/*
*******************************************************************************
* Copyright (C) 2012, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
package com.ibm.icu.text;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import com.ibm.icu.impl.Assert;
import com.ibm.icu.impl.ICUBinary;
import com.ibm.icu.impl.ICUData;
import com.ibm.icu.impl.ICUResourceBundle;
import com.ibm.icu.util.UResourceBundle;
final class DictionaryData {
// disallow instantiation
private DictionaryData() {
}
public static final int TRIE_TYPE_BYTES = 0;
public static final int TRIE_TYPE_UCHARS = 1;
public static final int TRIE_TYPE_MASK = 7;
public static final int TRIE_HAS_VALUES = 8;
public static final int TRANSFORM_NONE = 0;
public static final int TRANSFORM_TYPE_OFFSET = 0x1000000;
public static final int TRANSFORM_TYPE_MASK = 0x7f000000;
public static final int TRANSFORM_OFFSET_MASK = 0x1fffff;
public static final int IX_STRING_TRIE_OFFSET = 0;
public static final int IX_RESERVED1_OFFSET = 1;
public static final int IX_RESERVED2_OFFSET = 2;
public static final int IX_TOTAL_SIZE = 3;
public static final int IX_TRIE_TYPE = 4;
public static final int IX_TRANSFORM = 5;
public static final int IX_RESERVED6 = 6;
public static final int IX_RESERVED7 = 7;
public static final int IX_COUNT = 8;
private static final byte DATA_FORMAT_ID[] = { (byte) 0x44, (byte) 0x69, (byte) 0x63, (byte) 0x74 };
public static DictionaryMatcher loadDictionaryFor(String dictType) throws IOException {
ICUResourceBundle rb = (ICUResourceBundle) UResourceBundle.getBundleInstance(ICUResourceBundle.ICU_BRKITR_BASE_NAME);
String dictFileName = rb.getStringWithFallback("dictionaries/" + dictType);
dictFileName = ICUResourceBundle.ICU_BUNDLE + ICUResourceBundle.ICU_BRKITR_NAME + "/" + dictFileName;
InputStream is = ICUData.getStream(dictFileName);
ICUBinary.readHeader(is, DATA_FORMAT_ID, null);
DataInputStream s = new DataInputStream(is);
int[] indexes = new int[IX_COUNT];
// TODO: read indexes[IX_STRING_TRIE_OFFSET] first, then read a variable-length indexes[]
for (int i = 0; i < IX_COUNT; i++) {
indexes[i] = s.readInt();
}
int offset = indexes[IX_STRING_TRIE_OFFSET];
Assert.assrt(offset >= (4 * IX_COUNT));
if (offset > (4 * IX_COUNT)) {
int diff = offset - (4 * IX_COUNT);
s.skipBytes(diff);
}
int trieType = indexes[IX_TRIE_TYPE] & TRIE_TYPE_MASK;
int totalSize = indexes[IX_TOTAL_SIZE] - offset;
DictionaryMatcher m = null;
if (trieType == TRIE_TYPE_BYTES) {
int transform = indexes[IX_TRANSFORM];
byte[] data = new byte[totalSize];
int i;
for (i = 0; i < data.length; i++) {
data[i] = s.readByte();
}
Assert.assrt(i == totalSize);
m = new BytesDictionaryMatcher(data, transform);
} else if (trieType == TRIE_TYPE_UCHARS) {
Assert.assrt(totalSize % 2 == 0);
int num = totalSize / 2;
char[] data = new char[totalSize / 2];
for (int i = 0; i < num; i++) {
data[i] = s.readChar();
}
m = new CharsDictionaryMatcher(new String(data));
} else {
m = null;
}
s.close();
is.close();
return m;
}
}