001/* 002 * flattr4j - A Java library for Flattr 003 * 004 * Copyright (C) 2011 Richard "Shred" Körber 005 * http://flattr4j.shredzone.org 006 * 007 * This program is free software: you can redistribute it and/or modify 008 * it under the terms of the GNU General Public License / GNU Lesser 009 * General Public License as published by the Free Software Foundation, 010 * either version 3 of the License, or (at your option) any later version. 011 * 012 * Licensed under the Apache License, Version 2.0 (the "License"); 013 * you may not use this file except in compliance with the License. 014 * 015 * This program is distributed in the hope that it will be useful, 016 * but WITHOUT ANY WARRANTY; without even the implied warranty of 017 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 018 */ 019package org.shredzone.flattr4j.web.tag; 020 021import javax.servlet.jsp.JspException; 022import javax.servlet.jsp.tagext.BodyTagSupport; 023 024/** 025 * An optional HTML attribute for the parent tag. 026 * 027 * @author Richard "Shred" Körber 028 */ 029public class AttributeTag extends BodyTagSupport { 030 private static final long serialVersionUID = -3139247850992098426L; 031 032 private String name; 033 private String value; 034 035 public void setName(String name) { 036 this.name = name; 037 } 038 039 public void setValue(String value) { 040 this.value = value; 041 } 042 043 @Override 044 public int doStartTag() throws JspException { 045 if (value != null) { 046 return SKIP_BODY; 047 } else { 048 return EVAL_BODY_BUFFERED; 049 } 050 } 051 052 @Override 053 public int doEndTag() throws JspException { 054 Attributed parent = TagUtils.findAncestorWithType(this, Attributed.class); 055 if (parent != null) { 056 if (value != null) { 057 parent.setAttribute(name, value); 058 } else { 059 parent.setAttribute(name, getBodyContent().getString()); 060 } 061 } 062 return EVAL_PAGE; 063 } 064 065}