/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.lucene.analysis.cn.smart.hhmm;
import java.io.UnsupportedEncodingException;
/**
* <p>
* SmartChineseAnalyzer abstract dictionary implementation.
* </p>
* <p>
* Contains methods for dealing with GB2312 encoding.
* </p>
* @lucene.experimental
*/
abstract class AbstractDictionary {
/**
* First Chinese Character in GB2312 (15 * 94)
* Characters in GB2312 are arranged in a grid of 94 * 94, 0-14 are unassigned or punctuation.
*/
public static final int GB2312_FIRST_CHAR = 1410;
/**
* Last Chinese Character in GB2312 (87 * 94).
* Characters in GB2312 are arranged in a grid of 94 * 94, 88-94 are unassigned.
*/
public static final int GB2312_CHAR_NUM = 87 * 94;
/**
* Dictionary data contains 6768 Chinese characters with frequency statistics.
*/
public static final int CHAR_NUM_IN_FILE = 6768;
// =====================================================
// code +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
// B0A0 啊 阿 埃 挨 哎 唉 哀 皑 癌 蔼 矮 艾 碍 爱 隘
// B0B0 鞍 氨 安 俺 按 暗 岸 胺 案 肮 昂 盎 凹 敖 熬 翱
// B0C0 袄 傲 奥 懊 澳 芭 捌 扒 叭 吧 笆 八 疤 巴 拔 跋
// B0D0 靶 把 耙 坝 霸 罢 爸 白 柏 百 摆 佰 败 拜 稗 斑
// B0E0 班 搬 扳 般 颁 板 版 扮 拌 伴 瓣 半 办 绊 邦 帮
// B0F0 梆 榜 膀 绑 棒 磅 蚌 镑 傍 谤 苞 胞 包 褒 剥
// =====================================================
//
// GB2312 character set：
// 01 94 Symbols
// 02 72 Numbers
// 03 94 Latin
// 04 83 Kana
// 05 86 Katakana
// 06 48 Greek
// 07 66 Cyrillic
// 08 63 Phonetic Symbols
// 09 76 Drawing Symbols
// 10-15 Unassigned
// 16-55 3755 Plane 1, in pinyin order
// 56-87 3008 Plane 2, in radical/stroke order
// 88-94 Unassigned
// ======================================================
/**
* <p>
* Transcode from GB2312 ID to Unicode
* </p>
* <p>
* GB2312 is divided into a 94 * 94 grid, containing 7445 characters consisting of 6763 Chinese characters and 682 symbols.
* Some regions are unassigned (reserved).
* </p>
*
* @param ccid GB2312 id
* @return unicode String
*/
public String getCCByGB2312Id(int ccid) {
if (ccid < 0 || ccid > WordDictionary.GB2312_CHAR_NUM)
return "";
int cc1 = ccid / 94 + 161;
int cc2 = ccid % 94 + 161;
byte[] buffer = new byte[2];
buffer[0] = (byte) cc1;
buffer[1] = (byte) cc2;
try {
String cchar = new String(buffer, "GB2312");
return cchar;
} catch (UnsupportedEncodingException e) {
return "";
}
}
/**
* Transcode from Unicode to GB2312
*
* @param ch input character in Unicode, or character in Basic Latin range.
* @return position in GB2312
*/
public short getGB2312Id(char ch) {
try {
byte[] buffer = Character.toString(ch).getBytes("GB2312");
if (buffer.length != 2) {
// Should be a two-byte character
return -1;
}
int b0 = (int) (buffer[0] & 0x0FF) - 161; // Code starts from A1, therefore subtract 0xA1=161
int b1 = (int) (buffer[1] & 0x0FF) - 161; // There is no Chinese char for the first and last symbol.
// Therefore, each code page only has 16*6-2=94 characters.
return (short) (b0 * 94 + b1);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return -1;
}
/**
* 32-bit FNV Hash Function
*
* @param c input character
* @return hashcode
*/
public long hash1(char c) {
final long p = 1099511628211L;
long hash = 0xcbf29ce484222325L;
hash = (hash ^ (c & 0x00FF)) * p;
hash = (hash ^ (c >> 8)) * p;
hash += hash << 13;
hash ^= hash >> 7;
hash += hash << 3;
hash ^= hash >> 17;
hash += hash << 5;
return hash;
}
/**
* 32-bit FNV Hash Function
*
* @param carray character array
* @return hashcode
*/
public long hash1(char carray[]) {
final long p = 1099511628211L;
long hash = 0xcbf29ce484222325L;
for (int i = 0; i < carray.length; i++) {
char d = carray[i];
hash = (hash ^ (d & 0x00FF)) * p;
hash = (hash ^ (d >> 8)) * p;
}
// hash += hash << 13;
// hash ^= hash >> 7;
// hash += hash << 3;
// hash ^= hash >> 17;
// hash += hash << 5;
return hash;
}
/**
* djb2 hash algorithm，this algorithm (k=33) was first reported by dan
* bernstein many years ago in comp.lang.c. another version of this algorithm
* (now favored by bernstein) uses xor: hash(i) = hash(i - 1) * 33 ^ str[i];
* the magic of number 33 (why it works better than many other constants,
* prime or not) has never been adequately explained.
*
* @param c character
* @return hashcode
*/
public int hash2(char c) {
int hash = 5381;
/* hash 33 + c */
hash = ((hash << 5) + hash) + c & 0x00FF;
hash = ((hash << 5) + hash) + c >> 8;
return hash;
}
/**
* djb2 hash algorithm，this algorithm (k=33) was first reported by dan
* bernstein many years ago in comp.lang.c. another version of this algorithm
* (now favored by bernstein) uses xor: hash(i) = hash(i - 1) * 33 ^ str[i];
* the magic of number 33 (why it works better than many other constants,
* prime or not) has never been adequately explained.
*
* @param carray character array
* @return hashcode
*/
public int hash2(char carray[]) {
int hash = 5381;
/* hash 33 + c */
for (int i = 0; i < carray.length; i++) {
char d = carray[i];
hash = ((hash << 5) + hash) + d & 0x00FF;
hash = ((hash << 5) + hash) + d >> 8;
}
return hash;
}
}