/*
* $Id: ELMessagesNotPresentTag.java 471754 2006-11-06 14:55:09Z husted $
*
* 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.logic;
import org.apache.struts.taglib.logic.MessagesNotPresentTag;
import org.apache.strutsel.taglib.utils.EvalHelper;
import javax.servlet.jsp.JspException;
/**
* Evalute to <code>false</code> if an <code>ActionMessages</code> class or a
* class that can be converted to an <code>ActionMessages</code> class is in
* request scope under the specified key and there is at least one message in
* the class or for the property specified. <p> This class is a subclass of
* the class <code>org.apache.struts.taglib.logic.MessagesNotPresentTag</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: 471754 $
*/
public class ELMessagesNotPresentTag extends MessagesNotPresentTag {
/**
* Instance variable mapped to "name" tag attribute. (Mapping set in
* associated BeanInfo class.)
*/
private String nameExpr;
/**
* Instance variable mapped to "property" tag attribute. (Mapping set in
* associated BeanInfo class.)
*/
private String propertyExpr;
/**
* Instance variable mapped to "message" tag attribute. (Mapping set in
* associated BeanInfo class.)
*/
private String messageExpr;
/**
* Getter method for "name" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public String getNameExpr() {
return (nameExpr);
}
/**
* Getter method for "property" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public String getPropertyExpr() {
return (propertyExpr);
}
/**
* Getter method for "message" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public String getMessageExpr() {
return (messageExpr);
}
/**
* Setter method for "name" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public void setNameExpr(String nameExpr) {
this.nameExpr = nameExpr;
}
/**
* Setter method for "property" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public void setPropertyExpr(String propertyExpr) {
this.propertyExpr = propertyExpr;
}
/**
* Setter method for "message" tag attribute. (Mapping set in associated
* BeanInfo class.)
*/
public void setMessageExpr(String messageExpr) {
this.messageExpr = messageExpr;
}
/**
* Releases state of custom tag so this instance can be reused.
*/
public void release() {
super.release();
setNameExpr(null);
setPropertyExpr(null);
setMessageExpr(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("property", getPropertyExpr(), this,
pageContext)) != null) {
setProperty(string);
}
if ((string =
EvalHelper.evalString("message", getMessageExpr(), this,
pageContext)) != null) {
setMessage(string);
}
}
}