| /* |
| * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| public class Surrogate { |
| |
| public static final int UCS4_SURROGATE_MIN = 0x10000; |
| public static final int UCS4_MAX = (1 << 20) + UCS4_SURROGATE_MIN - 1; |
| |
| // UTF-16 surrogate-character ranges |
| // |
| public static final char MIN_HIGH = '\uD800'; |
| public static final char MAX_HIGH = '\uDBFF'; |
| public static final char MIN_LOW = '\uDC00'; |
| public static final char MAX_LOW = '\uDFFF'; |
| public static final char MIN = MIN_HIGH; |
| public static final char MAX = MAX_LOW; |
| |
| public static boolean neededFor(int uc) { |
| return (uc >= UCS4_SURROGATE_MIN) && (uc <= UCS4_MAX); |
| } |
| |
| public static boolean isHigh(int c) { |
| return (MIN_HIGH <= c) && (c <= MAX_HIGH); |
| } |
| |
| static char high(int uc) { |
| return (char)(0xd800 | (((uc - UCS4_SURROGATE_MIN) >> 10) & 0x3ff)); |
| } |
| |
| public static boolean isLow(int c) { |
| return (MIN_LOW <= c) && (c <= MAX_LOW); |
| } |
| |
| static char low(int uc) { |
| return (char)(0xdc00 | ((uc - UCS4_SURROGATE_MIN) & 0x3ff)); |
| } |
| |
| public static boolean is(int c) { |
| return (MIN <= c) && (c <= MAX); |
| } |
| |
| static int toUCS4(char c, char d) { |
| return (((c & 0x3ff) << 10) | (d & 0x3ff)) + 0x10000; |
| } |
| |
| } |