wordwriter.java

使用OSGi框架开发的分布式电子辞典

/*
 * @(#)WordWriter.java
 * 
 * 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 3 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 Library 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 cn.edu.ynu.sei.dict.plugin.dictmanager;

import cn.edu.ynu.sei.dict.core.exception.DuplicateWordException;
import cn.edu.ynu.sei.dict.core.exception.NotFoundWordException;
import cn.edu.ynu.sei.dict.core.service.IDictEditService;
import cn.edu.ynu.sei.dict.core.service.Word;
import cn.edu.ynu.sei.dict.plugin.db.connector.service.IDatabaseConnector;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Update words to db.
 * @author zy
 * @author 88250
 * @version 1.0.0.1, Mar 10, 2008
 */
public class WordWriter implements IDictEditService {

    private IDatabaseConnector dbConnector = null;
    private Connection con = null;
    private Statement stm = null;
    private PreparedStatement preStm = null;
    private ResultSet rs = null;

    /**
     * Constructor with argument.
     * @param dbConnector dictionary manager
     */
    public WordWriter(IDatabaseConnector dbConnector) {
        this.dbConnector = dbConnector;
    }

    @Override
    public void addVocabulary(Word vocabulary) throws DuplicateWordException {
        WordReader wordReader = new WordReader(this.dbConnector);
        try {
            wordReader.lookup(vocabulary);
            throw new DuplicateWordException("此单词已存在");
        } catch (NotFoundWordException ex) {
            this.persistWordToUserDict(vocabulary);
        }
    }

    @Override
    public void deleteVocabulary(Word vocabulary) throws NotFoundWordException {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public void editVocabulary(Word vocabulary) {
        if (vocabulary.defComeFrom == null) {
            this.updateWord(vocabulary);
        } else {
            this.updateWordToUserDict(vocabulary);
        }
    }

    /**
     * Add a word to database.
     * @param word
     *         the new word to be added to db.
     */
    public void persisWord(Word word) {
        String sql = "insert into word (self,def,src) value(?,?,?)";
        con = dbConnector.getDBConnection();

        try {
            preStm = con.prepareStatement(sql);
            preStm.setString(1, word.self);
            preStm.setString(2, word.definition);
            preStm.setString(3, word.defComeFrom);
            preStm.executeUpdate();
            preStm.close();
            con.close();
        } catch (SQLException ex) {
            Logger.getLogger(WordWriter.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Update a word to database.
     * @param word
     *         the word to be updated.
     */
    public void updateWord(Word word) {
        String sql = "update word set def='" + word.definition +
                "' where self='" + word.self + "'";
        try {
            con = dbConnector.getDBConnection();
            stm = con.createStatement();
            stm.executeUpdate(sql);
            stm.close();
            con.close();
        } catch (SQLException ex) {
            Logger.getLogger(WordWriter.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Add a preword to database.
     * @param word
     *         the new preword to be added to db.
     */
    public void persisPreWord(Word word) {
        String sql = "insert into preword (self,def,src) value(?,?,?)";
        con = dbConnector.getDBConnection();

        try {
            preStm = con.prepareStatement(sql);
            preStm.setString(1, word.self);
            preStm.setString(2, word.definition);
            preStm.setString(3, word.defComeFrom);
            preStm.executeUpdate();
            preStm.close();
            con.close();
        } catch (SQLException ex) {
            Logger.getLogger(WordWriter.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Delete a preword from predictionary.
     * @param id
     *         the id of the prevocabulary
     */
    public void deletePreWord(int id) {
        try {
            String sql = "delete from preword where id='" + id + "'";
            con = dbConnector.getDBConnection();
            stm = con.createStatement();
            stm.executeUpdate(sql);
            stm.close();
            con.close();
        } catch (SQLException ex) {
            Logger.getLogger(WordWriter.class.getName()).log(Level.SEVERE, null,
                    ex);
        }
    }

    /**
     * Add a new to user dict.
     * @param word
     *         the new word.
     */
    public void persistWordToUserDict(Word word) {
        String sql = "insert into userdict (name,self,def) value(?,?,?)";
        con = dbConnector.getDBConnection();
        try {
            preStm = con.prepareStatement(sql);
            preStm.setString(1, word.defComeFrom);
            preStm.setString(2, word.self);
            preStm.setString(3, word.definition);
            preStm.executeUpdate();
            preStm.close();
            con.close();
        } catch (SQLException ex) {
            Logger.getLogger(WordWriter.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Update a particular user's word.
     * @param word
     *         the word to be updated.
     */
    public void updateWordToUserDict(Word word) {
        String sql = "update userdict set def=? where name=? and self=?";
        con = dbConnector.getDBConnection();
        try {
            preStm = con.prepareStatement(sql);
            preStm.setString(1, word.definition);
            preStm.setString(2, word.defComeFrom);
            preStm.setString(3, word.self);
            preStm.executeUpdate();
            preStm.close();
            con.close();
        } catch (SQLException ex) {
            Logger.getLogger(WordWriter.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}