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Core module containing all storage functionality.
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/**
 * Copyright (c) 2011, University of Konstanz, Distributed Systems Group
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * * Neither the name of the University of Konstanz nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL  BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * Bucket Layer for Treetank
 * 
 * Contains all bucket kinds and bucket utils.
 * 
 * 
 * The buckets are namely
 * 

 * UberBucket: Representing the main-entrance point in the bucket-structure of the structure.
 * IndirectBucket: Pointing to other buckets to multiply the fanout within the tree-structure within the
 * entire structure as well as within the sub-structures under each revision namely the RevisionRootBuckets.
 * RevisionRootBucket: Representing a single version within the structure. Offers to the ability to point
 * to any Indirect-/DataBucket (even if they were created in former versions.)
 * MetaBucket: Storing application-specific metadata in a map-structure. The entries must be provided by
 * the application.
 * DataBucket: Storing application-specific datas in any structure. The data must be provided by the
 * application.
 * 
 * 
 * 
 * @author Sebastian Graf, University of Konstanz
 * @author Marc Kramis, University of Konstanz
 * 
 */
package org.treetank.bucket;