1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.inputmethod.latin.common; 18 19 /** 20 * Emojis are supplementary characters expressed as a low+high pair. For instance, 21 * the emoji U+1F625 is encoded as "\uD83D\uDE25" in UTF-16, where '\uD83D' is in 22 * the range of [0xd800, 0xdbff] and '\uDE25' is in the range of [0xdc00, 0xdfff]. 23 * {@see http://docs.oracle.com/javase/6/docs/api/java/lang/Character.html#unicode} 24 */ 25 public final class UnicodeSurrogate { 26 private static final char LOW_SURROGATE_MIN = '\uD800'; 27 private static final char LOW_SURROGATE_MAX = '\uDBFF'; 28 private static final char HIGH_SURROGATE_MIN = '\uDC00'; 29 private static final char HIGH_SURROGATE_MAX = '\uDFFF'; 30 31 public static boolean isLowSurrogate(final char c) { 32 return c >= LOW_SURROGATE_MIN && c <= LOW_SURROGATE_MAX; 33 } 34 35 public static boolean isHighSurrogate(final char c) { 36 return c >= HIGH_SURROGATE_MIN && c <= HIGH_SURROGATE_MAX; 37 } 38 } 39
