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74 lines
2.6 KiB
74 lines
2.6 KiB
// kelondroBytesIntMap.java
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// (C) 2006 by Michael Peter Christen; mc@anomic.de, Frankfurt a. M., Germany
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// first published 18.06.2006 on http://www.anomic.de
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.kelondro;
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import java.io.IOException;
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import java.util.Iterator;
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public class kelondroBytesIntMap {
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private kelondroIndex ki;
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public kelondroBytesIntMap(kelondroIndex ki) throws IOException {
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assert (ki.row().columns() == 2); // must be a key/index relation
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assert (ki.row().width(1) == 4); // the value must be a b256-encoded int, 4 bytes long
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this.ki = ki;
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}
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public int geti(byte[] key) throws IOException {
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kelondroRow.Entry indexentry = ki.get(key);
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if (indexentry == null) return -1;
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return (int) indexentry.getColLongB256(1);
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}
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public int puti(byte[] key, int i) throws IOException {
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kelondroRow.Entry newentry = ki.row().newEntry();
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newentry.setCol(0, key);
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newentry.setColLongB256(1, i);
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kelondroRow.Entry oldentry = ki.put(newentry);
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if (oldentry == null) return -1;
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return (int) oldentry.getColLongB256(1);
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}
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public int removei(byte[] key) throws IOException {
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if (ki.size() == 0) return -1;
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kelondroRow.Entry indexentry = ki.remove(key);
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if (indexentry == null) return -1;
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return (int) indexentry.getColLongB256(1);
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}
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public int size() throws IOException {
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return ki.size();
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}
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public Iterator rows(boolean up, boolean rotating, byte[] firstKey) throws IOException {
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// returns the row-iterator of the underlying kelondroIndex
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// col[0] = key
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// col[1] = integer as {b265}
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return ki.rows(up, rotating, firstKey);
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}
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}
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