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package org.apache.taglibs.standard.examples.taglib;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.Writer;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletResponseWrapper;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.taglibs.standard.examples.util.IOBean;
import org.apache.taglibs.standard.examples.util.ServletResponseWrapperForWriter;
/**
* <p>Tag handler for <resource>
*
* @author Pierre Delisle
* @version $Revision: 1.3 $ $Date: 2007/05/06 02:17:12 $
*/
public class ResourceTag extends TagSupport {
//*********************************************************************
// Instance variables
private String id;
private String resource;
private Reader reader;
//*********************************************************************
// Constructors
public ResourceTag() {
super();
init();
}
private void init() {
id = null;
resource = null;
}
//*********************************************************************
// Tag's properties
/**
* Tag's 'id' attribute
*/
public void setId(String id) {
this.id = id;
}
/**
* Tag's 'resource' attribute
*/
public void setResource(String resource) {
this.resource = resource;
}
//*********************************************************************
// TagSupport methods
public int doStartTag() throws JspException {
reader = getReaderFromResource(resource);
exposeVariable(reader);
return EVAL_BODY_INCLUDE;
}
public int doEndTag() throws JspException {
try {
reader.close();
} catch (IOException ex) {}
reader = null;
return EVAL_PAGE;
}
/**
* Releases any resources we may have (or inherit)
*/
public void release() {
super.release();
init();
}
//*********************************************************************
// Tag's scific behavior methods
private Reader getReaderFromResource(String name) throws JspException {
HttpServletRequest request =
(HttpServletRequest)pageContext.getRequest();
HttpServletResponse response =
(HttpServletResponse)pageContext.getResponse();
RequestDispatcher rd = null;
// The response of the local URL becomes the reader that
// we export. Need temporary storage.
IOBean ioBean = new IOBean();
Writer writer = ioBean.getWriter();
ServletResponseWrapper responseWrapper =
new ServletResponseWrapperForWriter(
response, new PrintWriter(writer));
rd = pageContext.getServletContext().getRequestDispatcher(name);
try {
rd.include(request, responseWrapper);
return ioBean.getReader();
} catch (Exception ex) {
throw new JspException(ex);
}
}
//*********************************************************************
// Utility methods
private void exposeVariable(Reader reader) {
if (id != null) {
pageContext.setAttribute(id, reader);
}
}
}