bitstreamdao.java

dspace 用j2ee架构的一个数字图书馆.开源程序

/*
 * Copyright (c) 2004-2005, Hewlett-Packard Company and Massachusetts
 * Institute of Technology.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - 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.
 *
 * - Neither the name of the Hewlett-Packard Company nor the name of the
 * Massachusetts Institute of Technology nor the names of their
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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package org.dspace.checker;

import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;

import org.dspace.core.Context;
import org.dspace.storage.bitstore.BitstreamStorageManager;

/**
 * <p>
 * Data Access Object for Bitstreams.
 * </p>
 * 
 * @author Jim Downing
 * @author Grace Carpenter
 * @author Nathan Sarr
 * 
 */
public class BitstreamDAO
{
    /**
     * Default Constructor
     */
    public BitstreamDAO()
    {
        ;
    }

    /**
     * Retrieves the bitstream from the bitstore.
     * 
     * @param id
     *            the bitstream id.
     * 
     * @return Bitstream as an InputStream
     * 
     * @throws IOException
     *             Rethrown from BitstreamStorageManager
     * @throws SQLException
     *             Rethrown from BitstreamStorageManager
     * 
     * @see org.dspace.storage.bitstore.BitstreamStorageManager#retrieve(Context,
     *      int)
     */
    public InputStream getBitstream(int id) throws IOException, SQLException
    {

        Context context = null;
        InputStream is = null;
        try
        {
            context = new Context();
            is = BitstreamStorageManager.retrieve(context, id);
        }
        finally
        {
            context.abort();
        }

        return is;
    }
}