package cvexample.view;

import javax.servlet.jsp.tagext.*;
import javax.servlet.jsp.*;
import javax.servlet.*;
import java.io.*;

import cvexample.controller.*;

/**
 * A custom tag that is nested within a Container tag to include an 
 * element of a composite.
 */
public class ContainerIncludeTag extends TagSupport {
    /** the name of the element to include */
    private String name;
      
    /**
     * Get the view from the current container, and map the name of this
     * include to a page to include in that view
     */
    public int doEndTag() throws JspException {
        // find the Container tag and get the view from it
        ContainerTag ct =
            (ContainerTag) findAncestorWithClass(this, ContainerTag.class);     
        View v = ct.getView();
        
        // get the url for this view
        String viewURL = v.getUrl(ct.getName(), name);
        if (viewURL != null) {
            try {    
                // include it
                pageContext.include(viewURL);
            } catch( Exception ex ) {
                throw new JspException("Unable to include " + viewURL, ex);
            }
        }
        return EVAL_PAGE;
    }
     
    /**
     * Used by the container to set the name of this composite element
     */
    public void setName(String value) {
        name = value;
    }
}