124 lines
3.4 KiB
Java
124 lines
3.4 KiB
Java
/*
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* Copyright (c) 2019 Joel Therrien.
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package ca.joeltherrien.randomforest.covariates;
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import ca.joeltherrien.randomforest.Row;
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import ca.joeltherrien.randomforest.tree.Split;
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import ca.joeltherrien.randomforest.utils.SingletonIterator;
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import lombok.Getter;
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import lombok.RequiredArgsConstructor;
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import java.util.*;
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@RequiredArgsConstructor
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public final class BooleanCovariate implements Covariate<Boolean> {
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@Getter
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private final String name;
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@Getter
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private final int index;
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private boolean hasNAs = false;
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private final BooleanSplitRule splitRule = new BooleanSplitRule(); // there's only one possible rule for BooleanCovariates.
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@Override
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public <Y> Iterator<Split<Y, Boolean>> generateSplitRuleUpdater(List<Row<Y>> data, int number, Random random) {
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return new SingletonIterator<>(this.splitRule.applyRule(data));
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}
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@Override
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public BooleanValue createValue(Boolean value) {
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return new BooleanValue(value);
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}
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@Override
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public Value<Boolean> createValue(String value) {
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if(value == null || value.equalsIgnoreCase("na")){
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hasNAs = true;
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return createValue( (Boolean) null);
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}
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if(value.equalsIgnoreCase("true")){
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return createValue(true);
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}
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else if(value.equalsIgnoreCase("false")){
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return createValue(false);
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}
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else{
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throw new IllegalArgumentException("Require either true/false/na to create BooleanCovariate");
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}
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}
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@Override
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public boolean hasNAs() {
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return hasNAs;
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}
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@Override
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public String toString(){
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return "BooleanCovariate(name=" + name + ")";
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}
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public class BooleanValue implements Value<Boolean>{
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private final Boolean value;
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private BooleanValue(final Boolean value){
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this.value = value;
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}
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@Override
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public BooleanCovariate getParent() {
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return BooleanCovariate.this;
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}
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@Override
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public Boolean getValue() {
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return value;
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}
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@Override
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public boolean isNA() {
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return value == null;
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}
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}
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public class BooleanSplitRule implements SplitRule<Boolean>{
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@Override
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public final String toString() {
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return "BooleanSplitRule";
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}
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@Override
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public BooleanCovariate getParent() {
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return BooleanCovariate.this;
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}
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@Override
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public boolean isLeftHand(final Value<Boolean> value) {
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if(value.isNA()) {
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throw new IllegalArgumentException("Trying to determine split on missing value");
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}
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return !value.getValue();
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}
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}
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}
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