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) 2010-2014, International Business Machines 7 * Corporation and others. All Rights Reserved. 8 ******************************************************************************* 9 * UTF16CollationIterator.java, ported from utf16collationiterator.h/.cpp 10 * 11 * C++ version created on: 2010oct27 12 * created by: Markus W. Scherer 13 */ 14 15 package android.icu.impl.coll; 16 17 /** 18 * UTF-16 collation element and character iterator. 19 * Handles normalized UTF-16 text, with length or NUL-terminated. 20 * Unnormalized text is handled by a subclass. 21 * @hide Only a subset of ICU is exposed in Android 22 */ 23 public class UTF16CollationIterator extends CollationIterator { 24 /** 25 * Partial constructor, see {@link CollationIterator#CollationIterator(CollationData)}. 26 */ 27 public UTF16CollationIterator(CollationData d) { 28 super(d); 29 } 30 31 public UTF16CollationIterator(CollationData d, boolean numeric, CharSequence s, int p) { 32 super(d, numeric); 33 seq = s; 34 start = 0; 35 pos = p; 36 limit = s.length(); 37 } 38 39 @Override 40 public boolean equals(Object other) { 41 if(!super.equals(other)) { return false; } 42 UTF16CollationIterator o = (UTF16CollationIterator)other; 43 // Compare the iterator state but not the text: Assume that the caller does that. 44 return (pos - start) == (o.pos - o.start); 45 } 46 47 @Override 48 public int hashCode() { 49 assert false : "hashCode not designed"; 50 return 42; // any arbitrary constant will do 51 } 52 53 @Override 54 public void resetToOffset(int newOffset) { 55 reset(); 56 pos = start + newOffset; 57 } 58 59 @Override 60 public int getOffset() { 61 return pos - start; 62 } 63 64 public void setText(boolean numeric, CharSequence s, int p) { 65 reset(numeric); 66 seq = s; 67 start = 0; 68 pos = p; 69 limit = s.length(); 70 } 71 72 @Override 73 public int nextCodePoint() { 74 if(pos == limit) { 75 return Collation.SENTINEL_CP; 76 } 77 char c = seq.charAt(pos++); 78 char trail; 79 if(Character.isHighSurrogate(c) && pos != limit && 80 Character.isLowSurrogate(trail = seq.charAt(pos))) { 81 ++pos; 82 return Character.toCodePoint(c, trail); 83 } else { 84 return c; 85 } 86 } 87 88 @Override 89 public int previousCodePoint() { 90 if(pos == start) { 91 return Collation.SENTINEL_CP; 92 } 93 char c = seq.charAt(--pos); 94 char lead; 95 if(Character.isLowSurrogate(c) && pos != start && 96 Character.isHighSurrogate(lead = seq.charAt(pos - 1))) { 97 --pos; 98 return Character.toCodePoint(lead, c); 99 } else { 100 return c; 101 } 102 } 103 104 @Override 105 protected long handleNextCE32() { 106 if(pos == limit) { 107 return NO_CP_AND_CE32; 108 } 109 char c = seq.charAt(pos++); 110 return makeCodePointAndCE32Pair(c, trie.getFromU16SingleLead(c)); 111 } 112 113 @Override 114 protected char handleGetTrailSurrogate() { 115 if(pos == limit) { return 0; } 116 char trail; 117 if(Character.isLowSurrogate(trail = seq.charAt(pos))) { ++pos; } 118 return trail; 119 } 120 121 /* boolean foundNULTerminator(); */ 122 123 @Override 124 protected void forwardNumCodePoints(int num) { 125 while(num > 0 && pos != limit) { 126 char c = seq.charAt(pos++); 127 --num; 128 if(Character.isHighSurrogate(c) && pos != limit && 129 Character.isLowSurrogate(seq.charAt(pos))) { 130 ++pos; 131 } 132 } 133 } 134 135 @Override 136 protected void backwardNumCodePoints(int num) { 137 while(num > 0 && pos != start) { 138 char c = seq.charAt(--pos); 139 --num; 140 if(Character.isLowSurrogate(c) && pos != start && 141 Character.isHighSurrogate(seq.charAt(pos-1))) { 142 --pos; 143 } 144 } 145 } 146 147 protected CharSequence seq; 148 protected int start; 149 protected int pos; 150 protected int limit; 151 } 152
