/*
* 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 <http://www.gnu.org/licenses/>.
*/
/*
* Obfuscate.java
* Copyright (C) 2002-2012 University of Waikato, Hamilton, New Zealand
*
*/
package weka.filters.unsupervised.attribute;
import weka.core.Attribute;
import weka.core.Capabilities;
import weka.core.Capabilities.Capability;
import weka.core.FastVector;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.RevisionUtils;
import weka.filters.Filter;
import weka.filters.StreamableFilter;
import weka.filters.UnsupervisedFilter;
/**
<!-- globalinfo-start -->
* 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 or relational attributes.
* <p/>
<!-- globalinfo-end -->
*
* @author Len Trigg (len@reeltwo.com)
* @version $Revision: 8578 $
*/
public class Obfuscate
extends Filter
implements UnsupervisedFilter, StreamableFilter {
/** for serialization */
static final long serialVersionUID = -343922772462971561L;
/**
* Returns a string describing this filter
*
* @return a description of the filter suitable for
* displaying in the explorer/experimenter gui
*/
public String globalInfo() {
return
"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 or relational attributes.";
}
/**
* Returns the Capabilities of this filter.
*
* @return the capabilities of this object
* @see Capabilities
*/
public Capabilities getCapabilities() {
Capabilities result = super.getCapabilities();
result.disableAll();
// attributes
result.enableAllAttributes();
result.enable(Capability.MISSING_VALUES);
// class
result.enableAllClasses();
result.enable(Capability.MISSING_CLASS_VALUES);
result.enable(Capability.NO_CLASS);
return result;
}
/**
* 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
* @throws Exception if
*/
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.DATE:
String format = oldAtt.getDateFormat();
newAtt = new Attribute("A" + (i + 1), format);
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:
case Attribute.RELATIONAL:
default:
newAtt = (Attribute) oldAtt.copy();
System.err.println("Not converting attribute: " + oldAtt.name());
break;
}
newAtt.setWeight(oldAtt.weight());
v.addElement(newAtt);
}
Instances newHeader = new Instances("R", v, 10);
newHeader.setClassIndex(instanceInfo.classIndex());
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().
* @throws 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;
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 8578 $");
}
/**
* Main method for testing this class.
*
* @param argv should contain arguments to the filter: use -h for help
*/
public static void main(String [] argv) {
runFilter(new Obfuscate(), argv);
}
}