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/*
* SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.query.view;
import tools.refinery.store.map.CursorAsIterator;
import tools.refinery.store.model.Model;
import tools.refinery.store.query.dnf.FunctionalDependency;
import tools.refinery.store.query.term.Parameter;
import tools.refinery.store.representation.Symbol;
import tools.refinery.store.tuple.Tuple;
import tools.refinery.store.tuple.Tuple1;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
public abstract class AbstractFunctionView<T> extends SymbolView<T> {
private final List<Parameter> parameters;
protected AbstractFunctionView(Symbol<T> symbol, String name, Parameter outParameter) {
super(symbol, name);
parameters = createParameters(symbol.arity(), outParameter);
}
@Override
public Set<FunctionalDependency<Integer>> getFunctionalDependencies() {
var arity = getSymbol().arity();
var forEach = IntStream.range(0, arity).boxed().collect(Collectors.toUnmodifiableSet());
var unique = Set.of(arity);
return Set.of(new FunctionalDependency<>(forEach, unique));
}
@Override
public Set<ViewImplication> getImpliedRelationViews() {
var symbol = getSymbol();
var impliedIndices = IntStream.range(0, symbol.arity()).boxed().toList();
var keysView = new KeyOnlyView<>(symbol);
return Set.of(new ViewImplication(this, keysView, impliedIndices));
}
@Override
protected boolean doFilter(Tuple key, T value) {
return true;
}
protected Object forwardMapValue(T value) {
return value;
}
protected boolean valueEquals(T value, Object otherForwardMappedValue) {
return Objects.equals(otherForwardMappedValue, forwardMapValue(value));
}
@Override
public Object[] forwardMap(Tuple key, T value) {
int size = key.getSize();
Object[] result = new Object[size + 1];
for (int i = 0; i < size; i++) {
result[i] = Tuple.of(key.get(i));
}
result[key.getSize()] = forwardMapValue(value);
return result;
}
@Override
public boolean get(Model model, Object[] tuple) {
int[] content = new int[tuple.length - 1];
for (int i = 0; i < tuple.length - 1; i++) {
if (!(tuple[i] instanceof Tuple1 wrapper)) {
return false;
}
content[i] = wrapper.value0();
}
Tuple key = Tuple.of(content);
var valueInTuple = tuple[tuple.length - 1];
T valueInMap = model.getInterpretation(getSymbol()).get(key);
return valueEquals(valueInMap, valueInTuple);
}
@Override
public boolean canIndexSlot(int slot) {
return slot >= 0 && slot < getSymbol().arity();
}
@Override
public Iterable<Object[]> getAdjacent(Model model, int slot, Object value) {
if (!(value instanceof Tuple1 tuple1)) {
return Set.of();
}
return (() -> new CursorAsIterator<>(model.getInterpretation(getSymbol()).getAdjacent(slot, tuple1.get(0)),
this::forwardMap, this::filter));
}
@Override
public List<Parameter> getParameters() {
return parameters;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
AbstractFunctionView<?> that = (AbstractFunctionView<?>) o;
return Objects.equals(parameters, that.parameters);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), parameters);
}
private static List<Parameter> createParameters(int symbolArity, Parameter outParameter) {
var parameters = new Parameter[symbolArity + 1];
Arrays.fill(parameters, Parameter.NODE_OUT);
parameters[symbolArity] = outParameter;
return List.of(parameters);
}
}
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