| package org.apache.turbine.services.jsp.tags; |
| |
| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" and |
| * "Apache Turbine" must not be used to endorse or promote products |
| * derived from this software without prior written permission. For |
| * written permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * "Apache Turbine", nor may "Apache" appear in their name, without |
| * prior written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| import javax.servlet.jsp.JspException; |
| import javax.servlet.jsp.PageContext; |
| import javax.servlet.jsp.tagext.TagSupport; |
| |
| /** |
| * Supporting class for the head tag. |
| * Tags that surround the screen content that will replace the |
| * <x:screen section="head" /> tag in a layout template. |
| * Example usage: |
| * <x:head><title>Login</title></x:head> |
| * |
| * @author <a href="mailto:john.mcnally@clearink.com">John D. McNally</a> |
| */ |
| public class HeadTag extends TagSupport |
| { |
| /** |
| * Method called when the start tag is encountered. If the layout is |
| * in the head section, the contents between the head tags are executed. |
| * Otherwise they are skipped. |
| * |
| * @return EVAL_BODY_INCLUDE, if the section has been set to body |
| * or SKIP_BODY, if this section is not active. |
| */ |
| public int doStartTag() throws JspException |
| { |
| boolean isActive = ScreenTag.HEAD.equals( |
| pageContext.getAttribute(ScreenTag.SECTION_KEY, |
| PageContext.REQUEST_SCOPE) ); |
| if (isActive) |
| { |
| return EVAL_BODY_INCLUDE; |
| } |
| return SKIP_BODY; |
| } |
| |
| /** |
| * Method called when the end tag is encountered; it does nothing. |
| * |
| * @return EVAL_PAGE |
| */ |
| public int doEndTag() throws JspException |
| { |
| return EVAL_PAGE; |
| } |
| } |