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/*
* 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.FormatSpec.FileHeader;
import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.TreeMap;
/**
* A base class of the binary dictionary decoder.
*/
public abstract class AbstractDictDecoder implements DictDecoder {
protected FileHeader readHeader(final DictBuffer dictBuffer)
throws IOException, UnsupportedFormatException {
if (dictBuffer == null) {
openDictBuffer();
}
final int version = HeaderReader.readVersion(dictBuffer);
if (version < FormatSpec.MINIMUM_SUPPORTED_VERSION
|| version > FormatSpec.MAXIMUM_SUPPORTED_VERSION) {
throw new UnsupportedFormatException("Unsupported version : " + version);
}
// TODO: Remove this field.
final int optionsFlags = HeaderReader.readOptionFlags(dictBuffer);
final int headerSize = HeaderReader.readHeaderSize(dictBuffer);
if (headerSize < 0) {
throw new UnsupportedFormatException("header size can't be negative.");
}
final HashMap<String, String> attributes = HeaderReader.readAttributes(dictBuffer,
headerSize);
final FileHeader header = new FileHeader(headerSize,
new FusionDictionary.DictionaryOptions(attributes,
0 != (optionsFlags & FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG),
0 != (optionsFlags & FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG)),
new FormatOptions(version,
0 != (optionsFlags & FormatSpec.SUPPORTS_DYNAMIC_UPDATE)));
return header;
}
@Override @UsedForTesting
public int getTerminalPosition(final String word)
throws IOException, UnsupportedFormatException {
if (!isDictBufferOpen()) {
openDictBuffer();
}
return BinaryDictIOUtils.getTerminalPosition(this, word);
}
@Override @UsedForTesting
public void readUnigramsAndBigramsBinary(final TreeMap<Integer, String> words,
final TreeMap<Integer, Integer> frequencies,
final TreeMap<Integer, ArrayList<PendingAttribute>> bigrams)
throws IOException, UnsupportedFormatException {
if (!isDictBufferOpen()) {
openDictBuffer();
}
BinaryDictIOUtils.readUnigramsAndBigramsBinary(this, words, frequencies, bigrams);
}
/**
* A utility class for reading a file header.
*/
protected static class HeaderReader {
protected static int readVersion(final DictBuffer dictBuffer)
throws IOException, UnsupportedFormatException {
return BinaryDictDecoderUtils.checkFormatVersion(dictBuffer);
}
protected static int readOptionFlags(final DictBuffer dictBuffer) {
return dictBuffer.readUnsignedShort();
}
protected static int readHeaderSize(final DictBuffer dictBuffer) {
return dictBuffer.readInt();
}
protected static HashMap<String, String> readAttributes(final DictBuffer dictBuffer,
final int headerSize) {
final HashMap<String, String> attributes = new HashMap<String, String>();
while (dictBuffer.position() < headerSize) {
// We can avoid an infinite loop here since dictBuffer.position() is always
// increased by calling CharEncoding.readString.
final String key = CharEncoding.readString(dictBuffer);
final String value = CharEncoding.readString(dictBuffer);
attributes.put(key, value);
}
dictBuffer.position(headerSize);
return attributes;
}
}
/**
* A utility class for reading a PtNode.
*/
protected static class PtNodeReader {
protected static int readPtNodeOptionFlags(final DictBuffer dictBuffer) {
return dictBuffer.readUnsignedByte();
}
protected static int readParentAddress(final DictBuffer dictBuffer,
final FormatOptions formatOptions) {
if (BinaryDictIOUtils.supportsDynamicUpdate(formatOptions)) {
return BinaryDictDecoderUtils.readSInt24(dictBuffer);
} else {
return FormatSpec.NO_PARENT_ADDRESS;
}
}
protected static int readChildrenAddress(final DictBuffer dictBuffer, final int optionFlags,
final FormatOptions formatOptions) {
if (BinaryDictIOUtils.supportsDynamicUpdate(formatOptions)) {
final int address = BinaryDictDecoderUtils.readSInt24(dictBuffer);
if (address == 0) return FormatSpec.NO_CHILDREN_ADDRESS;
return address;
} else {
switch (optionFlags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) {
case FormatSpec.FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE:
return dictBuffer.readUnsignedByte();
case FormatSpec.FLAG_CHILDREN_ADDRESS_TYPE_TWOBYTES:
return dictBuffer.readUnsignedShort();
case FormatSpec.FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES:
return dictBuffer.readUnsignedInt24();
case FormatSpec.FLAG_CHILDREN_ADDRESS_TYPE_NOADDRESS:
default:
return FormatSpec.NO_CHILDREN_ADDRESS;
}
}
}
// Reads shortcuts and returns the read length.
protected static int readShortcut(final DictBuffer dictBuffer,
final ArrayList<WeightedString> shortcutTargets) {
final int pointerBefore = dictBuffer.position();
dictBuffer.readUnsignedShort(); // skip the size
while (true) {
final int targetFlags = dictBuffer.readUnsignedByte();
final String word = CharEncoding.readString(dictBuffer);
shortcutTargets.add(new WeightedString(word,
targetFlags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_FREQUENCY));
if (0 == (targetFlags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_HAS_NEXT)) break;
}
return dictBuffer.position() - pointerBefore;
}
protected static int readBigramAddresses(final DictBuffer dictBuffer,
final ArrayList<PendingAttribute> bigrams, final int baseAddress) {
int readLength = 0;
int bigramCount = 0;
while (bigramCount++ < FormatSpec.MAX_BIGRAMS_IN_A_PTNODE) {
final int bigramFlags = dictBuffer.readUnsignedByte();
++readLength;
final int sign = 0 == (bigramFlags & FormatSpec.FLAG_BIGRAM_ATTR_OFFSET_NEGATIVE)
? 1 : -1;
int bigramAddress = baseAddress + readLength;
switch (bigramFlags & FormatSpec.MASK_BIGRAM_ATTR_ADDRESS_TYPE) {
case FormatSpec.FLAG_BIGRAM_ATTR_ADDRESS_TYPE_ONEBYTE:
bigramAddress += sign * dictBuffer.readUnsignedByte();
readLength += 1;
break;
case FormatSpec.FLAG_BIGRAM_ATTR_ADDRESS_TYPE_TWOBYTES:
bigramAddress += sign * dictBuffer.readUnsignedShort();
readLength += 2;
break;
case FormatSpec.FLAG_BIGRAM_ATTR_ADDRESS_TYPE_THREEBYTES:
bigramAddress += sign * dictBuffer.readUnsignedInt24();
readLength += 3;
break;
default:
throw new RuntimeException("Has bigrams with no address");
}
bigrams.add(new PendingAttribute(
bigramFlags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_FREQUENCY,
bigramAddress));
if (0 == (bigramFlags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_HAS_NEXT)) break;
}
return readLength;
}
}
}
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