src/com/hughes/android/dictionary/engine/Dictionary.java

   1 // Copyright 2011 Google Inc. All Rights Reserved.
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 package com.hughes.android.dictionary.engine;
  16
  17 import com.hughes.android.dictionary.DictionaryInfo;
  18 import com.hughes.util.CachingList;
  19 import com.hughes.util.StringUtil;
  20 import com.hughes.util.raf.RAFList;
  21 import com.hughes.util.raf.RAFListSerializer;
  22 import com.hughes.util.raf.RAFSerializable;
  23
  24 import java.io.DataInput;
  25 import java.io.DataInputStream;
  26 import java.io.DataOutput;
  27 import java.io.File;
  28 import java.io.IOException;
  29 import java.io.PrintStream;
  30 import java.io.RandomAccessFile;
  31 import java.nio.channels.Channels;
  32 import java.nio.channels.FileChannel;
  33 import java.util.ArrayList;
  34 import java.util.Collections;
  35 import java.util.List;
  36
  37 public class Dictionary implements RAFSerializable<Dictionary> {
  38
  39     static final int CACHE_SIZE = 5000;
  40
  41     static final int CURRENT_DICT_VERSION = 7;
  42     static final String END_OF_DICTIONARY = "END OF DICTIONARY";
  43
  44     // persisted
  45     final int dictFileVersion;
  46     final long creationMillis;
  47     public final String dictInfo;
  48     public final List<PairEntry> pairEntries;
  49     public final List<TextEntry> textEntries;
  50     public final List<HtmlEntry> htmlEntries;
  51     public final List<byte[]> htmlData;
  52     public final List<EntrySource> sources;
  53     public final List<Index> indices;
  54
  55     /**
  56      * dictFileVersion 1 adds: <li>links to sources? dictFileVersion 2 adds: <li>
  57      * counts of tokens in indices.
  58      */
  59
  60     public Dictionary(final String dictInfo) {
  61         this.dictFileVersion = CURRENT_DICT_VERSION;
  62         this.creationMillis = System.currentTimeMillis();
  63         this.dictInfo = dictInfo;
  64         pairEntries = new ArrayList<PairEntry>();
  65         textEntries = new ArrayList<TextEntry>();
  66         htmlEntries = new ArrayList<HtmlEntry>();
  67         htmlData = null;
  68         sources = new ArrayList<EntrySource>();
  69         indices = new ArrayList<Index>();
  70     }
  71
  72     public Dictionary(final FileChannel ch) throws IOException {
  73         DataInput raf = new DataInputStream(Channels.newInputStream(ch));
  74         dictFileVersion = raf.readInt();
  75         if (dictFileVersion < 0 || dictFileVersion > CURRENT_DICT_VERSION) {
  76             throw new IOException("Invalid dictionary version: " + dictFileVersion);
  77         }
  78         creationMillis = raf.readLong();
  79         dictInfo = raf.readUTF();
  80
  81         // Load the sources, then seek past them, because reading them later
  82         // disrupts the offset.
  83         try {
  84             final RAFList<EntrySource> rafSources = RAFList.create(ch, new EntrySource.Serializer(
  85                     this), ch.position(), dictFileVersion, dictInfo + " sources: ");
  86             sources = new ArrayList<EntrySource>(rafSources);
  87             ch.position(rafSources.getEndOffset());
  88
  89             pairEntries = CachingList.create(
  90                               RAFList.create(ch, new PairEntry.Serializer(this), ch.position(), dictFileVersion, dictInfo + " pairs: "),
  91                               CACHE_SIZE, false);
  92             textEntries = CachingList.create(
  93                               RAFList.create(ch, new TextEntry.Serializer(this), ch.position(), dictFileVersion, dictInfo + " text: "),
  94                               CACHE_SIZE, true);
  95             if (dictFileVersion >= 5) {
  96                 htmlEntries = CachingList.create(
  97                                   RAFList.create(ch, new HtmlEntry.Serializer(this, ch), ch.position(), dictFileVersion, dictInfo + " html: "),
  98                                   CACHE_SIZE, false);
  99             } else {
 100                 htmlEntries = Collections.emptyList();
 101             }
 102             if (dictFileVersion >= 7) {
 103                 htmlData = RAFList.create(ch, new HtmlEntry.DataDeserializer(), ch.position(), dictFileVersion, dictInfo + " html: ");
 104             } else {
 105                 htmlData = null;
 106             }
 107             indices = CachingList.createFullyCached(RAFList.create(ch, new IndexSerializer(ch),
 108                                                     ch.position(), dictFileVersion, dictInfo + " index: "));
 109         } catch (RuntimeException e) {
 110             final IOException ioe = new IOException("RuntimeException loading dictionary", e);
 111             throw ioe;
 112         }
 113         final String end = raf.readUTF();
 114         if (!end.equals(END_OF_DICTIONARY)) {
 115             throw new IOException("Dictionary seems corrupt: " + end);
 116         }
 117     }
 118
 119     @Override
 120     public void write(DataOutput out) throws IOException {
 121         RandomAccessFile raf = (RandomAccessFile)out;
 122         raf.writeInt(dictFileVersion);
 123         raf.writeLong(creationMillis);
 124         raf.writeUTF(dictInfo);
 125         System.out.println("sources start: " + raf.getFilePointer());
 126         RAFList.write(raf, sources, new EntrySource.Serializer(this));
 127         System.out.println("pair start: " + raf.getFilePointer());
 128         RAFList.write(raf, pairEntries, new PairEntry.Serializer(this), 64, true);
 129         System.out.println("text start: " + raf.getFilePointer());
 130         RAFList.write(raf, textEntries, new TextEntry.Serializer(this));
 131         System.out.println("html index start: " + raf.getFilePointer());
 132         RAFList.write(raf, htmlEntries, new HtmlEntry.Serializer(this, null), 64, true);
 133         System.out.println("html data start: " + raf.getFilePointer());
 134         assert htmlData == null;
 135         RAFList.write(raf, htmlEntries, new HtmlEntry.DataSerializer(), 128, true);
 136         System.out.println("indices start: " + raf.getFilePointer());
 137         RAFList.write(raf, indices, new IndexSerializer(null));
 138         System.out.println("end: " + raf.getFilePointer());
 139         raf.writeUTF(END_OF_DICTIONARY);
 140     }
 141
 142     private final class IndexSerializer implements RAFListSerializer<Index> {
 143         private final FileChannel ch;
 144
 145         public IndexSerializer(FileChannel ch) {
 146             this.ch = ch;
 147         }
 148
 149         @Override
 150         public Index read(DataInput raf, final int readIndex) throws IOException {
 151             return new Index(Dictionary.this, ch, raf);
 152         }
 153
 154         @Override
 155         public void write(DataOutput raf, Index t) throws IOException {
 156             t.write(raf);
 157         }
 158     }
 159
 160     final RAFListSerializer<HtmlEntry> htmlEntryIndexSerializer = new RAFListSerializer<HtmlEntry>() {
 161         @Override
 162         public void write(DataOutput raf, HtmlEntry t) {
 163             assert false;
 164         }
 165
 166         @Override
 167         public HtmlEntry read(DataInput raf, int readIndex) throws IOException {
 168             return htmlEntries.get(raf.readInt());
 169         }
 170     };
 171
 172     public void print(final PrintStream out) {
 173         out.println("dictInfo=" + dictInfo);
 174         for (final EntrySource entrySource : sources) {
 175             out.printf("EntrySource: %s %d\n", entrySource.name, entrySource.numEntries);
 176         }
 177         out.println();
 178         for (final Index index : indices) {
 179             out.printf("Index: %s %s\n", index.shortName, index.longName);
 180             index.print(out);
 181             out.println();
 182         }
 183     }
 184
 185     public DictionaryInfo getDictionaryInfo() {
 186         final DictionaryInfo result = new DictionaryInfo();
 187         result.creationMillis = this.creationMillis;
 188         result.dictInfo = this.dictInfo;
 189         for (final Index index : indices) {
 190             result.indexInfos.add(index.getIndexInfo());
 191         }
 192         return result;
 193     }
 194
 195     public static DictionaryInfo getDictionaryInfo(final File file) {
 196         RandomAccessFile raf = null;
 197         try {
 198             raf = new RandomAccessFile(file, "r");
 199             final Dictionary dict = new Dictionary(raf.getChannel());
 200             final DictionaryInfo dictionaryInfo = dict.getDictionaryInfo();
 201             dictionaryInfo.uncompressedFilename = file.getName();
 202             dictionaryInfo.uncompressedBytes = file.length();
 203             raf.close();
 204             return dictionaryInfo;
 205         } catch (IOException e) {
 206             final DictionaryInfo dictionaryInfo = new DictionaryInfo();
 207             dictionaryInfo.uncompressedFilename = file.getName();
 208             dictionaryInfo.uncompressedBytes = file.length();
 209             return dictionaryInfo;
 210         } finally {
 211             if (raf != null) {
 212                 try {
 213                     raf.close();
 214                 } catch (IOException e) {
 215                     e.printStackTrace();
 216                 }
 217             }
 218         }
 219     }
 220
 221 }