/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements. See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership. The ASF licenses this file

  * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied. See the License for the

  * specific language governing permissions and limitations under the License.

  */

 package org.apache.shindig.social.core.util;

 import org.apache.shindig.social.opensocial.service.BeanConverter;

 import org.apache.commons.betwixt.IntrospectionConfiguration;

 import org.apache.commons.betwixt.io.BeanReader;

 import org.apache.commons.betwixt.io.BeanWriter;

 import org.xml.sax.SAXException;

 import java.beans.IntrospectionException;

 import java.io.IOException;

 import java.io.StringReader;

 import java.io.StringWriter;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 // TODO: This does not produce valid atom sytnax yet

 public class BeanAtomConverter implements BeanConverter {

   private static Logger logger =

       Logger.getLogger(BeanAtomConverter.class.getName());

   public String getContentType() {

     return "application/atom+xml";

   }

   public String convertToString(Object pojo) {

     return convertToXml(pojo);

   }

   public String convertToXml(Object obj) {

     String xmlHead="<?xml version=\"1.0\" encoding=\"UTF-8\"?>";

     StringWriter outputWriter = new StringWriter();

     BeanWriter writer = new BeanWriter(outputWriter);

     IntrospectionConfiguration configuration = writer.getXMLIntrospector().getConfiguration();

     configuration.setAttributesForPrimitives(false);

     configuration.setWrapCollectionsInElement(true);

     writer.getBindingConfiguration().setMapIDs(false);

     // Print no line endings

     writer.setEndOfLine("");

     writer.setWriteEmptyElements(false);

     // Still left to do:

     //

     // Fix map output with custom outputter:

     // for a map with {key : value, key2 : value2} we need:

     // <key>value</key> <key2>value2</key2>

     // Supress empty lists

     // Within a list the items need to be renamed - this probably means with need a .betwixt file

     String toReturn = xmlHead;

     try {

       writer.write("response", obj);

       toReturn =toReturn+ outputWriter.toString();

       logger.finest("XML is: " + toReturn + "\n **** \n\n");

     } catch (SAXException e) {

       logger.log(Level.SEVERE, e.getMessage(), e);

     } catch (IOException e) {

       logger.log(Level.SEVERE, e.getMessage(), e);

     } catch (IntrospectionException e) {

       logger.log(Level.SEVERE, e.getMessage(), e);

     } finally {

       try {

         writer.close();

       } catch (IOException e) {

         logger.log(Level.FINEST, e.getMessage(), e);

       }

     }

     return toReturn;

   }

   public <T> T convertToObject(String xml, Class<T> className) {

     String errorMessage = "Could not convert " + xml + " to " + className;

     xml=xml.substring(xml.indexOf("?>") + 2);

     BeanReader reader = new BeanReader();

     try {

       reader.registerBeanClass("activity", className);

       StringReader rd = new StringReader(xml);

       return (T) reader.parse(rd);

     } catch (IntrospectionException e) {

       throw new RuntimeException(errorMessage, e);

     } catch (IOException e) {

       throw new RuntimeException(errorMessage, e);

     } catch (SAXException e) {

       throw new RuntimeException(errorMessage, e);

     }

   }

 }