adammurdoch 2003/02/20 21:15:52
Modified: vfs/src/java/org/apache/commons/vfs FileUtil.java
Added: vfs/src/java/org/apache/commons/vfs/example Shell.java
Log:
Added an example command-line shell.
Revision Changes Path
1.4 +28 -1
jakarta-commons-sandbox/vfs/src/java/org/apache/commons/vfs/FileUtil.java
Index: FileUtil.java
===================================================================
RCS file:
/home/cvs/jakarta-commons-sandbox/vfs/src/java/org/apache/commons/vfs/FileUtil.java,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- FileUtil.java 12 Feb 2003 07:56:09 -0000 1.3
+++ FileUtil.java 21 Feb 2003 05:15:51 -0000 1.4
@@ -57,6 +57,7 @@
import java.io.IOException;
import java.io.InputStream;
+import java.io.OutputStream;
/**
* Utility methods for dealng with FileObjects.
@@ -99,5 +100,31 @@
return buf;
}
+ /**
+ * Writes the content of a file to an OutputStream.
+ */
+ public static void writeContent( final FileObject file,
+ final OutputStream outstr )
+ throws IOException
+ {
+ final InputStream instr = file.getContent().getInputStream();
+ try
+ {
+ final byte[] buffer = new byte[ 1024 ];
+ while ( true )
+ {
+ final int nread = instr.read( buffer );
+ if ( nread < 0 )
+ {
+ break;
+ }
+ outstr.write( buffer, 0, nread );
+ }
+ }
+ finally
+ {
+ instr.close();
+ }
+ }
}
1.1
jakarta-commons-sandbox/vfs/src/java/org/apache/commons/vfs/example/Shell.java
Index: Shell.java
===================================================================
/* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.commons.vfs.example;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.StringTokenizer;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileSystemManager;
import org.apache.commons.vfs.FileType;
import org.apache.commons.vfs.FileUtil;
import org.apache.commons.vfs.VFS;
import org.apache.commons.vfs.Selectors;
/**
* A simple command-line shell for performing file operations.
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Adam Murdoch</a>
* @version $Revision: 1.1 $ $Date: 2003/02/21 05:15:51 $
*/
public class Shell
{
private final FileSystemManager mgr;
private FileObject cwd;
private BufferedReader reader;
public static void main( final String[] args )
{
try
{
( new Shell() ).go();
}
catch ( Exception e )
{
e.printStackTrace();
System.exit( 1 );
}
System.exit( 0 );
}
private Shell() throws FileSystemException
{
mgr = VFS.getManager();
cwd = mgr.resolveFile( System.getProperty( "user.dir" ) );
reader = new BufferedReader( new InputStreamReader( System.in ) );
}
private void go() throws Exception
{
while ( true )
{
final String[] cmd = nextCommand();
if ( cmd == null )
{
return;
}
if ( cmd.length == 0 )
{
continue;
}
final String cmdName = cmd[ 0 ];
if ( cmdName.equalsIgnoreCase( "exit" ) )
{
return;
}
try
{
handleCommand( cmd );
}
catch ( final Exception e )
{
System.err.println( "Command failed:" );
e.printStackTrace( System.err );
}
}
}
/** Handles a command. */
private void handleCommand( final String[] cmd ) throws Exception
{
final String cmdName = cmd[ 0 ];
if ( cmdName.equalsIgnoreCase( "cat" ) )
{
cat( cmd );
}
else if ( cmdName.equalsIgnoreCase( "cd" ) )
{
cd( cmd );
}
else if ( cmdName.equalsIgnoreCase( "cp" ) )
{
cp( cmd );
}
else if ( cmdName.equalsIgnoreCase( "help" ) )
{
help();
}
else if ( cmdName.equalsIgnoreCase( "ls" ) )
{
ls( cmd );
}
else if ( cmdName.equalsIgnoreCase( "pwd" ) )
{
pwd();
}
else if ( cmdName.equalsIgnoreCase( "rm" ) )
{
rm( cmd );
}
else
{
System.err.println( "Unknown command \"" + cmdName + "\"." );
}
}
/** Does a 'help' command. */
private void help()
{
System.out.println( "Commands:" );
System.out.println( "cat <file> Displays the contents of a file." );
System.out.println( "cd [folder] Changes current folder." );
System.out.println( "cp <src> <dest> Copies a file or folder." );
System.out.println( "help Shows this message." );
System.out.println( "ls [-R] [folder] Lists contents of a folder." );
System.out.println( "pwd Displays current folder." );
System.out.println( "rm <path> Deletes a file or folder." );
}
/** Does an 'rm' command. */
private void rm( final String[] cmd ) throws Exception
{
if ( cmd.length < 2 )
{
throw new Exception( "USAGE: rm <path>" );
}
final FileObject file = mgr.resolveFile( cwd, cmd[ 1 ] );
file.delete( Selectors.SELECT_SELF );
}
/** Does a 'cp' command. */
private void cp( final String[] cmd ) throws Exception
{
if ( cmd.length < 3 )
{
throw new Exception( "USAGE: cp <src> <dest>" );
}
final FileObject src = mgr.resolveFile( cwd, cmd[ 1 ] );
FileObject dest = mgr.resolveFile( cwd, cmd[ 2 ] );
if ( dest.exists() && dest.getType() == FileType.FOLDER )
{
dest = dest.resolveFile( src.getName().getBaseName() );
}
dest.copyFrom( src, Selectors.SELECT_ALL );
}
/** Does a 'cat' command. */
private void cat( final String[] cmd ) throws Exception
{
if ( cmd.length < 2 )
{
throw new Exception( "USAGE: cat <path>" );
}
// Locate the file
final FileObject file = mgr.resolveFile( cwd, cmd[ 1 ] );
// Dump the contents to System.out
FileUtil.writeContent( file, System.out );
System.out.println();
}
/** Does a 'pwd' command. */
private void pwd()
{
System.out.println( "Current folder is " + cwd.getName() );
}
/** Does a 'cd' command. */
private void cd( final String[] cmd ) throws Exception
{
final String path;
if ( cmd.length > 1 )
{
path = cmd[ 1 ];
}
else
{
path = System.getProperty( "user.home" );
}
// Locate and validate the folder
cwd = mgr.resolveFile( cwd, path );
System.out.println( "Current folder is " + cwd.getName() );
}
/** Does an 'ls' command. */
private void ls( final String[] cmd ) throws FileSystemException
{
int pos = 1;
final boolean recursive;
if ( cmd.length > pos && cmd[ pos ].equals( "-R" ) )
{
recursive = true;
pos++;
}
else
{
recursive = false;
}
final FileObject dir;
if ( cmd.length > pos )
{
dir = mgr.resolveFile( cwd, cmd[ pos ] );
}
else
{
dir = cwd;
}
// List the contents
System.out.println( "Contents of " + dir.getName() );
listChildren( dir, recursive, "" );
}
/** Lists the children of a folder. */
private void listChildren( final FileObject dir,
final boolean recursive,
final String prefix )
throws FileSystemException
{
final FileObject[] children = dir.getChildren();
for ( int i = 0; i < children.length; i++ )
{
final FileObject child = children[ i ];
System.out.print( prefix );
System.out.print( child.getName().getBaseName() );
if ( child.getType() == FileType.FOLDER )
{
System.out.println( "/" );
if ( recursive )
{
listChildren( child, recursive, prefix + " " );
}
}
else
{
System.out.println();
}
}
}
/** Returns the next command, split into tokens. */
private String[] nextCommand() throws IOException
{
System.out.print( "> " );
final String line = reader.readLine();
if ( line == null )
{
return null;
}
final ArrayList cmd = new ArrayList();
final StringTokenizer tokens = new StringTokenizer( line );
while ( tokens.hasMoreTokens() )
{
cmd.add( tokens.nextToken() );
}
return (String[])cmd.toArray( new String[ cmd.size() ] );
}
}
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