| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * 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.intellij.spellchecker.compress; |
| |
| import com.intellij.openapi.diagnostic.Logger; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| public final class Encoder { |
| |
| private final Alphabet alphabet; |
| private static final int offset = 0; |
| static final UnitBitSet WORD_OF_ENTIRELY_UNKNOWN_LETTERS = new UnitBitSet(new byte[1],new Alphabet()); |
| private static final Logger LOG = Logger.getInstance("#com.intellij.spellchecker.compress"); |
| |
| public Encoder() { |
| alphabet = new Alphabet(); |
| } |
| |
| public Encoder(Alphabet alphabet) { |
| this.alphabet = alphabet; |
| } |
| |
| public Alphabet getAlphabet() { |
| return alphabet; |
| } |
| |
| @Nullable |
| public UnitBitSet encode(@NotNull CharSequence letters, boolean force) { |
| if (UnitBitSet.MAX_CHARS_IN_WORD <= letters.length() + offset) return null; |
| int unknownLetters = 0; |
| byte[] indices = new byte[letters.length()]; |
| for (int i = 0; i < letters.length(); i++) { |
| char letter = letters.charAt(i); |
| int index = alphabet.getIndex(letter, force); |
| if (index < 0) { |
| unknownLetters++; |
| } |
| else { |
| indices[i] = (byte)index; |
| } |
| } |
| if (unknownLetters == letters.length()) return WORD_OF_ENTIRELY_UNKNOWN_LETTERS; |
| if (unknownLetters>0) return null; |
| return new UnitBitSet(indices, alphabet); |
| } |
| |
| @NotNull |
| public String decode(@NotNull byte[] compressed) { |
| return UnitBitSet.decode(compressed, alphabet); |
| } |
| |
| public int getFirstLetterIndex(byte firstPackedByte) { |
| return UnitBitSet.getFirstLetterIndex(firstPackedByte, alphabet); |
| } |
| } |