querymanager.java

一个用于搜索本地文件内容的小型搜索引擎

package queries;

import java.util.ArrayList;
import java.util.List;

public class QueryManager implements IQueryManagement {
	/**
	 * using the builder to build an expression
	 */
	private IExpression builder;
	/**
	 * a list to store stop words
	 */
	private List<String> stopWordsList;

	public QueryManager(){
		builder = new NewExpressionBuilder();
		stopWordsList = new ArrayList<String>();
	}
	
	public void addStopWord(String word) {
		stopWordsList.add(word);
	}

	public void addStopWords(String[] words) {
		for(int i = 0;i < words.length;i++){
			stopWordsList.add(words[i]);
		}
	}

	public Query createQuery(String str) {
		try{
			return builder.buildExpression(str);
		}catch(Exception ex){
			System.out.println("The expression you written might be wrong");
		}
		return null;
		
	}
	
	

	public void removeStopWord(String word) {
		stopWordsList.remove(word);
	}
}