/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.search.aggregations.bucket.composite;

import org.opensearch.core.common.io.stream.StreamInput;
import org.opensearch.core.common.io.stream.StreamOutput;
import org.opensearch.core.common.io.stream.Writeable;

import java.io.IOException;
import java.util.Arrays;

/**
 * A key that is composed of multiple {@link Comparable} values.
 *
 * @opensearch.internal
 */
public class CompositeKey implements Writeable {
    private final Comparable[] values;

    CompositeKey(Comparable... values) {
        this.values = values;
    }

    CompositeKey(StreamInput in) throws IOException {
        values = in.readArray(i -> (Comparable) i.readGenericValue(), Comparable[]::new);
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        out.writeArray(StreamOutput::writeGenericValue, values);
    }

    Comparable[] values() {
        return values;
    }

    public int size() {
        return values.length;
    }

    public Comparable get(int pos) {
        assert pos < values.length;
        return values[pos];
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        CompositeKey that = (CompositeKey) o;
        return Arrays.equals(values, that.values);
    }

    @Override
    public int hashCode() {
        return Arrays.hashCode(values);
    }

    @Override
    public String toString() {
        return "CompositeKey{" + "values=" + Arrays.toString(values) + '}';
    }
}
