/* Copyright (C) 2002 Univ. of Massachusetts Amherst, Computer Science Dept.
This file is part of "MALLET" (MAchine Learning for LanguagE Toolkit).
http://www.cs.umass.edu/~mccallum/mallet
This software is provided under the terms of the Common Public License,
version 1.0, as published by http://www.opensource.org. For further
information, see the file `LICENSE' included with this distribution. */
package cc.mallet.pipe;
import java.io.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.net.URI;
import java.util.Iterator;
import java.util.ArrayList;
import cc.mallet.pipe.iterator.*;
import cc.mallet.types.Instance;
import cc.mallet.util.RegexFileFilter;
/**
* Convert a File object representing a directory into a FileIterator which
* iterates over files in the directory matching a pattern and which extracts
* a label from each file path to become the target field of the instance.
@author Andrew McCallum <a href="mailto:mccallum@cs.umass.edu">mccallum@cs.umass.edu</a>
*/
public class Directory2FileIterator extends Pipe
{
FileFilter fileFilter = null;
Pattern labelPattern = null;
public Directory2FileIterator (FileFilter fileFilter, Pattern labelRegex)
{
this.fileFilter = fileFilter;
this.labelPattern = labelRegex;
}
public Directory2FileIterator (Pattern absolutePathRegex,
Pattern filenameRegex,
Pattern labelRegex)
{
this (new RegexFileFilter (absolutePathRegex, filenameRegex), labelRegex);
}
public Directory2FileIterator (String filenameRegex)
{
this (new RegexFileFilter (filenameRegex), null);
}
public Directory2FileIterator ()
{
// Leave fileFilter == null
}
public Instance pipe (Instance carrier)
{
File directory = (File) carrier.getData();
carrier.setData(new FileIterator (directory, fileFilter, labelPattern));
return carrier;
}
public Iterator pipe (File directory)
{
return new FileIterator (directory, fileFilter, labelPattern);
}
public Iterator pipe (URI directory)
{
return pipe (new File (directory));
}
public Iterator pipe (String directory)
{
return pipe (new File (directory));
}
}