DO NOT REPLY [Bug 31774] - [TILES] PresentTag

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http://issues.apache.org/bugzilla/show_bug.cgi?id=31774

[TILES] PresentTag





------- Additional Comments From JordiMcLeod@gmail.com  2004-10-19 13:08 -------
package org.apache.struts.taglib.tiles;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;

import org.apache.struts.taglib.tiles.ComponentConstants;
import org.apache.struts.tiles.ComponentContext;

/**
 * Render the body only if the specified component/template attribute property
 * id present.
 */
public class PresentTag extends TagSupport implements ComponentConstants
{

    private String attribute = null;
    /** Role attribute */
    private String role = null;

    /**
     * Default constructor.
     */
    public PresentTag()
    {
        super();
    }

    /**
     * Release all allocated resources.
     */
    public void release()
    {

        super.release();
        attribute = null;
        role = null;
    }

    /**
     * Set attribute.
     * 
     * @param attribute
     *            Attribute.
     */
    public void setAttribute(String attribute)
    {
        this.attribute = attribute;
    }

    /**
     * Get attribute.
     * 
     * @return Attribute.
     */
    public String getAttribute()
    {
        return attribute;
    }

    /**
     * Set Name. Same as setAttribute().
     * 
     * @param value
     *            Attribute.
     */
    public void setName(String value)
    {
        this.attribute = value;
    }

    /**
     * Get Name. Set as getAttribute().
     * 
     * @return Attribute.
     */
    public String getName()
    {
        return attribute;
    }

    /**
     * Set role.
     * 
     * @param role
     *            The role the user must be in to store content.
     */
    public void setRole(String role)
    {
        this.role = role;
    }

    /**
     * Get role.
     * 
     * @return Role.
     */
    public String getRole()
    {
        return role;
    }

    /**
     * Perform the test required for this particular tag, and either evaluate or
     * skip the body of this tag.
     * 
     * @exception JspException
     *                if a JSP exception occurs
     */
    public int doStartTag() throws JspException
    {
        // Check role
        if (role != null
                && !((HttpServletRequest) pageContext.getRequest())
                        .isUserInRole(role))
        {
            return SKIP_BODY;
        } // end if

        // Get context
        ComponentContext compContext = (ComponentContext) pageContext
                .getAttribute(ComponentConstants.COMPONENT_CONTEXT,
                        PageContext.REQUEST_SCOPE);

        if (compContext == null)
                throw new JspException(
                        "Error - tag.present : component context is not defined.
Check tag syntax");

        Object value = compContext.getAttribute(attribute);
        // The value is not null so present
        if (value != null) return (EVAL_BODY_INCLUDE);

        return (SKIP_BODY);
    }

    /**
     * Evaluate the remainder of the current page normally.
     * 
     * @exception JspException
     *                if a JSP exception occurs
     */
    public int doEndTag() throws JspException
    {
        return (EVAL_PAGE);
    }
}

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