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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>
{
    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