/*
* 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.
*/
/*
* Add.java
* Copyright (C) 1999 University of Waikato, Hamilton, New Zealand
*
*/
package weka.filters.unsupervised.attribute;
import weka.core.Attribute;
import weka.core.Capabilities;
import weka.core.FastVector;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.Option;
import weka.core.OptionHandler;
import weka.core.Range;
import weka.core.RevisionUtils;
import weka.core.SingleIndex;
import weka.core.Utils;
import weka.core.Capabilities.Capability;
import weka.filters.Filter;
import weka.filters.StreamableFilter;
import weka.filters.UnsupervisedFilter;
import java.util.Enumeration;
import java.util.Vector;
/**
<!-- globalinfo-start -->
* An instance filter that adds a new attribute to the dataset. The new attribute will contain all missing values.
* <p/>
<!-- globalinfo-end -->
*
<!-- options-start -->
* Valid options are: <p/>
*
* <pre> -C <index>
* Specify where to insert the column. First and last
* are valid indexes.(default last)</pre>
*
* <pre> -L <label1,label2,...>
* Create nominal attribute with given labels
* (default numeric attribute)</pre>
*
* <pre> -N <name>
* Name of the new attribute.
* (default = 'Unnamed')</pre>
*
<!-- options-end -->
*
* @author Len Trigg (trigg@cs.waikato.ac.nz)
* @version $Revision: 1.7 $
*/
public class Add
extends Filter
implements UnsupervisedFilter, StreamableFilter, OptionHandler {
/** for serialization */
static final long serialVersionUID = 761386447332932389L;
/** Record the type of attribute to insert */
protected int m_AttributeType = Attribute.NUMERIC;
/** The name for the new attribute */
protected String m_Name = "unnamed";
/** The location to insert the new attribute */
private SingleIndex m_Insert = new SingleIndex("last");
/** The list of labels for nominal attribute */
protected FastVector m_Labels = new FastVector(5);
/**
* 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 adds a new attribute to the dataset."
+ " The new attribute will contain all missing values.";
}
/**
* Returns an enumeration describing the available options.
*
* @return an enumeration of all the available options.
*/
public Enumeration listOptions() {
Vector newVector = new Vector(3);
newVector.addElement(new Option(
"\tSpecify where to insert the column. First and last\n"
+"\tare valid indexes.(default last)",
"C", 1, "-C <index>"));
newVector.addElement(new Option(
"\tCreate nominal attribute with given labels\n"
+"\t(default numeric attribute)",
"L", 1, "-L <label1,label2,...>"));
newVector.addElement(new Option(
"\tName of the new attribute.\n"
+"\t(default = 'Unnamed')",
"N", 1,"-N <name>"));
return newVector.elements();
}
/**
* Parses a given list of options. <p/>
*
<!-- options-start -->
* Valid options are: <p/>
*
* <pre> -C <index>
* Specify where to insert the column. First and last
* are valid indexes.(default last)</pre>
*
* <pre> -L <label1,label2,...>
* Create nominal attribute with given labels
* (default numeric attribute)</pre>
*
* <pre> -N <name>
* Name of the new attribute.
* (default = 'Unnamed')</pre>
*
<!-- options-end -->
*
* @param options the list of options as an array of strings
* @throws Exception if an option is not supported
*/
public void setOptions(String[] options) throws Exception {
setAttributeIndex(Utils.getOption('C', options));
setNominalLabels(Utils.getOption('L', options));
setAttributeName(Utils.getOption('N', options));
if (getInputFormat() != null) {
setInputFormat(getInputFormat());
}
}
/**
* Gets the current settings of the filter.
*
* @return an array of strings suitable for passing to setOptions
*/
public String [] getOptions() {
String [] options = new String [6];
int current = 0;
options[current++] = "-N"; options[current++] = getAttributeName();
if (m_AttributeType == Attribute.NOMINAL) {
options[current++] = "-L"; options[current++] = getNominalLabels();
}
options[current++] = "-C";
options[current++] = "" + getAttributeIndex();
while (current < options.length) {
options[current++] = "";
}
return options;
}
/**
* Returns the Capabilities of this filter.
*
* @return the capabilities of this object
* @see Capabilities
*/
public Capabilities getCapabilities() {
Capabilities result = super.getCapabilities();
// 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 the format couldn't be set successfully
*/
public boolean setInputFormat(Instances instanceInfo) throws Exception {
super.setInputFormat(instanceInfo);
m_Insert.setUpper(instanceInfo.numAttributes());
Instances outputFormat = new Instances(instanceInfo, 0);
Attribute newAttribute = null;
switch (m_AttributeType) {
case Attribute.NUMERIC:
newAttribute = new Attribute(m_Name);
break;
case Attribute.NOMINAL:
newAttribute = new Attribute(m_Name, m_Labels);
break;
default:
throw new IllegalArgumentException("Unknown attribute type in Add");
}
if ((m_Insert.getIndex() < 0) ||
(m_Insert.getIndex() > getInputFormat().numAttributes())) {
throw new IllegalArgumentException("Index out of range");
}
outputFormat.insertAttributeAt(newAttribute, m_Insert.getIndex());
setOutputFormat(outputFormat);
// all attributes, except index of added attribute
// (otherwise the length of the input/output indices differ)
Range atts = new Range(m_Insert.getSingleIndex());
atts.setInvert(true);
atts.setUpper(outputFormat.numAttributes() - 1);
initOutputLocators(outputFormat, atts.getSelection());
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 defined.
*/
public boolean input(Instance instance) {
if (getInputFormat() == null) {
throw new IllegalStateException("No input instance format defined");
}
if (m_NewBatch) {
resetQueue();
m_NewBatch = false;
}
Instance inst = (Instance)instance.copy();
// First copy string values from input to output
copyValues(inst, true, inst.dataset(), getOutputFormat());
// Insert the new attribute and reassign to output
inst.setDataset(null);
inst.insertAttributeAt(m_Insert.getIndex());
inst.setDataset(getOutputFormat());
push(inst);
return true;
}
/**
* Returns the tip text for this property
*
* @return tip text for this property suitable for
* displaying in the explorer/experimenter gui
*/
public String attributeNameTipText() {
return "Set the new attribute's name.";
}
/**
* Get the name of the attribute to be created
*
* @return the new attribute name
*/
public String getAttributeName() {
return m_Name;
}
/**
* Set the new attribute's name
*
* @param name the new name
*/
public void setAttributeName(String name) {
String newName = name.trim();
if (newName.indexOf(' ') >= 0) {
if (newName.indexOf('\'') != 0) {
newName = newName.replace('\'',' ');
}
newName = '\'' + newName + '\'';
}
if (newName.equals("")) {
newName = "unnamed";
}
m_Name = newName;
}
/**
* Returns the tip text for this property
*
* @return tip text for this property suitable for
* displaying in the explorer/experimenter gui
*/
public String attributeIndexTipText() {
return "The position (starting from 1) where the attribute will be inserted "
+ "(first and last are valid indices).";
}
/**
* Get the index of the attribute used.
*
* @return the index of the attribute
*/
public String getAttributeIndex() {
return m_Insert.getSingleIndex();
}
/**
* Sets index of the attribute used.
*
* @param attIndex the index of the attribute
*/
public void setAttributeIndex(String attIndex) {
m_Insert.setSingleIndex(attIndex);
}
/**
* Returns the tip text for this property
*
* @return tip text for this property suitable for
* displaying in the explorer/experimenter gui
*/
public String nominalLabelsTipText() {
return "The list of value labels (nominal attribute creation only). "
+ " The list must be comma-separated, eg: \"red,green,blue\"."
+ " If this is empty, the created attribute will be numeric.";
}
/**
* Get the list of labels for nominal attribute creation
*
* @return the list of labels for nominal attribute creation
*/
public String getNominalLabels() {
String labelList = "";
for(int i = 0; i < m_Labels.size(); i++) {
if (i == 0) {
labelList = (String)m_Labels.elementAt(i);
} else {
labelList += "," + (String)m_Labels.elementAt(i);
}
}
return labelList;
}
/**
* Set the labels for nominal attribute creation.
*
* @param labelList a comma separated list of labels
* @throws IllegalArgumentException if the labelList was invalid
*/
public void setNominalLabels(String labelList) {
FastVector labels = new FastVector (10);
// Split the labelList up into the vector
int commaLoc;
while ((commaLoc = labelList.indexOf(',')) >= 0) {
String label = labelList.substring(0, commaLoc).trim();
if (!label.equals("")) {
labels.addElement(label);
} else {
throw new IllegalArgumentException("Invalid label list at "+
labelList.substring(commaLoc));
}
labelList = labelList.substring(commaLoc + 1);
}
String label = labelList.trim();
if (!label.equals("")) {
labels.addElement(label);
}
// If everything is OK, make the type change
m_Labels = labels;
if (labels.size() == 0) {
m_AttributeType = Attribute.NUMERIC;
} else {
m_AttributeType = Attribute.NOMINAL;
}
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 1.7 $");
}
/**
* 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 Add(), argv);
}
}