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
17package libcore.icu;
18
19import java.text.CharacterIterator;
20import java.text.StringCharacterIterator;
21import java.util.Locale;
22
23public 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