/*
* $Id: ELParamTag.java 482911 2006-12-06 05:44:33Z pbenedict $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.ParamTag;
import org.apache.strutsel.taglib.utils.EvalHelper;
import javax.servlet.jsp.JspException;
/**
* Adds a new request parameter to its parent {@link ELLinkTag}. This subclass
* allows all attribute values to be specified as expressions utilizing the
* JavaServer Pages Standard Library expression language.
*
* @version $Rev: 482911 $ $Date: 2006-12-06 06:44:33 +0100 (Mer, 06 déc 2006) $
* @since Struts 1.3.6
*/
public class ELParamTag extends ParamTag {
/**
* Instance variable mapped to "name" tag attribute. (Mapping set in
* associated BeanInfo class.)
*/
private String nameExpr;
/**
* Instance variable mapped to "value" tag attribute. (Mapping set in
* associated BeanInfo class.)
*/
private String valueExpr;
/**
* Getter method for "name" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public String getNameExpr() {
return (nameExpr);
}
/**
* Getter method for "value" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public String getValueExpr() {
return (valueExpr);
}
/**
* Setter method for "name" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public void setNameExpr(String nameExpr) {
this.nameExpr = nameExpr;
}
/**
* Setter method for "value" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public void setValueExpr(String valueExpr) {
this.valueExpr = valueExpr;
}
/**
* Resets attribute values for tag reuse.
*/
public void release() {
super.release();
setNameExpr(null);
setValueExpr(null);
}
/**
* Process the start tag.
*
* @throws 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.
*
* @throws JspException if a JSP exception has occurred
*/
private void evaluateExpressions() throws JspException {
String string = null;
if ((string = EvalHelper.evalString("name", getNameExpr(), this,
pageContext)) != null) {
setName(string);
}
if ((string = EvalHelper.evalString("value", getValueExpr(), this,
pageContext)) != null) {
setValue(string);
}
}
}