首页>代码>springboot2.0+lucene简单demo,实现高亮,全文索引。>/lucene-master/src/main/java/com/xywy/lucene/core/AnalyzeContext.java
/** * IK 中文分词 版本 5.0 * IK Analyzer release 5.0 * * 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(linliangyi2005@gmail.com)提供 * 版权声明 2012,乌龙茶工作室 * provided by Linliangyi and copyright 2012 by Oolong studio * */ package com.xywy.lucene.core; import com.xywy.lucene.cfg.Configuration; import java.io.IOException; import java.io.Reader; import com.xywy.lucene.dic.Dictionary; import java.util.*; /** * * 分词器上下文状态 * */ class AnalyzeContext { // 默认缓冲区大小 private static final int BUFF_SIZE = 4096; // 缓冲区耗尽的临界值 private static final int BUFF_EXHAUST_CRITICAL = 100; // 字符窜读取缓冲 private char[] segmentBuff; // 字符类型数组 private int[] charTypes; // 记录Reader内已分析的字串总长度 // 在分多段分析词元时,该变量累计当前的segmentBuff相对于reader起始位置的位移 private int buffOffset; // 当前缓冲区位置指针 private int cursor; // 最近一次读入的,可处理的字串长度 private int available; // 子分词器锁 // 该集合非空,说明有子分词器在占用segmentBuff private Set<String> buffLocker; // 原始分词结果集合,未经歧义处理 private QuickSortSet orgLexemes; // LexemePath位置索引表 private Map<Integer, LexemePath> pathMap; // 最终分词结果集 private LinkedList<Lexeme> results; // 分词器配置项 private Configuration cfg; public AnalyzeContext(Configuration cfg) { this.cfg = cfg; this.segmentBuff = new char[BUFF_SIZE]; this.charTypes = new int[BUFF_SIZE]; this.buffLocker = new HashSet<String>(); this.orgLexemes = new QuickSortSet(); this.pathMap = new HashMap<Integer, LexemePath>(); this.results = new LinkedList<Lexeme>(); } int getCursor() { return this.cursor; } // // void setCursor(int cursor){ // this.cursor = cursor; // } char[] getSegmentBuff() { return this.segmentBuff; } char getCurrentChar() { return this.segmentBuff[this.cursor]; } int getCurrentCharType() { return this.charTypes[this.cursor]; } int getBufferOffset() { return this.buffOffset; } /** * 根据context的上下文情况,填充segmentBuff * @param reader * @return 返回待分析的(有效的)字串长度 * @throws IOException */ int fillBuffer(Reader reader) throws IOException { int readCount = 0; if (this.buffOffset == 0) { // 首次读取reader readCount = reader.read(segmentBuff); } else { int offset = this.available - this.cursor; if (offset > 0) { // 最近一次读取的>最近一次处理的,将未处理的字串拷贝到segmentBuff头部 System.arraycopy(this.segmentBuff, this.cursor, this.segmentBuff, 0, offset); readCount = offset; } // 继续读取reader ,以onceReadIn - onceAnalyzed为起始位置,继续填充segmentBuff剩余的部分 readCount += reader.read(this.segmentBuff, offset, BUFF_SIZE - offset); } // 记录最后一次从Reader中读入的可用字符长度 this.available = readCount; // 重置当前指针 this.cursor = 0; return readCount; } /** * 初始化buff指针,处理第一个字符 */ void initCursor() { this.cursor = 0; this.segmentBuff[this.cursor] = CharacterUtil.regularize(this.segmentBuff[this.cursor]); this.charTypes[this.cursor] = CharacterUtil.identifyCharType(this.segmentBuff[this.cursor]); } /** * 指针+1 * 成功返回 true; 指针已经到了buff尾部,不能前进,返回false * 并处理当前字符 */ boolean moveCursor() { if (this.cursor < this.available - 1) { this.cursor++; this.segmentBuff[this.cursor] = CharacterUtil.regularize(this.segmentBuff[this.cursor]); this.charTypes[this.cursor] = CharacterUtil.identifyCharType(this.segmentBuff[this.cursor]); return true; } else { return false; } } /** * 设置当前segmentBuff为锁定状态 * 加入占用segmentBuff的子分词器名称,表示占用segmentBuff * @param segmenterName */ void lockBuffer(String segmenterName) { this.buffLocker.add(segmenterName); } /** * 移除指定的子分词器名,释放对segmentBuff的占用 * @param segmenterName */ void unlockBuffer(String segmenterName) { this.buffLocker.remove(segmenterName); } /** * 只要buffLocker中存在segmenterName * 则buffer被锁定 * @return boolean 缓冲去是否被锁定 */ boolean isBufferLocked() { return this.buffLocker.size() > 0; } /** * 判断当前segmentBuff是否已经用完 * 当前执针cursor移至segmentBuff末端this.available - 1 * @return */ boolean isBufferConsumed() { return this.cursor == this.available - 1; } /** * 判断segmentBuff是否需要读取新数据 * * 满足一下条件时, * 1.available == BUFF_SIZE 表示buffer满载 * 2.buffIndex < available - 1 && buffIndex > available - BUFF_EXHAUST_CRITICAL表示当前指针处于临界区内 * 3.!context.isBufferLocked()表示没有segmenter在占用buffer * 要中断当前循环(buffer要进行移位,并再读取数据的操作) * @return */ boolean needRefillBuffer() { return this.available == BUFF_SIZE && this.cursor < this.available - 1 && this.cursor > this.available - BUFF_EXHAUST_CRITICAL && !this.isBufferLocked(); } /** * 累计当前的segmentBuff相对于reader起始位置的位移 */ void markBufferOffset() { this.buffOffset += this.cursor; } /** * 向分词结果集添加词元 * @param lexeme */ void addLexeme(Lexeme lexeme) { this.orgLexemes.addLexeme(lexeme); } /** * 添加分词结果路径 * 路径起始位置 ---> 路径 映射表 * @param path */ void addLexemePath(LexemePath path) { if (path != null) { this.pathMap.put(path.getPathBegin(), path); } } /** * 返回原始分词结果 * @return */ QuickSortSet getOrgLexemes() { return this.orgLexemes; } /** * 推送分词结果到结果集合 * 1.从buff头部遍历到this.cursor已处理位置 * 2.将map中存在的分词结果推入results * 3.将map中不存在的CJDK字符以单字方式推入results */ void outputToResult() { int index = 0; for (; index <= this.cursor;) { // 跳过非CJK字符 if (CharacterUtil.CHAR_USELESS == this.charTypes[index]) { index++; continue; } // 从pathMap找出对应index位置的LexemePath LexemePath path = this.pathMap.get(index); if (path != null) { // 输出LexemePath中的lexeme到results集合 Lexeme l = path.pollFirst(); while (l != null) { this.results.add(l); // 将index移至lexeme后 index = l.getBegin() + l.getLength(); l = path.pollFirst(); if (l != null) { // 输出path内部,词元间遗漏的单字 for (; index < l.getBegin(); index++) { this.outputSingleCJK(index); } } } } else {// pathMap中找不到index对应的LexemePath // 单字输出 this.outputSingleCJK(index); index++; } } // 清空当前的Map this.pathMap.clear(); } /** * 对CJK字符进行单字输出 * @param index */ private void outputSingleCJK(int index) { if (CharacterUtil.CHAR_CHINESE == this.charTypes[index]) { Lexeme singleCharLexeme = new Lexeme(this.buffOffset, index, 1, Lexeme.TYPE_CNCHAR); this.results.add(singleCharLexeme); } else if (CharacterUtil.CHAR_OTHER_CJK == this.charTypes[index]) { Lexeme singleCharLexeme = new Lexeme(this.buffOffset, index, 1, Lexeme.TYPE_OTHER_CJK); this.results.add(singleCharLexeme); } } /** * 返回lexeme * * 同时处理合并 * @return */ Lexeme getNextLexeme() { // 从结果集取出,并移除第一个Lexme Lexeme result = this.results.pollFirst(); while (result != null) { // 数量词合并 this.compound(result); if (Dictionary.getSingleton().isStopWord(this.segmentBuff, result.getBegin(), result.getLength())) { // 是停止词继续取列表的下一个 result = this.results.pollFirst(); } else { // 不是停止词, 生成lexeme的词元文本,输出 result.setLexemeText(String.valueOf(segmentBuff, result.getBegin(), result.getLength())); break; } } return result; } /** * 重置分词上下文状态 */ void reset() { this.buffLocker.clear(); this.orgLexemes = new QuickSortSet(); this.available = 0; this.buffOffset = 0; this.charTypes = new int[BUFF_SIZE]; this.cursor = 0; this.results.clear(); this.segmentBuff = new char[BUFF_SIZE]; this.pathMap.clear(); } /** * 组合词元 */ private void compound(Lexeme result) { if (!this.cfg.useSmart()) { return; } // 数量词合并处理 if (!this.results.isEmpty()) { if (Lexeme.TYPE_ARABIC == result.getLexemeType()) { Lexeme nextLexeme = this.results.peekFirst(); boolean appendOk = false; if (Lexeme.TYPE_CNUM == nextLexeme.getLexemeType()) { // 合并英文数词+中文数词 appendOk = result.append(nextLexeme, Lexeme.TYPE_CNUM); } else if (Lexeme.TYPE_COUNT == nextLexeme.getLexemeType()) { // 合并英文数词+中文量词 appendOk = result.append(nextLexeme, Lexeme.TYPE_CQUAN); } if (appendOk) { // 弹出 this.results.pollFirst(); } } // 可能存在第二轮合并 if (Lexeme.TYPE_CNUM == result.getLexemeType() && !this.results.isEmpty()) { Lexeme nextLexeme = this.results.peekFirst(); boolean appendOk = false; if (Lexeme.TYPE_COUNT == nextLexeme.getLexemeType()) { // 合并中文数词+中文量词 appendOk = result.append(nextLexeme, Lexeme.TYPE_CQUAN); } if (appendOk) { // 弹出 this.results.pollFirst(); } } } } }