/*
 * Copyright 2019 Amazon.com, Inc. or its affiliates.
 * 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 software.amazon.kinesis.metrics;

import java.util.List;
import java.util.Objects;

import software.amazon.awssdk.services.cloudwatch.model.Dimension;
import software.amazon.awssdk.services.cloudwatch.model.MetricDatum;

/**
 * A representation of a key of a MetricDatum. This class is useful when wanting to compare
 * whether 2 keys have the same MetricDatum. This feature will be used in MetricAccumulatingQueue
 * where we aggregate metrics across multiple MetricScopes.
 */
public class CloudWatchMetricKey {

    private List<Dimension> dimensions;
    private String metricName;

    /**
     * @param datum data point
     */
    public CloudWatchMetricKey(MetricDatum datum) {
        this.dimensions = datum.dimensions();
        this.metricName = datum.metricName();
    }

    @Override
    public int hashCode() {
        return Objects.hash(dimensions, metricName);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        CloudWatchMetricKey other = (CloudWatchMetricKey) obj;
        return Objects.equals(other.dimensions, dimensions) && Objects.equals(other.metricName, metricName);
    }
}
