FileChannel: added "none" to the PURGE_AGE and PURGE_COUNT

Foundation/include/Poco/FileChannel.h

@@ -140,7 +140,7 @@ class Foundation_API FileChannel: public Channel
 	///   * local:      Rotation strategy is based on local time.
 	///
 	/// Archived log files can be compressed using the gzip compression
-	/// method. Compressing can be controlled with the "compress"
+	/// method. Compressing can be controlled with the "compression"
 	/// property. The following values for the "compress" property
 	/// are supported:
 	///
@@ -154,6 +154,7 @@ class Foundation_API FileChannel: public Channel
 	///
 	/// The purgeAge property can have the following values:
 	///
+	///   * "none" or ""   no purging
 	///   * <n> [seconds]  the maximum age is <n> seconds.
 	///   * <n> minutes:   the maximum age is <n> minutes.
 	///   * <n> hours:     the maximum age is <n> hours.
@@ -161,10 +162,10 @@ class Foundation_API FileChannel: public Channel
 	///   * <n> weeks:     the maximum age is <n> weeks.
 	///   * <n> months:    the maximum age is <n> months, where a month has 30 days.
 	///
-	/// The purgeCount property has an integer value that
-	/// specifies the maximum number of archived log files.
-	/// If the number is exceeded, archived log files are 
-	/// deleted, starting with the oldest.
+	/// The purgeCount property has an integer value that specifies the maximum number
+	/// of archived log files. If the number is exceeded, archived log files are
+	/// deleted, starting with the oldest. When "none" or empty string are
+	/// supplied, they reset purgeCount to none (no purging).
 	///
 	/// For a more lightweight file channel class, see SimpleFileChannel.
 {

Foundation/src/FileChannel.cpp

@@ -302,14 +302,28 @@ void FileChannel::setCompress(const std::string& compress)
 
 void FileChannel::setPurgeAge(const std::string& age)
 {
+	delete _pPurgeStrategy;
+	_pPurgeStrategy = 0;
+	_purgeAge = "none";
+	if (age.empty() || 0 == icompare(age, "none"))
+		return;
+
 	std::string::const_iterator it = age.begin();
 	std::string::const_iterator end = age.end();
+
 	int n = 0;
-	while (it != end && Ascii::isSpace(*it)) ++it;
-	while (it != end && Ascii::isDigit(*it)) { n *= 10; n += *it++ - '0'; }
-	while (it != end && Ascii::isSpace(*it)) ++it;
+	while (it != end && Ascii::isSpace(*it))
+		++it;
+	while (it != end && Ascii::isDigit(*it))
+	{
+		n *= 10;
+		n += *it++ - '0';
+	}
+	while (it != end && Ascii::isSpace(*it))
+		++it;
 	std::string unit;
-	while (it != end && Ascii::isAlpha(*it)) unit += *it++;
+	while (it != end && Ascii::isAlpha(*it))
+		unit += *it++;
 	
 	Timespan::TimeDiff factor = Timespan::SECONDS;
 	if (unit == "minutes")
@@ -321,26 +335,43 @@ void FileChannel::setPurgeAge(const std::string& age)
 	else if (unit == "weeks")
 		factor = 7*Timespan::DAYS;
 	else if (unit == "months")
-		factor = 30*Timespan::DAYS;
+		factor = 30 * Timespan::DAYS;
 	else if (unit != "seconds")
 		throw InvalidArgumentException("purgeAge", age);
 
-	delete _pPurgeStrategy;
-	_pPurgeStrategy = new PurgeByAgeStrategy(Timespan(factor*n));
+	if (0 == n)
+		throw InvalidArgumentException("Zero is not valid purge age.");
+
+	_pPurgeStrategy = new PurgeByAgeStrategy(Timespan(factor * n));
 	_purgeAge = age;
 }
 
 
 void FileChannel::setPurgeCount(const std::string& count)
 {
+	delete _pPurgeStrategy;
+	_pPurgeStrategy = 0;
+	_purgeAge = "none";
+	if (count.empty() || 0 == icompare(count, "none"))
+		return;
+
+	int n = 0;
 	std::string::const_iterator it = count.begin();
 	std::string::const_iterator end = count.end();
-	int n = 0;
-	while (it != end && Ascii::isSpace(*it)) ++it;
-	while (it != end && Ascii::isDigit(*it)) { n *= 10; n += *it++ - '0'; }
-	while (it != end && Ascii::isSpace(*it)) ++it;
 
-	delete _pPurgeStrategy;
+	while (it != end && Ascii::isSpace(*it))
+		++it;
+	while (it != end && Ascii::isDigit(*it))
+	{
+		n *= 10;
+		n += *it++ - '0';
+	}
+	while (it != end && Ascii::isSpace(*it))
+		++it;
+
+	if (0 == n)
+		throw InvalidArgumentException("Zero is not valid purge count.");
+
 	_pPurgeStrategy = new PurgeByCountStrategy(n);
 	_purgeCount = count;
 }

Foundation/testsuite/src/FileChannelTest.h

@@ -75,6 +75,11 @@ private:
         template <class D> std::string rotation(TimeRotation rtype) const;
         void remove(const std::string& baseName);
         std::string filename() const;
+
+        void purgeAge(const std::string& purgeAge);
+        void noPurgeAge(const std::string& purgeAge);
+        void purgeCount(const std::string& pc);
+        void noPurgeCount(const std::string& pc);
 };