JacksonConverter.java

/**
 * $Id: $
 * $Date: $
 * 
 */

package org.xmlsh.json;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.xmlsh.core.SafeXMLStreamWriter;
import org.xmlsh.core.XValue;
import org.xmlsh.sh.shell.SerializeOpts;
import org.xmlsh.util.Util;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.TreeNode;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import com.fasterxml.jackson.dataformat.xml.deser.FromXmlParser;
import com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator;

public class JacksonConverter extends JXConverter
{
    public static Logger mLogger = LogManager.getLogger();

    public JacksonConverter(
            SerializeOpts serializeOpts, List<XValue> mArgs)
    {
        super( serializeOpts, mArgs);
    }

    protected XmlMapper getXmlMapper() {
        XmlMapper xmlMapper = JSONUtils.newXmlMapper();
        xmlMapper
                .setPropertyNamingStrategy(PropertyNamingStrategy.CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES);
        return xmlMapper;
    }

    class JSONConverter implements IJSONConverter {

        private JsonGenerator mGenerator;
        private FromXmlParser mParser;

        protected JSONConverter(XMLStreamReader reader, OutputStream os)
                throws ConverterException
        {
            super();
            try {
                mParser =  getXmlMapper().getFactory().createParser(reader);
                mGenerator = JSONUtils.createGenerator( os,getSerializeOpts() );
            } catch (IOException e) {
                throw new ConverterException(e);
            }
        }

        @Override
        public boolean parse() throws ConverterException
        {
            try  {
                TreeNode tree = mParser.readValueAsTree();
                mGenerator.writeTree(tree);
                return true;
            } catch (IOException e) {
                throw new ConverterException(e);
            }

        }

        @Override
        public void close() throws ConverterException
        {
            JSONUtils.safeClose(mGenerator);
            JSONUtils.safeClose(mParser);
            mGenerator = null;
            mParser = null;

        }

    }

    class XMLConverter implements IXMLConverter {

        JsonParser mParser;
        InputStream mInput;
        XMLStreamWriter mWriter;
        ToXmlGenerator mGenerator;

        protected XMLConverter(InputStream is, XMLStreamWriter sw)
                throws ConverterException
        {
            mInput = is;
            mWriter = new SafeXMLStreamWriter(new XMLRewritingStreamWriter(sw));

            try {
                mParser = JSONUtils.getJsonFactory().createParser(is);
                XmlMapper xmlMapper = getXmlMapper();
                mGenerator = xmlMapper.getFactory().createGenerator(mWriter);
            } catch (JsonParseException e) {
                throw new ConverterException(e);
            } catch (IOException e) {
                throw new ConverterException(e);
            }

        }

        @Override
        public boolean parse() throws ConverterException
        {
            try {

                TreeNode tree = mParser.readValueAsTree();
                mGenerator.writeTree(tree);

                /*
                 * mParser.nextToken();
                 * mGenerator.copyCurrentStructure(mParser);
                 */
                return true;
            } catch (IOException e) {
                throw new ConverterException(e);
            }
        }

        @Override
        public void close() throws ConverterException
        {
            JSONUtils.safeClose(mGenerator);
            JSONUtils.safeClose(mParser);
            Util.safeClose(mWriter);
            mGenerator = null;
            mParser = null;
            mWriter = null;
        }

    }

    @Override
    IJSONConverter newJConverter(XMLStreamReader reader, OutputStream os)
            throws ConverterException
    {
        return new JSONConverter(reader, os);
    }

    @Override
    IXMLConverter newXMLConverter(InputStream is, XMLStreamWriter sw)
            throws ConverterException
    {
        return new XMLConverter(is, sw);
    }

}

/*
 * Copyright (C) 2008-2012 David A. Lee.
 * 
 * The contents of this file are subject to the "Simplified BSD License" (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.opensource.org/licenses/bsd-license.php
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 * 
 * The Original Code is: all this file.
 * 
 * The Initial Developer of the Original Code is David A. Lee
 * 
 * Portions created by (your name) are Copyright (C) (your legal entity). All
 * Rights Reserved.
 * 
 * Contributor(s): David A. Lee
 */