Introduce ParseExceptions for GitDateParser

Instead of just returning null when something was not parseable we
should throw a real ParseException. This allows us to distinguish
between specifications which are unparseable and those which represent
no date (e.g. "never")

Change-Id: Ib3c1aa64b65ed0e0270791a365f2fa72ab78a3f4

2 files changed, 100 insertions, 24 deletions

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/GitDateParserBadlyFormattedTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/GitDateParserBadlyFormattedTest.java
new file mode 100644
index 0000000000..09389591e0
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/GitDateParserBadlyFormattedTest.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2012, Christian Halstrick
+ * 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.util;
+
+import static org.junit.Assert.fail;
+
+import java.text.ParseException;
+import java.util.Calendar;
+import java.util.GregorianCalendar;
+
+import org.junit.experimental.theories.DataPoints;
+import org.junit.experimental.theories.Theories;
+import org.junit.experimental.theories.Theory;
+import org.junit.runner.RunWith;
+
+/**
+ * Tests which assert that unparseable Strings lead to ParseExceptions
+ */
+@RunWith(Theories.class)
+public class GitDateParserBadlyFormattedTest {
+	private String dateStr;
+
+	public GitDateParserBadlyFormattedTest(String dateStr) {
+		this.dateStr = dateStr;
+	}
+
+	@DataPoints
+	static public String[] getDataPoints() {
+		return new String[] { "", "1970", "3000.3000.3000", "3 yesterday ago",
+				"now yesterday ago", "yesterdays", "3.day. 2.week.ago",
+				"day ago", "Gra Feb 21 15:35:00 2007 +0100",
+				"Sun Feb 21 15:35:00 2007 +0100",
+				"Wed Feb 21 15:35:00 Grand +0100" };
+	}
+
+	@Theory
+	public void badlyFormattedWithExplicitRef() {
+		Calendar ref = new GregorianCalendar(SystemReader.getInstance()
+				.getTimeZone(), SystemReader.getInstance().getLocale());
+		try {
+			GitDateParser.parse(dateStr, ref);
+			fail("The expected ParseException while parsing '" + dateStr
+					+ "' did not occur.");
+		} catch (ParseException e) {
+			// expected
+		}
+	}
+
+	@Theory
+	public void badlyFormattedWithoutRef() {
+		try {
+			GitDateParser.parse(dateStr, null);
+			fail("The expected ParseException while parsing '" + dateStr
+					+ "' did not occur.");
+		} catch (ParseException e) {
+			// expected
+		}
+	}
+}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/GitDateParserTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/GitDateParserTest.java
index 11e2e513c6..98e84fed83 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/GitDateParserTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/GitDateParserTest.java
@@ -62,30 +62,7 @@ public class GitDateParserTest {
 	}
 
 	@Test
-	public void badlyFormatted() {
-		Calendar ref = new GregorianCalendar(SystemReader.getInstance()
-				.getTimeZone(), SystemReader.getInstance().getLocale());
-		Assert.assertNull(GitDateParser.parse("foo", ref));
-		Assert.assertNull(GitDateParser.parse("", ref));
-		Assert.assertNull(GitDateParser.parse("", null));
-		Assert.assertNull(GitDateParser.parse("1970", ref));
-		Assert.assertNull(GitDateParser.parse("3000.3000.3000", ref));
-		Assert.assertNull(GitDateParser.parse("3 yesterday ago", ref));
-		Assert.assertNull(GitDateParser.parse("now yesterday ago", ref));
-		Assert.assertNull(GitDateParser.parse("yesterdays", ref));
-		Assert.assertNull(GitDateParser.parse("3.day. 2.week.ago", ref));
-		Assert.assertNull(GitDateParser.parse("day ago", ref));
-		Assert.assertNull(GitDateParser.parse("Gra Feb 21 15:35:00 2007 +0100",
-				null));
-		Assert.assertNull(GitDateParser.parse("Sun Feb 21 15:35:00 2007 +0100",
-				null));
-		Assert.assertNull(GitDateParser.parse(
-				"Wed Feb 21 15:35:00 Grand +0100",
-				null));
-	}
-
-	@Test
-	public void yesterday() {
+	public void yesterday() throws ParseException {
 		GregorianCalendar cal = new GregorianCalendar(SystemReader
 				.getInstance().getTimeZone(), SystemReader.getInstance()
 				.getLocale());