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General data-binding functionality for Jackson: works on core streaming API

There is a newer version: 2.17.0

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

import java.io.IOException;
import java.util.*;

import com.fasterxml.jackson.core.*;
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;

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

    public IterableSerializer(IterableSerializer src, BeanProperty property,
            TypeSerializer vts, JsonSerializer valueSerializer,
            Boolean unwrapSingle) {
        super(src, property, vts, valueSerializer, unwrapSingle);
    }

    @Override
    public ContainerSerializer _withValueTypeSerializer(TypeSerializer vts) {
        return new IterableSerializer(this, _property, vts, _elementSerializer, _unwrapSingle);
    }

    @Override
    public IterableSerializer withResolved(BeanProperty property,
            TypeSerializer vts, JsonSerializer elementSerializer,
            Boolean unwrapSingle) {
        return new IterableSerializer(this, property, vts, elementSerializer, unwrapSingle);
    }
    
    @Override
    public boolean isEmpty(SerializerProvider prov, Iterable value) {
        // Not really good way to implement this, but has to do for now:
        return !value.iterator().hasNext();
    }

    @Override
    public boolean hasSingleElement(Iterable value) {
        // we can do it actually (fixed in 2.3.1)
        if (value != null) {
            Iterator it = value.iterator();
            if (it.hasNext()) {
                it.next();
                if (!it.hasNext()) {
                    return true;
                }
            }
        }
        return false;
    }

    @Override
    public final void serialize(Iterable value, JsonGenerator gen,
        SerializerProvider provider)throws IOException
    {
        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(Iterable value, JsonGenerator jgen,
        SerializerProvider provider) throws IOException
    {
        Iterator it = value.iterator();
        if (it.hasNext()) {
            final TypeSerializer typeSer = _valueTypeSerializer;
            JsonSerializer