--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tmatesoft/hg/internal/LineReader.java	Tue Jul 17 22:14:21 2012 +0200
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2012 TMate Software Ltd
+ *  
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program 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.
+ *
+ * For information on how to redistribute this software under
+ * the terms of a license other than GNU General Public License
+ * contact TMate Software at support@hg4j.com
+ */
+package org.tmatesoft.hg.internal;
+
+import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Collection;
+
+import org.tmatesoft.hg.repo.HgInvalidFileException;
+import org.tmatesoft.hg.repo.ext.MqManager;
+import org.tmatesoft.hg.util.LogFacility;
+
+/**
+ * Handy class to read line-based configuration files
+ * 
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public final class LineReader {
+		
+		public interface LineConsumer<T> {
+	//		boolean begin(File f, T paramObj) throws IOException;
+			boolean consume(String line, T paramObj) throws IOException;
+	//		boolean end(File f, T paramObj) throws IOException;
+		}
+
+		public static class SimpleLineCollector implements LineReader.LineConsumer<Collection<String>> {
+		
+			public boolean consume(String line, Collection<String> result) throws IOException {
+				result.add(line);
+				return true;
+			}
+		}
+
+		private final File file;
+		private final LogFacility log;
+		private boolean trimLines = true;
+		private boolean skipEmpty = true;
+		private String ignoreThatStarts = null;
+
+		public LineReader(File f, LogFacility logFacility) {
+			file = f;
+			log = logFacility;
+		}
+		
+		/**
+		 * default: <code>true</code>
+		 * <code>false</code> to return line as is
+		 */
+		public LineReader trimLines(boolean trim) {
+			trimLines = trim;
+			return this;
+		}
+		
+		/**
+		 * default: <code>true</code>
+		 * <code>false</code> to pass empty lines to consumer
+		 */
+		public LineReader skipEmpty(boolean skip) {
+			skipEmpty = skip;
+			return this;
+		}
+		
+		/**
+		 * default: doesn't skip any line.
+		 * set e.g. to "#" or "//" to skip lines that start with such prefix
+		 */
+		public LineReader ignoreLineComments(String lineStart) {
+			ignoreThatStarts = lineStart;
+			return this;
+		}
+
+		public <T> void read(LineConsumer<T> consumer, T paramObj) throws HgInvalidFileException {
+			BufferedReader statusFileReader = null;
+			try {
+//				consumer.begin(file, paramObj);
+				statusFileReader = new BufferedReader(new FileReader(file));
+				String line;
+				boolean ok = true;
+				while (ok && (line = statusFileReader.readLine()) != null) {
+					if (trimLines) {
+						line = line.trim();
+					}
+					if (ignoreThatStarts != null && line.startsWith(ignoreThatStarts)) {
+						continue;
+					}
+					if (!skipEmpty || line.length() > 0) {
+						ok = consumer.consume(line, paramObj);
+					}
+				}
+			} catch (IOException ex) {
+				throw new HgInvalidFileException(ex.getMessage(), ex, file);
+			} finally {
+				try {
+					statusFileReader.close();
+				} catch (IOException ex) {
+					log.dump(MqManager.class, Warn, ex, null);
+				}
+//				try {
+//					consumer.end(file, paramObj);
+//				} catch (IOException ex) {
+//					log.warn(MqManager.class, ex, null);
+//				}
+			}
+		}
+	}
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