?? elbasetag.java
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/*
* $Id: ELBaseTag.java 54933 2004-10-16 17:04:52Z germuska $
*
* Copyright 1999-2004 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.strutsel.taglib.html;
import org.apache.struts.taglib.html.BaseTag;
import javax.servlet.jsp.JspException;
import org.apache.strutsel.taglib.utils.EvalHelper;
/**
* Renders an HTML <base> element with an href
* attribute pointing to the absolute location of the enclosing JSP page. This
* tag is only valid when nested inside a head tag body. The presence
* of this tag allows the browser to resolve relative URL's to images,
* CSS stylesheets and other resources in a manner independent of the URL
* used to call the ActionServlet.
*<p>
* This class is a subclass of the class
* <code>org.apache.struts.taglib.html.BaseTag</code> which provides most of
* the described functionality. This subclass allows all attribute values to
* be specified as expressions utilizing the JavaServer Pages Standard Library
* expression language.
*
* @version $Rev: 54933 $
*/
public class ELBaseTag extends BaseTag {
/**
* Instance variable mapped to "target" tag attribute.
* (Mapping set in associated BeanInfo class.)
*/
private String targetExpr;
/**
* Instance variable mapped to "server" tag attribute.
* (Mapping set in associated BeanInfo class.)
*/
private String serverExpr;
/**
* Getter method for "target" tag attribute.
* (Mapping set in associated BeanInfo class.)
*/
public String getTargetExpr() { return (targetExpr); }
/**
* Getter method for "server" tag attribute.
* (Mapping set in associated BeanInfo class.)
*/
public String getServerExpr() { return (serverExpr); }
/**
* Setter method for "target" tag attribute.
* (Mapping set in associated BeanInfo class.)
*/
public void setTargetExpr(String targetExpr) { this.targetExpr = targetExpr; }
/**
* Setter method for "server" tag attribute.
* (Mapping set in associated BeanInfo class.)
*/
public void setServerExpr(String serverExpr) { this.serverExpr = serverExpr; }
/**
* Resets attribute values for tag reuse.
*/
public void release()
{
super.release();
setTargetExpr(null);
setServerExpr(null);
}
/**
* Process the start tag.
*
* @exception JspException if a JSP exception has occurred
*/
public int doStartTag() throws JspException {
evaluateExpressions();
return (super.doStartTag());
}
/**
* Processes all attribute values which use the JSTL expression evaluation
* engine to determine their values.
*
* @exception JspException if a JSP exception has occurred
*/
private void evaluateExpressions() throws JspException {
String string = null;
if ((string = EvalHelper.evalString("target", getTargetExpr(),
this, pageContext)) != null)
setTarget(string);
if ((string = EvalHelper.evalString("server", getServerExpr(),
this, pageContext)) != null)
setServer(string);
}
}
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