[JGIT PATCH v3 04/23] Added the class Rule.

@@ -0,0 +1,61 @@
+/*
+ *  Copyright (C) 2008 Florian Köberle
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public
+ *  License, version 2, as published by the Free Software Foundation.
+ *
+ *  This library 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
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+ */
+package org.spearce.jgit.treewalk.rules;
+
+/**
+ * A Rule defines what to do with a files which match a specified
+ * {@link FilePattern}.
+ */
+public class Rule {
+	private boolean ignoreAtMatch;
+
+	private FilePattern pattern;
+
+	/**
+	 * 
+	 * @param ignoreAtMatch
+	 *            defines if the rules ignores or accepts at a match.
+	 * @param pattern
+	 *            the pattern used to test if a file matches.
+	 */
+	Rule(boolean ignoreAtMatch, FilePattern pattern) {
+		this.ignoreAtMatch = ignoreAtMatch;
+		this.pattern = pattern;
+	}
+
+	FilePattern getPattern() {
+		return pattern;
+	}
+
+	boolean isIgnoreAtMatch() {
+		return ignoreAtMatch;
+	}
+
+	Rule getRuleForSubDirectory(String directoryName) {
+		final FilePattern subPattern = pattern
+				.getPatternForSubDirectory(directoryName);
+		if (subPattern == pattern) {
+			return this;
+		}
+		return new Rule(ignoreAtMatch, subPattern);
+	}
+
+	boolean isSameForSubDirectories() {
+		return pattern.isSameForSubDirectories();
+	}
+
+}