/*
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Obfuscate.java
* Copyright (C) 2002 University of Waikato
*
*/
package weka.filters.unsupervised.attribute;
import weka.filters.*;
import java.io.*;
import java.util.*;
import weka.core.*;
/**
* A simple instance filter that renames the relation, all attribute names
* and all nominal (and string) attribute values. For exchanging sensitive
* datasets. Currently doesn't like string attributes.
*
* @author Len Trigg (len@reeltwo.com)
* @version $Revision: 1.1.1.1 $
*/
public class Obfuscate extends Filter implements UnsupervisedFilter,
StreamableFilter {
/**
* Returns a string describing this filter
*
* @return a description of the filter suitable for
* displaying in the explorer/experimenter gui
*/
public String globalInfo() {
return "An instance filter that obfuscates all strings in the data";
}
/**
* Sets the format of the input instances.
*
* @param instanceInfo an Instances object containing the input instance
* structure (any instances contained in the object are ignored - only the
* structure is required).
* @return true if the outputFormat may be collected immediately
*/
public boolean setInputFormat(Instances instanceInfo) throws Exception {
super.setInputFormat(instanceInfo);
// Make the obfuscated header
FastVector v = new FastVector();
for (int i = 0; i < instanceInfo.numAttributes(); i++) {
Attribute oldAtt = instanceInfo.attribute(i);
Attribute newAtt = null;
switch (oldAtt.type()) {
case Attribute.NUMERIC:
newAtt = new Attribute("A" + (i + 1));
break;
case Attribute.NOMINAL:
FastVector vals = new FastVector();
for (int j = 0; j < oldAtt.numValues(); j++) {
vals.addElement("V" + (j + 1));
}
newAtt = new Attribute("A" + (i + 1), vals);
break;
case Attribute.STRING:
default:
newAtt = (Attribute) oldAtt.copy();
System.err.println("Not converting attribute: " + oldAtt.name());
break;
}
v.addElement(newAtt);
}
Instances newHeader = new Instances("R", v, 10);
setOutputFormat(newHeader);
return true;
}
/**
* Input an instance for filtering. Ordinarily the instance is processed
* and made available for output immediately. Some filters require all
* instances be read before producing output.
*
* @param instance the input instance
* @return true if the filtered instance may now be
* collected with output().
* @exception IllegalStateException if no input format has been set.
*/
public boolean input(Instance instance) {
if (getInputFormat() == null) {
throw new IllegalStateException("No input instance format defined");
}
if (m_NewBatch) {
resetQueue();
m_NewBatch = false;
}
push((Instance)instance.copy());
return true;
}
/**
* Main method for testing this class.
*
* @param argv should contain arguments to the filter: use -h for help
*/
public static void main(String [] argv) {
try {
if (Utils.getFlag('b', argv)) {
Filter.batchFilterFile(new Obfuscate(), argv);
} else {
Filter.filterFile(new Obfuscate(), argv);
}
} catch (Exception ex) {
System.out.println(ex.getMessage());
}
}
}