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63 lines
2.9 KiB
63 lines
2.9 KiB
// kelondroIndex.java
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// ------------------
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// part of the Kelondro Database
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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// created: 26.10.2005
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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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/* A kelondroIndex is a table with indexed access on the first column
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Elements may be selected from the table with logarithmic computation time
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using the get-method. Inserts have also the same computation order and
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can be done with the put-method.
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The kelondro Database provides two implementations of this interface:
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kelondroTree and kelondroHashtable
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*/
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package de.anomic.kelondro.index;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.List;
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import de.anomic.kelondro.order.CloneableIterator;
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public interface ObjectIndex {
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public String filename(); // returns a unique identified for this index; can be a real or artificial file name
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public int size();
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public Row row();
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public boolean has(byte[] key); // use this only if there is no get in case that has returns true
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public Row.Entry get(byte[] key) throws IOException;
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public Row.Entry put(Row.Entry row) throws IOException;
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public Row.Entry put(Row.Entry row, Date entryDate) throws IOException;
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public void putMultiple(List<Row.Entry> rows) throws IOException; // for R/W head path optimization
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public void addUnique(Row.Entry row) throws IOException; // no double-check
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public void addUniqueMultiple(List<Row.Entry> rows) throws IOException; // no double-check
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public ArrayList<RowCollection> removeDoubles() throws IOException; // removes all elements that are double (to be used after all addUnique)
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public Row.Entry remove(byte[] key) throws IOException;
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public Row.Entry removeOne() throws IOException;
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public CloneableIterator<byte[]> keys(boolean up, byte[] firstKey) throws IOException; // iterates only the key
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public CloneableIterator<Row.Entry> rows(boolean up, byte[] firstKey) throws IOException; // iterates the whole row using the order of the keys
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public CloneableIterator<Row.Entry> rows() throws IOException; // iterates the whole row without any order
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public void deleteOnExit();
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public void clear() throws IOException;
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public void close();
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}
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