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//
// System.Diagnostics.Switch.cs
//
// Comments from John R. Hicks <angryjohn69@nc.rr.com> original implementation
// can be found at: /mcs/docs/apidocs/xml/en/System.Diagnostics
//
// Author:
// John R. Hicks (angryjohn69@nc.rr.com)
// Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2001-2002
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Collections;
namespace System.Diagnostics
{
public abstract class Switch
{
private string name = "";
private string description = "";
private int switchSetting = 0;
// MS Behavior is that (quoting from MSDN for OnSwitchSettingChanged()):
// "...It is invoked the first time a switch reads its value from the
// configuration file..."
// The docs + testing implies two things:
// 1. The value of the switch is not read in from the constructor
// 2. The value is instead read in on the first time get_SwitchSetting is
// invoked
// Assuming that OnSwitchSettingChanged() is invoked on a .config file
// read and on all changes
//
// Thus, we need to keep track of whether or not switchSetting has been
// initialized. Using `switchSetting=-1' seems logical, but if someone
// actually wants to use -1 as a switch value that would cause problems.
private bool initialized = false;
protected Switch(string displayName, string description)
{
this.name = displayName;
this.description = description;
}
public string Description {
get {return description;}
}
public string DisplayName {
get {return name;}
}
protected int SwitchSetting {
get {
if (!initialized) {
initialized = true;
GetConfigFileSetting ();
OnSwitchSettingChanged ();
}
return switchSetting;
}
set {
if(switchSetting != value) {
switchSetting = value;
OnSwitchSettingChanged();
}
initialized = true;
}
}
private void GetConfigFileSetting ()
{
try {
IDictionary d = (IDictionary) DiagnosticsConfiguration.Settings ["switches"];
// Load up the specified switch
if (d != null)
switchSetting = int.Parse (d [name].ToString());
} catch {
switchSetting = 0;
}
}
protected virtual void OnSwitchSettingChanged()
{
// Do nothing. This is merely provided for derived classes to know when
// the value of SwitchSetting has changed.
}
}
}
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