com.liferay.taglib.TagSupport Maven / Gradle / Ivy
/**
* Copyright (c) 2000-present Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
package com.liferay.taglib;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;
/**
*
* See https://issues.liferay.com/browse/LPS-13878.
*
*
* @author Shuyang Zhou
*/
public class TagSupport implements DirectTag, Tag {
public static Tag findAncestorWithClass(Tag fromTag, Class clazz) {
if ((fromTag == null) || (clazz == null) ||
(!Tag.class.isAssignableFrom(clazz) && !clazz.isInterface())) {
return null;
}
while (true) {
Tag parentTag = fromTag.getParent();
if (parentTag == null) {
return null;
}
if (clazz.isInstance(parentTag)) {
return parentTag;
}
fromTag = parentTag;
}
}
@Override
public int doEndTag() throws JspException {
return EVAL_PAGE;
}
@Override
public int doStartTag() throws JspException {
return SKIP_BODY;
}
@Override
public Tag getParent() {
return _parent;
}
@Override
public void release() {
_parent = null;
}
@Override
public void setPageContext(PageContext pageContext) {
this.pageContext = pageContext;
}
@Override
public void setParent(Tag tag) {
_parent = tag;
}
protected PageContext pageContext;
private Tag _parent;
}