com.plexobject.testplayer.dao.jdbc.GenericDaoJdbc.java Source code

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Here is the source code for com.plexobject.testplayer.dao.jdbc.GenericDaoJdbc.java

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/* ===========================================================================
 * $RCS$
 * Version: $Id: GenericDaoJdbc.java,v 1.2 2007/07/14 18:06:22 shahzad Exp $
 * ===========================================================================
 *
 * TestPlayer - an automated test harness builder
 *
 * Copyright (c) 2005-2006 Shahzad Bhatti (bhatti@plexobject.com)
 *
 * 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
 *
 * The author may be contacted at bhatti@plexobject.com 
 * See http://testplayer.dev.java.net/ for more details.
 *
 */

package com.plexobject.testplayer.dao.jdbc;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.IOException;

import com.plexobject.testplayer.dao.*;
import com.plexobject.testplayer.*;

import java.sql.*;
import java.util.*;
import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

public abstract class GenericDaoJdbc<T, ID extends Serializable> extends JdbcTemplate implements GenericDao<T, ID> {
    private Class<T> persistentClass;
    private RowMapper mapper;
    private String create;
    private String idQuery;
    private String allQuery;
    private String clearQuery;

    public GenericDaoJdbc(RowMapper mapper, String create, String idQuery, String allQuery, String clearQuery) {
        super(JdbcUtil.getPooledDataSource());
        this.mapper = mapper;
        this.create = create;
        this.idQuery = idQuery;
        this.allQuery = allQuery;
        this.clearQuery = clearQuery;
        this.persistentClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass())
                .getActualTypeArguments()[0];
    }

    public Class<T> getPersistentClass() {
        return persistentClass;
    }

    public void createTable() {
        update(create);
    }

    @SuppressWarnings("unchecked")
    public T findById(ID id) {
        List<T> list = (List<T>) query(idQuery, new Object[] { id }, mapper);
        if (list == null || list.size() == 0)
            throw new DaoException("ID with " + id + " not found");
        if (list.size() > 1)
            throw new DaoException("ID with " + id + " returned multiple rows " + list);
        return list.get(0);
    }

    @SuppressWarnings("unchecked")
    public List<T> findAll() {
        return query(allQuery, new Object[0], mapper);
    }

    public void clear() {
        update(clearQuery, new Object[0]);
    }

    protected static Object getBlobObject(ResultSet rs, int n) throws SQLException {
        Blob blob = rs.getBlob(n);
        return toObject(blob);
    }

    protected static Object toObject(Blob blob) {
        try {
            if (blob == null)
                return null;
            InputStream in = blob.getBinaryStream();
            if (in == null)
                return null;
            int c;
            ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
            while ((c = in.read()) != -1) {
                out.write(c);
            }
            byte[] b = out.toByteArray();
            if (b.length == 0)
                return null;
            ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(b));
            Object object = ois.readObject();
            ois.close();
            return object;
        } catch (RuntimeException e) {
            throw e;
        } catch (Exception e) {
            throw new DaoException("Failed to deserialize", e);
        }
    }
}