137 lines
4.3 KiB
Java
137 lines
4.3 KiB
Java
/*
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* Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.nio.fs;
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import java.util.*;
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import java.nio.file.*;
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import java.nio.charset.Charset;
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import java.security.*;
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import sun.security.action.*;
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/**
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* Utility methods
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*/
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class Util {
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private Util() { }
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// Android-changed: Hard-code UTF-8 for jnuEncoding rather than requiring a system property.
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// The system property sun.jnu.encoding is not set on Android; we just hard-code "UTF-8" here.
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// private static final Charset jnuEncoding = Charset.forName(
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// AccessController.doPrivileged(new GetPropertyAction("sun.jnu.encoding")));
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private static final Charset jnuEncoding = Charset.forName("UTF-8");
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/**
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* Returns {@code Charset} corresponding to the sun.jnu.encoding property
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*/
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static Charset jnuEncoding() {
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return jnuEncoding;
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}
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/**
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* Encodes the given String into a sequence of bytes using the {@code Charset}
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* specified by the sun.jnu.encoding property.
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*/
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static byte[] toBytes(String s) {
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return s.getBytes(jnuEncoding);
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}
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/**
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* Constructs a new String by decoding the specified array of bytes using the
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* {@code Charset} specified by the sun.jnu.encoding property.
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*/
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static String toString(byte[] bytes) {
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return new String(bytes, jnuEncoding);
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}
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/**
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* Splits a string around the given character. The array returned by this
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* method contains each substring that is terminated by the character. Use
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* for simple string spilting cases when needing to avoid loading regex.
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*/
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static String[] split(String s, char c) {
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int count = 0;
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for (int i=0; i<s.length(); i++) {
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if (s.charAt(i) == c)
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count++;
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}
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String[] result = new String[count+1];
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int n = 0;
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int last = 0;
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for (int i=0; i<s.length(); i++) {
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if (s.charAt(i) == c) {
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result[n++] = s.substring(last, i);
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last = i + 1;
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}
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}
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result[n] = s.substring(last, s.length());
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return result;
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}
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/**
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* Returns a Set containing the given elements.
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*/
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@SafeVarargs
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static <E> Set<E> newSet(E... elements) {
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HashSet<E> set = new HashSet<>();
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for (E e: elements) {
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set.add(e);
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}
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return set;
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}
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/**
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* Returns a Set containing all the elements of the given Set plus
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* the given elements.
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*/
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@SafeVarargs
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static <E> Set<E> newSet(Set<E> other, E... elements) {
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HashSet<E> set = new HashSet<>(other);
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for (E e: elements) {
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set.add(e);
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}
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return set;
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}
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/**
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* Returns {@code true} if symbolic links should be followed
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*/
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static boolean followLinks(LinkOption... options) {
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boolean followLinks = true;
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for (LinkOption option: options) {
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if (option == LinkOption.NOFOLLOW_LINKS) {
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followLinks = false;
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} else if (option == null) {
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throw new NullPointerException();
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} else {
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throw new AssertionError("Should not get here");
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}
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}
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return followLinks;
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}
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}
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