datasourcejdbcconnectionmanager.java

Classifier4J是一个很好的基于java的分类器,里面有Native bayes和KNN等方法的文本分类.另外还 提供了分词和自动摘要等功能

/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 Nick Lothian. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        developers of Classifier4J (http://classifier4j.sf.net/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The name "Classifier4J" must not be used to endorse or promote
 *    products derived from this software without prior written
 *    permission. For written permission, please contact
 *    http://sourceforge.net/users/nicklothian/.
 *
 * 5. Products derived from this software may not be called
 *    "Classifier4J", nor may "Classifier4J" appear in their names
 *    without prior written permission. For written permission, please
 *    contact http://sourceforge.net/users/nicklothian/.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 */

package net.sf.classifier4J.bayesian;

import javax.naming.*;
import javax.sql.*;
import java.sql.*;

/**
 * @author Nick Lothian
 *
 */
public class DataSourceJDBCConnectionManager implements IJDBCConnectionManager {

    String datasourceContext;
    DataSource dataSource;

    public DataSourceJDBCConnectionManager(String ctx) throws NamingException, IllegalArgumentException {
        this.datasourceContext = ctx;
        Context context = new InitialContext();
        if (context == null) {
            throw new NamingException("No JNDI Inital Context Found");
        }
        dataSource = (DataSource) context.lookup(datasourceContext);
        if (dataSource == null) {
            throw new IllegalArgumentException("Could not find datasource");
        }

    }

    public String getDatasourceContext() {
        return datasourceContext;
    }

    /**
     * @see net.sf.classifier4J.bayesian.IJDBCConnectionManager#getConnection()
     */
    public Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }

    /**
     * @see net.sf.classifier4J.bayesian.IJDBCConnectionManager#returnConnection(Connection con)
     */
    public void returnConnection(Connection con) throws SQLException {
        if (con != null) {
            con.close();
        }        
    }

}