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/*
* SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.language.semantics.model.internal;
import org.eclipse.collections.api.factory.primitive.IntObjectMaps;
import tools.refinery.store.map.Cursor;
import tools.refinery.store.representation.TruthValue;
import tools.refinery.store.tuple.Tuple;
class DecisionTree implements MutableSeed<TruthValue> {
private final int levels;
private final DecisionTreeNode root;
public DecisionTree(int levels, TruthValue initialValue) {
this.levels = levels;
DecisionTreeNode node = new TerminalNode(IntObjectMaps.mutable.empty(),
DecisionTreeValue.fromTruthValue(initialValue));
for (int level = 1; level < levels; level++) {
node = new IntermediateNode(IntObjectMaps.mutable.empty(), node);
}
root = node;
}
public DecisionTree(int levels) {
this(levels, null);
}
@Override
public int arity() {
return levels;
}
@Override
public Class<TruthValue> valueType() {
return TruthValue.class;
}
@Override
public TruthValue reducedValue() {
return root.getOtherwiseReducedValue().getTruthValue();
}
@Override
public TruthValue get(Tuple tuple) {
return root.getValue(levels - 1, tuple).getTruthValue();
}
@Override
public void mergeValue(Tuple tuple, TruthValue truthValue) {
if (truthValue != null) {
root.mergeValue(levels - 1, tuple, truthValue);
}
}
@Override
public void setIfMissing(Tuple tuple, TruthValue truthValue) {
if (truthValue != null) {
root.setIfMissing(levels - 1, tuple, truthValue);
}
}
@Override
public void setAllMissing(TruthValue truthValue) {
if (truthValue != null) {
root.setAllMissing(truthValue);
}
}
@Override
public void overwriteValues(MutableSeed<TruthValue> values) {
if (!(values instanceof DecisionTree decisionTree)) {
throw new IllegalArgumentException("Incompatible overwrite: " + values);
}
root.overwriteValues(decisionTree.root);
}
public TruthValue getReducedValue() {
var reducedValue = root.getReducedValue();
return reducedValue == null ? null : reducedValue.getTruthValue();
}
@Override
public Cursor<Tuple, TruthValue> getCursor(TruthValue defaultValue, int nodeCount) {
return new DecisionTreeCursor(levels, defaultValue, nodeCount, root);
}
}
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