsonSerializer<Object> findBeanSerializer(SerializerProvider prov, JavaType type,
            BeanDescription beanDesc)
        throws JsonMappingException
    {
        return findBeanOrAddOnSerializer(prov, type, beanDesc, prov.isEnabled(MapperFeature.USE_STATIC_TYPING));
    }

    
Method that will try to construct a BeanSerializer for given class if at least one property is found, OR, if not, one of add-on types. 

NOTE: behavior changed a bit
/**
     * Method that will try to construct a {@link BeanSerializer} for
     * given class if at least one property is found, OR, if not,
     * one of add-on types.
     *<p>
     * NOTE: behavior changed a bit
     */
    public JsonSerializer<Object> findBeanOrAddOnSerializer(SerializerProvider prov, JavaType type,
            BeanDescription beanDesc, boolean staticTyping)
        throws JsonMappingException
    {
        // First things first: we know some types are not beans...
        if (!isPotentialBeanType(type.getRawClass())) {
            // 03-Aug-2012, tatu: Except we do need to allow serializers for Enums,
            //   as per [databind#24], [databind#2576]
            if (!ClassUtil.isEnumType(type.getRawClass())) {
                return null;
            }
        }
        return constructBeanOrAddOnSerializer(prov, type, beanDesc, staticTyping);
    }

    
Method called to create a type information serializer for values of given
non-container property
if one is needed. If not needed (no polymorphic handling configured), should
return null.
Params:
baseType – Declared type to use as the base type for type information serializer
Returns:
Type serializer to use for property values, if one is needed; null if not./**
     * Method called to create a type information serializer for values of given
     * non-container property
     * if one is needed. If not needed (no polymorphic handling configured), should
     * return null.
     *
     * @param baseType Declared type to use as the base type for type information serializer
     * 
     * @return Type serializer to use for property values, if one is needed; null if not.
     */
    public TypeSerializer findPropertyTypeSerializer(JavaType baseType,
            SerializationConfig config, AnnotatedMember accessor)
        throws JsonMappingException
    {
        AnnotationIntrospector ai = config.getAnnotationIntrospector();
        TypeResolverBuilder<?> b = ai.findPropertyTypeResolver(config, accessor, baseType);        
        TypeSerializer typeSer;

        // Defaulting: if no annotations on member, check value class
        if (b == null) {
            typeSer = createTypeSerializer(config, baseType);
        } else {
            Collection<NamedType> subtypes = config.getSubtypeResolver().collectAndResolveSubtypesByClass(
                    config, accessor, baseType);
            typeSer = b.buildTypeSerializer(config, baseType, subtypes);
        }
        return typeSer;
    }

    
Method called to create a type information serializer for values of given
container property
if one is needed. If not needed (no polymorphic handling configured), should
return null.
Params:
containerType – Declared type of the container to use as the base type for type information serializer
Returns:
Type serializer to use for property value contents, if one is needed; null if not./**
     * Method called to create a type information serializer for values of given
     * container property
     * if one is needed. If not needed (no polymorphic handling configured), should
     * return null.
     *
     * @param containerType Declared type of the container to use as the base type for type information serializer
     * 
     * @return Type serializer to use for property value contents, if one is needed; null if not.
     */    
    public TypeSerializer findPropertyContentTypeSerializer(JavaType containerType,
            SerializationConfig config, AnnotatedMember accessor)
        throws JsonMappingException
    {
        JavaType contentType = containerType.getContentType();
        AnnotationIntrospector ai = config.getAnnotationIntrospector();
        TypeResolverBuilder<?> b = ai.findPropertyContentTypeResolver(config, accessor, containerType);        
        TypeSerializer typeSer;

        // Defaulting: if no annotations on member, check value class
        if (b == null) {
            typeSer = createTypeSerializer(config, contentType);
        } else {
            Collection<NamedType> subtypes = config.getSubtypeResolver().collectAndResolveSubtypesByClass(config,
                    accessor, contentType);
            typeSer = b.buildTypeSerializer(config, contentType, subtypes);
        }
        return typeSer;
    }

    /*
    /**********************************************************
    /* Overridable non-public factory methods
    /**********************************************************
     */

    @Deprecated // since 2.10
    protected JsonSerializer<Object> constructBeanSerializer(SerializerProvider prov,
            BeanDescription beanDesc)
        throws JsonMappingException
    {
        return constructBeanOrAddOnSerializer(prov, beanDesc.getType(), beanDesc, prov.isEnabled(MapperFeature.USE_STATIC_TYPING));
    }

    
Method called to construct serializer for serializing specified bean type if
(but only if, as of 2.10), at least one property is found.
Since:
2.10/**
     * Method called to construct serializer for serializing specified bean type if
     * (but only if, as of 2.10), at least one property is found.
     * 
     * @since 2.10
     */
    @SuppressWarnings("unchecked")
    protected JsonSerializer<Object> constructBeanOrAddOnSerializer(SerializerProvider prov,
            JavaType type, BeanDescription beanDesc, boolean staticTyping)
        throws JsonMappingException
    {
        // 13-Oct-2010, tatu: quick sanity check: never try to create bean serializer for plain Object
        // 05-Jul-2012, tatu: ... but we should be able to just return "unknown type" serializer, right?
        if (beanDesc.getBeanClass() == Object.class) {
            return prov.getUnknownTypeSerializer(Object.class);
//            throw new IllegalArgumentException("Cannot create bean serializer for Object.class");
        }

        JsonSerializer<?> ser = _findUnsupportedTypeSerializer(prov, type, beanDesc);
        if (ser != null) {
            return (JsonSerializer<Object>) ser;
        }

        final SerializationConfig config = prov.getConfig();
        BeanSerializerBuilder builder = constructBeanSerializerBuilder(beanDesc);
        builder.setConfig(config);

        // First: any detectable (auto-detect, annotations) properties to serialize?
        List<BeanPropertyWriter> props = findBeanProperties(prov, beanDesc, builder);
        if (props == null) {
            props = new ArrayList<BeanPropertyWriter>();
        } else {
            props = removeOverlappingTypeIds(prov, beanDesc, builder, props);
        }
        
        // [databind#638]: Allow injection of "virtual" properties:
        prov.getAnnotationIntrospector().findAndAddVirtualProperties(config, beanDesc.getClassInfo(), props);

        // [JACKSON-440] Need to allow modification bean properties to serialize:
        if (_factoryConfig.hasSerializerModifiers()) {
            for (BeanSerializerModifier mod : _factoryConfig.serializerModifiers()) {
                props = mod.changeProperties(config, beanDesc, props);
            }
        }

        // Any properties to suppress?
        props = filterBeanProperties(config, beanDesc, props);

        // Need to allow reordering of properties to serialize
        if (_factoryConfig.hasSerializerModifiers()) {
            for (BeanSerializerModifier mod : _factoryConfig.serializerModifiers()) {
                props = mod.orderProperties(config, beanDesc, props);
            }
        }

        // And if Object Id is needed, some preparation for that as well: better
        // do before view handling, mostly for the custom id case which needs
        // access to a property
        builder.setObjectIdWriter(constructObjectIdHandler(prov, beanDesc, props));
        
        builder.setProperties(props);
        builder.setFilterId(findFilterId(config, beanDesc));

        AnnotatedMember anyGetter = beanDesc.findAnyGetter();
        if (anyGetter != null) {
            JavaType anyType = anyGetter.getType();
            // copied from BasicSerializerFactory.buildMapSerializer():
            JavaType valueType = anyType.getContentType();
            TypeSerializer typeSer = createTypeSerializer(config, valueType);
            // last 2 nulls; don't know key, value serializers (yet)
            // 23-Feb-2015, tatu: As per [databind#705], need to support custom serializers
            JsonSerializer<?> anySer = findSerializerFromAnnotation(prov, anyGetter);
            if (anySer == null) {
                // TODO: support '@JsonIgnoreProperties' with any setter?
                anySer = MapSerializer.construct(/* ignored props*/ (Set<String>) null,
                        anyType, config.isEnabled(MapperFeature.USE_STATIC_TYPING),
                        typeSer, null, null, /*filterId*/ null);
            }
            // TODO: can we find full PropertyName?
            PropertyName name = PropertyName.construct(anyGetter.getName());
            BeanProperty.Std anyProp = new BeanProperty.Std(name, valueType, null,
                    anyGetter, PropertyMetadata.STD_OPTIONAL);
            builder.setAnyGetter(new AnyGetterWriter(anyProp, anyGetter, anySer));
        }
        // Next: need to gather view information, if any:
        processViews(config, builder);

        // Finally: let interested parties mess with the result bit more...
        if (_factoryConfig.hasSerializerModifiers()) {
            for (BeanSerializerModifier mod : _factoryConfig.serializerModifiers()) {
                builder = mod.updateBuilder(config, beanDesc, builder);
            }
        }

        try {
            ser = builder.build();
        } catch (RuntimeException e) {
            return prov.reportBadTypeDefinition(beanDesc, "Failed to construct BeanSerializer for %s: (%s) %s",
                    beanDesc.getType(), e.getClass().getName(), e.getMessage());
        }
        if (ser == null) { // Means that no properties were found
            // 21-Aug-2020, tatu: Empty Records should be fine tho
            if (type.isRecordType()) {
                return builder.createDummy();
            }

            // 06-Aug-2019, tatu: As per [databind#2390], we need to check for add-ons here,
            //    before considering fallbacks
            ser = (JsonSerializer<Object>) findSerializerByAddonType(config, type, beanDesc, staticTyping);
            if (ser == null) {
                // If we get this far, there were no properties found, so no regular BeanSerializer
                // would be constructed. But, couple of exceptions.
                // First: if there are known annotations, just create 'empty bean' serializer
                if (beanDesc.hasKnownClassAnnotations()) {
                    return builder.createDummy();
                }
            }
        }
        return (JsonSerializer<Object>) ser;
    }

    protected ObjectIdWriter constructObjectIdHandler(SerializerProvider prov,
            BeanDescription beanDesc, List<BeanPropertyWriter> props)
        throws JsonMappingException
    {
        ObjectIdInfo objectIdInfo = beanDesc.getObjectIdInfo();
        if (objectIdInfo == null) {
            return null;
        }
        ObjectIdGenerator<?> gen;
        Class<?> implClass = objectIdInfo.getGeneratorType();

        // Just one special case: Property-based generator is trickier
        if (implClass == ObjectIdGenerators.PropertyGenerator.class) { // most special one, needs extra work
            String propName = objectIdInfo.getPropertyName().getSimpleName();
            BeanPropertyWriter idProp = null;

            for (int i = 0, len = props.size() ;; ++i) {
                if (i == len) {
                    throw new IllegalArgumentException(String.format(
"Invalid Object Id definition for %s: cannot find property with name %s",
ClassUtil.getTypeDescription(beanDesc.getType()), ClassUtil.name(propName)));
                }
                BeanPropertyWriter prop = props.get(i);
                if (propName.equals(prop.getName())) {
                    idProp = prop;
                    // Let's force it to be the first property to output
                    // (although it may still get rearranged etc)
                    if (i > 0) {
                        props.remove(i);
                        props.add(0, idProp);
                    }
                    break;
                }
            }
            JavaType idType = idProp.getType();
            gen = new PropertyBasedObjectIdGenerator(objectIdInfo, idProp);
            // one more thing: must ensure that ObjectIdWriter does not actually write the value:
            return ObjectIdWriter.construct(idType, (PropertyName) null, gen, objectIdInfo.getAlwaysAsId());
            
        } 
        // other types are simpler
        JavaType type = prov.constructType(implClass);
        // Could require type to be passed explicitly, but we should be able to find it too:
        JavaType idType = prov.getTypeFactory().findTypeParameters(type, ObjectIdGenerator.class)[0];
        gen = prov.objectIdGeneratorInstance(beanDesc.getClassInfo(), objectIdInfo);
        return ObjectIdWriter.construct(idType, objectIdInfo.getPropertyName(), gen,
                objectIdInfo.getAlwaysAsId());
    }

    
Method called to construct a filtered writer, for given view
definitions. Default implementation constructs filter that checks
active view type to views property is to be included in.
/**
     * Method called to construct a filtered writer, for given view
     * definitions. Default implementation constructs filter that checks
     * active view type to views property is to be included in.
     */
    protected BeanPropertyWriter constructFilteredBeanWriter(BeanPropertyWriter writer,
            Class<?>[] inViews)
    {
        return FilteredBeanPropertyWriter.constructViewBased(writer, inViews);
    }

    protected PropertyBuilder constructPropertyBuilder(SerializationConfig config,
            BeanDescription beanDesc)
    {
        return new PropertyBuilder(config, beanDesc);
    }

    protected BeanSerializerBuilder constructBeanSerializerBuilder(BeanDescription beanDesc) {
        return new BeanSerializerBuilder(beanDesc);
    }

    /*
    /**********************************************************
    /* Overridable non-public introspection methods
    /**********************************************************
     */
    
    
Helper method used to skip processing for types that we know
cannot be (i.e. are never consider to be) beans: 
things like primitives, Arrays, Enums, and proxy types.

Note that usually we shouldn't really be getting these sort of
types anyway; but better safe than sorry.
/**
     * Helper method used to skip processing for types that we know
     * cannot be (i.e. are never consider to be) beans: 
     * things like primitives, Arrays, Enums, and proxy types.
     *<p>
     * Note that usually we shouldn't really be getting these sort of
     * types anyway; but better safe than sorry.
     */
    protected boolean isPotentialBeanType(Class<?> type)
    {
        return (ClassUtil.canBeABeanType(type) == null) && !ClassUtil.isProxyType(type);
    }

    
Method used to collect all actual serializable properties.
Can be overridden to implement custom detection schemes.
/**
     * Method used to collect all actual serializable properties.
     * Can be overridden to implement custom detection schemes.
     */
    protected List<BeanPropertyWriter> findBeanProperties(SerializerProvider prov,
            BeanDescription beanDesc, BeanSerializerBuilder builder)
        throws JsonMappingException
    {
        List<BeanPropertyDefinition> properties = beanDesc.findProperties();
        final SerializationConfig config = prov.getConfig();

        // ignore specified types
        removeIgnorableTypes(config, beanDesc, properties);
        
        // and possibly remove ones without matching mutator...
        if (config.isEnabled(MapperFeature.REQUIRE_SETTERS_FOR_GETTERS)) {
            removeSetterlessGetters(config, beanDesc, properties);
        }
        
        // nothing? can't proceed (caller may or may not throw an exception)
        if (properties.isEmpty()) {
            return null;
        }
        // null is for value type serializer, which we don't have access to from here (ditto for bean prop)
        boolean staticTyping = usesStaticTyping(config, beanDesc, null);
        PropertyBuilder pb = constructPropertyBuilder(config, beanDesc);
        
        ArrayList<BeanPropertyWriter> result = new ArrayList<BeanPropertyWriter>(properties.size());
        for (BeanPropertyDefinition property : properties) {
            final AnnotatedMember accessor = property.getAccessor();
            // Type id? Requires special handling:
            if (property.isTypeId()) {
                if (accessor != null) {
                    builder.setTypeId(accessor);
                }
                continue;
            }
            // suppress writing of back references
            AnnotationIntrospector.ReferenceProperty refType = property.findReferenceType();
            if (refType != null && refType.isBackReference()) {
                continue;
            }
            if (accessor instanceof AnnotatedMethod) {
                result.add(_constructWriter(prov, property, pb, staticTyping, (AnnotatedMethod) accessor));
            } else {
                result.add(_constructWriter(prov, property, pb, staticTyping, (AnnotatedField) accessor));
            }
        }
        return result;
    }

    /*
    /**********************************************************
    /* Overridable non-public methods for manipulating bean properties
    /**********************************************************
     */
    
    
Overridable method that can filter out properties. Default implementation
checks annotations class may have.
/**
     * Overridable method that can filter out properties. Default implementation
     * checks annotations class may have.
     */
    protected List<BeanPropertyWriter> filterBeanProperties(SerializationConfig config,
            BeanDescription beanDesc, List<BeanPropertyWriter> props)
    {
        // 01-May-2016, tatu: Which base type to use here gets tricky, since
        //   it may often make most sense to use general type for overrides,
        //   but what we have here may be more specific impl type. But for now
        //   just use it as is.
        JsonIgnoreProperties.Value ignorals = config.getDefaultPropertyIgnorals(beanDesc.getBeanClass(),
                beanDesc.getClassInfo());
        Set<String> ignored = null;
        if (ignorals != null) {
            ignored = ignorals.findIgnoredForSerialization();
        }
        JsonIncludeProperties.Value inclusions = config.getDefaultPropertyInclusions(beanDesc.getBeanClass(),
                beanDesc.getClassInfo());
        Set<String> included = null;
        if (inclusions != null) {
            included = inclusions.getIncluded();
        }
        if (included != null || (ignored != null && !ignored.isEmpty())) {
            Iterator<BeanPropertyWriter> it = props.iterator();
            while (it.hasNext()) {
                if (IgnorePropertiesUtil.shouldIgnore(it.next().getName(), ignored, included)) {
                    it.remove();
                }
            }
        }

        return props;
    }

    
Method called to handle view information for constructed serializer,
based on bean property writers.

Note that this method is designed to be overridden by sub-classes
if they want to provide custom view handling. As such it is not
considered an internal implementation detail, and will be supported
as part of API going forward.
/**
     * Method called to handle view information for constructed serializer,
     * based on bean property writers.
     *<p>
     * Note that this method is designed to be overridden by sub-classes
     * if they want to provide custom view handling. As such it is not
     * considered an internal implementation detail, and will be supported
     * as part of API going forward.
     */
    protected void processViews(SerializationConfig config, BeanSerializerBuilder builder)
    {
        // whether non-annotated fields are included by default or not is configurable
        List<BeanPropertyWriter> props = builder.getProperties();
        boolean includeByDefault = config.isEnabled(MapperFeature.DEFAULT_VIEW_INCLUSION);
        final int propCount = props.size();
        int viewsFound = 0;
        BeanPropertyWriter[] filtered = new BeanPropertyWriter[propCount];
        // Simple: view information is stored within individual writers, need to combine:
        for (int i = 0; i < propCount; ++i) {
            BeanPropertyWriter bpw = props.get(i);
            Class<?>[] views = bpw.getViews();
            if (views == null
                    // [databind#2311]: sometimes we add empty array
                    || views.length == 0) { // no view info? include or exclude by default?
                if (includeByDefault) {
                    filtered[i] = bpw;
                }
            } else {
                ++viewsFound;
                filtered[i] = constructFilteredBeanWriter(bpw, views);
            }
        }
        // minor optimization: if no view info, include-by-default, can leave out filtering info altogether:
        if (includeByDefault && viewsFound == 0) {
            return;
        }
        builder.setFilteredProperties(filtered);
    }

    
Method that will apply by-type limitations (as per [JACKSON-429]); by default this is based on JsonIgnoreType annotation but can be supplied by module-provided introspectors too. Starting with 2.8 there are also "Config overrides" to consider. /**
     * Method that will apply by-type limitations (as per [JACKSON-429]);
     * by default this is based on {@link com.fasterxml.jackson.annotation.JsonIgnoreType}
     * annotation but can be supplied by module-provided introspectors too.
     * Starting with 2.8 there are also "Config overrides" to consider.
     */
    protected void removeIgnorableTypes(SerializationConfig config, BeanDescription beanDesc,
            List<BeanPropertyDefinition> properties)
    {
        AnnotationIntrospector intr = config.getAnnotationIntrospector();
        HashMap<Class<?>,Boolean> ignores = new HashMap<Class<?>,Boolean>();
        Iterator<BeanPropertyDefinition> it = properties.iterator();
        while (it.hasNext()) {
            BeanPropertyDefinition property = it.next();
            AnnotatedMember accessor = property.getAccessor();
            /* 22-Oct-2016, tatu: Looks like this removal is an important part of
             *    processing, as taking it out will result in a few test failures...
             *    But should probably be done somewhere else, not here?
             */
            if (accessor == null) {
                it.remove();
                continue;
            }
            Class<?> type = property.getRawPrimaryType();
            Boolean result = ignores.get(type);
            if (result == null) {
                // 21-Apr-2016, tatu: For 2.8, can specify config overrides
                result = config.getConfigOverride(type).getIsIgnoredType();
                if (result == null) {
                    BeanDescription desc = config.introspectClassAnnotations(type);
                    AnnotatedClass ac = desc.getClassInfo();
                    result = intr.isIgnorableType(ac);
                    // default to false, non-ignorable
                    if (result == null) {
                        result = Boolean.FALSE;
                    }
                }
                ignores.put(type, result);
            }
            // lotsa work, and yes, it is ignorable type, so:
            if (result.booleanValue()) {
                it.remove();
            }
        }
    }

    
Helper method that will remove all properties that do not have a mutator.
/**
     * Helper method that will remove all properties that do not have a mutator.
     */
    protected void removeSetterlessGetters(SerializationConfig config, BeanDescription beanDesc,
            List<BeanPropertyDefinition> properties)
    {
        Iterator<BeanPropertyDefinition> it = properties.iterator();
        while (it.hasNext()) {
            BeanPropertyDefinition property = it.next();
            // one caveat: only remove implicit properties;
            // explicitly annotated ones should remain
            if (!property.couldDeserialize() && !property.isExplicitlyIncluded()) {
                it.remove();
            }
        }
    }

    
Helper method called to ensure that we do not have "duplicate" type ids.
Added to resolve [databind#222]
Since:
2.6/**
     * Helper method called to ensure that we do not have "duplicate" type ids.
     * Added to resolve [databind#222]
     *
     * @since 2.6
     */
    protected List<BeanPropertyWriter> removeOverlappingTypeIds(SerializerProvider prov,
            BeanDescription beanDesc, BeanSerializerBuilder builder,
            List<BeanPropertyWriter> props)
    {
        for (int i = 0, end = props.size(); i < end; ++i) {
            BeanPropertyWriter bpw = props.get(i);
            TypeSerializer td = bpw.getTypeSerializer();
            if ((td == null) || (td.getTypeInclusion() != As.EXTERNAL_PROPERTY)) {
                continue;
            }
            String n = td.getPropertyName();
            PropertyName typePropName = PropertyName.construct(n);

            for (BeanPropertyWriter w2 : props) {
                if ((w2 != bpw) && w2.wouldConflictWithName(typePropName)) {
                    bpw.assignTypeSerializer(null);
                    break;
                }
            }
        }
        return props;
    }
    
    /*
    /**********************************************************
    /* Internal helper methods
    /**********************************************************
     */

    
Secondary helper method for constructing BeanPropertyWriter for given member (field or method). /**
     * Secondary helper method for constructing {@link BeanPropertyWriter} for
     * given member (field or method).
     */
    protected BeanPropertyWriter _constructWriter(SerializerProvider prov,
            BeanPropertyDefinition propDef,
            PropertyBuilder pb, boolean staticTyping, AnnotatedMember accessor)
        throws JsonMappingException
    {
        final PropertyName name = propDef.getFullName();
        JavaType type = accessor.getType();
        BeanProperty.Std property = new BeanProperty.Std(name, type, propDef.getWrapperName(),
                accessor, propDef.getMetadata());

        // Does member specify a serializer? If so, let's use it.
        JsonSerializer<?> annotatedSerializer = findSerializerFromAnnotation(prov,
                accessor);
        // Unlike most other code paths, serializer produced
        // here will NOT be resolved or contextualized, unless done here, so:
        if (annotatedSerializer instanceof ResolvableSerializer) {
            ((ResolvableSerializer) annotatedSerializer).resolve(prov);
        }
        // 05-Sep-2013, tatu: should be primary property serializer so:
        annotatedSerializer = prov.handlePrimaryContextualization(annotatedSerializer, property);
        // And how about polymorphic typing? First special to cover JAXB per-field settings:
        TypeSerializer contentTypeSer = null;
        // 16-Feb-2014, cgc: contentType serializers for collection-like and map-like types
        if (type.isContainerType() || type.isReferenceType()) {
            contentTypeSer = findPropertyContentTypeSerializer(type, prov.getConfig(), accessor);
        }
        // and if not JAXB collection/array with annotations, maybe regular type info?
        TypeSerializer typeSer = findPropertyTypeSerializer(type, prov.getConfig(), accessor);
        return pb.buildWriter(prov, propDef, type, annotatedSerializer,
                        typeSer, contentTypeSer, accessor, staticTyping);
    }

    protected JsonSerializer<?> _findUnsupportedTypeSerializer(SerializerProvider ctxt,
            JavaType type, BeanDescription beanDesc)
        throws JsonMappingException
    {
        // 05-May-2020, tatu: Should we check for possible Shape override to "POJO"?
        //   (to let users force 'serialize-as-POJO'?
        final String errorMsg = BeanUtil.checkUnsupportedType(type);
        if (errorMsg != null) {
            // 30-Sep-2020, tatu: [databind#2867] Avoid checks if there is a mix-in
            //    which likely providers a handler...
            if (ctxt.getConfig().findMixInClassFor(type.getRawClass()) == null) {
                return new UnsupportedTypeSerializer(type, errorMsg);
            }
        }
        return null;
    }
}