querymanager.java

编辑视频文件

/*
 * File:     QueryManager.java
 * Project:  MPI Linguistic Application
 * Date:     02 May 2007
 *
 * Copyright (C) 2001-2007  Max Planck Institute for Psycholinguistics
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package mpi.search.query.model;

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


/**
 * $Id: QueryManager.java,v 1.2 2007/03/09 10:12:33 klasal Exp $
 *
 * @author Alexander Klassmann
 * $Version$
 */
public class QueryManager {
    /** Holds value of property DOCUMENT ME! */
    private final List queries = new ArrayList();
    private int currentQueryNr = 0;

    /**
     * get current query
     *
     * @return current query
     */
    public Query getCurrentQuery() {
        return getQuery(currentQueryNr);
    }

    /**
     * sets current query to query with specified number has no effect, if the
     * number isn't in the range
     *
     * @param i wanted query number;
     */
    public void setCurrentQueryNumber(int i) {
        if ((0 < i) && (i <= queries.size())) {
            currentQueryNr = i;
        }
    }

    /**
     * get number of current query
     *
     * @return current query number
     */
    public int getCurrentQueryNumber() {
        return currentQueryNr;
    }

    /**
     * get query with specified number
     *
     * @param nr query number (starts with 1!)
     *
     * @return query
     */
    public Query getQuery(int nr) {
        return (Query) (((0 < nr) && (nr <= queries.size()))
        ? queries.get(nr - 1) : null);
    }

    /**
     * add query
     *
     * @param query
     */
    public void addQuery(Query query) {
        queries.add(query);
        currentQueryNr = queries.size();
    }

    /**
     * checks if current query is last one
     *
     * @return true if current query is not last one
     */
    public boolean hasNextQuery() {
        return currentQueryNr < queries.size();
    }

    /**
     * checks if current query is first one
     *
     * @return true if current query is not first one
     */
    public boolean hasPreviousQuery() {
        return currentQueryNr > 1;
    }

    /**
     * checks if there is any query
     *
     * @return if there is at least one query
     */
    public boolean hasQuery() {
        return queries.size() > 0;
    }

    /**
     * count of queries
     *
     * @return number of queries
     */
    public int size() {
        return queries.size();
    }
}