| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.samoa.moa.classifiers.core.conditionaltests; |
| |
| import org.apache.samoa.instances.Instance; |
| import org.apache.samoa.instances.InstancesHeader; |
| |
| /** |
| * Nominal multi way conditional test for instances to use to split nodes in Hoeffding trees. |
| * |
| * @author Richard Kirkby (rkirkby@cs.waikato.ac.nz) |
| * @version $Revision: 7 $ |
| */ |
| public class NominalAttributeMultiwayTest extends InstanceConditionalTest { |
| |
| private static final long serialVersionUID = 1L; |
| |
| protected int attIndex; |
| |
| public NominalAttributeMultiwayTest(int attIndex) { |
| this.attIndex = attIndex; |
| } |
| |
| @Override |
| public int branchForInstance(Instance inst) { |
| int instAttIndex = this.attIndex; // < inst.classIndex() ? this.attIndex |
| // : this.attIndex + 1; |
| return inst.isMissing(instAttIndex) ? -1 : (int) inst.value(instAttIndex); |
| } |
| |
| @Override |
| public String describeConditionForBranch(int branch, InstancesHeader context) { |
| return InstancesHeader.getAttributeNameString(context, this.attIndex) |
| + " = " |
| + InstancesHeader.getNominalValueString(context, this.attIndex, |
| branch); |
| } |
| |
| @Override |
| public int maxBranches() { |
| return -1; |
| } |
| |
| @Override |
| public void getDescription(StringBuilder sb, int indent) { |
| // TODO Auto-generated method stub |
| } |
| |
| @Override |
| public int[] getAttsTestDependsOn() { |
| return new int[] { this.attIndex }; |
| } |
| } |