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- /*
- * Copyright (C) 2010, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.diff;
-
- import junit.framework.TestCase;
-
- import org.eclipse.jgit.lib.Constants;
-
- public class SimilarityIndexTest extends TestCase {
- public void testIndexing() {
- 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)));
- }
-
- public void testCommonScore_SameFiles() {
- 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));
- assertEquals(100, dst.score(src));
- }
-
- public void testCommonScore_EmptyFiles() {
- SimilarityIndex src = hash("");
- SimilarityIndex dst = hash("");
- assertEquals(0, src.common(dst));
- assertEquals(0, dst.common(src));
- }
-
- public void testCommonScore_TotallyDifferentFiles() {
- SimilarityIndex src = hash("A\n");
- SimilarityIndex dst = hash("D\n");
- assertEquals(0, src.common(dst));
- assertEquals(0, dst.common(src));
- }
-
- public void testCommonScore_SimiliarBy75() {
- 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));
- assertEquals(75, dst.score(src));
- }
-
- private static SimilarityIndex hash(String text) {
- SimilarityIndex src = new SimilarityIndex() {
- @Override
- void hash(byte[] raw, int ptr, final int end) {
- while (ptr < end) {
- int hash = raw[ptr] & 0xff;
- int start = ptr;
- do {
- int c = raw[ptr++] & 0xff;
- if (c == '\n')
- break;
- } while (ptr < end && ptr - start < 64);
- add(hash, ptr - start);
- }
- }
- };
- byte[] raw = Constants.encode(text);
- src.setFileSize(raw.length);
- src.hash(raw, 0, raw.length);
- src.sort();
- return src;
- }
-
- private static int keyFor(String line) {
- SimilarityIndex si = hash(line);
- assertEquals("single line scored", 1, si.size());
- return si.key(0);
- }
- }
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