01: /*
02: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
03: *
04: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
05: *
06: * The contents of this file are subject to the terms of either the GNU
07: * General Public License Version 2 only ("GPL") or the Common Development
08: * and Distribution License("CDDL") (collectively, the "License"). You
09: * may not use this file except in compliance with the License. You can obtain
10: * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
11: * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
12: * language governing permissions and limitations under the License.
13: *
14: * When distributing the software, include this License Header Notice in each
15: * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
16: * Sun designates this particular file as subject to the "Classpath" exception
17: * as provided by Sun in the GPL Version 2 section of the License file that
18: * accompanied this code. If applicable, add the following below the License
19: * Header, with the fields enclosed by brackets [] replaced by your own
20: * identifying information: "Portions Copyrighted [year]
21: * [name of copyright owner]"
22: *
23: * Contributor(s):
24: *
25: * If you wish your version of this file to be governed by only the CDDL or
26: * only the GPL Version 2, indicate your decision by adding "[Contributor]
27: * elects to include this software in this distribution under the [CDDL or GPL
28: * Version 2] license." If you don't indicate a single choice of license, a
29: * recipient has the option to distribute your version of this file under
30: * either the CDDL, the GPL Version 2 or to extend the choice of license to
31: * its licensees as provided above. However, if you add GPL Version 2 code
32: * and therefore, elected the GPL Version 2 license, then the option applies
33: * only if the new code is made subject to such option by the copyright
34: * holder.
35: */
36: package com.sun.tools.xjc.util;
37:
38: import org.xml.sax.Locator;
39:
40: /**
41: * Other miscellaneous utility methods.
42: *
43: * @author
44: * Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
45: */
46: public final class Util {
47: private Util() {
48: } // no instanciation please
49:
50: /**
51: * An easier-to-use version of the System.getProperty method
52: * that doesn't throw an exception even if a property cannot be
53: * read.
54: */
55: public static String getSystemProperty(String name) {
56: try {
57: return System.getProperty(name);
58: } catch (SecurityException e) {
59: return null;
60: }
61: }
62:
63: /**
64: * Compares if two {@link Locator}s point to the exact same position.
65: */
66: public static boolean equals(Locator lhs, Locator rhs) {
67: return lhs.getLineNumber() == rhs.getLineNumber()
68: && lhs.getColumnNumber() == rhs.getColumnNumber()
69: && equals(lhs.getSystemId(), rhs.getSystemId())
70: && equals(lhs.getPublicId(), rhs.getPublicId());
71: }
72:
73: private static boolean equals(String lhs, String rhs) {
74: if (lhs == null && rhs == null)
75: return true;
76: if (lhs == null || rhs == null)
77: return false;
78: return lhs.equals(rhs);
79: }
80:
81: /**
82: * Calls the other getSystemProperty method with
83: * "[clazz].[name].
84: */
85: public static String getSystemProperty(Class clazz, String name) {
86: return getSystemProperty(clazz.getName() + '.' + name);
87: }
88: }
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