1 /* GENERATED SOURCE. DO NOT MODIFY. */ 2 // 2016 and later: Unicode, Inc. and others. 3 // License & terms of use: http://www.unicode.org/copyright.html#License 4 /* 5 ******************************************************************************* 6 * Copyright (C) 2000-2009, International Business Machines Corporation and * 7 * others. All Rights Reserved. * 8 ******************************************************************************* 9 */ 10 /* Written by Simon Montagu, Matitiahu Allouche 11 * (ported from C code written by Markus W. Scherer) 12 */ 13 14 package android.icu.text; 15 16 /** 17 * Overrides default Bidi class values with custom ones. 18 * 19 * <p>The override mechanism requires to define a subclass of 20 * <code>BidiClassifier</code> which overrides the <code>classifier</code> 21 * method to assign customized Bidi classes.</p> 22 * 23 * <p>This may be useful for assigning Bidi classes to PUA characters, or 24 * for special application needs. For instance, an application may want to 25 * handle all spaces like L or R characters (according to the base direction) 26 * when creating the visual ordering of logical lines which are part of a report 27 * organized in columns: there should not be interaction between adjacent 28 * cells.</p> 29 * 30 * <p>To start using this customized 31 * classifier with a Bidi object, it must be specified by calling the 32 * <code>Bidi.setCustomClassifier</code> method; after that, the method 33 * <code>classify</code> of the custom <code>BidiClassifier</code> will be 34 * called by the UBA implementation any time the class of a character is 35 * to be determined.</p> 36 * 37 * @see Bidi#setCustomClassifier 38 * @hide Only a subset of ICU is exposed in Android 39 */ 40 41 public /*abstract*/ class BidiClassifier { 42 43 /** 44 * This object can be used for any purpose by the caller to pass 45 * information to the BidiClassifier methods, and by the BidiClassifier 46 * methods themselves.<br> 47 * For instance, this object can be used to save a reference to 48 * a previous custom BidiClassifier while setting a new one, so as to 49 * allow chaining between them. 50 */ 51 protected Object context; 52 53 /** 54 * @param context Context for this classifier instance. 55 * May be null. 56 */ 57 public BidiClassifier(Object context) { 58 this.context = context; 59 } 60 61 /** 62 * Sets classifier context, which can be used either by a caller or 63 * callee for various purposes. 64 * 65 * @param context Context for this classifier instance. 66 * May be null. 67 */ 68 public void setContext(Object context) { 69 this.context = context; 70 } 71 72 /** 73 * Returns the current classifier context. 74 */ 75 public Object getContext() { 76 return this.context; 77 } 78 79 /** 80 * Gets customized Bidi class for the code point <code>c</code>. 81 * <p> 82 * Default implementation, to be overridden. 83 * 84 * @param c Code point to be classified. 85 * @return An integer representing directional property / Bidi class for the 86 * given code point <code>c</code>, or Bidi.CLASS_DEFAULT=UCharacter.getIntPropertyMaxValue(UProperty.BIDI_CLASS)+1 87 * to signify that there is no need to override the standard Bidi class for 88 * the given code point. 89 * @see Bidi#CLASS_DEFAULT 90 */ 91 public int classify(int c) { 92 return Bidi.CLASS_DEFAULT; 93 } 94 } 95
