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NullFilter.java
Package: Weka-3-2.rar [view]
Upload User: rhdiban
Upload Date: 2013-08-09
Package Size: 15085k
Code Size: 3k
Category:
Windows Develop
Development Platform:
Java
- /*
- * 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.
- */
- /*
- * NullFilter.java
- * Copyright (C) 1999 Len Trigg
- *
- */
- package weka.filters;
- import java.io.*;
- import java.util.*;
- import weka.core.*;
- /**
- * A simple instance filter that allows no instances to pass
- * through. Basically just for testing purposes.
- *
- * @author Len Trigg (trigg@cs.waikato.ac.nz)
- * @version $Revision: 1.7 $
- */
- public class NullFilter extends Filter {
- /**
- * 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);
- setOutputFormat(instanceInfo);
- 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");
- }
- return false;
- }
- /**
- * 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 NullFilter(), argv);
- } else {
- Filter.filterFile(new NullFilter(), argv);
- }
- } catch (Exception ex) {
- System.out.println(ex.getMessage());
- }
- }
- }