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

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package com.fasterxml.jackson.databind.ext;

import java.io.IOException;

import org.w3c.dom.Node;
import  org.w3c.dom.bootstrap.DOMImplementationRegistry;
import  org.w3c.dom.ls.DOMImplementationLS;
import  org.w3c.dom.ls.LSSerializer;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

@SuppressWarnings("serial")
public class DOMSerializer extends StdSerializer
{
    protected final DOMImplementationLS _domImpl;

    public DOMSerializer() {
        super(Node.class);
        DOMImplementationRegistry registry;
        try {
            registry = DOMImplementationRegistry.newInstance();
        } catch (Exception e) {
            throw new IllegalStateException("Could not instantiate DOMImplementationRegistry: "+e.getMessage(), e);
        }
        _domImpl = (DOMImplementationLS)registry.getDOMImplementation("LS");
    }
    
    @Override
    public void serialize(Node value, JsonGenerator jgen, SerializerProvider provider)
        throws IOException, JsonGenerationException
    {
        if (_domImpl == null) throw new IllegalStateException("Could not find DOM LS");    	
        LSSerializer writer = _domImpl.createLSSerializer();
        jgen.writeString(writer.writeToString(value));
    }

	@Override
    public JsonNode getSchema(SerializerProvider provider, java.lang.reflect.Type typeHint) {
        // Well... it is serialized as String
        return createSchemaNode("string", true);
    }

    @Override
    public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException {
        if (visitor != null) visitor.expectAnyFormat(typeHint);
    }
}