org.mule.module.json.transformers.JsonToXml Maven / Gradle / Ivy

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/*
 * $Id: JsonToXml.java 23166 2011-10-13 00:27:53Z mike.schilling $
 * --------------------------------------------------------------------------------------
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 *
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.module.json.transformers;

import org.mule.api.transformer.TransformerException;
import org.mule.transformer.types.DataTypeFactory;
import org.mule.util.IOUtils;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.transform.Source;
import javax.xml.transform.stax.StAXSource;
import java.io.File;
import java.io.Reader;
import java.io.StringWriter;
import java.net.URL;

import de.odysseus.staxon.json.JsonXMLInputFactory;

/**
 * Convert JSON to an XML document string
 */
public class JsonToXml extends AbstractToFromXmlTransformer
{
    public JsonToXml()
    {
        this.registerSourceType(DataTypeFactory.STRING);
        this.registerSourceType(DataTypeFactory.INPUT_STREAM);
        this.registerSourceType(DataTypeFactory.BYTE_ARRAY);
        this.registerSourceType(DataTypeFactory.create(Reader.class));
        this.registerSourceType(DataTypeFactory.create(URL.class));
        this.registerSourceType(DataTypeFactory.create(File.class));
        setReturnDataType(DataTypeFactory.XML_STRING);
    }


    /**
     * Use Staxon to convert JSON to an XML string
     */
    @Override
    protected Object doTransform(Object src, String enc) throws TransformerException
    {
        XMLInputFactory inputFactory = new JsonXMLInputFactory();
        inputFactory.setProperty(JsonXMLInputFactory.PROP_MULTIPLE_PI, false);
        TransformerInputs inputs = new TransformerInputs(this,src);
        Source source;
        try
        {
            if (inputs.getInputStream() != null)
            {
                source = new StAXSource(inputFactory.createXMLStreamReader(inputs.getInputStream(), enc == null ? "UTF-8" : enc));
            }
            else
            {
                source = new StAXSource(inputFactory.createXMLStreamReader(inputs.getReader()));
            }

            XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
            return convert(source, outputFactory);
        }
        catch (Exception ex)
        {
            throw new TransformerException(this, ex);
        }
        finally
        {
            IOUtils.closeQuietly(inputs.getInputStream());
            IOUtils.closeQuietly(inputs.getReader());
        }
    }
}