1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.inputmethod.latin.makedict;
import com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.CharEncoding;
import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
import com.android.inputmethod.latin.makedict.decoder.HeaderReader;
import com.android.inputmethod.latin.utils.ByteArrayDictBuffer;
import com.android.inputmethod.latin.utils.JniUtils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.HashMap;
@UsedForTesting
public class BinaryDictDecoder implements HeaderReader {
static {
JniUtils.loadNativeLibrary();
}
// TODO: implement something sensical instead of just a phony method
private static native int doNothing();
public interface DictionaryBufferFactory {
public DictBuffer getDictionaryBuffer(final File file)
throws FileNotFoundException, IOException;
}
/**
* Creates DictionaryBuffer using a ByteBuffer
*
* This class uses less memory than DictionaryBufferFromByteArrayFactory,
* but doesn't perform as fast.
* When operating on a big dictionary, this class is preferred.
*/
public static final class DictionaryBufferFromReadOnlyByteBufferFactory
implements DictionaryBufferFactory {
@Override
public DictBuffer getDictionaryBuffer(final File file)
throws FileNotFoundException, IOException {
FileInputStream inStream = null;
ByteBuffer buffer = null;
try {
inStream = new FileInputStream(file);
buffer = inStream.getChannel().map(FileChannel.MapMode.READ_ONLY,
0, file.length());
} finally {
if (inStream != null) {
inStream.close();
}
}
if (buffer != null) {
return new BinaryDictDecoderUtils.ByteBufferDictBuffer(buffer);
}
return null;
}
}
/**
* Creates DictionaryBuffer using a byte array
*
* This class performs faster than other classes, but consumes more memory.
* When operating on a small dictionary, this class is preferred.
*/
public static final class DictionaryBufferFromByteArrayFactory
implements DictionaryBufferFactory {
@Override
public DictBuffer getDictionaryBuffer(final File file)
throws FileNotFoundException, IOException {
FileInputStream inStream = null;
try {
inStream = new FileInputStream(file);
final byte[] array = new byte[(int) file.length()];
inStream.read(array);
return new ByteArrayDictBuffer(array);
} finally {
if (inStream != null) {
inStream.close();
}
}
}
}
/**
* Creates DictionaryBuffer using a writable ByteBuffer and a RandomAccessFile.
*
* This class doesn't perform as fast as other classes,
* but this class is the only option available for destructive operations (insert or delete)
* on a dictionary.
*/
@UsedForTesting
public static final class DictionaryBufferFromWritableByteBufferFactory
implements DictionaryBufferFactory {
@Override
public DictBuffer getDictionaryBuffer(final File file)
throws FileNotFoundException, IOException {
RandomAccessFile raFile = null;
ByteBuffer buffer = null;
try {
raFile = new RandomAccessFile(file, "rw");
buffer = raFile.getChannel().map(FileChannel.MapMode.READ_WRITE, 0, file.length());
} finally {
if (raFile != null) {
raFile.close();
}
}
if (buffer != null) {
return new BinaryDictDecoderUtils.ByteBufferDictBuffer(buffer);
}
return null;
}
}
private final File mDictionaryBinaryFile;
private DictBuffer mDictBuffer;
public BinaryDictDecoder(final File file) {
mDictionaryBinaryFile = file;
mDictBuffer = null;
}
public void openDictBuffer(final DictionaryBufferFactory factory)
throws FileNotFoundException, IOException {
mDictBuffer = factory.getDictionaryBuffer(mDictionaryBinaryFile);
}
public DictBuffer getDictBuffer() {
return mDictBuffer;
}
@UsedForTesting
public DictBuffer openAndGetDictBuffer(
final DictionaryBufferFactory factory)
throws FileNotFoundException, IOException {
openDictBuffer(factory);
return getDictBuffer();
}
// The implementation of HeaderReader
@Override
public int readVersion() throws IOException, UnsupportedFormatException {
return BinaryDictDecoderUtils.checkFormatVersion(mDictBuffer);
}
@Override
public int readOptionFlags() {
return mDictBuffer.readUnsignedShort();
}
@Override
public int readHeaderSize() {
return mDictBuffer.readInt();
}
@Override
public HashMap<String, String> readAttributes(final int headerSize) {
final HashMap<String, String> attributes = new HashMap<String, String>();
while (mDictBuffer.position() < headerSize) {
// We can avoid infinite loop here since mFusionDictonary.position() is always increased
// by calling CharEncoding.readString.
final String key = CharEncoding.readString(mDictBuffer);
final String value = CharEncoding.readString(mDictBuffer);
attributes.put(key, value);
}
mDictBuffer.position(headerSize);
return attributes;
}
}
|
