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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.query.InvalidQueryException;
import tools.refinery.store.tuple.Tuple;
import tools.refinery.store.representation.Symbol;
import java.util.Objects;
import java.util.function.BiPredicate;
import java.util.function.Predicate;
public class FilteredView<T> extends TuplePreservingView<T> {
private final BiPredicate<Tuple, T> predicate;
public FilteredView(Symbol<T> symbol, String name, BiPredicate<Tuple, T> predicate) {
super(symbol, name);
this.predicate = predicate;
}
public FilteredView(Symbol<T> symbol, BiPredicate<Tuple, T> predicate) {
super(symbol);
this.predicate = predicate;
}
public FilteredView(Symbol<T> symbol, String name, Predicate<T> predicate) {
this(symbol, name, (k, v) -> predicate.test(v));
validateDefaultValue(predicate);
}
public FilteredView(Symbol<T> symbol, Predicate<T> predicate) {
this(symbol, (k, v) -> predicate.test(v));
validateDefaultValue(predicate);
}
@Override
protected boolean doFilter(Tuple key, T value) {
return this.predicate.test(key, value);
}
@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;
FilteredView<?> that = (FilteredView<?>) o;
return Objects.equals(predicate, that.predicate);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), predicate);
}
private void validateDefaultValue(Predicate<T> predicate) {
var defaultValue = getSymbol().defaultValue();
boolean matchesDefaultValue = false;
try {
matchesDefaultValue = predicate.test(defaultValue);
} catch (NullPointerException e) {
if (defaultValue != null) {
throw e;
}
// The predicate doesn't need to handle the default value if it is null.
}
if (matchesDefaultValue) {
throw new InvalidQueryException("Tuples with default value %s cannot be enumerated in %s"
.formatted(defaultValue, getSymbol()));
}
}
}
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