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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * 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
 *
 * 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 org.apache.cassandra.db;

import java.nio.ByteBuffer;

import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.memory.AbstractAllocator;

/**
 * The threshold between two different ranges, i.e. a shortcut for the combination of two ClusteringBounds -- one
 * specifying the end of one of the ranges, and its (implicit) complement specifying the beginning of the other.
 */
public class ClusteringBoundary extends ClusteringBoundOrBoundary
{
    protected ClusteringBoundary(Kind kind, ByteBuffer[] values)
    {
        super(kind, values);
    }

    public static ClusteringBoundary create(Kind kind, ByteBuffer[] values)
    {
        assert kind.isBoundary();
        return new ClusteringBoundary(kind, values);
    }

    @Override
    public ClusteringBoundary invert()
    {
        return create(kind().invert(), values);
    }

    @Override
    public ClusteringBoundary copy(AbstractAllocator allocator)
    {
        return (ClusteringBoundary) super.copy(allocator);
    }

    public ClusteringPrefix minimize()
    {
        if (!ByteBufferUtil.canMinimize(values))
            return this;
        return new ClusteringBoundary(kind, ByteBufferUtil.minimizeBuffers(values));
    }

    public ClusteringBound openBound(boolean reversed)
    {
        return ClusteringBound.create(kind.openBoundOfBoundary(reversed), values);
    }

    public ClusteringBound closeBound(boolean reversed)
    {
        return ClusteringBound.create(kind.closeBoundOfBoundary(reversed), values);
    }
}