/**
 * IK 中文分词  版本 5.0
 * IK Analyzer release 5.0
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.
 * <p>
 * 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 org.wltea.analyzer.core;

import java.util.LinkedList;
import java.util.List;

import org.wltea.analyzer.dic.Dictionary;
import org.wltea.analyzer.dic.Hit;

/**
 * 中文-日韩文子分词器
 */
class CJKSegmenter implements ISegmenter {

    /**
     * 子分词器标签
     */
    private static final String SEGMENTER_NAME = "CJK_SEGMENTER";
    /**
     * 待处理的分词hit队列
     */
    private List<Hit> tmpHits;

    CJKSegmenter() {
        this.tmpHits = new LinkedList<Hit>();
    }

    @Override
    public void analyze(AnalyzeContext context) {
        if (CharacterUtil.CHAR_USELESS != context.getCurrentCharType()) {

            //优先处理tmpHits中的hit
            if (!this.tmpHits.isEmpty()) {
                //处理词段队列
                Hit[] tmpArray = this.tmpHits.toArray(new Hit[this.tmpHits.size()]);
                for (Hit hit : tmpArray) {
                    hit = Dictionary.getSingleton().matchWithHit(context.getSegmentBuff(), context.getCursor(), hit);
                    if (hit.isMatch()) {
                        //输出当前的词
                        Lexeme newLexeme = new Lexeme(context.getBufferOffset(), hit.getBegin(),
                                context.getCursor() - hit.getBegin() + 1, Lexeme.TYPE_CNWORD);
                        context.addLexeme(newLexeme);

                        if (!hit.isPrefix()) {
                            //不是词前缀，hit不需要继续匹配，移除
                            this.tmpHits.remove(hit);
                        }

                    } else if (hit.isUnmatch()) {
                        //hit不是词，移除
                        this.tmpHits.remove(hit);
                    }
                }
            }

            //*********************************
            //再对当前指针位置的字符进行单字匹配
            Hit singleCharHit =
                    Dictionary.getSingleton().matchInMainDict(context.getSegmentBuff(), context.getCursor(), 1);
            if (singleCharHit.isMatch()) {//首字成词
                //输出当前的词
                Lexeme newLexeme = new Lexeme(context.getBufferOffset(), context.getCursor(), 1, Lexeme.TYPE_CNWORD);
                context.addLexeme(newLexeme);

                //同时也是词前缀
                if (singleCharHit.isPrefix()) {
                    //前缀匹配则放入hit列表
                    this.tmpHits.add(singleCharHit);
                }
            } else if (singleCharHit.isPrefix()) {
                //首字为词前缀
                //前缀匹配则放入hit列表
                this.tmpHits.add(singleCharHit);
            }

        } else {
            //遇到CHAR_USELESS字符
            //清空队列
            this.tmpHits.clear();
        }

        //判断缓冲区是否已经读完
        if (context.isBufferConsumed()) {
            //清空队列
            this.tmpHits.clear();
        }

        //判断是否锁定缓冲区
        if (this.tmpHits.size() == 0) {
            context.unlockBuffer(SEGMENTER_NAME);

        } else {
            context.lockBuffer(SEGMENTER_NAME);
        }
    }

    @Override
    public void reset() {
        //清空队列
        this.tmpHits.clear();
    }

}
