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/*
* Copyright (C) 2010, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.diff;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import org.eclipse.jgit.diff.SimilarityIndex.TableFullException;
import org.eclipse.jgit.lib.Constants;
import org.junit.Test;
public class SimilarityIndexTest {
@Test
public void testIndexingSmallObject() throws TableFullException {
SimilarityIndex si = hash("" //
+ "A\n" //
+ "B\n" //
+ "D\n" //
+ "B\n" //
);
int key_A = keyFor("A\n");
int key_B = keyFor("B\n");
int key_D = keyFor("D\n");
assertTrue(key_A != key_B && key_A != key_D && key_B != key_D);
assertEquals(3, si.size());
assertEquals(2, si.count(si.findIndex(key_A)));
assertEquals(4, si.count(si.findIndex(key_B)));
assertEquals(2, si.count(si.findIndex(key_D)));
}
@Test
public void testIndexingLargeObject() throws IOException,
TableFullException {
byte[] in = ("" //
+ "A\n" //
+ "B\n" //
+ "B\n" //
+ "B\n").getBytes(UTF_8);
SimilarityIndex si = new SimilarityIndex();
si.hash(new ByteArrayInputStream(in), in.length, false);
assertEquals(2, si.size());
}
@Test
public void testCommonScore_SameFiles() throws TableFullException {
String text = "" //
+ "A\n" //
+ "B\n" //
+ "D\n" //
+ "B\n";
SimilarityIndex src = hash(text);
SimilarityIndex dst = hash(text);
assertEquals(8, src.common(dst));
assertEquals(8, dst.common(src));
assertEquals(100, src.score(dst, 100));
assertEquals(100, dst.score(src, 100));
}
@Test
public void testCommonScore_SameFiles_CR_canonicalization()
throws TableFullException {
String text = "" //
+ "A\r\n" //
+ "B\r\n" //
+ "D\r\n" //
+ "B\r\n";
SimilarityIndex src = hash(text);
SimilarityIndex dst = hash(text.replace("\r", ""));
assertEquals(8, src.common(dst));
assertEquals(8, dst.common(src));
assertEquals(100, src.score(dst, 100));
assertEquals(100, dst.score(src, 100));
}
@Test
public void testCommonScoreLargeObject_SameFiles_CR_canonicalization()
throws TableFullException, IOException {
String text = "" //
+ "A\r\n" //
+ "B\r\n" //
+ "D\r\n" //
+ "B\r\n";
SimilarityIndex src = new SimilarityIndex();
byte[] bytes1 = text.getBytes(UTF_8);
src.hash(new ByteArrayInputStream(bytes1), bytes1.length, true);
src.sort();
SimilarityIndex dst = new SimilarityIndex();
byte[] bytes2 = text.replace("\r", "").getBytes(UTF_8);
dst.hash(new ByteArrayInputStream(bytes2), bytes2.length, true);
dst.sort();
assertEquals(8, src.common(dst));
assertEquals(8, dst.common(src));
assertEquals(100, src.score(dst, 100));
assertEquals(100, dst.score(src, 100));
}
@Test
public void testCommonScore_EmptyFiles() throws TableFullException {
SimilarityIndex src = hash("");
SimilarityIndex dst = hash("");
assertEquals(0, src.common(dst));
assertEquals(0, dst.common(src));
}
@Test
public void testCommonScore_TotallyDifferentFiles()
throws TableFullException {
SimilarityIndex src = hash("A\n");
SimilarityIndex dst = hash("D\n");
assertEquals(0, src.common(dst));
assertEquals(0, dst.common(src));
}
@Test
public void testCommonScore_SimiliarBy75() throws TableFullException {
SimilarityIndex src = hash("A\nB\nC\nD\n");
SimilarityIndex dst = hash("A\nB\nC\nQ\n");
assertEquals(6, src.common(dst));
assertEquals(6, dst.common(src));
assertEquals(75, src.score(dst, 100));
assertEquals(75, dst.score(src, 100));
}
private static SimilarityIndex hash(String text) throws TableFullException {
SimilarityIndex src = new SimilarityIndex();
byte[] raw = Constants.encode(text);
src.hash(raw, 0, raw.length);
src.sort();
return src;
}
private static int keyFor(String line) throws TableFullException {
SimilarityIndex si = hash(line);
assertEquals("single line scored", 1, si.size());
return si.key(0);
}
}
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