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 22 * or visit www.oracle.com if you need additional information or have any 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