org.wltea.analyzer.core.CharacterUtil Maven / Gradle / Ivy
package org.wltea.analyzer.core;
/**
* 字符集识别工具类
*/
class CharacterUtil {
public static final int CHAR_USELESS = 0;
public static final int CHAR_ARABIC = 0X00000001;
public static final int CHAR_ENGLISH = 0X00000002;
public static final int CHAR_CHINESE = 0X00000004;
public static final int CHAR_OTHER_CJK = 0X00000008;
/**
* 识别字符类型
*
* @param input
* @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
* @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;
}
}