org.wltea.analyzer.core.CharacterUtil Maven / Gradle / Ivy
/*
* IK 中文分词 版本 8.1.1
* IK Analyzer release 8.1.1
*
* 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.
*
* 源代码由林良益([email protected])提供
* 版权声明 2012，乌龙茶工作室
* provided by Linliangyi and copyright 2012 by Oolong studio
*
* 8.1.1版本 由 Magese ([email protected]) 更新
* release 8.1.1 update by Magese([email protected])
*
*/
package org.wltea.analyzer.core;
/**
*
* 字符集识别工具类
*/
class CharacterUtil {
static final int CHAR_USELESS = 0;
static final int CHAR_ARABIC = 0X00000001;
static final int CHAR_ENGLISH = 0X00000002;
static final int CHAR_CHINESE = 0X00000004;
static final int CHAR_OTHER_CJK = 0X00000008;
/**
* 识别字符类型
* @param input 需要识别的字符
* @return int CharacterUtil定义的字符类型常量
*/
static int identifyCharType(char input){
if(input >= '0' && input <= '9'){
return CHAR_ARABIC;
}else if((input >= 'a' && input <= 'z')
|| (input >= 'A' && input <= 'Z')){
return CHAR_ENGLISH;
}else {
Character.UnicodeBlock ub = Character.UnicodeBlock.of(input);
if(ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A){
//目前已知的中文字符UTF-8集合
return CHAR_CHINESE;
}else if(ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS //全角数字字符和日韩字符
//韩文字符集
|| ub == Character.UnicodeBlock.HANGUL_SYLLABLES
|| ub == Character.UnicodeBlock.HANGUL_JAMO
|| ub == Character.UnicodeBlock.HANGUL_COMPATIBILITY_JAMO
//日文字符集
|| ub == Character.UnicodeBlock.HIRAGANA //平假名
|| ub == Character.UnicodeBlock.KATAKANA //片假名
|| ub == Character.UnicodeBlock.KATAKANA_PHONETIC_EXTENSIONS){
return CHAR_OTHER_CJK;
}
}
//其他的不做处理的字符
return CHAR_USELESS;
}
/**
* 进行字符规格化（全角转半角，大写转小写处理）
* @param input 需要转换的字符
* @return char
*/
static char regularize(char input){
if (input == 12288) {
input = (char) 32;
}else if (input > 65280 && input < 65375) {
input = (char) (input - 65248);
}else if (input >= 'A' && input <= 'Z') {
input += 32;
}
return input;
}
}