com.hazelcast.query.impl.predicates.EvaluatePredicate Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2024, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.query.impl.predicates;
import com.hazelcast.query.Predicate;
import com.hazelcast.query.impl.Index;
import com.hazelcast.query.impl.QueryContext;
import com.hazelcast.query.impl.QueryableEntry;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serial;
import java.util.Map;
import java.util.Set;
/**
* Wraps a predicate for which {@link Index#canEvaluate} returned {@code true}.
*
* Used during predicate tree optimization done by {@link EvaluateVisitor}.
* Never transferred over the wire.
*/
public final class EvaluatePredicate implements Predicate, IndexAwarePredicate {
private final Predicate predicate;
private final String indexName;
/**
* Constructs {@link EvaluatePredicate} instance for the given predicate
* which can be evaluated by the given index identified by its name.
*
* @param predicate the evaluable predicate to wrap.
* @param indexName the index which can evaluate the given predicate.
*/
public EvaluatePredicate(Predicate predicate, String indexName) {
this.predicate = predicate;
this.indexName = indexName;
}
/**
* @return the original evaluable predicate.
*/
public Predicate getPredicate() {
return predicate;
}
/**
* @return the index name of the index which can evaluate the predicate
* wrapped by this predicate instance.
*/
public String getIndexName() {
return indexName;
}
@SuppressWarnings("unchecked")
@Override
public boolean apply(Map.Entry mapEntry) {
return predicate.apply(mapEntry);
}
@Override
public Set filter(QueryContext queryContext) {
Index index = queryContext.matchIndex(indexName, QueryContext.IndexMatchHint.EXACT_NAME);
if (index == null) {
return null;
}
return index.evaluate(predicate);
}
@Override
public boolean isIndexed(QueryContext queryContext) {
return true;
}
@Override
public String toString() {
return "eval(" + predicate.toString() + ")";
}
@Serial
private void writeObject(ObjectOutputStream stream) throws IOException {
throw new UnsupportedOperationException("can't be serialized");
}
}