package com.nbtconsulting.demo.restws.v2007.model.web.view;

import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.View;
import org.apache.commons.io.IOUtils;
import java.io.OutputStream;

//---------------------------------------------------------
//---------------------------------------------------------
/**
Output text (from a String) as a view representation.
<br />
<br />

This view will look for a key named 
<strong>&quot;content&quot;</strong> 
in the model.  
This view will use the value for a key named 
<strong>&quot;content&quot;</strong> 
in the model as the view representation. 

<br />
<br />
Example Groovy code:

<code>

StringBuffer sbuff = new StringBuffer()
sbuff << "some message here"

View view = new XmlView()
Map myMap = [:]
myMap["text"] = sbuff.toString

ModelAndView mav = new ModelAndView(view, myMap)
return mav

</code>


*/
public class XmlView
	implements View
{
//Log log = LogFactory.getLog(XmlView.class);
static org.apache.commons.logging.Log logger =
	org.apache.commons.logging.LogFactory.getLog(XmlView.class);

//protected static String STR_DEFAULT_CONTENT_TYPE = "text/xml"; 
protected static String STR_DEFAULT_CONTENT_TYPE = "application/xml"; 
protected String strContentType = STR_DEFAULT_CONTENT_TYPE;

//---------------------------------------------------------
public String getContentType()
{
return strContentType;
}

//---------------------------------------------------------
public void setContentType(String strContentType)
{
this.strContentType = strContentType;
}

//---------------------------------------------------------
/**
Will look for the value (view content) with the key of "content"
or "xml" or "text" (in order) in the model.

The content will be sent to the HttpServletResponse output.
*/
public void render(Map model, HttpServletRequest request,
	HttpServletResponse response) throws Exception
{
logger.debug("entered");

Object objResponseContent = "";
if (model != null)
	{
	// Retrieve data from model
	objResponseContent = model.get("content");
	/*
	if (objResponseContent == null)
   	{
   	objResponseContent = model.get("xml");
   	}
  	if (objResponseContent == null)
   	{
   	objResponseContent = model.get("text");
   	}
   */
	if (objResponseContent == null)
		{
		objResponseContent = "";
		}
	}

response.setContentType(getContentType());

// Write the content document to the HttpServletResponse output stream
OutputStream out = response.getOutputStream();

if (objResponseContent instanceof byte[])
	{
	IOUtils.write((byte[]) objResponseContent, out);
	response.setContentLength(((byte[]) objResponseContent).length);
   }
else if (objResponseContent instanceof String)
   {
   IOUtils.write((String) objResponseContent, out);
	response.setContentLength(((String) objResponseContent).length());
   }
else if (objResponseContent instanceof StringBuffer)
	{
   IOUtils.write((StringBuffer) objResponseContent, out);
	response.setContentLength(((StringBuffer) objResponseContent).length());
   }
else if (objResponseContent instanceof char[])
	{
	IOUtils.write((char[]) objResponseContent, out);
	response.setContentLength(((char[]) objResponseContent).length);
	}
else
	{
	throw new RuntimeException("content type is not handled by this view");
	}
}

}