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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 io.trino.execution.warnings;

import com.google.common.collect.ImmutableList;
import com.google.errorprone.annotations.ThreadSafe;
import com.google.errorprone.annotations.concurrent.GuardedBy;
import io.trino.spi.TrinoWarning;

import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import static java.util.Objects.requireNonNull;

@ThreadSafe
public class DefaultWarningCollector
        implements WarningCollector
{
    @GuardedBy("this")
    private final Set warnings = new LinkedHashSet<>();
    private final int maxWarnings;

    public DefaultWarningCollector(WarningCollectorConfig config)
    {
        this.maxWarnings = requireNonNull(config, "config is null").getMaxWarnings();
    }

    @Override
    public synchronized void add(TrinoWarning warning)
    {
        requireNonNull(warning, "warning is null");
        if (warnings.size() < maxWarnings) {
            warnings.add(warning);
        }
    }

    @Override
    public synchronized List getWarnings()
    {
        return ImmutableList.copyOf(warnings);
    }
}