cmlenz 2002/08/04 10:58:36
Added: src/taglib/jstl/org/apache/slide/taglib/tag/jstl
ForEachAncestorTag.java
Log:
- Add a new tag for iterating through the list of ancestors of a node
Revision Changes Path
1.1
jakarta-slide/src/taglib/jstl/org/apache/slide/taglib/tag/jstl/ForEachAncestorTag.java
Index: ForEachAncestorTag.java
===================================================================
/*
* $Header: $
* $Revision: $
* $Date: $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 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 acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Slide", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* 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/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.slide.taglib.tag.jstl;
import java.util.Iterator;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.jstl.core.LoopTagSupport;
import org.apache.slide.taglib.bean.NodeBean;
import org.apache.slide.taglib.util.Iterators;
/**
* Tag class that extends the JSTL loop tag to provide iteration over the
* ancestors of a node.
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Christopher Lenz</a>
* @version $Revision: $
*/
public class ForEachAncestorTag
extends LoopTagSupport {
// ----------------------------------------------------- Instance Variables
/**
* Value of the 'node' attribute, which should be a JSP-EL expression
* referencing the NodeBean to use.
*/
protected String node;
/**
* Iterator over the ancestor nodes.
*/
protected Iterator iterator;
// ----------------------------------------------------------- Constructors
/**
* Default constructor.
*/
public ForEachAncestorTag() {
init();
}
// ------------------------------------------ LoopTagSupport Implementation
/**
*
*/
protected void prepare()
throws JspTagException {
NodeBean nodeBean = null;
try {
nodeBean = (NodeBean)
JstlTagUtils.evaluateOptionalAttribute("forEachAncestor",
"node", node,
NodeBean.class, this,
pageContext);
} catch (JspException e) {
// ignore
}
if (nodeBean == null) {
nodeBean = JstlTagUtils.findNode(this, pageContext);
if (nodeBean == null) {
throw new JspTagException("The 'forEachAncestors' tag must " +
"be nested inside a 'node' tag or an iteration over " +
"nodes, or the 'node' attribute must be set.");
}
}
iterator = Iterators.ancestorsIterator(nodeBean);
}
/**
*
*/
protected boolean hasNext()
throws JspTagException {
return iterator.hasNext();
}
/**
*
*/
protected Object next()
throws JspTagException {
return iterator.next();
}
/**
* Called by the JSP Engine when closing this tag.
*
* @throws JspException not thrown
*/
public int doEndTag()
throws JspException {
init();
return super.doEndTag();
}
/**
* Releases any resources we may have (or inherit).
*/
public void release() {
super.release();
init();
}
// --------------------------------------------------------- Public Methods
/**
* Sets the 'node' attribute.
*
* @param node the attribute value
*/
public void setNode(String node) {
this.node = node;
}
// -------------------------------------------------------- Private Methods
/**
* Initialize state for tag reuse.
*/
private void init() {
node = null;
iterator = null;
}
}
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