/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package com.sun.xml.ws.tx.common;

/**
 * This class contains various utility methods shared among
 * other modules.
 *
 * @author Ryan.Shoemaker@Sun.COM
 * @version $Revision: 1.6.2.2 $
 * @since 1.0
 */
public class Util {

    final static private TxLogger logger = TxLogger.getLogger(Util.class);
    
    static public boolean isClassAvailable(String classname) {
        Class tmClass = null;
        try {
            tmClass = Class.forName(classname);
        } catch (ClassNotFoundException ex) {
        }
        return tmClass != null;
    }
   
    private static Boolean hasJTA = null;
    
    /**
     * Identify if Java Transaction API available. 
     * If not available, container is not capable of creating a JTA transaction.
     */
    static public boolean isJTAAvailable() {
        if (hasJTA == null) {
            // Check for JTA 1.1 API availability.
            hasJTA = isClassAvailable("javax.transaction.TransactionManager") && 
                     isClassAvailable("javax.transaction.TransactionSynchronizationRegistry") ? Boolean.TRUE : Boolean.FALSE;
	    
            if (hasJTA && ! TransactionManagerImpl.getInstance().isTransactionManagerAvailable()) {
                hasJTA = Boolean.FALSE;
            }
        }
        return hasJTA.booleanValue();
    }
}