Subversion Repositories splitter

/*
 * Copyright (C) 2012.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 or
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */
 package uk.me.parabola.splitter;

import java.io.File;
import java.io.IOException;

/**
 * Stores long/int pairs. Only useful with data that is already in key-sorted order.
 *
 */
interface Long2IntClosedMapFunction {
        /**
         * Add a new pair. The key must be higher than then any existing key in the map.  
         * @param key the key value
         * @param val the value
         * @return the position in which the key was inserted
         */
        public int add(long key, int val);
        /**
         * Get the value for the key.
         * @param key
         * @return
         */
        public int getRandom(long key);
        /**
         * Get the value for the key from a map that was written to temporary
         * file.
         * @param key the key
         * @return unassigned if the current key is higher, the vaue if the key matches  
         */
        public int getSeq(long key);
       
        public long size();
        public int defaultReturnValue();
        /**
         *      Remove temp files if they exist.
         */
        void finish();
       
        /**
         * Cclose the temp file, reset the current values. Use this to start
         * from the beginning.
         * @throws IOException
         */
        public void close() throws IOException;
       
        /**
         * Move the data stored in the map to a temp file. This makes the map read only
         * and allows only sequential access.
         * @param directory
         * @throws IOException
         */
        void switchToSeqAccess(File directory) throws IOException;
        /**
         * Return the position of the key if found in the map
         * @param key
         * @return the position or a negative value to indicate "not found"
         */
        public int getKeyPos(long key);
        /**
         * Replace the value for an existing key.
         * @param key
         * @param val
         * @return the previously stored value
         */
        public int replace(long key, int val);
        public void stats(final String prefix);
}