/*
 * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
 * 
 * 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 freemarker.ext.jsp;

import javax.servlet.ServletContext;
import javax.servlet.jsp.JspApplicationContext;

/**
 */
class FreeMarkerJspFactory21 extends FreeMarkerJspFactory {
    private static final String JSPCTX_KEY =  
        FreeMarkerJspFactory21.class.getName() + "#jspAppContext";

    @Override
    protected String getSpecificationVersion() {
        return "2.1";
    }
    
    @Override
    public JspApplicationContext getJspApplicationContext(ServletContext ctx) {
        JspApplicationContext jspctx = (JspApplicationContext) ctx.getAttribute(
                JSPCTX_KEY);
        if (jspctx == null) {
            synchronized (ctx) {
                jspctx = (JspApplicationContext) ctx.getAttribute(JSPCTX_KEY);
                if (jspctx == null) {
                    jspctx = new FreeMarkerJspApplicationContext();
                    ctx.setAttribute(JSPCTX_KEY, jspctx);
                }
            }
        }
        return jspctx;
    }
}