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Extension for Jackson (http://jackson.codehaus.org) to offer alternative support for serializing POJOs as XML and deserializing XML as pojos. Support implemented on top of Stax API (javax.xml.stream), by implementing core Jackson Streaming API types like JsonGenerator, JsonParser and JsonFactory. Some data-binding types overridden as well (ObjectMapper sub-classed as XmlMapper).

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package com.fasterxml.jackson.xml.util;

import java.io.IOException;

import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.PrettyPrinter;

import com.fasterxml.jackson.xml.ser.ToXmlGenerator;

/**
 * Indentation to use with XML is different from JSON, because JSON
 * requires use of separator characters and XML just basic whitespace.
 * 
 * @since 1.7
 */
public class DefaultXmlPrettyPrinter
    implements PrettyPrinter
{
    /*
    /**********************************************************
    /* Root-level values
    /**********************************************************
     */

    //@Override
    public void writeRootValueSeparator(JsonGenerator jgen) throws IOException, JsonGenerationException {
        // Not sure if this should ever be applicable; but if multiple roots were allowed, we'd use linefeed
        jgen.writeRaw('\n');
    }
    
    /*
    /**********************************************************
    /* Array values
    /**********************************************************
     */
    
    //@Override
    public void beforeArrayValues(JsonGenerator jgen) throws IOException, JsonGenerationException {
        // anything to do here?
    }

    //@Override
    public void writeStartArray(JsonGenerator jgen) throws IOException, JsonGenerationException {
        // anything to do here?
    }

    //@Override
    public void writeArrayValueSeparator(JsonGenerator jgen)  throws IOException, JsonGenerationException {
        // all markup by elements, no separators; nothing to do here
    }

    //@Override
    public void writeEndArray(JsonGenerator jgen, int nrOfValues) throws IOException, JsonGenerationException {
        // anything to do here?
    }
    
    /*
    /**********************************************************
    /* Object values
    /**********************************************************
     */
    
    //@Override
    public void beforeObjectEntries(JsonGenerator jg)  throws IOException, JsonGenerationException {
        // TODO Auto-generated method stub
    }

    //@Override
    public void writeStartObject(JsonGenerator jgen) throws IOException, JsonGenerationException {
        ((ToXmlGenerator) jgen)._handleStartObject();
    }

    //@Override
    public void writeObjectEntrySeparator(JsonGenerator jg) throws IOException, JsonGenerationException {
        // all markup by elements, no separators; nothing to do here
    }

    //@Override
    public void writeObjectFieldValueSeparator(JsonGenerator jg) throws IOException, JsonGenerationException {
        // all markup by elements, no separators; nothing to do here
    }
    
    //@Override
    public void writeEndObject(JsonGenerator jgen, int nrOfEntries) throws IOException, JsonGenerationException {
        ((ToXmlGenerator) jgen)._handleEndObject();
    }
}