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

Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/ser/impl/IteratorSerializer.java

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

import java.io.IOException;
import java.util.Iterator;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.ContainerSerializer;
import com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase;

@SuppressWarnings("serial")
@JacksonStdImpl
public class IteratorSerializer
    extends AsArraySerializerBase<Iterator<?>>
{
    public IteratorSerializer(JavaType elemType, boolean staticTyping, TypeSerializer vts) {
        super(Iterator.class, elemType, staticTyping, vts, null);
    }

    public IteratorSerializer(IteratorSerializer src,
            BeanProperty property, TypeSerializer vts, JsonSerializer<?> valueSerializer,
            Boolean unwrapSingle) {
        super(src, property, vts, valueSerializer, unwrapSingle);
    }

    @Override
    public boolean isEmpty(SerializerProvider prov, Iterator<?> value) {
        return !value.hasNext();
    }

    @Override
    public boolean hasSingleElement(Iterator<?> value) {
        // no really good way to determine (without consuming iterator), so:
        return false;
    }
    
    @Override
    public ContainerSerializer<?> _withValueTypeSerializer(TypeSerializer vts) {
        return new IteratorSerializer(this, _property, vts, _elementSerializer, _unwrapSingle);
    }

    @Override
    public IteratorSerializer withResolved(BeanProperty property,
            TypeSerializer vts, JsonSerializer<?> elementSerializer,
            Boolean unwrapSingle) {
        return new IteratorSerializer(this, property, vts, elementSerializer, unwrapSingle);
    }

    @Override
    public final void serialize(Iterator<?> value, JsonGenerator gen,
            SerializerProvider provider) throws IOException
    {
        // 02-Dec-2016, tatu: As per comments above, can't determine single element so...
        /*
        if (((_unwrapSingle == null) &&
                provider.isEnabled(SerializationFeature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED))
                || (_unwrapSingle == Boolean.TRUE)) {
            if (hasSingleElement(value)) {
                serializeContents(value, gen, provider);
                return;
            }
        }
        */
        gen.writeStartArray(value);
        serializeContents(value, gen, provider);
        gen.writeEndArray();
    }
    
    @Override
    public void serializeContents(Iterator<?> value, JsonGenerator g,
            SerializerProvider provider) throws IOException
    {
        if (!value.hasNext()) {
            return;
        }
        JsonSerializer<Object> serializer = _elementSerializer;
        if (serializer == null) {
            _serializeDynamicContents(value, g, provider);
            return;
        }
        final TypeSerializer typeSer = _valueTypeSerializer;
        do {
            Object elem = value.next();
            if (elem == null) {
                provider.defaultSerializeNull(g);
            } else if (typeSer == null) {
                serializer.serialize(elem, g, provider);
            } else {
                serializer.serializeWithType(elem, g, provider, typeSer);
            }
        } while (value.hasNext());
    }
    
    protected void _serializeDynamicContents(Iterator<?> value, JsonGenerator g,
            SerializerProvider provider) throws IOException
    {
        final TypeSerializer typeSer = _valueTypeSerializer;
        PropertySerializerMap serializers = _dynamicSerializers;
        do {
            Object elem = value.next();
            if (elem == null) {
                provider.defaultSerializeNull(g);
                continue;
            }
            Class<?> cc = elem.getClass();
            JsonSerializer<Object> serializer = serializers.serializerFor(cc);
            if (serializer == null) {
                if (_elementType.hasGenericTypes()) {
                    serializer = _findAndAddDynamic(serializers,
                            provider.constructSpecializedType(_elementType, cc), provider);
                } else {
                    serializer = _findAndAddDynamic(serializers, cc, provider);
                }
                serializers = _dynamicSerializers;
            }
            if (typeSer == null) {
                serializer.serialize(elem, g, provider);
            } else {
                serializer.serializeWithType(elem, g, provider, typeSer);
            }
        } while (value.hasNext());
    }
}

⏎ com/fasterxml/jackson/databind/ser/impl/IteratorSerializer.java

Or download all of them as a single archive file:

File name: jackson-databind-2.14.0-sources.jar
File size: 1187952 bytes
Release date: 2022-11-05
Download 

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⇑⇑ Jackson - Java JSON library