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Collection Query Engine: NoSQL indexing and query engine for Java collections with ultra-low latency

There is a newer version: 3.6.0

/**
 * Copyright 2012-2015 Niall Gallagher
 *
 * 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.googlecode.cqengine.index.compound.support;

import com.googlecode.cqengine.attribute.Attribute;

import java.util.Collections;
import java.util.List;

/**
 * A tuple (ordered list) of values, extracted from the fields of an object, according to, and in the same order as, the
 * {@link Attribute}s encapsulated in a {@link CompoundAttribute}.
 * 
 * The combination of values encapsulated in objects of this type are used as keys in compound indexes. This object
 * implements {@link Object#equals(Object)} and {@link Object#hashCode()} where the hash code is calculated from the
 * combination of values.
 *
 * @author Niall Gallagher
 */
public class CompoundValueTuple {

    private final List attributeValues;
    private final int hashCode;

    public CompoundValueTuple(List attributeValues) {
        this.attributeValues = attributeValues;
        this.hashCode = attributeValues.hashCode();
    }

    public Iterable