1/*
2 * Copyright (c) 1997, 2013, 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
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.tools.internal.xjc.util;
27
28import org.xml.sax.Locator;
29
30
31/**
32 * Other miscellaneous utility methods.
33 *
34 * @author
35 *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
36 */
37public final class 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     */
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     */
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
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     */
73    public static String getSystemProperty( Class clazz, String name ) {
74        return getSystemProperty( clazz.getName()+'.'+name );
75    }
76}
77