1 // © 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html#License 3 /* 4 ******************************************************************************* 5 * Copyright (C) 2012-2016, International Business Machines Corporation and 6 * others. All Rights Reserved. 7 ******************************************************************************* 8 */ 9 10 package com.ibm.icu.text; 11 12 import java.io.IOException; 13 import java.nio.ByteBuffer; 14 15 import com.ibm.icu.impl.Assert; 16 import com.ibm.icu.impl.ICUBinary; 17 import com.ibm.icu.impl.ICUData; 18 import com.ibm.icu.impl.ICUResourceBundle; 19 import com.ibm.icu.util.UResourceBundle; 20 21 final class DictionaryData { 22 // disallow instantiation DictionaryData()23 private DictionaryData() { } 24 25 public static final int TRIE_TYPE_BYTES = 0; 26 public static final int TRIE_TYPE_UCHARS = 1; 27 public static final int TRIE_TYPE_MASK = 7; 28 public static final int TRIE_HAS_VALUES = 8; 29 public static final int TRANSFORM_NONE = 0; 30 public static final int TRANSFORM_TYPE_OFFSET = 0x1000000; 31 public static final int TRANSFORM_TYPE_MASK = 0x7f000000; 32 public static final int TRANSFORM_OFFSET_MASK = 0x1fffff; 33 34 public static final int IX_STRING_TRIE_OFFSET = 0; 35 public static final int IX_RESERVED1_OFFSET = 1; 36 public static final int IX_RESERVED2_OFFSET = 2; 37 public static final int IX_TOTAL_SIZE = 3; 38 public static final int IX_TRIE_TYPE = 4; 39 public static final int IX_TRANSFORM = 5; 40 public static final int IX_RESERVED6 = 6; 41 public static final int IX_RESERVED7 = 7; 42 public static final int IX_COUNT = 8; 43 44 private static final int DATA_FORMAT_ID = 0x44696374; 45 loadDictionaryFor(String dictType)46 public static DictionaryMatcher loadDictionaryFor(String dictType) throws IOException { 47 ICUResourceBundle rb = (ICUResourceBundle)UResourceBundle.getBundleInstance(ICUData.ICU_BRKITR_BASE_NAME); 48 String dictFileName = rb.getStringWithFallback("dictionaries/" + dictType); 49 dictFileName = ICUData.ICU_BRKITR_NAME + '/' + dictFileName; 50 ByteBuffer bytes = ICUBinary.getRequiredData(dictFileName); 51 ICUBinary.readHeader(bytes, DATA_FORMAT_ID, null); 52 int[] indexes = new int[IX_COUNT]; 53 // TODO: read indexes[IX_STRING_TRIE_OFFSET] first, then read a variable-length indexes[] 54 for (int i = 0; i < IX_COUNT; i++) { 55 indexes[i] = bytes.getInt(); 56 } 57 int offset = indexes[IX_STRING_TRIE_OFFSET]; 58 Assert.assrt(offset >= (4 * IX_COUNT)); 59 if (offset > (4 * IX_COUNT)) { 60 int diff = offset - (4 * IX_COUNT); 61 ICUBinary.skipBytes(bytes, diff); 62 } 63 int trieType = indexes[IX_TRIE_TYPE] & TRIE_TYPE_MASK; 64 int totalSize = indexes[IX_TOTAL_SIZE] - offset; 65 DictionaryMatcher m = null; 66 if (trieType == TRIE_TYPE_BYTES) { 67 int transform = indexes[IX_TRANSFORM]; 68 byte[] data = new byte[totalSize]; 69 bytes.get(data); 70 m = new BytesDictionaryMatcher(data, transform); 71 } else if (trieType == TRIE_TYPE_UCHARS) { 72 Assert.assrt(totalSize % 2 == 0); 73 String data = ICUBinary.getString(bytes, totalSize / 2, totalSize & 1); 74 m = new CharsDictionaryMatcher(data); 75 } else { 76 m = null; 77 } 78 return m; 79 } 80 } 81