| /* |
| * 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; |
| import org.apache.samoa.moa.AbstractMOAObject; |
| |
| /** |
| * Abstract conditional test for instances to use to split nodes in Hoeffding trees. |
| * |
| * @author Richard Kirkby (rkirkby@cs.waikato.ac.nz) |
| * @version $Revision: 7 $ |
| */ |
| public abstract class InstanceConditionalTest extends AbstractMOAObject { |
| |
| /** |
| * Returns the number of the branch for an instance, -1 if unknown. |
| * |
| * @param inst |
| * the instance to be used |
| * @return the number of the branch for an instance, -1 if unknown. |
| */ |
| public abstract int branchForInstance(Instance inst); |
| |
| /** |
| * Gets whether the number of the branch for an instance is known. |
| * |
| * @param inst |
| * @return true if the number of the branch for an instance is known |
| */ |
| public boolean resultKnownForInstance(Instance inst) { |
| return branchForInstance(inst) >= 0; |
| } |
| |
| /** |
| * Gets the number of maximum branches, -1 if unknown. |
| * |
| * @return the number of maximum branches, -1 if unknown.. |
| */ |
| public abstract int maxBranches(); |
| |
| /** |
| * Gets the text that describes the condition of a branch. It is used to describe the branch. |
| * |
| * @param branch |
| * the number of the branch to describe |
| * @param context |
| * the context or header of the data stream |
| * @return the text that describes the condition of the branch |
| */ |
| public abstract String describeConditionForBranch(int branch, |
| InstancesHeader context); |
| |
| /** |
| * Returns an array with the attributes that the test depends on. |
| * |
| * @return an array with the attributes that the test depends on |
| */ |
| public abstract int[] getAttsTestDependsOn(); |
| } |