1 /* 2 * Copyright (C) 2008 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 libcore.icu; 18 19 import java.text.CharacterIterator; 20 import java.text.StringCharacterIterator; 21 import java.util.Locale; 22 23 public final class NativeBreakIterator implements Cloneable { 24 // Acceptable values for the 'type' field. 25 private static final int BI_CHAR_INSTANCE = 1; 26 private static final int BI_WORD_INSTANCE = 2; 27 private static final int BI_LINE_INSTANCE = 3; 28 private static final int BI_SENT_INSTANCE = 4; 29 30 // The address of the native peer. 31 // Uses of this must be manually synchronized to avoid native crashes. 32 private final long address; 33 34 private final int type; 35 private String string; 36 private CharacterIterator charIterator; 37 38 private NativeBreakIterator(long address, int type) { 39 this.address = address; 40 this.type = type; 41 this.charIterator = new StringCharacterIterator(""); 42 } 43 44 @Override 45 public Object clone() { 46 long cloneAddr = cloneImpl(this.address); 47 NativeBreakIterator clone = new NativeBreakIterator(cloneAddr, this.type); 48 clone.string = this.string; 49 // The RI doesn't clone the CharacterIterator. 50 clone.charIterator = this.charIterator; 51 return clone; 52 } 53 54 @Override 55 public boolean equals(Object object) { 56 if (object == this) { 57 return true; 58 } 59 if (!(object instanceof NativeBreakIterator)) { 60 return false; 61 } 62 // TODO: is this sufficient? shouldn't we be checking the underlying rules? 63 NativeBreakIterator rhs = (NativeBreakIterator) object; 64 return type == rhs.type && charIterator.equals(rhs.charIterator); 65 } 66 67 @Override 68 public int hashCode() { 69 return 42; // No-one uses BreakIterator as a hash key. 70 } 71 72 @Override protected void finalize() throws Throwable { 73 try { 74 closeImpl(this.address); 75 } finally { 76 super.finalize(); 77 } 78 } 79 80 public int current() { 81 return currentImpl(this.address, this.string); 82 } 83 84 public int first() { 85 return firstImpl(this.address, this.string); 86 } 87 88 public int following(int offset) { 89 return followingImpl(this.address, this.string, offset); 90 } 91 92 public CharacterIterator getText() { 93 int newLocation = currentImpl(this.address, this.string); 94 this.charIterator.setIndex(newLocation); 95 return this.charIterator; 96 } 97 98 public int last() { 99 return lastImpl(this.address, this.string); 100 } 101 102 public int next(int n) { 103 return nextImpl(this.address, this.string, n); 104 } 105 106 public int next() { 107 return nextImpl(this.address, this.string, 1); 108 } 109 110 public int previous() { 111 return previousImpl(this.address, this.string); 112 } 113 114 public void setText(CharacterIterator newText) { 115 StringBuilder sb = new StringBuilder(); 116 for (char c = newText.first(); c != CharacterIterator.DONE; c = newText.next()) { 117 sb.append(c); 118 } 119 setText(sb.toString(), newText); 120 } 121 122 public void setText(String newText) { 123 setText(newText, new StringCharacterIterator(newText)); 124 } 125 126 private void setText(String s, CharacterIterator it) { 127 this.string = s; 128 this.charIterator = it; 129 setTextImpl(this.address, this.string); 130 } 131 132 public boolean hasText() { 133 return (string != null); 134 } 135 136 public boolean isBoundary(int offset) { 137 return isBoundaryImpl(this.address, this.string, offset); 138 } 139 140 public int preceding(int offset) { 141 return precedingImpl(this.address, this.string, offset); 142 } 143 144 public static NativeBreakIterator getCharacterInstance(Locale locale) { 145 return new NativeBreakIterator(getCharacterInstanceImpl(locale.toLanguageTag()), BI_CHAR_INSTANCE); 146 } 147 148 public static NativeBreakIterator getLineInstance(Locale locale) { 149 return new NativeBreakIterator(getLineInstanceImpl(locale.toLanguageTag()), BI_LINE_INSTANCE); 150 } 151 152 public static NativeBreakIterator getSentenceInstance(Locale locale) { 153 return new NativeBreakIterator(getSentenceInstanceImpl(locale.toLanguageTag()), BI_SENT_INSTANCE); 154 } 155 156 public static NativeBreakIterator getWordInstance(Locale locale) { 157 return new NativeBreakIterator(getWordInstanceImpl(locale.toLanguageTag()), BI_WORD_INSTANCE); 158 } 159 160 private static native long getCharacterInstanceImpl(String locale); 161 private static native long getWordInstanceImpl(String locale); 162 private static native long getLineInstanceImpl(String locale); 163 private static native long getSentenceInstanceImpl(String locale); 164 private static synchronized native long cloneImpl(long address); 165 166 private static synchronized native void closeImpl(long address); 167 168 private static synchronized native void setTextImpl(long address, String text); 169 private static synchronized native int precedingImpl(long address, String text, int offset); 170 private static synchronized native boolean isBoundaryImpl(long address, String text, int offset); 171 private static synchronized native int nextImpl(long address, String text, int n); 172 private static synchronized native int previousImpl(long address, String text); 173 private static synchronized native int currentImpl(long address, String text); 174 private static synchronized native int firstImpl(long address, String text); 175 private static synchronized native int followingImpl(long address, String text, int offset); 176 private static synchronized native int lastImpl(long address, String text); 177 } 178
