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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.viatra.internal.update;
import tools.refinery.viatra.runtime.matchers.context.IInputKey;
import tools.refinery.viatra.runtime.matchers.context.IQueryRuntimeContextListener;
import tools.refinery.viatra.runtime.matchers.tuple.ITuple;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import java.util.Arrays;
import java.util.Objects;
public final class RelationViewFilter {
private final IInputKey inputKey;
private final Object[] seed;
private final IQueryRuntimeContextListener listener;
public RelationViewFilter(IInputKey inputKey, ITuple seed, IQueryRuntimeContextListener listener) {
this.inputKey = inputKey;
this.seed = seedToArray(seed);
this.listener = listener;
}
public void update(Tuple updateTuple, boolean isInsertion) {
if (isMatching(updateTuple)) {
listener.update(inputKey, updateTuple, isInsertion);
}
}
private boolean isMatching(ITuple tuple) {
if (seed == null) {
return true;
}
int size = seed.length;
for (int i = 0; i < size; i++) {
var filterElement = seed[i];
if (filterElement != null && !filterElement.equals(tuple.get(i))) {
return false;
}
}
return true;
}
// Use <code>null</code> instead of an empty array to speed up comparisons.
@SuppressWarnings("squid:S1168")
private static Object[] seedToArray(ITuple seed) {
for (var element : seed.getElements()) {
if (element != null) {
return seed.getElements();
}
}
return null;
}
@Override
public boolean equals(Object obj) {
if (obj == this) return true;
if (obj == null || obj.getClass() != this.getClass()) return false;
var that = (RelationViewFilter) obj;
return Objects.equals(this.inputKey, that.inputKey) && Arrays.equals(this.seed, that.seed) &&
Objects.equals(this.listener, that.listener);
}
@Override
public int hashCode() {
return Objects.hash(inputKey, Arrays.hashCode(seed), listener);
}
}
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