Serialization

public abstract class JsonSerializer<T> {
    // Core serialization method
    public abstract void serialize(T value, JsonGenerator gen, SerializerProvider serializers) throws IOException;
    
    // Type-aware serialization (for polymorphic types)
    public void serializeWithType(T value, JsonGenerator gen, SerializerProvider serializers, TypeSerializer typeSer) throws IOException;
    
    // Metadata methods
    public Class<T> handledType();
    public boolean isEmpty(SerializerProvider provider, T value);
    public boolean isEmpty(T value);
    public boolean usesObjectId();
    
    // Contextual serialization
    public JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException;
    
    // Resolution support
    public void resolve(SerializerProvider provider) throws JsonMappingException;
    
    // Deprecated delegation
    public JsonSerializer<T> replaceDelegatee(JsonSerializer<?> delegatee);
    public JsonSerializer<?> getDelegatee();
    
    // Schema support
    public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType type) throws JsonMappingException;
    
    // Iterator support for container types
    public boolean isUnwrappingSerializer();
    public JsonSerializer<T> unwrappingSerializer(NameTransformer unwrapper);
    
    // Null handling marker classes
    public static abstract class None extends JsonSerializer<Object> { }
}

public abstract class SerializerProvider extends DatabindContext {
    // Serializer lookup methods
    public abstract JsonSerializer<Object> findValueSerializer(Class<?> valueType, BeanProperty property) throws JsonMappingException;
    public abstract JsonSerializer<Object> findValueSerializer(JavaType valueType, BeanProperty property) throws JsonMappingException;
    public abstract JsonSerializer<Object> findValueSerializer(Class<?> valueType) throws JsonMappingException;
    public abstract JsonSerializer<Object> findValueSerializer(JavaType valueType) throws JsonMappingException;
    
    // Primary value serializer (with type info)
    public abstract JsonSerializer<Object> findPrimaryPropertySerializer(JavaType valueType, BeanProperty property) throws JsonMappingException;
    public abstract JsonSerializer<Object> findPrimaryPropertySerializer(Class<?> valueType, BeanProperty property) throws JsonMappingException;
    
    // Typed serializers
    public abstract JsonSerializer<Object> findTypedValueSerializer(Class<?> valueType, boolean cache, BeanProperty property) throws JsonMappingException;
    public abstract JsonSerializer<Object> findTypedValueSerializer(JavaType valueType, boolean cache, BeanProperty property) throws JsonMappingException;
    
    // Key serializers
    public abstract JsonSerializer<Object> findKeySerializer(JavaType keyType, BeanProperty property) throws JsonMappingException;
    public abstract JsonSerializer<Object> findKeySerializer(Class<?> keyType, BeanProperty property) throws JsonMappingException;
    
    // Content serializers
    public abstract JsonSerializer<Object> findContentValueSerializer(Class<?> valueType, BeanProperty property) throws JsonMappingException;
    public abstract JsonSerializer<Object> findContentValueSerializer(JavaType valueType, BeanProperty property) throws JsonMappingException;
    
    // Null serializers
    public abstract JsonSerializer<Object> getDefaultNullKeySerializer();
    public abstract JsonSerializer<Object> getDefaultNullValueSerializer();
    public abstract JsonSerializer<Object> findNullKeySerializer(JavaType serializationType, BeanProperty property) throws JsonMappingException;
    public abstract JsonSerializer<Object> findNullValueSerializer(BeanProperty property) throws JsonMappingException;
    
    // Unknown type serializer  
    public abstract JsonSerializer<Object> getUnknownTypeSerializer(Class<?> unknownType);
    
    // Serialization methods
    public void serializeValue(JsonGenerator gen, Object value) throws IOException;
    public void serializeValue(JsonGenerator gen, Object value, JavaType rootType) throws IOException;
    public void serializeValue(JsonGenerator gen, Object value, JavaType rootType, JsonSerializer<Object> ser) throws IOException;
    public void defaultSerializeValue(JsonGenerator gen, Object value) throws IOException;
    public void defaultSerializeField(String fieldName, Object value, JsonGenerator gen) throws IOException;
    public void defaultSerializeNull(JsonGenerator gen) throws IOException;
    
    // Polymorphic serialization
    public void defaultSerializeValue(JsonGenerator gen, Object value, JavaType type) throws IOException;
    
    // Exception handling  
    public void reportMappingProblem(String msg, Object... msgArgs) throws JsonMappingException;
    public <T> T reportBadTypeDefinition(BeanDescription bean, String msg, Object... msgArgs) throws JsonMappingException;
    public <T> T reportBadPropertyDefinition(BeanDescription bean, BeanPropertyDefinition prop, String message, Object... msgArgs) throws JsonMappingException;
    
    // Configuration access
    public abstract SerializationConfig getConfig();
    
    // Filtering
    public abstract FilterProvider getFilterProvider();
    
    // View support
    public final boolean isEnabled(MapperFeature feature);
    public final boolean isEnabled(SerializationFeature feature);
    public final boolean canOverrideAccessModifiers();
    
    // Generator access
    public JsonGenerator getGenerator();
    
    // Attributes
    public abstract Object getAttribute(Object key);
    public abstract SerializerProvider setAttribute(Object key, Object value);
    
    // Type factory access
    public final TypeFactory getTypeFactory();
    
    // Root name handling
    public PropertyName findRootName(JavaType rootType);
    public PropertyName findRootName(Class<?> rawRootType);
    
    // Cached serializers
    public abstract boolean hasSerializerFor(Class<?> cls, AtomicReference<Throwable> cause);
    
    // Format-specific
    public WritableObjectId findObjectId(Object forPojo, ObjectIdGenerator<?> generatorType);
    
    // Date handling
    public DateFormat getDateFormat();
    public boolean hasDateFormat();
    public Locale getLocale();
    public TimeZone getTimeZone();
}

public abstract class StdSerializer<T> extends JsonSerializer<T> implements JsonFormatVisitable, Serializable {
    // Construction
    protected StdSerializer(Class<T> t);
    protected StdSerializer(JavaType type);
    protected StdSerializer(Class<?> t, boolean dummy);
    protected StdSerializer(StdSerializer<?> src);
    
    // Type information
    public Class<T> handledType();
    
    // Schema support
    public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException;
    public JsonNode getSchema(SerializerProvider provider, Type typeHint) throws JsonMappingException;
    public JsonNode getSchema(SerializerProvider provider, Type typeHint, boolean isOptional) throws JsonMappingException;
    
    // Utility methods for subclasses
    protected void visitStringFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException;
    protected void visitStringFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint, JsonValueFormat format) throws JsonMappingException;
    protected void visitIntFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint, JsonParser.NumberType numberType) throws JsonMappingException;
    protected void visitIntFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint, JsonParser.NumberType numberType, JsonValueFormat format) throws JsonMappingException;
    protected void visitFloatFormat(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException;
    protected boolean isDefaultSerializer(JsonSerializer<?> serializer);
    
    // Exception creation helpers
    protected JsonMappingException wrapAndThrow(SerializerProvider provider, Throwable t, Object bean, String fieldName) throws JsonMappingException;
    protected JsonMappingException wrapAndThrow(SerializerProvider provider, Throwable t, Object bean, int index) throws JsonMappingException;
}

// Scalar serializers
public abstract class StdScalarSerializer<T> extends StdSerializer<T> {
    protected StdScalarSerializer(Class<T> t);
    protected StdScalarSerializer(Class<?> t, boolean dummy);
    
    public void serializeWithType(T value, JsonGenerator gen, SerializerProvider provider, TypeSerializer typeSer) throws IOException;
}

public abstract class ContainerSerializer<T> extends StdSerializer<T> {
    protected ContainerSerializer(Class<T> t);
    protected ContainerSerializer(Class<?> t, boolean dummy);
    protected ContainerSerializer(JavaType fullType);
    protected ContainerSerializer(ContainerSerializer<?> src);
    
    // Container-specific methods
    public abstract boolean hasSingleElement(T value);
    public abstract boolean isEmpty(SerializerProvider prov, T value);
    
    // Content serializer access
    protected abstract JsonSerializer<?> _withValueTypeSerializer(TypeSerializer vts);
}

// Array serializer
public class ObjectArraySerializer extends ArraySerializerBase<Object[]> {
    public ObjectArraySerializer(JavaType elemType, boolean staticTyping, TypeSerializer vts, JsonSerializer<Object> elementSerializer);
    public JsonSerializer<?> _withValueTypeSerializer(TypeSerializer vts);
    public ContainerSerializer<?> _withValueTypeSerializer(TypeSerializer vts);
    public void serializeContents(Object[] value, JsonGenerator gen, SerializerProvider provider) throws IOException;
    public JsonNode getSchema(SerializerProvider provider, Type typeHint);
}

// Collection serializers
public class CollectionSerializer extends AsArraySerializerBase<Collection<?>> {
    public CollectionSerializer(JavaType elemType, boolean staticTyping, TypeSerializer vts, JsonSerializer<Object> valueSerializer);
    public ContainerSerializer<?> _withValueTypeSerializer(TypeSerializer vts);
    public void serialize(Collection<?> value, JsonGenerator gen, SerializerProvider provider) throws IOException;
    public void serializeContents(Collection<?> value, JsonGenerator gen, SerializerProvider provider) throws IOException;
}

// Map serializer
public class MapSerializer extends ContainerSerializer<Map<?, ?>> implements ContextualSerializer {
    public MapSerializer(Set<String> ignoredEntries, JavaType keyType, JavaType valueType, boolean valueTypeIsStatic, TypeSerializer vts, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer);
    public ContainerSerializer<?> _withValueTypeSerializer(TypeSerializer vts);
    public MapSerializer withResolved(BeanProperty property, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer, Set<String> ignored, boolean sortKeys);
    public JsonSerializer<?> createContextual(SerializerProvider provider, BeanProperty property) throws JsonMappingException;
    public void serialize(Map<?, ?> value, JsonGenerator gen, SerializerProvider provider) throws IOException;
    public void serializeOptionalFields(Map<?, ?> value, JsonGenerator gen, SerializerProvider provider, Object suppressableValue) throws IOException;
    public void serializeFields(Map<?, ?> value, JsonGenerator gen, SerializerProvider provider) throws IOException;
    public void serializeFieldsUsing(Map<?, ?> value, JsonGenerator gen, SerializerProvider provider, JsonSerializer<Object> ser) throws IOException;
}

public class BeanSerializer extends BeanSerializerBase implements Serializable {
    // Construction
    public BeanSerializer(JavaType type, BeanSerializerBuilder builder, BeanPropertyWriter[] properties, BeanPropertyWriter[] filteredProperties);
    protected BeanSerializer(BeanSerializerBase src, ObjectIdWriter objectIdWriter);
    protected BeanSerializer(BeanSerializerBase src, ObjectIdWriter objectIdWriter, Object filterId);
    protected BeanSerializer(BeanSerializerBase src, Set<String> toIgnore, Set<String> toInclude);
    
    // Factory methods
    public static BeanSerializer createDummy(JavaType forType);
    
    // Serialization
    public void serialize(Object bean, JsonGenerator gen, SerializerProvider provider) throws IOException;
    protected void serializeFields(Object bean, JsonGenerator gen, SerializerProvider provider) throws IOException;
    protected void serializeFieldsFiltered(Object bean, JsonGenerator gen, SerializerProvider provider) throws IOException;
    
    // String representation
    public String toString();
}

public abstract class BeanSerializerBase extends StdSerializer<Object> implements ContextualSerializer, ResolvableSerializer, JsonFormatVisitable, Serializable {
    // Property writers
    protected final BeanPropertyWriter[] _props;
    protected final BeanPropertyWriter[] _filteredProps;
    
    // Special properties
    protected final AnyGetterWriter _anyGetterWriter;
    protected final Object _propertyFilterId;
    protected final AnnotatedMember _typeIdDef;
    
    // Object identity
    protected final ObjectIdWriter _objectIdWriter;
    
    // Shape and features
    protected final JsonFormat.Shape _serializationShape;
    
    // Construction
    protected BeanSerializerBase(JavaType type, BeanSerializerBuilder builder, BeanPropertyWriter[] properties, BeanPropertyWriter[] filteredProperties);
    protected BeanSerializerBase(BeanSerializerBase src, BeanPropertyWriter[] properties, BeanPropertyWriter[] filteredProperties);
    protected BeanSerializerBase(BeanSerializerBase src, ObjectIdWriter objectIdWriter);
    protected BeanSerializerBase(BeanSerializerBase src, ObjectIdWriter objectIdWriter, Object filterId);
    protected BeanSerializerBase(BeanSerializerBase src, Set<String> toIgnore, Set<String> toInclude);
    
    // Abstract serialization methods
    public abstract void serialize(Object bean, JsonGenerator gen, SerializerProvider provider) throws IOException;
    protected abstract void serializeFields(Object bean, JsonGenerator gen, SerializerProvider provider) throws IOException;
    protected abstract void serializeFieldsFiltered(Object bean, JsonGenerator gen, SerializerProvider provider) throws IOException;
    
    // Metadata
    public boolean usesObjectId();
    
    // Contextualization
    public JsonSerializer<?> createContextual(SerializerProvider provider, BeanProperty property) throws JsonMappingException;
    
    // Resolution
    public void resolve(SerializerProvider provider) throws JsonMappingException;
    
    // Schema support
    public JsonNode getSchema(SerializerProvider provider, Type typeHint) throws JsonMappingException;
    public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException;
}

public class BeanPropertyWriter extends PropertyWriter implements Serializable {
    // Property metadata
    protected final SerializedString _name;
    protected final PropertyName _wrapperName;
    protected final JavaType _declaredType;
    protected final JavaType _cfgSerializationType;
    protected final AnnotatedMember _member;
    protected final BeanProperty.Std _internalSettings;
    
    // Serialization
    protected JsonSerializer<Object> _serializer;
    protected JsonSerializer<Object> _nullSerializer;
    protected TypeSerializer _typeSerializer;
    
    // Filtering and inclusion
    protected Class<?>[] _includeInViews;
    protected PropertyFilter _filter;
    protected Object _suppressableValue;
    protected boolean _suppressNulls;
    
    // Construction
    public BeanPropertyWriter(BeanPropertyDefinition propDef, AnnotatedMember member, Annotations contextAnnotations, JavaType declaredType, JsonSerializer<?> ser, TypeSerializer typeSer, JavaType serType, boolean suppressNulls, Object suppressableValue, Class<?>[] includeInViews);
    protected BeanPropertyWriter(BeanPropertyWriter base, PropertyName name);
    protected BeanPropertyWriter(BeanPropertyWriter base, JsonSerializer<?> ser);
    
    // Factory methods  
    public BeanPropertyWriter rename(PropertyName newName);
    public BeanPropertyWriter withSerializer(JsonSerializer<?> ser);
    public BeanPropertyWriter withNullSerializer(JsonSerializer<?> nullSer);
    
    // Assignment
    public void assignSerializer(JsonSerializer<Object> ser);
    public void assignNullSerializer(JsonSerializer<Object> nullSer);
    public void assignTypeSerializer(TypeSerializer typeSer);
    
    // Serialization
    public void serializeAsField(Object bean, JsonGenerator gen, SerializerProvider prov) throws Exception;
    public void serializeAsOmittedField(Object bean, JsonGenerator gen, SerializerProvider prov) throws Exception;
    public void serializeAsElement(Object bean, JsonGenerator gen, SerializerProvider prov) throws Exception;
    public void serializeAsPlaceholder(Object bean, JsonGenerator gen, SerializerProvider prov) throws Exception;
    
    // Value access
    public Object get(Object bean) throws Exception;
    public void set(Object bean, Object value) throws Exception;
    
    // Property information
    public String getName();
    public PropertyName getFullName();
    public JavaType getType();
    public PropertyName getWrapperName();
    public AnnotatedMember getMember();
    public <A extends Annotation> A getAnnotation(Class<A> acls);
    public <A extends Annotation> A getContextAnnotation(Class<A> acls);
    
    // Filtering and views
    public boolean willSuppressNulls();
    public Class<?>[] getViews();
    
    // Schema support  
    public void depositSchemaProperty(JsonObjectFormatVisitor objectVisitor, SerializerProvider provider) throws JsonMappingException;
    
    // String representation
    public String toString();
}

public abstract class SerializerFactory {
    // Serializer creation
    public abstract JsonSerializer<Object> createSerializer(SerializerProvider prov, JavaType type) throws JsonMappingException;
    public abstract JsonSerializer<Object> createKeySerializer(SerializerProvider prov, JavaType type, JsonSerializer<Object> defaultImpl) throws JsonMappingException;
    
    // Type serializer creation
    public abstract TypeSerializer createTypeSerializer(SerializationConfig config, JavaType baseType) throws JsonMappingException;
    
    // Configuration
    public abstract SerializerFactory withAdditionalSerializers(Serializers additional);
    public abstract SerializerFactory withAdditionalKeySerializers(Serializers additional);
    public abstract SerializerFactory withSerializerModifier(BeanSerializerModifier modifier);
    public abstract SerializerFactory withConfig(SerializationConfig config);
}

public class BeanSerializerFactory extends BasicSerializerFactory implements Serializable {
    // Singleton instance
    public static final BeanSerializerFactory instance;
    
    // Construction
    public BeanSerializerFactory(SerializerFactoryConfig config);
    
    // Factory methods
    public SerializerFactory withConfig(SerializationConfig config);
    public SerializerFactory withAdditionalSerializers(Serializers additional);
    public SerializerFactory withAdditionalKeySerializers(Serializers additional);
    public SerializerFactory withSerializerModifier(BeanSerializerModifier modifier);
    
    // Serializer creation
    public JsonSerializer<Object> createSerializer(SerializerProvider prov, JavaType type) throws JsonMappingException;
    
    // Bean serializer creation
    public JsonSerializer<Object> findBeanSerializer(SerializerProvider prov, JavaType type, BeanDescription beanDesc) throws JsonMappingException;
    public JsonSerializer<Object> constructBeanSerializer(SerializerProvider prov, BeanDescription beanDesc) throws JsonMappingException;
    
    // Builder creation
    protected BeanSerializerBuilder constructBeanSerializerBuilder(BeanDescription beanDesc);
    protected BeanSerializer createBeanSerializer(SerializerProvider prov, JavaType type, BeanDescription beanDesc, JsonFormat.Value format) throws JsonMappingException;
    
    // Property handling
    protected void removeIgnorableTypes(SerializationConfig config, BeanDescription beanDesc, List<BeanPropertyDefinition> properties);
    protected void removeSetterlessGetters(SerializationConfig config, BeanDescription beanDesc, List<BeanPropertyDefinition> properties);
    protected void addBeanProps(SerializationConfig config, BeanDescription beanDesc, BeanSerializerBuilder builder) throws JsonMappingException;
    protected List<BeanPropertyWriter> findBeanProperties(SerializerProvider prov, BeanDescription beanDesc, BeanSerializerBuilder builder) throws JsonMappingException;
    protected BeanPropertyWriter buildWriter(SerializerProvider prov, BeanPropertyDefinition propDef, JavaType declaredType, JsonSerializer<?> ser, TypeSerializer typeSer, TypeSerializer contentTypeSer, AnnotatedMember am, boolean defaultUseStaticTyping) throws JsonMappingException;
    
    // Filtering
    protected PropertyFilter findPropertyFilter(SerializerProvider provider, Object filterId, Object valueToFilter) throws JsonMappingException;
}

public final class SerializationConfig extends MapperConfigBase<SerializationFeature, SerializationConfig> implements Serializable {
    // Construction
    public SerializationConfig(BaseSettings base, SubtypeResolver str, SimpleMixInResolver mixins, RootNameLookup rootNames, ConfigOverrides configOverrides);
    
    // Configuration modification
    public SerializationConfig with(SerializationFeature feature);
    public SerializationConfig with(SerializationFeature first, SerializationFeature... features);
    public SerializationConfig withFeatures(SerializationFeature... features);  
    public SerializationConfig without(SerializationFeature feature);
    public SerializationConfig without(SerializationFeature first, SerializationFeature... features);
    public SerializationConfig withoutFeatures(SerializationFeature... features);
    
    // Feature checking
    public boolean isEnabled(SerializationFeature f);
    public int getSerializationFeatures();
    
    // Generator configuration
    public SerializationConfig with(JsonGenerator.Feature feature);
    public SerializationConfig withFeatures(JsonGenerator.Feature... features);
    public SerializationConfig without(JsonGenerator.Feature feature);
    public SerializationConfig withoutFeatures(JsonGenerator.Feature... features);
    
    // Other configuration  
    public SerializationConfig with(FilterProvider filters);
    public SerializationConfig withDefaultPrettyPrinter(PrettyPrinter pp);
    public SerializationConfig withRootName(PropertyName rootName);
    public SerializationConfig withRootName(String rootName);
    public SerializationConfig withView(Class<?> view);
    
    // Access methods
    public FilterProvider getFilterProvider();
    public PrettyPrinter getDefaultPrettyPrinter();
    public <T extends BeanDescription> T introspect(JavaType type);
    
    // Serialization inclusion
    public JsonInclude.Value getDefaultPropertyInclusion();
    public JsonInclude.Value getDefaultPropertyInclusion(Class<?> baseType);
    public JsonInclude.Value getDefaultInclusion(Class<?> baseType, Class<?> propertyType);
    
    // Date format
    public String getDateFormatPattern();
    public DateFormat getDateFormat();
    
    // Root name handling
    public PropertyName findRootName(JavaType rootType);
    public PropertyName findRootName(Class<?> rawRootType);
    
    // View support
    public Class<?> getActiveView();
    
    // Attributes
    public ContextAttributes getAttributes();
}

public enum SerializationFeature implements ConfigFeature {
    // Wrapping and formatting
    WRAP_ROOT_VALUE(false),
    INDENT_OUTPUT(false),
    
    // Error handling
    FAIL_ON_EMPTY_BEANS(true),
    FAIL_ON_SELF_REFERENCES(true),
    WRAP_EXCEPTIONS(true),
    FAIL_ON_UNWRAPPED_TYPE_IDENTIFIERS(true),
    
    // Reference handling
    WRITE_SELF_REFERENCES_AS_NULL(false),
    
    // Resource management
    CLOSE_CLOSEABLE(false),
    FLUSH_AFTER_WRITE_VALUE(true),
    
    // Date and time handling
    WRITE_DATES_AS_TIMESTAMPS(true),
    WRITE_DATE_KEYS_AS_TIMESTAMPS(false),
    WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS(true),
    
    // Array and character handling
    WRITE_CHAR_ARRAYS_AS_JSON_ARRAYS(false),
    
    // Enum handling  
    WRITE_ENUMS_USING_TO_STRING(false),
    WRITE_ENUMS_USING_INDEX(false),
    WRITE_ENUM_KEYS_USING_INDEX(false),
    
    // Map handling
    WRITE_NULL_MAP_VALUES(true),
    WRITE_EMPTY_JSON_ARRAYS(true),
    WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED(false),
    ORDER_MAP_ENTRIES_BY_KEYS(false),
    
    // Number handling
    WRITE_BIGDECIMAL_AS_PLAIN(false),
    
    // Object identity
    USE_EQUALITY_FOR_OBJECT_ID(false);
    
    private final boolean _defaultState;
    private final int _mask;
    
    private SerializationFeature(boolean defaultState) {
        _defaultState = defaultState;
        _mask = (1 << ordinal());
    }
    
    public boolean enabledByDefault() {
        return _defaultState;
    }
    
    public int getMask() {
        return _mask;
    }
    
    public boolean enabledIn(int flags) {
        return (flags & _mask) != 0;
    }
}

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

// Custom serializer for Person class
public class PersonSerializer extends StdSerializer<Person> {
    
    public PersonSerializer() {
        this(null);
    }
    
    public PersonSerializer(Class<Person> t) {
        super(t);
    }
    
    @Override
    public void serialize(Person person, JsonGenerator gen, SerializerProvider provider) throws IOException {
        gen.writeStartObject();
        gen.writeStringField("fullName", person.getFirstName() + " " + person.getLastName());
        gen.writeNumberField("age", person.getAge());
        
        // Custom date formatting
        if (person.getBirthDate() != null) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            gen.writeStringField("birthDate", sdf.format(person.getBirthDate()));
        }
        
        // Conditional field
        if (person.isActive()) {
            gen.writeStringField("status", "ACTIVE");
        }
        
        gen.writeEndObject();
    }
    
    // Optional: provide schema information
    @Override
    public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException {
        JsonObjectFormatVisitor objectVisitor = visitor.expectObjectFormat(typeHint);
        if (objectVisitor != null) {
            objectVisitor.property("fullName", JsonFormatTypes.STRING);
            objectVisitor.property("age", JsonFormatTypes.INTEGER);
            objectVisitor.optionalProperty("birthDate", JsonFormatTypes.STRING);
            objectVisitor.optionalProperty("status", JsonFormatTypes.STRING);
        }
    }
}

// Register with ObjectMapper
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addSerializer(Person.class, new PersonSerializer());
mapper.registerModule(module);

// Use
Person person = new Person("John", "Doe", 30);
String json = mapper.writeValueAsString(person);
// Result: {"fullName":"John Doe","age":30,"status":"ACTIVE"}

// Contextual serializer that adapts based on property annotations
public class MoneySerializer extends StdSerializer<Money> implements ContextualSerializer {
    
    private final String currency;
    private final boolean showSymbol;
    
    public MoneySerializer() {
        this(null, false);
    }
    
    private MoneySerializer(String currency, boolean showSymbol) {
        super(Money.class);
        this.currency = currency;
        this.showSymbol = showSymbol;
    }
    
    @Override
    public JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException {
        if (property != null) {
            CurrencyFormat ann = property.getAnnotation(CurrencyFormat.class);
            if (ann != null) {
                return new MoneySerializer(ann.currency(), ann.showSymbol());
            }
        }
        return this;
    }
    
    @Override
    public void serialize(Money money, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        if (showSymbol) {
            String symbol = getCurrencySymbol(currency != null ? currency : money.getCurrency());
            gen.writeString(symbol + money.getAmount());
        } else {
            gen.writeNumber(money.getAmount());
        }
    }
    
    private String getCurrencySymbol(String currency) {
        return switch (currency) {
            case "USD" -> "$";
            case "EUR" -> "€";
            case "GBP" -> "£";
            default -> currency + " ";
        };
    }
}

// Custom annotation
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface CurrencyFormat {
    String currency() default "";
    boolean showSymbol() default false;
}

// Usage in POJO
public class Product {
    private String name;
    
    @CurrencyFormat(currency = "USD", showSymbol = true)
    private Money price;
    
    @CurrencyFormat(currency = "USD", showSymbol = false)
    private Money cost;
    
    // getters/setters
}

// Custom collection serializer
public class PagedResultSerializer extends ContainerSerializer<PagedResult<?>> {
    
    private final JavaType elementType;
    private final JsonSerializer<Object> elementSerializer;
    
    public PagedResultSerializer(JavaType elementType, JsonSerializer<Object> elementSerializer) {
        super(PagedResult.class);
        this.elementType = elementType;
        this.elementSerializer = elementSerializer;
    }
    
    @Override
    public void serialize(PagedResult<?> value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        gen.writeStartObject();
        gen.writeArrayFieldStart("items");
        
        for (Object item : value.getItems()) {
            if (elementSerializer != null) {
                elementSerializer.serialize(item, gen, serializers);
            } else {
                serializers.defaultSerializeValue(item, gen);
            }
        }
        
        gen.writeEndArray();
        gen.writeNumberField("totalCount", value.getTotalCount());
        gen.writeNumberField("pageNumber", value.getPageNumber());
        gen.writeNumberField("pageSize", value.getPageSize());
        gen.writeBooleanField("hasNext", value.isHasNext());
        gen.writeEndObject();
    }
    
    @Override
    public boolean hasSingleElement(PagedResult<?> value) {
        return value.getItems().size() == 1;
    }
    
    @Override
    public boolean isEmpty(SerializerProvider prov, PagedResult<?> value) {
        return value.getItems().isEmpty();
    }
    
    @Override
    protected JsonSerializer<?> _withValueTypeSerializer(TypeSerializer vts) {
        // Return new instance with type serializer if needed
        return this;
    }
}

// Custom property writer for computed fields
public class ComputedPropertyWriter extends BeanPropertyWriter {
    
    private final Function<Object, Object> computer;
    
    public ComputedPropertyWriter(BeanPropertyDefinition propDef, AnnotatedMember member, 
                                 Function<Object, Object> computer) {
        super(propDef, member, null, propDef.getPrimaryType(), null, null, 
              propDef.getPrimaryType(), false, null, null);
        this.computer = computer;
    }
    
    @Override
    public Object get(Object bean) throws Exception {
        // Compute value dynamically
        return computer.apply(bean);
    }
    
    @Override
    public void serializeAsField(Object bean, JsonGenerator gen, SerializerProvider prov) throws Exception {
        Object value = get(bean);
        if (value == null) {
            if (_nullSerializer != null) {
                gen.writeFieldName(_name);
                _nullSerializer.serialize(null, gen, prov);
            }
        } else {
            gen.writeFieldName(_name);
            if (_serializer == null) {
                prov.defaultSerializeValue(value, gen);
            } else {
                _serializer.serialize(value, gen, prov);
            }
        }
    }
}

// Usage in custom bean serializer modifier
public class ComputedFieldSerializerModifier extends BeanSerializerModifier {
    
    @Override
    public BeanSerializerBuilder updateBuilder(SerializationConfig config, BeanDescription beanDesc, BeanSerializerBuilder builder) {
        // Add computed properties
        if (beanDesc.getBeanClass() == Person.class) {
            // Add fullName computed field
            SimpleBeanPropertyDefinition propDef = SimpleBeanPropertyDefinition.construct(
                config, null, new PropertyName("fullName"), PropertyMetadata.STD_REQUIRED_OR_OPTIONAL);
            
            ComputedPropertyWriter writer = new ComputedPropertyWriter(propDef, null, 
                bean -> {
                    Person person = (Person) bean;
                    return person.getFirstName() + " " + person.getLastName();
                });
            
            builder.addProperty(writer);
        }
        return builder;
    }
}

// Custom property filter
public class DynamicPropertyFilter implements PropertyFilter {
    
    private final Set<String> allowedFields;
    private final Predicate<Object> condition;
    
    public DynamicPropertyFilter(Set<String> allowedFields, Predicate<Object> condition) {
        this.allowedFields = allowedFields;
        this.condition = condition;
    }
    
    @Override
    public void serializeAsField(Object pojo, JsonGenerator gen, SerializerProvider prov, PropertyWriter writer) throws Exception {
        if (include(writer.getName(), pojo)) {
            writer.serializeAsField(pojo, gen, prov);
        } else {
            writer.serializeAsOmittedField(pojo, gen, prov);
        }
    }
    
    @Override
    public void serializeAsElement(Object elementValue, JsonGenerator gen, SerializerProvider prov, PropertyWriter writer) throws Exception {
        writer.serializeAsElement(elementValue, gen, prov);
    }
    
    @Override
    public void depositSchemaProperty(PropertyWriter writer, ObjectNode propertiesNode, SerializerProvider provider) throws JsonMappingException {
        writer.depositSchemaProperty(propertiesNode, provider);
    }
    
    private boolean include(String fieldName, Object pojo) {
        return allowedFields.contains(fieldName) && condition.test(pojo);
    }
}

// Usage with FilterProvider
SimpleFilterProvider filterProvider = new SimpleFilterProvider();
filterProvider.addFilter("dynamicFilter", new DynamicPropertyFilter(
    Set.of("name", "age", "email"),
    obj -> ((Person) obj).isActive()
));

ObjectMapper mapper = new ObjectMapper();
mapper.setFilterProvider(filterProvider);

// POJO with filter annotation
@JsonFilter("dynamicFilter")
public class Person {
    // fields and methods
}

ObjectMapper mapper = new ObjectMapper();

// Configure serialization features
mapper.configure(SerializationFeature.INDENT_OUTPUT, true);
mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
mapper.configure(SerializationFeature.WRAP_ROOT_VALUE, true);

// Multiple features at once
mapper.enable(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS,
              SerializationFeature.WRITE_ENUMS_USING_TO_STRING);

mapper.disable(SerializationFeature.WRITE_NULL_MAP_VALUES,
               SerializationFeature.WRITE_EMPTY_JSON_ARRAYS);

// Check feature status
boolean indented = mapper.isEnabled(SerializationFeature.INDENT_OUTPUT);
boolean timestampsAsNumbers = mapper.isEnabled(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

// Configure through ObjectWriter
ObjectWriter writer = mapper.writer()
    .with(SerializationFeature.INDENT_OUTPUT)
    .without(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
    .withDefaultPrettyPrinter();

String json = writer.writeValueAsString(object);

// Serializer interfaces
public interface ContextualSerializer {
    JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException;
}

public interface ResolvableSerializer {
    void resolve(SerializerProvider provider) throws JsonMappingException;
}

// Property writer base
public abstract class PropertyWriter implements BeanProperty {
    public abstract void serializeAsField(Object value, JsonGenerator gen, SerializerProvider prov) throws Exception;
    public abstract void serializeAsOmittedField(Object value, JsonGenerator gen, SerializerProvider prov) throws Exception;
    public abstract void serializeAsElement(Object value, JsonGenerator gen, SerializerProvider prov) throws Exception;
    public void serializeAsPlaceholder(Object value, JsonGenerator gen, SerializerProvider prov) throws Exception;
    public abstract void depositSchemaProperty(JsonObjectFormatVisitor v, SerializerProvider provider) throws JsonMappingException;
}

// Serializer cache
public final class SerializerCache {
    public int cachedSerializersCount();
    public void flushCachedSerializers();
    public JsonSerializer<Object> untypedValueSerializer(Class<?> type);
    public JsonSerializer<Object> untypedValueSerializer(JavaType type);
    public ReadOnlyClassToSerializerMap getReadOnlyLookupMap();
}

// Serializer registration interface
public interface Serializers {
    JsonSerializer<?> findSerializer(SerializationConfig config, JavaType type, BeanDescription beanDesc);
    JsonSerializer<?> findReferenceSerializer(SerializationConfig config, ReferenceType type, BeanDescription beanDesc, TypeSerializer contentTypeSerializer, JsonSerializer<Object> contentValueSerializer);
    JsonSerializer<?> findArraySerializer(SerializationConfig config, ArrayType type, BeanDescription beanDesc, TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer);
    JsonSerializer<?> findCollectionSerializer(SerializationConfig config, CollectionType type, BeanDescription beanDesc, TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer);
    JsonSerializer<?> findCollectionLikeSerializer(SerializationConfig config, CollectionLikeType type, BeanDescription beanDesc, TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer);
    JsonSerializer<?> findMapSerializer(SerializationConfig config, MapType type, BeanDescription beanDesc, JsonSerializer<Object> keySerializer, TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer);
    JsonSerializer<?> findMapLikeSerializer(SerializationConfig config, MapLikeType type, BeanDescription beanDesc, JsonSerializer<Object> keySerializer, TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer);
    
    public abstract static class Base implements Serializers {
        // Default implementations returning null
    }
}

// Bean serializer modifier
public abstract class BeanSerializerModifier {
    public List<BeanPropertyWriter> changeProperties(SerializationConfig config, BeanDescription beanDesc, List<BeanPropertyWriter> beanProperties);
    public List<BeanPropertyWriter> orderProperties(SerializationConfig config, BeanDescription beanDesc, List<BeanPropertyWriter> beanProperties);
    public BeanSerializerBuilder updateBuilder(SerializationConfig config, BeanDescription beanDesc, BeanSerializerBuilder builder);
    public JsonSerializer<?> modifySerializer(SerializationConfig config, BeanDescription beanDesc, JsonSerializer<?> serializer);
    public JsonSerializer<?> modifyArraySerializer(SerializationConfig config, ArrayType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer);
    public JsonSerializer<?> modifyCollectionSerializer(SerializationConfig config, CollectionType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer);
    public JsonSerializer<?> modifyCollectionLikeSerializer(SerializationConfig config, CollectionLikeType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer);
    public JsonSerializer<?> modifyMapSerializer(SerializationConfig config, MapType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer);
    public JsonSerializer<?> modifyMapLikeSerializer(SerializationConfig config, MapLikeType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer);
    public JsonSerializer<?> modifyEnumSerializer(SerializationConfig config, JavaType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer);
    public JsonSerializer<?> modifyKeySerializer(SerializationConfig config, JavaType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer);
}