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package de.lmu.ifi.dbs.elki.persistent;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import de.lmu.ifi.dbs.elki.JUnit4Test;
/**
* Test to validate proper OnDiskArray operation.
*
* @author Erich Schubert
* @since 0.2
*/
// TODO: also test with a static sample file.
public class OnDiskArrayTest implements JUnit4Test {
File file = new File("OnDiskArrayTestFile.test.dat");
/**
* Check that we don't overwrite any file.
*
* @throws Exception on errors.
*/
@Before
public void safetyCheck() throws Exception {
if(file.exists()) {
Assert.fail("Could not run test - test file already exists.");
}
}
/**
* Clean up afterwards
*
* @throws Exception on errors.
*/
@After
public void cleanup() throws Exception {
if(file != null && file.exists()) {
if(!file.delete()) {
Assert.fail("Error cleaning up: can't remove test file.");
}
}
}
/**
* Test the OnDiskArray class.
*
* @throws IOException on errors.
*/
@Test
public void dotestOnDiskArray() throws IOException {
final int extraheadersize = 2;
final int recsize = 3;
int numrec = 4;
// Only applicable to the version we are testing.
final int ODR_HEADER_SIZE = 4 * 4;
OnDiskArray array = new OnDiskArray(file, 1, extraheadersize, recsize, numrec);
byte[] header = { 42, 23 };
array.getExtraHeader().put(header);
byte[] record1 = { 31, 41, 59 };
byte[] record2 = { 26, 53, 58 };
array.getRecordBuffer(0).put(record1);
array.getRecordBuffer(1).put(record2);
array.getRecordBuffer(2).put(record2);
array.getRecordBuffer(3).put(record1);
array.resizeFile(5);
numrec = 5;
array.getRecordBuffer(4).put(record1);
array.close();
// validate file size
Assert.assertEquals("File size doesn't match.", ODR_HEADER_SIZE + extraheadersize + recsize * numrec, file.length());
OnDiskArray roarray = new OnDiskArray(file, 1, 2, 3, false);
Assert.assertEquals("Number of records incorrect.", numrec, roarray.getNumRecords());
byte[] buf = new byte[recsize];
ByteBuffer hbuf = roarray.getExtraHeader();
for(int i = 0; i < header.length; i++) {
Assert.assertEquals("Header doesn't match.", header[i], hbuf.get());
}
roarray.getRecordBuffer(0).get(buf);
Assert.assertArrayEquals("Record 0 doesn't match.", record1, buf);
roarray.getRecordBuffer(4).get(buf);
Assert.assertArrayEquals("Record 4 doesn't match.", record1, buf);
roarray.getRecordBuffer(1).get(buf);
Assert.assertArrayEquals("Record 1 doesn't match.", record2, buf);
roarray.getRecordBuffer(2).get(buf);
Assert.assertArrayEquals("Record 2 doesn't match.", record2, buf);
roarray.getRecordBuffer(3).get(buf);
Assert.assertArrayEquals("Record 3 doesn't match.", record1, buf);
}
}
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