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TDB is a storage subsystem for Jena and ARQ, it is a native triple store providing persistent storage of triples/quads.

There is a newer version: 4.10.0

/*
 * 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.jena.tdb.index;

import java.util.Iterator ;

import org.apache.jena.atlas.lib.Closeable ;
import org.apache.jena.atlas.lib.Sync ;
import org.apache.jena.tdb.base.record.Record ;
import org.apache.jena.tdb.base.record.RecordFactory ;

public interface Index extends Iterable, Sync, Closeable
{
    /** Find one record - and return the record actually in the index (may have a value part) */
    public Record find(Record record) ;
    
    /** Return whether the index contains the record or not. */
    public boolean contains(Record record) ;
    
    /** Add a record - return true if an insertion was actually needed */
    public boolean add(Record record) ;
    
    /** Delete a record.  Return true if a record was actually removed */
    public boolean delete(Record record) ;
    
//    /** Empty the index */
//    public boolean clear() ;

    /** Iterate over the whole index */ 
    @Override
    public Iterator iterator() ;
    
    /** Get the Record factory associated with this index */
    public RecordFactory getRecordFactory() ;
    
    /** Close the index - can not be used again through this object */
    @Override
    public void close() ;
    
    /** Answer whether the index is empty or not.  May return false for unknown or meaningless */
    public boolean isEmpty() ;
    
    /** Clear the index */
    public void clear() ;
    
    /** Perform checks on this index */
    public void check() ;
    
    /** Return size if known else return -1 : does not count the persistent storage */
    public long size() ;
}