com.hazelcast.org.apache.calcite.rel.hint.CompositeHintPredicate Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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.org.apache.calcite.rel.hint;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.com.google.common.collect.ImmutableList;
/**
* A {@link HintPredicate} to combine multiple hint predicates into one.
*
* The composition can be {@code AND} or {@code OR}.
*/
public class CompositeHintPredicate implements HintPredicate {
//~ Enums ------------------------------------------------------------------
/** How hint predicates are composed. */
public enum Composition {
AND, OR
}
//~ Instance fields --------------------------------------------------------
private ImmutableList predicates;
private Composition composition;
/**
* Creates a {@link CompositeHintPredicate} with a {@link Composition}
* and an array of hint predicates.
*
* Make this constructor package-protected intentionally.
* Use utility methods in {@link HintPredicates}
* to create a {@link CompositeHintPredicate}.
*/
CompositeHintPredicate(Composition composition, HintPredicate... predicates) {
assert predicates != null;
assert predicates.length > 1;
for (HintPredicate predicate : predicates) {
assert predicate != null;
}
this.predicates = ImmutableList.copyOf(predicates);
this.composition = composition;
}
//~ Methods ----------------------------------------------------------------
@Override public boolean apply(RelHint hint, RelNode rel) {
return apply(composition, hint, rel);
}
private boolean apply(Composition composition, RelHint hint, RelNode rel) {
switch (composition) {
case AND:
for (HintPredicate predicate: predicates) {
if (!predicate.apply(hint, rel)) {
return false;
}
}
return true;
case OR:
default:
for (HintPredicate predicate: predicates) {
if (predicate.apply(hint, rel)) {
return true;
}
}
return false;
}
}
}