1 /* 2 * Copyright (C) 2017 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 package android.view.textclassifier; 17 18 /** 19 * Java wrapper for LangId native library interface. 20 * This class is used to detect languages in text. 21 */ 22 final class LangId { 23 24 static { 25 System.loadLibrary("textclassifier"); 26 } 27 28 private final long mModelPtr; 29 30 /** 31 * Creates a new instance of LangId predictor, using the provided model image. 32 */ 33 LangId(int fd) { 34 mModelPtr = nativeNew(fd); 35 } 36 37 /** 38 * Detects the language for given text. 39 */ 40 public ClassificationResult[] findLanguages(String text) { 41 return nativeFindLanguages(mModelPtr, text); 42 } 43 44 /** 45 * Frees up the allocated memory. 46 */ 47 public void close() { 48 nativeClose(mModelPtr); 49 } 50 51 private static native long nativeNew(int fd); 52 53 private static native ClassificationResult[] nativeFindLanguages( 54 long context, String text); 55 56 private static native void nativeClose(long context); 57 58 /** Classification result for findLanguage method. */ 59 static final class ClassificationResult { 60 final String mLanguage; 61 /** float range: 0 - 1 */ 62 final float mScore; 63 64 ClassificationResult(String language, float score) { 65 mLanguage = language; 66 mScore = score; 67 } 68 } 69 } 70
