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Add getTerminalPosition. 

Change-Id: If04d779db23b1aea2cc12e5e9b8cecfcb35a5737
main
Yuichiro Hanada 2012-09-19 14:38:17 +09:00
parent 84c1bbd76d
commit d36245fad2
4 changed files with 163 additions and 4 deletions
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68
java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
View File

@ -16,10 +16,11 @@
package com.android.inputmethod.latin.makedict;
import com.android.inputmethod.latin.makedict.BinaryDictInputOutput;
import com.android.inputmethod.latin.Constants;
import com.android.inputmethod.latin.makedict.BinaryDictInputOutput.FusionDictionaryBufferInterface;
import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
import com.android.inputmethod.latin.makedict.FusionDictionary.CharGroup;
import java.io.IOException;
import java.util.ArrayList;
@ -124,4 +125,69 @@ public class BinaryDictIOUtils {
readUnigramsAndBigramsBinaryInner(buffer, header.mHeaderSize, words, frequencies, bigrams,
header.mFormatOptions);
}
/**
* Gets the address of the last CharGroup of the exact matching word in the dictionary.
* If no match is found, returns NOT_VALID_WORD.
*
* @param buffer the buffer to read.
* @param word the word we search for.
* @return the address of the terminal node.
* @throws IOException
* @throws UnsupportedFormatException
*/
public static int getTerminalPosition(final FusionDictionaryBufferInterface buffer,
final String word) throws IOException, UnsupportedFormatException {
if (word == null) return FormatSpec.NOT_VALID_WORD;
if (buffer.position() != 0) buffer.position(0);
final FileHeader header = BinaryDictInputOutput.readHeader(buffer);
int wordPos = 0;
final int wordLen = word.codePointCount(0, word.length());
for (int depth = 0; depth < Constants.Dictionary.MAX_WORD_LENGTH; ++depth) {
if (wordPos >= wordLen) return FormatSpec.NOT_VALID_WORD;
int groupOffset = buffer.position() - header.mHeaderSize;
final int charGroupCount = BinaryDictInputOutput.readCharGroupCount(buffer);
groupOffset += BinaryDictInputOutput.getGroupCountSize(charGroupCount);
for (int i = 0; i < charGroupCount; ++i) {
final int charGroupPos = buffer.position();
final CharGroupInfo currentInfo = BinaryDictInputOutput.readCharGroup(buffer,
buffer.position(), header.mFormatOptions);
boolean same = true;
for (int p = 0, j = word.offsetByCodePoints(0, wordPos);
p < currentInfo.mCharacters.length;
++p, j = word.offsetByCodePoints(j, 1)) {
if (wordPos + p >= wordLen
|| word.codePointAt(j) != currentInfo.mCharacters[p]) {
same = false;
break;
}
}
if (same) {
if (wordPos + currentInfo.mCharacters.length == wordLen) {
if (currentInfo.mFrequency == CharGroup.NOT_A_TERMINAL) {
return FormatSpec.NOT_VALID_WORD;
} else {
return charGroupPos;
}
}
wordPos += currentInfo.mCharacters.length;
if (currentInfo.mChildrenAddress == FormatSpec.NO_CHILDREN_ADDRESS) {
return FormatSpec.NOT_VALID_WORD;
}
buffer.position(currentInfo.mChildrenAddress);
break;
}
groupOffset = currentInfo.mEndAddress;
// not found
if (i >= charGroupCount - 1) {
return FormatSpec.NOT_VALID_WORD;
}
}
}
return FormatSpec.NOT_VALID_WORD;
}
}

5
java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
View File

@ -1242,8 +1242,9 @@ public class BinaryDictInputOutput {
* @param formatOptions file format options.
* @return the word, as a string.
*/
private static String getWordAtAddress(final FusionDictionaryBufferInterface buffer,
final int headerSize, final int address, final FormatOptions formatOptions) {
/* packages for tests */ static String getWordAtAddress(
final FusionDictionaryBufferInterface buffer, final int headerSize, final int address,
final FormatOptions formatOptions) {
final String cachedString = wordCache.get(address);
if (null != cachedString) return cachedString;

3
java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
View File

@ -207,6 +207,9 @@ public final class FormatSpec {
static final int MAX_TERMINAL_FREQUENCY = 255;
static final int MAX_BIGRAM_FREQUENCY = 15;
// This option needs to be the same numeric value as the one in binary_format.h.
static final int NOT_VALID_WORD = -99;
/**
* Options about file format.
*/

91
tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOTests.java
View File

@ -19,7 +19,7 @@ package com.android.inputmethod.latin.makedict;
import com.android.inputmethod.latin.CollectionUtils;
import com.android.inputmethod.latin.UserHistoryDictIOUtils;
import com.android.inputmethod.latin.makedict.BinaryDictInputOutput.FusionDictionaryBufferInterface;
import com.android.inputmethod.latin.makedict.FormatSpec;
import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
import com.android.inputmethod.latin.makedict.FusionDictionary.CharGroup;
import com.android.inputmethod.latin.makedict.FusionDictionary.Node;
import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
@ -475,4 +475,93 @@ public class BinaryDictIOTests extends AndroidTestCase {
Log.d(TAG, result);
}
}
// Tests for getTerminalPosition
private String getWordFromBinary(final FusionDictionaryBufferInterface buffer,
final int address) {
if (buffer.position() != 0) buffer.position(0);
FileHeader header = null;
try {
header = BinaryDictInputOutput.readHeader(buffer);
} catch (IOException e) {
return null;
} catch (UnsupportedFormatException e) {
return null;
}
if (header == null) return null;
return BinaryDictInputOutput.getWordAtAddress(buffer, header.mHeaderSize,
address - header.mHeaderSize, header.mFormatOptions);
}
private long runGetTerminalPosition(final FusionDictionaryBufferInterface buffer,
final String word, int index, boolean contained) {
final int expectedFrequency = (UNIGRAM_FREQ + index) % 255;
long diff = -1;
int position = -1;
try {
final long now = System.nanoTime();
position = BinaryDictIOUtils.getTerminalPosition(buffer, word);
diff = System.nanoTime() - now;
} catch (IOException e) {
Log.e(TAG, "IOException while getTerminalPosition: " + e);
} catch (UnsupportedFormatException e) {
Log.e(TAG, "UnsupportedFormatException while getTermianlPosition: " + e);
}
assertEquals(FormatSpec.NOT_VALID_WORD != position, contained);
if (contained) assertEquals(getWordFromBinary(buffer, position), word);
return diff;
}
public void testGetTerminalPosition() {
File file = null;
try {
file = File.createTempFile("runReadUnigrams", ".dict");
} catch (IOException e) {
// do nothing
}
assertNotNull(file);
final FusionDictionary dict = new FusionDictionary(new Node(),
new FusionDictionary.DictionaryOptions(
new HashMap<String, String>(), false, false));
addUnigrams(sWords.size(), dict, sWords, null /* shortcutMap */);
timeWritingDictToFile(file, dict, VERSION3_WITH_LINKEDLIST_NODE);
final FusionDictionaryBufferInterface buffer = getBuffer(file, USE_BYTE_ARRAY);
try {
// too long word
final String longWord = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz";
assertEquals(FormatSpec.NOT_VALID_WORD,
BinaryDictIOUtils.getTerminalPosition(buffer, longWord));
// null
assertEquals(FormatSpec.NOT_VALID_WORD,
BinaryDictIOUtils.getTerminalPosition(buffer, null));
// empty string
assertEquals(FormatSpec.NOT_VALID_WORD,
BinaryDictIOUtils.getTerminalPosition(buffer, ""));
} catch (IOException e) {
} catch (UnsupportedFormatException e) {
}
// Test a word that is contained within the dictionary.
long sum = 0;
for (int i = 0; i < sWords.size(); ++i) {
final long time = runGetTerminalPosition(buffer, sWords.get(i), i, true);
sum += time == -1 ? 0 : time;
}
Log.d(TAG, "per a search : " + (((double)sum) / sWords.size() / 1000000));
// Test a word that isn't contained within the dictionary.
final Random random = new Random((int)System.currentTimeMillis());
for (int i = 0; i < 1000; ++i) {
final String word = generateWord(random.nextInt());
if (sWords.indexOf(word) != -1) continue;
runGetTerminalPosition(buffer, word, i, false);
}
}
}