com.hazelcast.collection.impl.queue.ForwardingQueueItemComparator Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2021, 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.collection.impl.queue;
import javax.annotation.Nonnull;
import java.util.Comparator;
import java.util.Objects;
/**
* A comparator which forwards its {@link Comparator#compare(Object, Object)}
* to another supplied comparator.
*
* @param the type of objects that may be compared by the delegated comparator
* as defined by the supplied comparator instance in {QueueConfig}
*/
public final class ForwardingQueueItemComparator implements Comparator {
private final Comparator customComparator;
public ForwardingQueueItemComparator(@Nonnull Comparator customComparator) {
Objects.requireNonNull(customComparator, "Custom comparator cannot be null.");
this.customComparator = customComparator;
}
@Override
public int compare(QueueItem o1, QueueItem o2) {
T object1 = o1.getDeserializedObject();
T object2 = o2.getDeserializedObject();
return this.customComparator.compare(object1, object2);
}
@Override
public String toString() {
return "ForwardingQueueItemComparator{" + super.toString() + "} ";
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
ForwardingQueueItemComparator that = (ForwardingQueueItemComparator) o;
return Objects.equals(customComparator, that.customComparator);
}
@Override
public int hashCode() {
return Objects.hash(customComparator);
}
}