1 /* 2 * Copyright (c) 2009, 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 26 package sun.nio.fs; 27 28 import java.util.*; 29 import java.nio.file.*; 30 import java.nio.charset.Charset; 31 import java.security.*; 32 import sun.security.action.*; 33 34 /** 35 * Utility methods 36 */ 37 38 class Util { Util()39 private Util() { } 40 41 // private static final Charset jnuEncoding = Charset.forName( 42 // AccessController.doPrivileged(new GetPropertyAction("sun.jnu.encoding"))); 43 private static final Charset jnuEncoding = Charset.forName("UTF-8"); 44 45 /** 46 * Returns {@code Charset} corresponding to the sun.jnu.encoding property 47 */ jnuEncoding()48 static Charset jnuEncoding() { 49 return jnuEncoding; 50 } 51 52 /** 53 * Encodes the given String into a sequence of bytes using the {@code Charset} 54 * specified by the sun.jnu.encoding property. 55 */ toBytes(String s)56 static byte[] toBytes(String s) { 57 return s.getBytes(jnuEncoding); 58 } 59 60 /** 61 * Constructs a new String by decoding the specified array of bytes using the 62 * {@code Charset} specified by the sun.jnu.encoding property. 63 */ toString(byte[] bytes)64 static String toString(byte[] bytes) { 65 return new String(bytes, jnuEncoding); 66 } 67 68 69 /** 70 * Splits a string around the given character. The array returned by this 71 * method contains each substring that is terminated by the character. Use 72 * for simple string spilting cases when needing to avoid loading regex. 73 */ split(String s, char c)74 static String[] split(String s, char c) { 75 int count = 0; 76 for (int i=0; i<s.length(); i++) { 77 if (s.charAt(i) == c) 78 count++; 79 } 80 String[] result = new String[count+1]; 81 int n = 0; 82 int last = 0; 83 for (int i=0; i<s.length(); i++) { 84 if (s.charAt(i) == c) { 85 result[n++] = s.substring(last, i); 86 last = i + 1; 87 } 88 } 89 result[n] = s.substring(last, s.length()); 90 return result; 91 } 92 93 /** 94 * Returns a Set containing the given elements. 95 */ 96 @SafeVarargs newSet(E... elements)97 static <E> Set<E> newSet(E... elements) { 98 HashSet<E> set = new HashSet<>(); 99 for (E e: elements) { 100 set.add(e); 101 } 102 return set; 103 } 104 105 /** 106 * Returns a Set containing all the elements of the given Set plus 107 * the given elements. 108 */ 109 @SafeVarargs newSet(Set<E> other, E... elements)110 static <E> Set<E> newSet(Set<E> other, E... elements) { 111 HashSet<E> set = new HashSet<>(other); 112 for (E e: elements) { 113 set.add(e); 114 } 115 return set; 116 } 117 118 /** 119 * Returns {@code true} if symbolic links should be followed 120 */ followLinks(LinkOption... options)121 static boolean followLinks(LinkOption... options) { 122 boolean followLinks = true; 123 for (LinkOption option: options) { 124 if (option == LinkOption.NOFOLLOW_LINKS) { 125 followLinks = false; 126 } else if (option == null) { 127 throw new NullPointerException(); 128 } else { 129 throw new AssertionError("Should not get here"); 130 } 131 } 132 return followLinks; 133 } 134 } 135