1 /* 2 * Copyright (C) 2014 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.compat; 18 19 import android.view.textservice.TextInfo; 20 21 import com.android.inputmethod.annotations.UsedForTesting; 22 23 import java.lang.reflect.Constructor; 24 import java.lang.reflect.Method; 25 26 @UsedForTesting 27 public final class TextInfoCompatUtils { 28 // Note that TextInfo.getCharSequence() is supposed to be available in API level 21 and later. 29 private static final Method TEXT_INFO_GET_CHAR_SEQUENCE = 30 CompatUtils.getMethod(TextInfo.class, "getCharSequence"); 31 private static final Constructor<?> TEXT_INFO_CONSTRUCTOR_FOR_CHAR_SEQUENCE = 32 CompatUtils.getConstructor(TextInfo.class, CharSequence.class, int.class, int.class, 33 int.class, int.class); 34 35 @UsedForTesting 36 public static boolean isCharSequenceSupported() { 37 return TEXT_INFO_GET_CHAR_SEQUENCE != null && 38 TEXT_INFO_CONSTRUCTOR_FOR_CHAR_SEQUENCE != null; 39 } 40 41 @UsedForTesting 42 public static TextInfo newInstance(CharSequence charSequence, int start, int end, int cookie, 43 int sequenceNumber) { 44 if (TEXT_INFO_CONSTRUCTOR_FOR_CHAR_SEQUENCE != null) { 45 return (TextInfo) CompatUtils.newInstance(TEXT_INFO_CONSTRUCTOR_FOR_CHAR_SEQUENCE, 46 charSequence, start, end, cookie, sequenceNumber); 47 } 48 return new TextInfo(charSequence.subSequence(start, end).toString(), cookie, 49 sequenceNumber); 50 } 51 52 /** 53 * Returns the result of {@link TextInfo#getCharSequence()} when available. Otherwise returns 54 * the result of {@link TextInfo#getText()} as fall back. 55 * @param textInfo the instance for which {@link TextInfo#getCharSequence()} or 56 * {@link TextInfo#getText()} is called. 57 * @return the result of {@link TextInfo#getCharSequence()} when available. Otherwise returns 58 * the result of {@link TextInfo#getText()} as fall back. If {@code textInfo} is {@code null}, 59 * returns {@code null}. 60 */ 61 @UsedForTesting 62 public static CharSequence getCharSequenceOrString(final TextInfo textInfo) { 63 final CharSequence defaultValue = (textInfo == null ? null : textInfo.getText()); 64 return (CharSequence) CompatUtils.invoke(textInfo, defaultValue, 65 TEXT_INFO_GET_CHAR_SEQUENCE); 66 } 67 } 68
