com.rpeactual.json2xml.JSON2XML.java Source code

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Here is the source code for com.rpeactual.json2xml.JSON2XML.java

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/*******************************************************************************
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE 
 * OR OTHER DEALINGS IN THE SOFTWARE.
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package com.rpeactual.json2xml;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringWriter;

import org.apache.commons.io.IOUtils;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.impl.inst2xsd.Inst2Xsd;
import org.apache.xmlbeans.impl.inst2xsd.Inst2XsdOptions;
import org.apache.xmlbeans.impl.xb.xsdschema.SchemaDocument;
import org.json.JSONObject;

/**
 * Utility to convert JSON to XML
 * 
 * @author Dragos Cojocari
 *
 */
public class JSON2XML {
    private static final String UTF_8 = "UTF-8";

    /**
     * Takes an JSON input stream and returns an XML output stream 
     * 
     * @param inputStream
     * @param outputStream
     * @throws IOException
     * @throws XmlException 
     */
    public void json2xml(InputStream jsonStream, String outputFolder) throws IOException, XmlException {
        StringWriter writer = new StringWriter();
        IOUtils.copy(jsonStream, writer, UTF_8);
        String jsonStr = writer.toString();

        JSONObject o = new JSONObject(jsonStr);

        String xml = org.json.XML.toString(o);

        File xmlFile = new File(outputFolder, "output.xml");
        OutputStream xmlStream = new FileOutputStream(xmlFile);

        IOUtils.write(xml, xmlStream, UTF_8);

        File xsdFile = new File(outputFolder, "output.xsd");
        xml2xsd(xmlFile.getAbsolutePath(), xsdFile.getAbsolutePath());
    }

    public void xml2xsd(String xmlPath, String pathToSaveXSD) throws XmlException, IOException {
        Inst2XsdOptions inst2XsdOptions = new Inst2XsdOptions();
        inst2XsdOptions.setDesign(Inst2XsdOptions.DESIGN_RUSSIAN_DOLL);

        File[] xmlFiles = new File[1];
        xmlFiles[0] = new File(xmlPath);

        XmlObject[] xmlInstance = new XmlObject[1];
        xmlInstance[0] = XmlObject.Factory.parse(xmlFiles[0]);

        SchemaDocument[] schemaDocuments = Inst2Xsd.inst2xsd(xmlInstance, inst2XsdOptions);
        if (schemaDocuments != null && schemaDocuments.length > 0) {
            SchemaDocument schema = schemaDocuments[0];
            String schemaStr = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"; //$NON-NLS-1$
            if (!schema.toString().startsWith(schemaStr)) {
                schemaStr += schema.toString();
            } else {
                schemaStr = schema.toString();
            }

            IOUtils.write(schemaStr, new FileOutputStream(pathToSaveXSD), UTF_8);
        }
    }

    public static void main(String[] args) throws IOException, XmlException {
        if (args.length != 2) {
            System.err
                    .println("Invalid number of arguments. Syntax is: json2xml <jsonInputFile> <xmlOutputFolder>");
            return;
        }

        InputStream jsonStream = new FileInputStream(new File(args[0]));

        new JSON2XML().json2xml(jsonStream, args[1]);
    }

}