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/*
 * 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.facebook.presto.jdbc.internal.spi.statistics;

import com.facebook.presto.jdbc.internal.drift.annotations.ThriftConstructor;
import com.facebook.presto.jdbc.internal.drift.annotations.ThriftField;
import com.facebook.presto.jdbc.internal.drift.annotations.ThriftStruct;

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

import static com.facebook.presto.jdbc.internal.drift.annotations.ThriftField.Requiredness.OPTIONAL;
import static java.lang.String.format;
import static java.util.Collections.emptyList;
import static java.util.Collections.unmodifiableList;

@ThriftStruct
public class HistoricalPlanStatistics
{
    private static final HistoricalPlanStatistics EMPTY = new HistoricalPlanStatistics(emptyList());

    // Output plan statistics from previous runs
    private final List lastRunsStatistics;

    @ThriftConstructor
    public HistoricalPlanStatistics(List lastRunsStatistics)
    {
        // Check for nulls, to make it thrift backwards compatible
        this.lastRunsStatistics = unmodifiableList(lastRunsStatistics == null ? emptyList() : lastRunsStatistics);
    }

    @ThriftField(value = 1, requiredness = OPTIONAL)
    public List getLastRunsStatistics()
    {
        return lastRunsStatistics;
    }

    @Override
    public String toString()
    {
        return format("HistoricalPlanStatistics{lastRunsStatistics=%s}", lastRunsStatistics);
    }

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

        HistoricalPlanStatistics other = (HistoricalPlanStatistics) o;

        return Objects.equals(lastRunsStatistics, other.lastRunsStatistics);
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(lastRunsStatistics);
    }

    public static HistoricalPlanStatistics empty()
    {
        return EMPTY;
    }
}