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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, BeanProperty property)
    {
        super(Iterable.class, elemType, staticTyping, vts, property, null);
    }

    public IterableSerializer(IterableSerializer src, BeanProperty property,
            TypeSerializer vts, JsonSerializer valueSerializer)
    {
        super(src, property, vts, valueSerializer);
    }
    
    @Override
    public ContainerSerializer _withValueTypeSerializer(TypeSerializer vts) {
        return new IterableSerializer(_elementType, _staticTyping, vts, _property);
    }

    @Override
    public IterableSerializer withResolved(BeanProperty property,
            TypeSerializer vts, JsonSerializer elementSerializer) {
        return new IterableSerializer(this, property, vts, elementSerializer);
    }
    
    @Override
    public boolean isEmpty(SerializerProvider prov, Iterable value) {
        // Not really good way to implement this, but has to do for now:
        return (value == null) || !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 jgen, SerializerProvider provider) throws IOException
    {
        if (provider.isEnabled(SerializationFeature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED) && hasSingleElement(value)) {
            serializeContents(value, jgen, provider);
            return;
        }
        jgen.writeStartArray();
        serializeContents(value, jgen, provider);
        jgen.writeEndArray();
    }
    
    @Override
    public void serializeContents(Iterable value, JsonGenerator jgen, SerializerProvider provider)
        throws IOException, JsonGenerationException
    {
        Iterator it = value.iterator();
        if (it.hasNext()) {
            final TypeSerializer typeSer = _valueTypeSerializer;
            JsonSerializer