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Jakarta Standard Tag Library Implementation
/*
* Copyright (c) 1997-2020 Oracle and/or its affiliates. All rights reserved.
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.taglibs.standard.tag.common.xml;
import jakarta.servlet.jsp.JspException;
import jakarta.servlet.jsp.JspTagException;
import jakarta.servlet.jsp.tagext.BodyTagSupport;
import jakarta.servlet.jsp.tagext.Tag;
import org.apache.taglibs.standard.resources.Resources;
/**
* Support for tag handlers for <param>, the XML parameter
* subtag for <transformt<.
*
* @see TransformSupport
* @author Shawn Bayern
*/
public abstract class ParamSupport extends BodyTagSupport {
//*********************************************************************
// Protected state
protected String name; // 'name' attribute
protected Object value; // 'value' attribute
//*********************************************************************
// Constructor and initialization
public ParamSupport() {
super();
init();
}
private void init() {
name = null;
value = null;
}
//*********************************************************************
// Tag logic
// simply send our name and value to our parent tag
public int doEndTag() throws JspException {
Tag t = findAncestorWithClass(this, TransformSupport.class);
if (t == null)
throw new JspTagException(
Resources.getMessage("PARAM_OUTSIDE_TRANSFORM"));
TransformSupport parent = (TransformSupport) t;
Object value = this.value;
if (value == null) {
if (bodyContent == null || bodyContent.getString() == null)
value = "";
else
value = bodyContent.getString().trim();
}
parent.addParameter(name, value);
return EVAL_PAGE;
}
// Releases any resources we may have (or inherit)
public void release() {
init();
}
}