/*
* JBoss, Home of Professional Open Source
* Copyright 2014, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.richfaces;
/**
* This enumeration encapsulates a JSF version used in current context (VM/classloader)
*/
public enum JsfVersion {
JSF_2_0,
JSF_2_1,
JSF_2_2;
private static final JsfVersion CURRENT_VERSION = detectVersion();
/**
* Detects a version by checking whether JSF API classes specific for a specific JSF specification version are on classpath.
*/
private static JsfVersion detectVersion() {
try {
Class.forName("javax.faces.lifecycle.ClientWindow");
return JSF_2_2;
} catch (ClassNotFoundException e1) {
try {
Class.forName("javax.faces.view.facelets.FaceletCacheFactory");
return JSF_2_1;
} catch (ClassNotFoundException e2) {
return JSF_2_0;
}
}
}
/**
* Detects current JSF API version in use in a context of current VM/classloader.
*
* @see #detectVersion() for more details how it is detected.
*/
public static JsfVersion getCurrent() {
return CURRENT_VERSION;
}
/**
* Checks whether this version of JSF is compliant with the provided version.
*
* @param version a version to check compatibility of this version with
* @return true when this version of JSF is compliant with the provided version; false otherwise.
*/
public boolean isCompliantWith(JsfVersion version) {
if (version == null) {
throw new IllegalArgumentException("version must be provided");
}
return this.ordinal() >= version.ordinal();
}
}