query.java

一个用于搜索本地文件内容的小型搜索引擎

package queries;

import invertedList.FileRecord;
import invertedList.IQueryResult;

import java.util.Set;

import stemmer.IStemmer;

/**
 * @author Administrator
 *	abstract class, represent a query
 */
abstract public class Query {
	protected final static int VAGUE = 0;
	protected final static int ALL = 1;
	
	//protected int mode;
	/**
	 * some queries may need to be stemmed like AND,OR
	 * using this stemmer to stem.
	 */
	protected IStemmer stemmer;
	public Query() {
		//queryProcessor = InvertedListManager.getInstance(); 
		//stemmer = new EnglishStemmer();
	}
	
	/**
	 * @param queryProcessor
	 * @return
	 * Interpreter Pattern to return the result of the query
	 */
	public abstract Set<FileRecord> doQuery(IQueryResult queryProcessor);
	


	//public abstract void setMode(int mode);

	/**
	 * stem the queryString of the query, if it is a composite query, stem its components separately.
	 */
	public abstract void setStemmer(IStemmer stemmer);
}