/*
* Copyright 2005-2008 Original author or authors
*
* Licensed 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.directwebremoting.jsp;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import org.directwebremoting.Container;
import org.directwebremoting.ScriptBuffer;
import org.directwebremoting.ServerContextFactory;
import org.directwebremoting.WebContextFactory;
import org.directwebremoting.extend.ConverterManager;
import org.directwebremoting.extend.ScriptBufferUtil;
/**
* JSP tag to convert an object into javascript using the dwr converter manager
* Example usage:
* <%@ taglib uri="http://directwebremoting.org/dwr/" prefix="dwr" %>
* <script%>
* var clientsideObject = <dwr:convert value="${myServersideObject}" /%>;
* </script%>
*
* @author Lance Semmens <uklance at gmail dot com>
*/
public class ConvertTag extends TagSupport
{
/* (non-Javadoc)
* @see javax.servlet.jsp.tagext.TagSupport#doEndTag()
*/
@Override
public int doEndTag() throws JspException
{
try
{
Container container = ServerContextFactory.get().getContainer();
ConverterManager converterManager = container.getBean(ConverterManager.class);
HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
HttpServletResponse response = (HttpServletResponse) pageContext.getResponse();
WebContextFactory.WebContextBuilder contextBuilder = container.getBean(WebContextFactory.WebContextBuilder.class);
contextBuilder.engageThread(container, request, response);
try
{
if (json)
{
ScriptBuffer buffy = new ScriptBuffer();
buffy.appendData(value);
pageContext.getOut().write(ScriptBufferUtil.createOutput(buffy, converterManager, true));
}
else
{
ScriptBuffer buffy = new ScriptBuffer();
buffy.appendScript("return ").appendData(value).appendScript(";");
// wrap in a closure so that we don't pollute the javascript namespace with loads of variables
pageContext.getOut().write(
"(function() { " +
ScriptBufferUtil.createOutput(buffy, converterManager, false) +
" })();"
);
}
}
finally
{
// clean up the thread local
contextBuilder.disengageThread();
}
return super.doEndTag();
}
catch (Exception ex)
{
throw new JspException(ex);
}
}
/**
* @param value the value to be converted
*/
public void setValue(Object value)
{
this.value = value;
}
/**
* If json is false, the normal dwr javascript protocol is used.
* If json is true, output will be a json response
* @param json flag for proper json output
*/
public void setJson(boolean json)
{
this.json = json;
}
/**
* The value to convert
*/
private Object value;
/**
* Should the output be proper json?
*/
private boolean json;
}