--- /dev/null
+/*
+ * Copyright (C) 2019, Thomas Wolf <thomas.wolf@paranor.ch>
+ * 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.treewalk;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.time.Instant;
+
+import org.junit.Test;
+
+public class InstantComparatorTest {
+
+ private final InstantComparator cmp = new InstantComparator();
+
+ @Test
+ public void compareNow() {
+ Instant now = Instant.now();
+ assertEquals(0, cmp.compare(now, now));
+ assertEquals(0, cmp.compare(now, now, true));
+ }
+
+ @Test
+ public void compareSeconds() {
+ Instant now = Instant.now();
+ Instant t = Instant.ofEpochSecond(now.getEpochSecond());
+ Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
+ assertEquals(0, cmp.compare(t, s));
+ assertEquals(0, cmp.compare(t, t));
+ assertEquals(0, cmp.compare(s, t));
+ }
+
+ @Test
+ public void compareSecondsOnly() {
+ Instant now = Instant.now();
+ Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 987654321);
+ Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
+ assertEquals(0, cmp.compare(t, s, true));
+ assertEquals(0, cmp.compare(t, t, true));
+ assertEquals(0, cmp.compare(s, t, true));
+ }
+
+ @Test
+ public void compareSecondsUnequal() {
+ Instant now = Instant.now();
+ Instant t = Instant.ofEpochSecond(now.getEpochSecond());
+ Instant s = Instant.ofEpochSecond(now.getEpochSecond() - 1L);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ }
+
+ @Test
+ public void compareMillisEqual() {
+ Instant now = Instant.now();
+ Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123000000);
+ Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
+ assertEquals(0, cmp.compare(s, t));
+ assertEquals(0, cmp.compare(t, t));
+ assertEquals(0, cmp.compare(t, s));
+ s = Instant.ofEpochSecond(now.getEpochSecond(), 123456000);
+ assertEquals(0, cmp.compare(s, t));
+ assertEquals(0, cmp.compare(t, s));
+ s = Instant.ofEpochSecond(now.getEpochSecond(), 123400000);
+ assertEquals(0, cmp.compare(s, t));
+ assertEquals(0, cmp.compare(t, s));
+ }
+
+ @Test
+ public void compareMillisUnequal() {
+ Instant now = Instant.now();
+ Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123000000);
+ Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 122000000);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ t = Instant.ofEpochSecond(now.getEpochSecond(), 130000000);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ t = Instant.ofEpochSecond(now.getEpochSecond(), 200000000);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ s = Instant.ofEpochSecond(now.getEpochSecond() - 1L, 123000000);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ }
+
+ @Test
+ public void compareMicrosEqual() {
+ Instant now = Instant.now();
+ Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456000);
+ Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
+ assertEquals(0, cmp.compare(s, t));
+ assertEquals(0, cmp.compare(t, s));
+ s = Instant.ofEpochSecond(now.getEpochSecond(), 123456700);
+ assertEquals(0, cmp.compare(s, t));
+ assertEquals(0, cmp.compare(t, s));
+ }
+
+ @Test
+ public void compareMicrosUnequal() {
+ Instant now = Instant.now();
+ Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456000);
+ Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123455000);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ t = Instant.ofEpochSecond(now.getEpochSecond(), 123460000);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ t = Instant.ofEpochSecond(now.getEpochSecond(), 123500000);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ s = Instant.ofEpochSecond(now.getEpochSecond() - 1L, 123456000);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ }
+
+ @Test
+ public void compareNanosEqual() {
+ Instant now = Instant.now();
+ Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
+ Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
+ assertEquals(0, cmp.compare(s, t));
+ assertEquals(0, cmp.compare(t, s));
+ }
+
+ @Test
+ public void compareNanosUnequal() {
+ Instant now = Instant.now();
+ Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
+ Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456700);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ t = Instant.ofEpochSecond(now.getEpochSecond(), 123456800);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ s = Instant.ofEpochSecond(now.getEpochSecond() - 1L, 123456789);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ s = Instant.ofEpochSecond(now.getEpochSecond(), 123456788);
+ assertTrue(cmp.compare(s, t) < 0);
+ assertTrue(cmp.compare(t, s) > 0);
+ }
+}
--- /dev/null
+/*
+ * Copyright (C) 2019, Thomas Wolf <thomas.wolf@paranor.ch>
+ * 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.treewalk;
+
+import java.time.Instant;
+import java.util.Comparator;
+
+/**
+ * Specialized comparator for {@link Instant}s. If either timestamp has a zero
+ * fraction, compares only seconds. If either timestamp has no time fraction
+ * smaller than a millisecond, compares only milliseconds. If either timestamp
+ * has no fraction smaller than a microsecond, compares only microseconds.
+ */
+class InstantComparator implements Comparator<Instant> {
+
+ @Override
+ public int compare(Instant a, Instant b) {
+ return compare(a, b, false);
+ }
+
+ /**
+ * Compares two {@link Instant}s to the lower resolution of the two
+ * instants. See {@link InstantComparator}.
+ *
+ * @param a
+ * first {@link Instant} to compare
+ * @param b
+ * second {@link Instant} to compare
+ * @param forceSecondsOnly
+ * whether to omit all fraction comparison
+ * @return a value < 0 if a < b, a value > 0 if a > b, and 0 if
+ * a == b
+ */
+ public int compare(Instant a, Instant b, boolean forceSecondsOnly) {
+ long aSeconds = a.getEpochSecond();
+ long bSeconds = b.getEpochSecond();
+ int result = Long.compare(aSeconds, bSeconds);
+ if (result != 0) {
+ return result;
+ }
+ int aSubSecond = a.getNano();
+ int bSubSecond = b.getNano();
+ if (forceSecondsOnly || (aSubSecond == 0)
+ || (bSubSecond == 0)) {
+ // Don't check the subseconds part.
+ return 0;
+ } else if (aSubSecond != bSubSecond) {
+ // If either has nothing smaller than a millisecond, compare only
+ // milliseconds.
+ int aSubMillis = aSubSecond % 1_000_000;
+ int bSubMillis = bSubSecond % 1_000_000;
+ if (aSubMillis == 0) {
+ bSubSecond -= bSubMillis;
+ } else if (bSubMillis == 0) {
+ aSubSecond -= aSubMillis;
+ } else {
+ // Same again, but for microsecond resolution. NTFS has 100ns
+ // resolution, but WindowsFileAttributes may provide only
+ // microseconds (1000ns). Similar for some Unix file systems.
+ int aSubMicros = aSubSecond % 1000;
+ int bSubMicros = bSubSecond % 1000;
+ if (aSubMicros == 0) {
+ bSubSecond -= bSubMicros;
+ } else if (bSubMicros == 0) {
+ aSubSecond -= aSubMicros;
+ }
+ }
+ }
+ return Integer.compare(aSubSecond, bSubSecond);
+ }
+
+}
/** The offset of the content id in {@link #idBuffer()} */
private int contentIdOffset;
+ /** A comparator for {@link Instant}s. */
+ private final InstantComparator timestampComparator = new InstantComparator();
+
/**
* Create a new iterator with no parent.
*
if (!entry.isSmudged() && entry.getLength() != (int) getEntryLength())
return MetadataDiff.DIFFER_BY_METADATA;
- // Git under windows only stores seconds so we round the timestamp
- // Java gives us if it looks like the timestamp in index is seconds
- // only. Otherwise we compare the timestamp at nanosecond precision,
- // unless core.checkstat is set to "minimal", in which case we only
- // compare the whole second part.
+ // Cache and file timestamps may differ in resolution. Therefore don't
+ // compare instants directly but use a comparator that compares only
+ // up to the lower apparent resolution of either timestamp.
+ //
+ // If core.checkstat is set to "minimal", compare only the seconds part.
Instant cacheLastModified = entry.getLastModifiedInstant();
Instant fileLastModified = getEntryLastModifiedInstant();
- if ((getOptions().getCheckStat() == CheckStat.MINIMAL)
- || (cacheLastModified.getNano() == 0)
- // Some Java version on Linux return whole seconds only even
- // when the file systems supports more precision.
- || (fileLastModified.getNano() == 0)) {
- if (fileLastModified.getEpochSecond() != cacheLastModified
- .getEpochSecond()) {
- return MetadataDiff.DIFFER_BY_TIMESTAMP;
- } else if (entry.isSmudged()) {
- return MetadataDiff.SMUDGED;
- }
- } else if (!fileLastModified.equals(cacheLastModified)) {
+ if (timestampComparator.compare(cacheLastModified, fileLastModified,
+ getOptions().getCheckStat() == CheckStat.MINIMAL) != 0) {
return MetadataDiff.DIFFER_BY_TIMESTAMP;
- } else if (entry.isSmudged()) {
+ }
+
+ if (entry.isSmudged()) {
return MetadataDiff.SMUDGED;
}
// The file is clean when when comparing timestamps
projects / jgit.git / commitdiff