uk.org.retep.util.classloader.DirectoryClassLoader Maven / Gradle / Ivy
/*
* Copyright (c) 1998-2007, Peter T Mount
* 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 retep.org.uk nor the names of its 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
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR 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 uk.org.retep.util.classloader;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;
import uk.org.retep.util.io.FileUtils;
/**
* A ClassLoader that will load classes from a single directory.
*
* @author peter
*/
public class DirectoryClassLoader
extends CachingInputStreamClassLoader
{
private final File directory;
public DirectoryClassLoader( final String directory )
{
this( new File( directory ) );
}
public DirectoryClassLoader( final File directory )
{
super();
this.directory = directory;
}
public DirectoryClassLoader( final String directory,
final ClassLoader parent )
{
super( parent );
this.directory = new File( directory );
}
public DirectoryClassLoader( final File directory, final ClassLoader parent )
{
super( parent );
this.directory = directory;
}
private File getClassFile( final String classname )
{
final String filename = classname.replace( '.', File.separatorChar ) + ".class";
return new File( directory, filename );
}
@Override
protected byte[] readBytes( final String className )
throws IOException
{
return FileUtils.readBytes( getClassFile( className ) );
}
@Override
protected URL findResource( final String name )
{
final File file = new File( directory, name );
FileUtils.assertFileInsideDirectory( directory, file );
if( file.exists() && file.canRead() )
{
try
{
return file.toURI().toURL();
}
catch( MalformedURLException ex )
{
// ignore, return null to indicate it does not exist
return null;
}
}
return null;
}
}