com.facebook.presto.jdbc.internal.spi.statistics.TableStatisticsMetadata Maven / Gradle / Ivy
/*
* 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 java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import static java.util.Collections.emptyList;
import static java.util.Collections.emptySet;
import static java.util.Collections.unmodifiableList;
import static java.util.Collections.unmodifiableSet;
import static java.util.Objects.requireNonNull;
public class TableStatisticsMetadata
{
private static final TableStatisticsMetadata EMPTY_STATISTICS_METADATA = new TableStatisticsMetadata(emptySet(), emptySet(), emptyList());
private final Set columnStatistics;
private final Set tableStatistics;
private final List groupingColumns;
public static TableStatisticsMetadata empty()
{
return EMPTY_STATISTICS_METADATA;
}
public TableStatisticsMetadata(
Set columnStatistics,
Set tableStatistics,
List groupingColumns)
{
this.columnStatistics = unmodifiableSet(new LinkedHashSet<>(requireNonNull(columnStatistics, "columnStatistics is null")));
this.tableStatistics = unmodifiableSet(new LinkedHashSet<>(requireNonNull(tableStatistics, "tableStatistics is null")));
this.groupingColumns = unmodifiableList(new ArrayList<>(requireNonNull(groupingColumns, "groupingColumns is null")));
}
public Set getColumnStatistics()
{
return columnStatistics;
}
public Set getTableStatistics()
{
return tableStatistics;
}
public List getGroupingColumns()
{
return groupingColumns;
}
public boolean isEmpty()
{
return tableStatistics.isEmpty() && columnStatistics.isEmpty();
}
}
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