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Use ByteBuffer when reading FusionDictionary from file. 

Change-Id: Ia71561648e17f846d277c22309ac37c21c67a537
main
Yuichiro Hanada 2012-08-21 18:30:18 +09:00
parent b28139f51b
commit d4fe7fda30
4 changed files with 399 additions and 99 deletions
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27
java/src/com/android/inputmethod/latin/BinaryDictionaryGetter.java
View File

@ -25,7 +25,10 @@ import android.content.res.AssetFileDescriptor;
import android.util.Log;
import java.io.File;
import java.io.RandomAccessFile;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
@ -349,17 +352,21 @@ class BinaryDictionaryGetter {
// ad-hock ## HACK ##
if (!Locale.ENGLISH.getLanguage().equals(locale.getLanguage())) return true;
FileInputStream inStream = null;
try {
// Read the version of the file
final RandomAccessFile raf = new RandomAccessFile(f, "r");
final int magic = raf.readInt();
inStream = new FileInputStream(f);
final ByteBuffer buffer = inStream.getChannel().map(
FileChannel.MapMode.READ_ONLY, 0, f.length());
final int magic = buffer.getInt();
if (magic != BinaryDictInputOutput.VERSION_2_MAGIC_NUMBER) {
return false;
}
final int formatVersion = raf.readInt();
final int headerSize = raf.readInt();
final int formatVersion = buffer.getInt();
final int headerSize = buffer.getInt();
final HashMap<String, String> options = CollectionUtils.newHashMap();
BinaryDictInputOutput.populateOptionsFromFile(raf, headerSize, options);
BinaryDictInputOutput.populateOptions(buffer, headerSize, options);
final String version = options.get(VERSION_KEY);
if (null == version) {
// No version in the options : the format is unexpected
@ -374,6 +381,14 @@ class BinaryDictionaryGetter {
return false;
} catch (NumberFormatException e) {
return false;
} finally {
if (inStream != null) {
try {
inStream.close();
} catch (IOException e) {
// do nothing
}
}
}
}

225
java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
View File

@ -22,10 +22,13 @@ import com.android.inputmethod.latin.makedict.FusionDictionary.Node;
import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
@ -307,33 +310,32 @@ public class BinaryDictInputOutput {
}
/**
* Reads a string from a RandomAccessFile. This is the converse of the above method.
* Reads a string from a ByteBuffer. This is the converse of the above method.
*/
private static String readString(final RandomAccessFile source) throws IOException {
private static String readString(final ByteBuffer buffer) {
final StringBuilder s = new StringBuilder();
int character = readChar(source);
int character = readChar(buffer);
while (character != INVALID_CHARACTER) {
s.appendCodePoint(character);
character = readChar(source);
character = readChar(buffer);
}
return s.toString();
}
/**
* Reads a character from the file.
* Reads a character from the ByteBuffer.
*
* This follows the character format documented earlier in this source file.
*
* @param source the file, positioned over an encoded character.
* @param buffer the buffer, positioned over an encoded character.
* @return the character code.
*/
private static int readChar(RandomAccessFile source) throws IOException {
int character = source.readUnsignedByte();
private static int readChar(final ByteBuffer buffer) {
int character = readUnsignedByte(buffer);
if (!fitsOnOneByte(character)) {
if (GROUP_CHARACTERS_TERMINATOR == character)
return INVALID_CHARACTER;
if (GROUP_CHARACTERS_TERMINATOR == character) return INVALID_CHARACTER;
character <<= 16;
character += source.readUnsignedShort();
character += readUnsignedShort(buffer);
}
return character;
}
@ -1091,46 +1093,46 @@ public class BinaryDictInputOutput {
// readDictionaryBinary is the public entry point for them.
static final int[] characterBuffer = new int[MAX_WORD_LENGTH];
private static CharGroupInfo readCharGroup(RandomAccessFile source,
final int originalGroupAddress) throws IOException {
private static CharGroupInfo readCharGroup(final ByteBuffer buffer,
final int originalGroupAddress) {
int addressPointer = originalGroupAddress;
final int flags = source.readUnsignedByte();
final int flags = readUnsignedByte(buffer);
++addressPointer;
final int characters[];
if (0 != (flags & FLAG_HAS_MULTIPLE_CHARS)) {
int index = 0;
int character = CharEncoding.readChar(source);
int character = CharEncoding.readChar(buffer);
addressPointer += CharEncoding.getCharSize(character);
while (-1 != character) {
characterBuffer[index++] = character;
character = CharEncoding.readChar(source);
character = CharEncoding.readChar(buffer);
addressPointer += CharEncoding.getCharSize(character);
}
characters = Arrays.copyOfRange(characterBuffer, 0, index);
} else {
final int character = CharEncoding.readChar(source);
final int character = CharEncoding.readChar(buffer);
addressPointer += CharEncoding.getCharSize(character);
characters = new int[] { character };
}
final int frequency;
if (0 != (FLAG_IS_TERMINAL & flags)) {
++addressPointer;
frequency = source.readUnsignedByte();
frequency = readUnsignedByte(buffer);
} else {
frequency = CharGroup.NOT_A_TERMINAL;
}
int childrenAddress = addressPointer;
switch (flags & MASK_GROUP_ADDRESS_TYPE) {
case FLAG_GROUP_ADDRESS_TYPE_ONEBYTE:
childrenAddress += source.readUnsignedByte();
childrenAddress += readUnsignedByte(buffer);
addressPointer += 1;
break;
case FLAG_GROUP_ADDRESS_TYPE_TWOBYTES:
childrenAddress += source.readUnsignedShort();
childrenAddress += readUnsignedShort(buffer);
addressPointer += 2;
break;
case FLAG_GROUP_ADDRESS_TYPE_THREEBYTES:
childrenAddress += (source.readUnsignedByte() << 16) + source.readUnsignedShort();
childrenAddress += readUnsignedInt24(buffer);
addressPointer += 3;
break;
case FLAG_GROUP_ADDRESS_TYPE_NOADDRESS:
@ -1140,38 +1142,38 @@ public class BinaryDictInputOutput {
}
ArrayList<WeightedString> shortcutTargets = null;
if (0 != (flags & FLAG_HAS_SHORTCUT_TARGETS)) {
final long pointerBefore = source.getFilePointer();
final int pointerBefore = buffer.position();
shortcutTargets = new ArrayList<WeightedString>();
source.readUnsignedShort(); // Skip the size
buffer.getShort(); // Skip the size
while (true) {
final int targetFlags = source.readUnsignedByte();
final String word = CharEncoding.readString(source);
final int targetFlags = readUnsignedByte(buffer);
final String word = CharEncoding.readString(buffer);
shortcutTargets.add(new WeightedString(word,
targetFlags & FLAG_ATTRIBUTE_FREQUENCY));
if (0 == (targetFlags & FLAG_ATTRIBUTE_HAS_NEXT)) break;
}
addressPointer += (source.getFilePointer() - pointerBefore);
addressPointer += buffer.position() - pointerBefore;
}
ArrayList<PendingAttribute> bigrams = null;
if (0 != (flags & FLAG_HAS_BIGRAMS)) {
bigrams = new ArrayList<PendingAttribute>();
while (true) {
final int bigramFlags = source.readUnsignedByte();
final int bigramFlags = readUnsignedByte(buffer);
++addressPointer;
final int sign = 0 == (bigramFlags & FLAG_ATTRIBUTE_OFFSET_NEGATIVE) ? 1 : -1;
int bigramAddress = addressPointer;
switch (bigramFlags & MASK_ATTRIBUTE_ADDRESS_TYPE) {
case FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE:
bigramAddress += sign * source.readUnsignedByte();
bigramAddress += sign * readUnsignedByte(buffer);
addressPointer += 1;
break;
case FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES:
bigramAddress += sign * source.readUnsignedShort();
bigramAddress += sign * readUnsignedShort(buffer);
addressPointer += 2;
break;
case FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES:
final int offset = ((source.readUnsignedByte() << 16)
+ source.readUnsignedShort());
final int offset = (readUnsignedByte(buffer) << 16)
+ readUnsignedShort(buffer);
bigramAddress += sign * offset;
addressPointer += 3;
break;
@ -1188,15 +1190,15 @@ public class BinaryDictInputOutput {
}
/**
* Reads and returns the char group count out of a file and forwards the pointer.
* Reads and returns the char group count out of a buffer and forwards the pointer.
*/
private static int readCharGroupCount(RandomAccessFile source) throws IOException {
final int msb = source.readUnsignedByte();
private static int readCharGroupCount(final ByteBuffer buffer) {
final int msb = readUnsignedByte(buffer);
if (MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT >= msb) {
return msb;
} else {
return ((MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT & msb) << 8)
+ source.readUnsignedByte();
+ readUnsignedByte(buffer);
}
}
@ -1204,31 +1206,29 @@ public class BinaryDictInputOutput {
// of this method. Since it performs direct, unbuffered random access to the file and
// may be called hundreds of thousands of times, the resulting performance is not
// reasonable without some kind of cache. Thus:
// TODO: perform buffered I/O here and in other places in the code.
private static TreeMap<Integer, String> wordCache = new TreeMap<Integer, String>();
/**
* Finds, as a string, the word at the address passed as an argument.
*
* @param source the file to read from.
* @param buffer the buffer to read from.
* @param headerSize the size of the header.
* @param address the address to seek.
* @return the word, as a string.
* @throws IOException if the file can't be read.
*/
private static String getWordAtAddress(final RandomAccessFile source, final long headerSize,
int address) throws IOException {
private static String getWordAtAddress(final ByteBuffer buffer, final int headerSize,
final int address) {
final String cachedString = wordCache.get(address);
if (null != cachedString) return cachedString;
final long originalPointer = source.getFilePointer();
source.seek(headerSize);
final int count = readCharGroupCount(source);
final int originalPointer = buffer.position();
buffer.position(headerSize);
final int count = readCharGroupCount(buffer);
int groupOffset = getGroupCountSize(count);
final StringBuilder builder = new StringBuilder();
String result = null;
CharGroupInfo last = null;
for (int i = count - 1; i >= 0; --i) {
CharGroupInfo info = readCharGroup(source, groupOffset);
CharGroupInfo info = readCharGroup(buffer, groupOffset);
groupOffset = info.mEndAddress;
if (info.mOriginalAddress == address) {
builder.append(new String(info.mCharacters, 0, info.mCharacters.length));
@ -1239,9 +1239,9 @@ public class BinaryDictInputOutput {
if (info.mChildrenAddress > address) {
if (null == last) continue;
builder.append(new String(last.mCharacters, 0, last.mCharacters.length));
source.seek(last.mChildrenAddress + headerSize);
buffer.position(last.mChildrenAddress + headerSize);
groupOffset = last.mChildrenAddress + 1;
i = source.readUnsignedByte();
i = readUnsignedByte(buffer);
last = null;
continue;
}
@ -1249,14 +1249,14 @@ public class BinaryDictInputOutput {
}
if (0 == i && hasChildrenAddress(last.mChildrenAddress)) {
builder.append(new String(last.mCharacters, 0, last.mCharacters.length));
source.seek(last.mChildrenAddress + headerSize);
buffer.position(last.mChildrenAddress + headerSize);
groupOffset = last.mChildrenAddress + 1;
i = source.readUnsignedByte();
i = readUnsignedByte(buffer);
last = null;
continue;
}
}
source.seek(originalPointer);
buffer.position(originalPointer);
wordCache.put(address, result);
return result;
}
@ -1269,44 +1269,47 @@ public class BinaryDictInputOutput {
* This will recursively read other nodes into the structure, populating the reverse
* maps on the fly and using them to keep track of already read nodes.
*
* @param source the data file, correctly positioned at the start of a node.
* @param buffer the buffer, correctly positioned at the start of a node.
* @param headerSize the size, in bytes, of the file header.
* @param reverseNodeMap a mapping from addresses to already read nodes.
* @param reverseGroupMap a mapping from addresses to already read character groups.
* @return the read node with all his children already read.
*/
private static Node readNode(RandomAccessFile source, long headerSize,
Map<Integer, Node> reverseNodeMap, Map<Integer, CharGroup> reverseGroupMap)
private static Node readNode(final ByteBuffer buffer, final int headerSize,
final Map<Integer, Node> reverseNodeMap, final Map<Integer, CharGroup> reverseGroupMap)
throws IOException {
final int nodeOrigin = (int)(source.getFilePointer() - headerSize);
final int count = readCharGroupCount(source);
final int nodeOrigin = buffer.position() - headerSize;
final int count = readCharGroupCount(buffer);
final ArrayList<CharGroup> nodeContents = new ArrayList<CharGroup>();
int groupOffset = nodeOrigin + getGroupCountSize(count);
for (int i = count; i > 0; --i) {
CharGroupInfo info = readCharGroup(source, groupOffset);
CharGroupInfo info =readCharGroup(buffer, groupOffset);
ArrayList<WeightedString> shortcutTargets = info.mShortcutTargets;
ArrayList<WeightedString> bigrams = null;
if (null != info.mBigrams) {
bigrams = new ArrayList<WeightedString>();
for (PendingAttribute bigram : info.mBigrams) {
final String word = getWordAtAddress(source, headerSize, bigram.mAddress);
final String word = getWordAtAddress(
buffer, headerSize, bigram.mAddress);
bigrams.add(new WeightedString(word, bigram.mFrequency));
}
}
if (hasChildrenAddress(info.mChildrenAddress)) {
Node children = reverseNodeMap.get(info.mChildrenAddress);
if (null == children) {
final long currentPosition = source.getFilePointer();
source.seek(info.mChildrenAddress + headerSize);
children = readNode(source, headerSize, reverseNodeMap, reverseGroupMap);
source.seek(currentPosition);
final int currentPosition = buffer.position();
buffer.position(info.mChildrenAddress + headerSize);
children = readNode(
buffer, headerSize, reverseNodeMap, reverseGroupMap);
buffer.position(currentPosition);
}
nodeContents.add(
new CharGroup(info.mCharacters, shortcutTargets, bigrams, info.mFrequency,
children));
new CharGroup(info.mCharacters, shortcutTargets,
bigrams, info.mFrequency, children));
} else {
nodeContents.add(
new CharGroup(info.mCharacters, shortcutTargets, bigrams, info.mFrequency));
new CharGroup(info.mCharacters, shortcutTargets,
bigrams, info.mFrequency));
}
groupOffset = info.mEndAddress;
}
@ -1318,12 +1321,13 @@ public class BinaryDictInputOutput {
/**
* Helper function to get the binary format version from the header.
* @throws IOException
*/
private static int getFormatVersion(final RandomAccessFile source) throws IOException {
final int magic_v1 = source.readUnsignedShort();
if (VERSION_1_MAGIC_NUMBER == magic_v1) return source.readUnsignedByte();
final int magic_v2 = (magic_v1 << 16) + source.readUnsignedShort();
if (VERSION_2_MAGIC_NUMBER == magic_v2) return source.readUnsignedShort();
private static int getFormatVersion(final ByteBuffer buffer) throws IOException {
final int magic_v1 = readUnsignedShort(buffer);
if (VERSION_1_MAGIC_NUMBER == magic_v1) return readUnsignedByte(buffer);
final int magic_v2 = (magic_v1 << 16) + readUnsignedShort(buffer);
if (VERSION_2_MAGIC_NUMBER == magic_v2) return readUnsignedShort(buffer);
return NOT_A_VERSION_NUMBER;
}
@ -1333,53 +1337,60 @@ public class BinaryDictInputOutput {
* The file is read at the current file pointer, so the caller must take care the pointer
* is in the right place before calling this.
*/
public static void populateOptionsFromFile(final RandomAccessFile source, final long headerSize,
final HashMap<String, String> options) throws IOException {
while (source.getFilePointer() < headerSize) {
final String key = CharEncoding.readString(source);
final String value = CharEncoding.readString(source);
public static void populateOptions(final ByteBuffer buffer, final int headerSize,
final HashMap<String, String> options) {
while (buffer.position() < headerSize) {
final String key = CharEncoding.readString(buffer);
final String value = CharEncoding.readString(buffer);
options.put(key, value);
}
}
/**
* Reads a random access file and returns the memory representation of the dictionary.
* Reads a byte buffer and returns the memory representation of the dictionary.
*
* This high-level method takes a binary file and reads its contents, populating a
* FusionDictionary structure. The optional dict argument is an existing dictionary to
* which words from the file should be added. If it is null, a new dictionary is created.
*
* @param source the file to read.
* @param buffer the buffer to read.
* @param dict an optional dictionary to add words to, or null.
* @return the created (or merged) dictionary.
*/
public static FusionDictionary readDictionaryBinary(final RandomAccessFile source,
public static FusionDictionary readDictionaryBinary(final ByteBuffer buffer,
final FusionDictionary dict) throws IOException, UnsupportedFormatException {
// Check file version
final int version = getFormatVersion(source);
if (version < MINIMUM_SUPPORTED_VERSION || version > MAXIMUM_SUPPORTED_VERSION ) {
final int version = getFormatVersion(buffer);
if (version < MINIMUM_SUPPORTED_VERSION || version > MAXIMUM_SUPPORTED_VERSION) {
throw new UnsupportedFormatException("This file has version " + version
+ ", but this implementation does not support versions above "
+ MAXIMUM_SUPPORTED_VERSION);
}
// Read options
final int optionsFlags = source.readUnsignedShort();
// clear cache
wordCache.clear();
final long headerSize;
// Read options
final int optionsFlags = readUnsignedShort(buffer);
final int headerSize;
final HashMap<String, String> options = new HashMap<String, String>();
if (version < FIRST_VERSION_WITH_HEADER_SIZE) {
headerSize = source.getFilePointer();
headerSize = buffer.position();
} else {
headerSize = (source.readUnsignedByte() << 24) + (source.readUnsignedByte() << 16)
+ (source.readUnsignedByte() << 8) + source.readUnsignedByte();
populateOptionsFromFile(source, headerSize, options);
source.seek(headerSize);
headerSize = buffer.getInt();
populateOptions(buffer, headerSize, options);
buffer.position(headerSize);
}
if (headerSize < 0) {
throw new UnsupportedFormatException("header size can't be negative.");
}
Map<Integer, Node> reverseNodeMapping = new TreeMap<Integer, Node>();
Map<Integer, CharGroup> reverseGroupMapping = new TreeMap<Integer, CharGroup>();
final Node root = readNode(source, headerSize, reverseNodeMapping, reverseGroupMapping);
final Node root = readNode(
buffer, headerSize, reverseNodeMapping, reverseGroupMapping);
FusionDictionary newDict = new FusionDictionary(root,
new FusionDictionary.DictionaryOptions(options,
@ -1402,6 +1413,28 @@ public class BinaryDictInputOutput {
return newDict;
}
/**
* Helper function to read one byte from ByteBuffer.
*/
private static int readUnsignedByte(final ByteBuffer buffer) {
return ((int)buffer.get()) & 0xFF;
}
/**
* Helper function to read two byte from ByteBuffer.
*/
private static int readUnsignedShort(final ByteBuffer buffer) {
return ((int)buffer.getShort()) & 0xFFFF;
}
/**
* Helper function to read three byte from ByteBuffer.
*/
private static int readUnsignedInt24(final ByteBuffer buffer) {
final int value = readUnsignedByte(buffer) << 16;
return value + readUnsignedShort(buffer);
}
/**
* Basic test to find out whether the file is a binary dictionary or not.
*
@ -1411,14 +1444,26 @@ public class BinaryDictInputOutput {
* @return true if it's a binary dictionary, false otherwise
*/
public static boolean isBinaryDictionary(final String filename) {
FileInputStream inStream = null;
try {
RandomAccessFile f = new RandomAccessFile(filename, "r");
final int version = getFormatVersion(f);
final File file = new File(filename);
inStream = new FileInputStream(file);
final ByteBuffer buffer = inStream.getChannel().map(
FileChannel.MapMode.READ_ONLY, 0, file.length());
final int version = getFormatVersion(buffer);
return (version >= MINIMUM_SUPPORTED_VERSION && version <= MAXIMUM_SUPPORTED_VERSION);
} catch (FileNotFoundException e) {
return false;
} catch (IOException e) {
return false;
} finally {
if (inStream != null) {
try {
inStream.close();
} catch (IOException e) {
// do nothing
}
}
}
}

224
tests/src/com/android/inputmethod/latin/BinaryDictIOTests.java Normal file
View File

@ -0,0 +1,224 @@
/*
* Copyright (C) 2012 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;
import com.android.inputmethod.latin.makedict.BinaryDictInputOutput;
import com.android.inputmethod.latin.makedict.FusionDictionary;
import com.android.inputmethod.latin.makedict.FusionDictionary.CharGroup;
import com.android.inputmethod.latin.makedict.FusionDictionary.Node;
import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
import android.test.AndroidTestCase;
import android.util.Log;
import android.util.SparseArray;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Random;
import java.util.Set;
/**
* Unit tests for BinaryDictInputOutput
*/
public class BinaryDictIOTests extends AndroidTestCase {
private static final String TAG = BinaryDictIOTests.class.getSimpleName();
private static final int MAX_UNIGRAMS = 1000;
private static final int UNIGRAM_FREQ = 10;
private static final int BIGRAM_FREQ = 50;
private static final String[] CHARACTERS =
{
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"
};
/**
* Generates a random word.
*/
private String generateWord(final int value) {
final int lengthOfChars = CHARACTERS.length;
StringBuilder builder = new StringBuilder("a");
long lvalue = Math.abs((long)value);
while (lvalue > 0) {
builder.append(CHARACTERS[(int)(lvalue % lengthOfChars)]);
lvalue /= lengthOfChars;
}
return builder.toString();
}
private List<String> generateWords(final int number, final Random random) {
final Set<String> wordSet = CollectionUtils.newHashSet();
while (wordSet.size() < number) {
wordSet.add(generateWord(random.nextInt()));
}
return new ArrayList<String>(wordSet);
}
private void addUnigrams(final int number,
final FusionDictionary dict,
final List<String> words) {
for (int i = 0; i < number; ++i) {
final String word = words.get(i);
dict.add(word, UNIGRAM_FREQ, null);
}
}
private void addBigrams(final FusionDictionary dict,
final List<String> words,
final SparseArray<List<Integer>> sparseArray) {
for (int i = 0; i < sparseArray.size(); ++i) {
final int w1 = sparseArray.keyAt(i);
for (int w2 : sparseArray.valueAt(i)) {
dict.setBigram(words.get(w1), words.get(w2), BIGRAM_FREQ);
}
}
}
private long timeWritingDictToFile(final String fileName,
final FusionDictionary dict) {
final File file = new File(getContext().getFilesDir(), fileName);
long now = -1, diff = -1;
try {
final FileOutputStream out = new FileOutputStream(file);
now = System.currentTimeMillis();
BinaryDictInputOutput.writeDictionaryBinary(out, dict, 2);
diff = System.currentTimeMillis() - now;
out.flush();
out.close();
} catch (IOException e) {
Log.e(TAG, "IO exception while writing file: " + e);
} catch (UnsupportedFormatException e) {
Log.e(TAG, "UnsupportedFormatException: " + e);
}
return diff;
}
private void checkDictionary(final FusionDictionary dict,
final List<String> words,
final SparseArray<List<Integer>> bigrams) {
assertNotNull(dict);
// check unigram
for (final String word : words) {
final CharGroup cg = FusionDictionary.findWordInTree(dict.mRoot, word);
assertNotNull(cg);
}
// check bigram
for (int i = 0; i < bigrams.size(); ++i) {
final int w1 = bigrams.keyAt(i);
for (final int w2 : bigrams.valueAt(i)) {
final CharGroup cg = FusionDictionary.findWordInTree(dict.mRoot, words.get(w1));
assertNotNull(words.get(w1) + "," + words.get(w2), cg.getBigram(words.get(w2)));
}
}
}
private long timeReadingAndCheckDict(final String fileName,
final List<String> words,
final SparseArray<List<Integer>> bigrams) {
long now, diff = -1;
try {
final File file = new File(getContext().getFilesDir(), fileName);
final FileInputStream inStream = new FileInputStream(file);
final ByteBuffer buffer = inStream.getChannel().map(
FileChannel.MapMode.READ_ONLY, 0, file.length());
now = System.currentTimeMillis();
final FusionDictionary dict =
BinaryDictInputOutput.readDictionaryBinary(buffer, null);
diff = System.currentTimeMillis() - now;
checkDictionary(dict, words, bigrams);
return diff;
} catch (IOException e) {
Log.e(TAG, "raise IOException while reading file " + e);
} catch (UnsupportedFormatException e) {
Log.e(TAG, "Unsupported format: " + e);
}
return diff;
}
private String runReadAndWrite(final List<String> words,
final SparseArray<List<Integer>> bigrams,
final String message) {
final FusionDictionary dict = new FusionDictionary(new Node(),
new FusionDictionary.DictionaryOptions(
new HashMap<String,String>(), false, false));
final String fileName = generateWord((int)System.currentTimeMillis()) + ".dict";
addUnigrams(words.size(), dict, words);
addBigrams(dict, words, bigrams);
// check original dictionary
checkDictionary(dict, words, bigrams);
final long write = timeWritingDictToFile(fileName, dict);
final long read = timeReadingAndCheckDict(fileName, words, bigrams);
deleteFile(fileName);
return "PROF: read=" + read + "ms, write=" + write + "ms :" + message;
}
private void deleteFile(final String fileName) {
final File file = new File(getContext().getFilesDir(), fileName);
file.delete();
}
public void testReadAndWrite() {
final List<String> results = new ArrayList<String>();
final Random random = new Random(123456);
final List<String> words = generateWords(MAX_UNIGRAMS, random);
final SparseArray<List<Integer>> emptyArray = CollectionUtils.newSparseArray();
final SparseArray<List<Integer>> chain = CollectionUtils.newSparseArray();
for (int i = 0; i < words.size(); ++i) chain.put(i, new ArrayList<Integer>());
for (int i = 1; i < words.size(); ++i) chain.get(i-1).add(i);
final SparseArray<List<Integer>> star = CollectionUtils.newSparseArray();
final List<Integer> list0 = CollectionUtils.newArrayList();
star.put(0, list0);
for (int i = 1; i < words.size(); ++i) star.get(0).add(i);
results.add(runReadAndWrite(words, emptyArray, "only unigram"));
results.add(runReadAndWrite(words, chain, "chain"));
results.add(runReadAndWrite(words, star, "star"));
for (final String result : results) {
Log.d(TAG, result);
}
}
}

22
tools/dicttool/src/android/inputmethod/latin/dicttool/DictionaryMaker.java
View File

@ -27,7 +27,8 @@ import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.Arrays;
import java.util.LinkedList;
@ -238,8 +239,23 @@ public class DictionaryMaker {
*/
private static FusionDictionary readBinaryFile(final String binaryFilename)
throws FileNotFoundException, IOException, UnsupportedFormatException {
final RandomAccessFile inputFile = new RandomAccessFile(binaryFilename, "r");
return BinaryDictInputOutput.readDictionaryBinary(inputFile, null);
FileInputStream inStream = null;
try {
final File file = new File(binaryFilename);
inStream = new FileInputStream(file);
final ByteBuffer buffer = inStream.getChannel().map(
FileChannel.MapMode.READ_ONLY, 0, file.length());
return BinaryDictInputOutput.readDictionaryBinary(buffer, null);
} finally {
if (inStream != null) {
try {
inStream.close();
} catch (IOException e) {
// do nothing
}
}
}
}
/**