com.sun.tools.xjc.util.Util Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jaxb-xjc Show documentation
The newest version!
/*
 * 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.tools.xjc.util;

import org.xml.sax.Locator;


/**
 * Other miscellaneous utility methods. 
 * 
 * @author
 *     Kohsuke Kawaguchi ([email protected])
 */
public final class Util {
    private Util() {}   // no instanciation please

    /**
     * An easier-to-use version of the System.getProperty method
     * that doesn't throw an exception even if a property cannot be
     * read.
     */
    public static String getSystemProperty( String name ) {
        try {
            return System.getProperty(name);
        } catch( SecurityException e ) {
            return null;
        }
    }

    /**
     * Compares if two {@link Locator}s point to the exact same position.
     */
    public static boolean equals(Locator lhs, Locator rhs) {
        return lhs.getLineNumber()==rhs.getLineNumber()
        && lhs.getColumnNumber()==rhs.getColumnNumber()
        && equals(lhs.getSystemId(),rhs.getSystemId())
        && equals(lhs.getPublicId(),rhs.getPublicId());
    }

    private static boolean equals(String lhs, String rhs) {
        if(lhs==null && rhs==null)  return true;
        if(lhs==null || rhs==null)  return false;
        return lhs.equals(rhs);
    }

    /**
     * Calls the other getSystemProperty method with
     * "[clazz].[name].
     */
    public static String getSystemProperty( Class clazz, String name ) {
        return getSystemProperty( clazz.getName()+'.'+name );
    }
}