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package org.crosswire.jsword.book.jdbc;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;
import org.apache.log4j.Logger;
import org.crosswire.common.util.NetUtil;
import org.crosswire.common.util.PropertiesUtil;
import org.crosswire.common.util.StringUtil;
import org.crosswire.jsword.book.Bible;
import org.crosswire.jsword.book.BibleDriverManager;
import org.crosswire.jsword.book.BookException;
import org.crosswire.jsword.book.basic.AbstractBibleDriver;
/**
* This represents all of the JDBCBibles.
*
* <p><table border='1' cellPadding='3' cellSpacing='0'>
* <tr><td bgColor='white' class='TableRowColor'><font size='-7'>
*
* Distribution Licence:<br />
* JSword is free software; you can redistribute it
* and/or modify it under the terms of the GNU General Public License,
* version 2 as published by the Free Software Foundation.<br />
* 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.<br />
* The License is available on the internet
* <a href='http://www.gnu.org/copyleft/gpl.html'>here</a>, or by writing to:
* Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA<br />
* The copyright to this program is held by it's authors.
* </font></td></tr></table>
* @see docs.Licence
* @author Joe Walker [joe at eireneh dot com]
* @version $Id$
*/
public class JDBCBibleDriver extends AbstractBibleDriver
{
/**
* Some basic driver initialization. If we couldn't get a Bibles root
* then just give a warning but do no more. Perhaps there are other
* BibleDrivers that can cope, so this needent be a big error.
*/
private JDBCBibleDriver() throws MalformedURLException, IOException
{
log.debug("Starting");
URL root = findBibleRoot();
if (root == null)
{
log.warn("Cant find Bibles root, restart needed before service can resume.");
dir = null;
return;
}
dir = NetUtil.lengthenURL(root, "jdbc");
// To save giving off hundreds of warnings later we'll do a check on the
// setup and available Bibles now ...
if (dir.getProtocol().equals("file"))
{
File fdir = new File(dir.getFile());
if (!fdir.isDirectory())
{
log.debug("The directory '"+dir+"' does not exist.");
}
}
else
{
URL search = NetUtil.lengthenURL(dir, "list.txt");
InputStream in = search.openStream();
if (in == null)
log.debug("The remote listing file at '"+search+"' does not exist.");
}
}
/**
* Some basic info about who we are
* @param A short identifing string
*/
public String getDriverName()
{
return "JDBC";
}
/**
* Get a list of the Books available from the driver
* @return an array of book names
*/
public String[] getBibleNames()
{
if (dir == null)
return new String[0];
try
{
if (dir.getProtocol().equals("file"))
{
File fdir = new File(dir.getFile());
// Check that the dir exists
if (!fdir.isDirectory())
{
return new String[0];
}
else
{
// List all the versions
String[] temp = fdir.list(new FilenameFilter() {
public boolean accept(File parent, String name)
{
return name.endsWith(".properties");
}
});
// Chop off the .properties bit
for (int i=0; i<temp.length; i++)
{
temp[i] = temp[i].substring(0, temp[i].length()-11);
}
return temp;
}
}
else
{
// We should probably cache this in some way? This is going
// to get very slow calling this often across a network
URL search = NetUtil.lengthenURL(dir, "list.txt");
InputStream in = search.openStream();
String contents = StringUtil.read(new InputStreamReader(in));
return StringUtil.tokenize(contents, "\n");
}
}
catch (IOException ex)
{
log.warn("failed to load jdbc Bibles: "+ex);
return new String[0];
}
}
/**
* Does the named Bible exist?
* @param name The name of the version to test for
* @return true if the Bible exists
*/
public boolean exists(String name)
{
try
{
URL url = NetUtil.lengthenURL(dir, name+".properties");
return NetUtil.isFile(url);
}
catch (Exception ex)
{
return false;
}
}
/**
* Featch a currently existing Bible, read-only
* @param name The name of the version to create
* @exception BookException If the name is not valid
*/
public Bible getBible(String name) throws BookException
{
URL url = null;
try
{
url = NetUtil.lengthenURL(dir, name+".properties");
InputStream prop_in = url.openStream();
Properties prop = new Properties();
PropertiesUtil.load(prop, prop_in);
// Generate a version (un-inited) to get the default properties
JDBCBible dest = new JDBCBible(name, prop);
return dest;
}
catch (MalformedURLException ex)
{
throw new BookException("jdbc_driver_conf", ex);
}
catch (IOException ex)
{
throw new BookException("jdbc_driver_save", ex, new Object[] { url });
}
}
/**
* Create a new blank Bible read for writing
* @param name The name of the version to create
* @exception BookException If the name is not valid
*/
public Bible createBible(String name) throws BookException
{
throw new BookException("jdbc_driver_readonly");
}
/** The directory URL */
private URL dir;
/** The singleton driver */
protected static JDBCBibleDriver driver;
/** The log stream */
protected static Logger log = Logger.getLogger(JDBCBibleDriver.class);
/**
* Register ourselves with the Driver Manager
*/
static
{
try
{
driver = new JDBCBibleDriver();
BibleDriverManager.registerDriver(driver);
}
catch (Exception ex)
{
log.info("JDBCBibleDriver init failure", ex);
}
}
}
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