1 /* 2 * Copyright (c) 2009, 2018, 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 sun.nio.fs; 27 28 import java.util.*; 29 import java.nio.file.*; 30 import java.nio.charset.Charset; 31 import sun.security.action.GetPropertyAction; 32 33 /** 34 * Utility methods 35 */ 36 37 class Util { 38 private Util() { } 39 40 private static final Charset jnuEncoding = Charset.forName( 41 GetPropertyAction.privilegedGetProperty("sun.jnu.encoding")); 42 43 /** 44 * Returns {@code Charset} corresponding to the sun.jnu.encoding property 45 */ 46 static Charset jnuEncoding() { 47 return jnuEncoding; 48 } 49 50 /** 51 * Encodes the given String into a sequence of bytes using the {@code Charset} 52 * specified by the sun.jnu.encoding property. 53 */ 54 static byte[] toBytes(String s) { 55 return s.getBytes(jnuEncoding); 56 } 57 58 /** 59 * Constructs a new String by decoding the specified array of bytes using the 60 * {@code Charset} specified by the sun.jnu.encoding property. 61 */ 62 static String toString(byte[] bytes) { 63 return new String(bytes, jnuEncoding); 64 } 65 66 67 /** 68 * Splits a string around the given character. The array returned by this 69 * method contains each substring that is terminated by the character. Use 70 * for simple string splitting cases when needing to avoid loading regex. 71 */ 72 static String[] split(String s, char c) { 73 int count = 0; 74 for (int i=0; i<s.length(); i++) { 75 if (s.charAt(i) == c) 76 count++; 77 } 78 String[] result = new String[count+1]; 79 int n = 0; 80 int last = 0; 81 for (int i=0; i<s.length(); i++) { 82 if (s.charAt(i) == c) { 83 result[n++] = s.substring(last, i); 84 last = i + 1; 85 } 86 } 87 result[n] = s.substring(last, s.length()); 88 return result; 89 } 90 91 /** 92 * Returns a Set containing the given elements. 93 */ 94 @SafeVarargs 95 static <E> Set<E> newSet(E... elements) { 96 HashSet<E> set = new HashSet<>(); 97 for (E e: elements) { 98 set.add(e); 99 } 100 return set; 101 } 102 103 /** 104 * Returns a Set containing all the elements of the given Set plus 105 * the given elements. 106 */ 107 @SafeVarargs 108 static <E> Set<E> newSet(Set<E> other, E... elements) { 109 HashSet<E> set = new HashSet<>(other); 110 for (E e: elements) { 111 set.add(e); 112 } 113 return set; 114 } 115 116 /** 117 * Returns {@code true} if symbolic links should be followed 118 */ 119 static boolean followLinks(LinkOption... options) { 120 boolean followLinks = true; 121 for (LinkOption option: options) { 122 if (option == LinkOption.NOFOLLOW_LINKS) { 123 followLinks = false; 124 } else if (option == null) { 125 throw new NullPointerException(); 126 } else { 127 throw new AssertionError("Should not get here"); 128 } 129 } 130 return followLinks; 131 } 132 }