/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.kernel.impl.query;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.neo4j.graphdb.QueryStatistics;
import org.neo4j.values.AnyValue;

public class RecordingQuerySubscriber extends ProbingQuerySubscriber implements QuerySubscriber {
    private List<AnyValue[]> all = new ArrayList<>();
    private AnyValue[] current;
    private Throwable throwable;
    private QueryStatistics statistics = QueryStatistics.EMPTY;

    public RecordingQuerySubscriber(QuerySubscriberProbe probe) {
        super(probe);
    }

    public RecordingQuerySubscriber() {
        super();
    }

    @Override
    public void onResult(int numberOfFields) {
        super.onResult(numberOfFields);
        this.current = new AnyValue[numberOfFields];
    }

    @Override
    public void onField(int offset, AnyValue value) {
        super.onField(offset, value);
        current[offset] = value;
    }

    @Override
    public void onRecordCompleted() {
        super.onRecordCompleted();
        all.add(Arrays.copyOf(current, current.length));
    }

    @Override
    public void onError(Throwable throwable) {
        super.onError(throwable);
        if (this.throwable == null) {
            this.throwable = throwable;
        }
    }

    @Override
    public void onResultCompleted(QueryStatistics statistics) {
        super.onResultCompleted(statistics);
        this.statistics = statistics;
    }

    public List<AnyValue[]> getOrThrow() throws Throwable {
        assertNoErrors();
        return all;
    }

    public void assertNoErrors() throws Throwable {
        if (throwable != null) {
            throw throwable;
        }
    }

    public QueryStatistics queryStatistics() {
        return statistics;
    }
}
