package com.aurea.maven.plugins.sonic.sdo;

 import java.io.ByteArrayOutputStream;

 import java.io.File;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.HashMap;

 import org.apache.tuscany.sdo.util.SDOUtil;

 import com.aurea.maven.plugins.sonic.utils.FileUtilities;

 import commonj.sdo.DataObject;

 import commonj.sdo.helper.HelperContext;

 import commonj.sdo.helper.XMLDocument;

 import commonj.sdo.helper.XMLHelper;

 /**

  *

  */

 @SuppressWarnings("deprecation")

 public abstract class AbstractDataObjectInstance implements IDataObjectInstance {

   private DataObject                            object = null;

   private static HashMap<String, HelperContext> HELPER_CONTEXT     = null;

   /**

    * @return String

    */

   protected abstract String getResourceLocation();

   /**

    * @return String

    */

   protected abstract String getNamespace();

   /**

    * @return String

    */

   protected abstract String getXSDType();

   /**

    * @return HelperContext

    * @throws Exception

    *           Exception

    */

   protected final synchronized HelperContext getHelperContext() throws Exception {

     if (HELPER_CONTEXT.get(getResourceLocation()) == null) {

       HelperContext ctxt = SDOUtil.createHelperContext();

       InputStream is = AbstractDataObjectInstance.class.getClassLoader().getResourceAsStream(getResourceLocation());

       ctxt.getXSDHelper().define(is, getResourceLocation());

       HELPER_CONTEXT.put(getResourceLocation(), ctxt);

     }

     return HELPER_CONTEXT.get(getResourceLocation());

   }

   /**

    * @param _is

    *          _is

    * @throws Exception

    *           Exception

    */

   public final void load(final InputStream _is) throws Exception {

     if (object != null) {

       object.delete();

       object = null;

     }

     try {

       XMLDocument doc = getHelperContext().getXMLHelper().load(_is);

       object = doc.getRootObject();

     } catch (IOException ioe) {

       ioe.printStackTrace();

       throw new Exception("Could not load DataObject ");

     }

   }

   /**

    * @param _dest

    *          _dest

    * @throws Exception

    *           Exception

    */

   public final void save(final File _dest) throws Exception {

     FileUtilities.writeFile(toString().getBytes(), _dest.getAbsolutePath());

   }

   /**

    * @return DataObject

    */

   public final DataObject getDataObject() {

     if (object == null) {

       try {

         HelperContext localHc = getHelperContext();

         object = localHc.getDataFactory().create(getNamespace(), getXSDType());

       } catch (Exception e) {

         e.printStackTrace();

       }

     }

     return object;

   }

   /**

    * @return String

    */

   public final String toString() {

     String result = null;

     try {

       ByteArrayOutputStream bos = new ByteArrayOutputStream();

       XMLHelper helper = getHelperContext().getXMLHelper();

       helper.save(getDataObject(), getNamespace(), getXSDType(), bos);

       result = new String(bos.toByteArray());

     } catch (Exception e) {

       // TODO: handle this

     }

     return result;

   }

   static {

     HELPER_CONTEXT = new HashMap<String, HelperContext>();

   }

 }