org.glassfish.pfl.dynamic.codegen.impl.Identifier Maven / Gradle / Ivy

Go to download
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. 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_1_1.html
 * or packager/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.
 * 
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 * 
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [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 org.glassfish.pfl.dynamic.codegen.impl ;

import org.glassfish.pfl.basic.contain.Pair;

/** Some utilities for dealing with Java identifiers.
 *
 * @Author Ken Cavanaugh
 */
public abstract class Identifier {
    private Identifier() {}

    /** Check that name is a valid Java identifier.  No packages
     * are permitted here.
     */
    public static boolean isValidIdentifier( String name ) {
	if ((name == null) || (name.length() == 0))
	    return false ;

	if (!Character.isJavaIdentifierStart( name.charAt(0) ))
	    return false ;

	for (int ctr=1; ctr splitFQN( String fqn ) {
	int count = fqn.lastIndexOf( '.' ) ;
	String pkg = (count<0) ? "" : fqn.substring( 0, count ) ;
	String cls = fqn.substring( count+1 ) ;
	return new Pair( pkg, cls ) ;
    }
}