/* ==================================================================   
 * Created [2009-4-27 下午11:32:55] by Jon.King 
 * ==================================================================  
 * TSS 
 * ================================================================== 
 * mailTo:jinpujun@hotmail.com
 * Copyright (c) Jon.King, 2009-2012 
 * ================================================================== 
 */

package com.jinhe.tss.cms.lucene;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.net.URL;

import jeasy.analysis.MMAnalyzer;

import org.apache.log4j.Logger;
import org.apache.lucene.analysis.Analyzer;

import com.jinhe.tss.core.util.URLUtil;
 
/**
 * 全文检索分词器MMAnalyzer创建工厂类。
 */
public class AnalyzerFactory {
    
    private static final String DICTIONARY_FILE = "dictionary.txt";
    
	private static Logger log = Logger.getLogger(AnalyzerFactory.class);
    
    private AnalyzerFactory(){
    }
    
    private static Analyzer analyzer;

    /**
     * 创建一个分词解析对象。
     * @return
     */
    public static Analyzer createAnalyzer(){
        if(analyzer == null){
            // 此处采用MMAnalyzer，分词粒度为2（分词粒度：当字数等于或超过该参数，且能成词，该词就被切分出来 ）
            analyzer = new MMAnalyzer(2);
            
            try {
                URL dictionaryPath = URLUtil.getResourceFileUrl(DICTIONARY_FILE);
                if(dictionaryPath != null){
                    File dictionaryFile = new File(dictionaryPath.getPath());
                    MMAnalyzer.addDictionary(new FileReader(dictionaryFile));
                }
            } catch (Exception e) {
                log.error("加载字典文件出错", e);
            }
        }
        return analyzer;
    }
    
    /**
     * 将搜索关键字加入到新字典中
     * @param searchStr
     * @return
     */
    public static Analyzer createAnalyzer(String searchStr){
        analyzer = createAnalyzer();
        
        if( !MMAnalyzer.contains(searchStr) ){
            MMAnalyzer.addWord(searchStr);
            
            // 写到自己建的词典文件里去
            try {
                URL dictionaryPath = URLUtil.getResourceFileUrl(DICTIONARY_FILE);
                if(dictionaryPath != null){
                    // FileWriter的第二个参数true表示追加文件到尾部
                    FileWriter fileWriter = new FileWriter(dictionaryPath.getPath(), true);
					BufferedWriter bw = new BufferedWriter(fileWriter);   
                    bw.write(searchStr); // 追加文件内容   
                    bw.newLine();
                    bw.close();
                }
            } catch (Exception e) {
                log.error("写入字典文件出错", e);
            }
        }
        return analyzer;
    }
}