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A Java library for reading Apache httpd configuration files
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 *   Copyright (C) 2010-2014 Christian Bockermann 
 *    
 *   This file is part of the jwall.org apache-config library. The apache-config library is
 *   a parsing library to handle Apache HTTPD configuration files.
 *
 *   More information and documentation for the jwall-tools can be found at
 *   
 *                      http://www.jwall.org/apache-config
 *   
 *   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 3 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, see .
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
package org.jwall.apache.httpd.service;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import org.jwall.apache.httpd.MD5;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class AbstractFileSystem implements FileSystem {

	static Logger log = LoggerFactory.getLogger( AbstractFileSystem.class );
	List listener = new ArrayList();
	
	public void addFileSystemListener( FileSystemListener l ){
		if( ! listener.contains( l ) )
			listener.add( l );
	}
	
	public void removeFileSystemListener( FileSystemListener l ){
		if( listener.contains( l ) )
			listener.remove( l );
	}
	
	protected File map( File file ){
		return file;
	}
	
	protected File unmap( File file ){
		return file;
	}

	/**
	 * @see org.jwall.apache.httpd.service.FileSystem#md5(java.io.File)
	 */
	public String md5(File file) throws IOException {
		log.debug( "Computing md5 sum of {} (operating on {})", file, map(file) );
		if( ! exists( file ) ){
			log.debug( "   file {} does not exist!", file );
			return null;
		}
			
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		InputStream fis = openInputStream( file );
		byte[] buf = new byte[ 16 * 1024 ];
		int read = fis.read( buf );
		while( read > 0 ){
			out.write( buf, 0, read );
			read = fis.read( buf );
		}
		
		out.close();
		return MD5.md5( out.toByteArray() );
	}
	



	public void copy(File file, FileSystem fs, File targetFile ) throws IOException {
		log.debug( "   copy( {}, fs, {} )", file, targetFile );
		if( ! isSymlink( file ) ){
			log.debug( "Not a symbolic link: {}", file );
			copy( this.openInputStream( file ), fs.openOutputStream( targetFile ) );
		} else {
			String target = readSymlink( file ); // this.getAbsolutePath(targetFile).getRealPath( file );
			File real = new File( resolveSymlink( file ).getPath() );
			log.debug( "Need to copy 'real file' {} for symblic link {}", real, file );
			copy( real, fs, real );
			log.debug( "  Creating symblink link {} -> {} ", file, target );
			fs.createSymlink( target, file );
		}
	}
	
	
	public void copy( File file, FileSystem targetFs ) throws IOException {
		copy( file, targetFs, file );
	}
	
	public long copy( InputStream in, OutputStream out ) throws IOException {
		byte[] buf = new byte[ 16 * 1024 ];
		long total = 0L;
		int read = in.read( buf );
		while( read > 0 ){
			out.write( buf, 0, read );
			total += read;
			read = in.read( buf );
		}

		log.debug( "copied {} bytes ", total );
		out.flush();
		out.close();
		return total;

	}
}