org.wltea.analyzer.core.LetterSegmenter Maven / Gradle / Ivy
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package org.wltea.analyzer.core;
import java.util.Arrays;
/**
* 英文字符及阿拉伯数字子分词器
*/
class LetterSegmenter implements ISegmenter {
//子分词器标签
static final String SEGMENTER_NAME = "LETTER_SEGMENTER";
//链接符号
private static final char[] Letter_Connector = new char[] { '#', '&', '+', '-', '.', '@', '_' };
//数字符号
private static final char[] Num_Connector = new char[] { ',', '.' };
/*
* 词元的开始位置，
* 同时作为子分词器状态标识
* 当start > -1 时，标识当前的分词器正在处理字符
*/
private int start;
/*
* 记录词元结束位置
* end记录的是在词元中最后一个出现的Letter但非Sign_Connector的字符的位置
*/
private int end;
/*
* 字母起始位置
*/
private int englishStart;
/*
* 字母结束位置
*/
private int englishEnd;
/*
* 阿拉伯数字起始位置
*/
private int arabicStart;
/*
* 阿拉伯数字结束位置
*/
private int arabicEnd;
LetterSegmenter() {
Arrays.sort(Letter_Connector);
Arrays.sort(Num_Connector);
this.start = -1;
this.end = -1;
this.englishStart = -1;
this.englishEnd = -1;
this.arabicStart = -1;
this.arabicEnd = -1;
}
/* (non-Javadoc)
* @see org.wltea.analyzer.core.ISegmenter#analyze(org.wltea.analyzer.core.AnalyzeContext)
*/
public void analyze(AnalyzeContext context) {
boolean bufferLockFlag = false;
//处理英文字母
bufferLockFlag = this.processEnglishLetter(context) || bufferLockFlag;
//处理阿拉伯字母
bufferLockFlag = this.processArabicLetter(context) || bufferLockFlag;
//处理混合字母(这个要放最后处理，可以通过QuickSortSet排除重复)
bufferLockFlag = this.processMixLetter(context) || bufferLockFlag;
//判断是否锁定缓冲区
if (bufferLockFlag) {
context.lockBuffer(SEGMENTER_NAME);
} else {
//对缓冲区解锁
context.unlockBuffer(SEGMENTER_NAME);
}
}
/* (non-Javadoc)
* @see org.wltea.analyzer.core.ISegmenter#reset()
*/
public void reset() {
this.start = -1;
this.end = -1;
this.englishStart = -1;
this.englishEnd = -1;
this.arabicStart = -1;
this.arabicEnd = -1;
}
/**
* 处理数字字母混合输出
* 如：windos2000 | [email protected]
*
* @param context context
* @return return
*/
private boolean processMixLetter(AnalyzeContext context) {
boolean needLock;
if (this.start == -1) {//当前的分词器尚未开始处理字符
if (CharacterUtil.CHAR_ARABIC == context.getCurrentCharType()
|| CharacterUtil.CHAR_ENGLISH == context.getCurrentCharType()) {
//记录起始指针的位置,标明分词器进入处理状态
this.start = context.getCursor();
this.end = start;
}
} else {//当前的分词器正在处理字符
if (CharacterUtil.CHAR_ARABIC == context.getCurrentCharType()
|| CharacterUtil.CHAR_ENGLISH == context.getCurrentCharType()) {
//记录下可能的结束位置
this.end = context.getCursor();
} else if (CharacterUtil.CHAR_USELESS == context.getCurrentCharType()
&& this.isLetterConnector(context.getCurrentChar())) {
//记录下可能的结束位置
this.end = context.getCursor();
} else {
//遇到非Letter字符，输出词元
Lexeme newLexeme = new Lexeme(context.getBufferOffset(), this.start, this.end - this.start + 1, Lexeme.TYPE_LETTER);
context.addLexeme(newLexeme);
this.start = -1;
this.end = -1;
}
}
//判断缓冲区是否已经读完
if (context.isBufferConsumed()) {
if (this.start != -1 && this.end != -1) {
//缓冲以读完，输出词元
Lexeme newLexeme = new Lexeme(context.getBufferOffset(), this.start, this.end - this.start + 1, Lexeme.TYPE_LETTER);
context.addLexeme(newLexeme);
this.start = -1;
this.end = -1;
}
}
//判断是否锁定缓冲区
needLock = !(this.start == -1 && this.end == -1);
return needLock;
}
/**
* 处理纯英文字母输出
*
* @param context context
* @return 结果
*/
private boolean processEnglishLetter(AnalyzeContext context) {
boolean needLock;
if (this.englishStart == -1) {//当前的分词器尚未开始处理英文字符
if (CharacterUtil.CHAR_ENGLISH == context.getCurrentCharType()) {
//记录起始指针的位置,标明分词器进入处理状态
this.englishStart = context.getCursor();
this.englishEnd = this.englishStart;
}
} else {//当前的分词器正在处理英文字符
if (CharacterUtil.CHAR_ENGLISH == context.getCurrentCharType()) {
//记录当前指针位置为结束位置
this.englishEnd = context.getCursor();
} else {
//遇到非English字符,输出词元
Lexeme newLexeme = new Lexeme(context.getBufferOffset(), this.englishStart, this.englishEnd - this.englishStart + 1, Lexeme.TYPE_ENGLISH);
context.addLexeme(newLexeme);
this.englishStart = -1;
this.englishEnd = -1;
}
}
//判断缓冲区是否已经读完
if (context.isBufferConsumed()) {
if (this.englishStart != -1 && this.englishEnd != -1) {
//缓冲以读完，输出词元
Lexeme newLexeme = new Lexeme(context.getBufferOffset(), this.englishStart, this.englishEnd - this.englishStart + 1, Lexeme.TYPE_ENGLISH);
context.addLexeme(newLexeme);
this.englishStart = -1;
this.englishEnd = -1;
}
}
//判断是否锁定缓冲区
needLock = !(this.englishStart == -1 && this.englishEnd == -1);
return needLock;
}
/**
* 处理阿拉伯数字输出
*
* @param context context
* @return 结果
*/
private boolean processArabicLetter(AnalyzeContext context) {
boolean needLock;
if (this.arabicStart == -1) {//当前的分词器尚未开始处理数字字符
if (CharacterUtil.CHAR_ARABIC == context.getCurrentCharType()) {
//记录起始指针的位置,标明分词器进入处理状态
this.arabicStart = context.getCursor();
this.arabicEnd = this.arabicStart;
}
} else {//当前的分词器正在处理数字字符
if (CharacterUtil.CHAR_ARABIC == context.getCurrentCharType()) {
//记录当前指针位置为结束位置
this.arabicEnd = context.getCursor();
} else if (CharacterUtil.CHAR_USELESS == context.getCurrentCharType()
&& this.isNumConnector(context.getCurrentChar())) {
//不输出数字，但不标记结束
} else {
////遇到非Arabic字符,输出词元
Lexeme newLexeme = new Lexeme(context.getBufferOffset(), this.arabicStart, this.arabicEnd - this.arabicStart + 1, Lexeme.TYPE_ARABIC);
context.addLexeme(newLexeme);
this.arabicStart = -1;
this.arabicEnd = -1;
}
}
//判断缓冲区是否已经读完
if (context.isBufferConsumed()) {
if (this.arabicStart != -1 && this.arabicEnd != -1) {
//生成已切分的词元
Lexeme newLexeme = new Lexeme(context.getBufferOffset(), this.arabicStart, this.arabicEnd - this.arabicStart + 1, Lexeme.TYPE_ARABIC);
context.addLexeme(newLexeme);
this.arabicStart = -1;
this.arabicEnd = -1;
}
}
//判断是否锁定缓冲区
needLock = !(this.arabicStart == -1 && this.arabicEnd == -1);
return needLock;
}
/**
* 判断是否是字母连接符号
*
* @param input input
* @return 结果
*/
private boolean isLetterConnector(char input) {
int index = Arrays.binarySearch(Letter_Connector, input);
return index >= 0;
}
/**
* 判断是否是数字连接符号
*
* @param input input
* @return 结果
*/
private boolean isNumConnector(char input) {
int index = Arrays.binarySearch(Num_Connector, input);
return index >= 0;
}
}