cassandra-trunk/src/java/org/apache/cassandra/db/lifecycle/SSTableIntervalTree.java
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 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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 * Unless required by applicable law or agreed to in writing,
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package org.apache.cassandra.db.lifecycle;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import com.google.common.collect.Iterables;

import org.apache.cassandra.db.PartitionPosition;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.utils.Interval;
import org.apache.cassandra.utils.IntervalTree;

public class SSTableIntervalTree extends IntervalTree<PartitionPosition, SSTableReader, Interval<PartitionPosition, SSTableReader>>
{
    private static final SSTableIntervalTree EMPTY = new SSTableIntervalTree(null);

    SSTableIntervalTree(Collection<Interval<PartitionPosition, SSTableReader>> intervals)
    {
        super(intervals);
    }

    public static SSTableIntervalTree empty()
    {
        return EMPTY;
    }

    public static SSTableIntervalTree build(Iterable<SSTableReader> sstables)
    {
        return new SSTableIntervalTree(buildIntervals(sstables));
    }

    public static List<Interval<PartitionPosition, SSTableReader>> buildIntervals(Iterable<SSTableReader> sstables)
    {
        List<Interval<PartitionPosition, SSTableReader>> intervals = new ArrayList<>(Iterables.size(sstables));
        for (SSTableReader sstable : sstables)
            intervals.add(Interval.<PartitionPosition, SSTableReader>create(sstable.first, sstable.last, sstable));
        return intervals;
    }
}
