/*
* #!
* Ontopia Navigator
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* 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 net.ontopia.topicmaps.nav2.taglibs.logic;
import java.io.IOException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.BodyTagSupport;
import javax.servlet.jsp.tagext.BodyContent;
/**
* INTERNAL: Logic Tag: The else part of the if tag.
*/
public class IfElseTag extends BodyTagSupport {
// member
private IfTag ifTagParent;
/**
* Process the start tag for this instance.
*/
public int doStartTag() throws JspTagException {
this.ifTagParent = (IfTag) findAncestorWithClass(this, IfTag.class);
if (ifTagParent == null) {
throw new JspTagException("logic:else is not inside logic:if.");
}
if (ifTagParent.matchCondition())
return SKIP_BODY;
else
return EVAL_BODY_BUFFERED;
}
/**
* Actions after some body has been evaluated.
*/
public int doAfterBody() throws JspTagException {
// we have already checked the condition in doStartTag
try {
BodyContent body = getBodyContent();
JspWriter out = body.getEnclosingWriter();
out.print( body.getString() );
body.clearBody();
} catch(IOException ioe) {
throw new JspTagException("Problem occurred when writing to JspWriter in logic:else: " + ioe);
}
return SKIP_BODY;
}
public int doEndTag() {
// reset members
ifTagParent = null;
return EVAL_PAGE;
}
/**
* Resets the state of the Tag.
*/
public void release() {
// overwrite default behaviour
// do not set parent to null!!!
}
}