Jackson Data Binding Source Code

Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

  • Jackson Data Binding module allows you to converts JSON to and from POJO (Plain Old Java Object) using property accessor or using annotations.
  • Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.12.4-sources.jar). You can download it at Jackson Maven Website.

    You can also browse Jackson Databind Source Code below:

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    com/fasterxml/jackson/databind/ser/std/StaticListSerializerBase.java

    package com.fasterxml.jackson.databind.ser.std;
    
    import java.io.IOException;
    import java.lang.reflect.Type;
    import java.util.*;
    import java.util.Objects;
    
    import com.fasterxml.jackson.annotation.JsonFormat;
    
    import com.fasterxml.jackson.core.JsonGenerator;
    
    import com.fasterxml.jackson.databind.*;
    import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
    import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonArrayFormatVisitor;
    import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
    import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
    import com.fasterxml.jackson.databind.ser.ContextualSerializer;
    
    /**
     * Intermediate base class for Lists, Collections and Arrays
     * that contain static (non-dynamic) value types.
     */
    @SuppressWarnings("serial")
    public abstract class StaticListSerializerBase<T extends Collection<?>>
        extends StdSerializer<T>
        implements ContextualSerializer
    {
        /**
         * Setting for specific local override for "unwrap single element arrays":
         * true for enable unwrapping, false for preventing it, `null` for using
         * global configuration.
         *
         * @since 2.6
         */
        protected final Boolean _unwrapSingle;
    
        protected StaticListSerializerBase(Class<?> cls) {
            super(cls, false);
            _unwrapSingle = null;
        }
    
        /**
         * @since 2.9
         */
        protected StaticListSerializerBase(StaticListSerializerBase<?> src,
                Boolean unwrapSingle) {
            super(src);
            _unwrapSingle = unwrapSingle;
        }
    
        /**
         * @since 2.9
         */
        public abstract JsonSerializer<?> _withResolved(BeanProperty prop,
                Boolean unwrapSingle);
    
        /*
        /**********************************************************
        /* Post-processing
        /**********************************************************
         */
    
        @SuppressWarnings("unchecked")
        @Override
        public JsonSerializer<?> createContextual(SerializerProvider serializers,
                BeanProperty property)
            throws JsonMappingException
        {
            JsonSerializer<?> ser = null;
            Boolean unwrapSingle = null;
            
            if (property != null) {
                final AnnotationIntrospector intr = serializers.getAnnotationIntrospector();
                AnnotatedMember m = property.getMember();
                if (m != null) {
                    Object serDef = intr.findContentSerializer(m);
                    if (serDef != null) {
                        ser = serializers.serializerInstance(m, serDef);
                    }
                }
            }
            JsonFormat.Value format = findFormatOverrides(serializers, property, handledType());
            if (format != null) {
                unwrapSingle = format.getFeature(JsonFormat.Feature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED);
            }
            // [databind#124]: May have a content converter
            ser = findContextualConvertingSerializer(serializers, property, ser);
            if (ser == null) {
                ser = serializers.findContentValueSerializer(String.class, property);
            }
            // Optimization: default serializer just writes String, so we can avoid a call:
            if (isDefaultSerializer(ser)) {
                if (Objects.equals(unwrapSingle, _unwrapSingle)) {
                    return this;
                }
                return _withResolved(property, unwrapSingle);
            }
            // otherwise...
            // note: will never have TypeSerializer, because Strings are "natural" type
            return new CollectionSerializer(serializers.constructType(String.class),
                    true, /*TypeSerializer*/ null, (JsonSerializer<Object>) ser);
        }
    
        @Override
        public boolean isEmpty(SerializerProvider provider, T value) {
            return (value == null) || (value.size() == 0);
        }
    
        @Override
        public JsonNode getSchema(SerializerProvider provider, Type typeHint) {
            return createSchemaNode("array", true).set("items", contentSchema());
        }
    
        @Override
        public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException {
            JsonArrayFormatVisitor v2 = visitor.expectArrayFormat(typeHint);
            if (v2 != null) {
                acceptContentVisitor(v2);
            }
        }
    
        /*
        /**********************************************************
        /* Abstract methods for sub-classes to implement
        /**********************************************************
         */
    
        protected abstract JsonNode contentSchema();
    
        protected abstract void acceptContentVisitor(JsonArrayFormatVisitor visitor)
            throws JsonMappingException;
    
        // just to make sure it gets implemented:
        @Override
        public abstract void serializeWithType(T value, JsonGenerator g,
                SerializerProvider provider, TypeSerializer typeSer) throws IOException;
    }
    

    com/fasterxml/jackson/databind/ser/std/StaticListSerializerBase.java

     

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