1 /*
2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23  * questions.
24  */
25 
26 package com.sun.tools.internal.xjc.util;
27 
28 import org.xml.sax.Locator;
29 
30 
31 /**
32  * Other miscellaneous utility methods.
33  *
34  * @author
35  *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
36  */
37 public final class Util {
Util()38     private Util() {}   // no instanciation please
39 
40     /**
41      * An easier-to-use version of the System.getProperty method
42      * that doesn't throw an exception even if a property cannot be
43      * read.
44      */
getSystemProperty( String name )45     public static String getSystemProperty( String name ) {
46         try {
47             return System.getProperty(name);
48         } catch( SecurityException e ) {
49             return null;
50         }
51     }
52 
53     /**
54      * Compares if two {@link Locator}s point to the exact same position.
55      */
equals(Locator lhs, Locator rhs)56     public static boolean equals(Locator lhs, Locator rhs) {
57         return lhs.getLineNumber()==rhs.getLineNumber()
58         && lhs.getColumnNumber()==rhs.getColumnNumber()
59         && equals(lhs.getSystemId(),rhs.getSystemId())
60         && equals(lhs.getPublicId(),rhs.getPublicId());
61     }
62 
equals(String lhs, String rhs)63     private static boolean equals(String lhs, String rhs) {
64         if(lhs==null && rhs==null)  return true;
65         if(lhs==null || rhs==null)  return false;
66         return lhs.equals(rhs);
67     }
68 
69     /**
70      * Calls the other getSystemProperty method with
71      * "[clazz].[name].
72      */
getSystemProperty( Class clazz, String name )73     public static String getSystemProperty( Class clazz, String name ) {
74         return getSystemProperty( clazz.getName()+'.'+name );
75     }
76 }
77