/// <summary>
/// Parse the <b>RuleSet</b> definitions in the configuration file
/// indicated by the URI.
/// </summary>
/// <param name="uri">The URI of the business rule configuration file.</param>
private static void ParseRuleSets(string uri)
{
RuleSet ruleSet = null;
XmlReader reader = XmlReader.Create(uri);
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
{
if (reader.LocalName.Equals("forceLoad"))
{
string platform = reader ["platform"];
string implementation = reader ["class"];
if (platform.Equals(".Net"))
{
try {
Type type = Type.GetType(implementation);
if (type != null)
{
// Access each member to ensure it has a chance to initialise
MemberInfo [] members = type.GetMembers();
if (members != null)
{
foreach (MemberInfo member in members)
{
if (member.MemberType == MemberTypes.Field)
{
type.InvokeMember(member.Name, BindingFlags.GetField, null, null, null);
}
}
}
break;
}
else
{
logger.Error("Could not find load rule class '" + implementation + "'");
}
}
catch (Exception error) {
logger.Error("Could not force load rule class '" + implementation + "'", error);
}
}
}
else if (reader.LocalName.Equals("ruleSet"))
{
string name = reader ["name"];
ruleSet = new RuleSet(name);
}
else if (reader.LocalName.Equals("addRule"))
{
string name = reader ["name"];
Rule rule = Rule.ForName(name);
if (rule != null)
{
if (ruleSet != null)
{
ruleSet.Add(rule);
}
else
{
logger.Error("Syntax error in rule file - addRule outside of RuleSet");
}
}
else
{
logger.Error("Reference to undefined rule '" + name + "' in addRule");
}
}
else if (reader.LocalName.Equals("removeRule"))
{
string name = reader ["name"];
Rule rule = Rule.ForName(name);
if (rule != null)
{
if (ruleSet != null)
{
ruleSet.Remove(rule);
}
else
{
logger.Error("Syntax error in rule file - removeRule outside of RuleSet");
}
}
else
{
logger.Error("Reference to undefined rule '" + name + "' in addRule");
}
}
else if (reader.LocalName.Equals("addRuleSet"))
{
string name = reader ["name"];
RuleSet rules = ForName(name);
if (rules != null)
{
if (ruleSet != null)
{
if (rules != ruleSet)
{
ruleSet.Add(rules);
}
else
{
logger.Error("Attempt to recursively define ruleset '" + name + "'");
}
}
else
{
logger.Error("Syntax error in rule file - addRuleSet outside of RuleSet");
}
}
else
{
logger.Error("Reference to undefined rule '" + name + "' in addRule");
}
}
break;
}
case XmlNodeType.EndElement:
{
if (reader.LocalName.Equals("ruleSet"))
{
ruleSet = null;
}
break;
}
}
}
reader.Close();
}
/// <summary>
/// Attempts to remove a given <see cref="Rule"/> from the collection
/// held by the <B>RuleSet</B>.
/// </summary>
/// <param name="rule">The <see cref="Rule"/> to be removed.</param>
/// <returns> The <see cref="Rule"/> instance removed from the set or
/// <c>null</c> if there was no match.</returns>
public Rule Remove(Rule rule)
{
return(Remove(rule.Name));
}
/// <summary>
/// Attempts to remove a given <see cref="Rule"/> from the collection
/// held by the <B>RuleSet</B>.
/// </summary>
/// <param name="rule">The <see cref="Rule"/> to be removed.</param>
/// <returns> The <see cref="Rule"/> instance removed from the set or
/// <c>null</c> if there was no match.</returns>
public Rule Remove(Rule rule)
{
return (Remove (rule.Name));
}
/// <summary>
/// Adds the indicated <see cref="Rule"/> instance to the <B>RuleSet</B>
/// A <see cref="Rule"/> may be referenced by several <B>RuleSet</B>
/// instances simultaneously.
/// <para>If the <see cref="Rule"/> has the same name as a previously
/// added one then it will replace it. This feature can be used to
/// overwrite standard rules with customized ones.</para>
/// </summary>
/// <param name="rule">The <see cref="Rule"/> to be added.</param>
public void Add(Rule rule)
{
rules [rule.Name] = rule;
}
/// <summary>
/// Adds the indicated <see cref="Rule"/> instance to the <B>RuleSet</B>
/// A <see cref="Rule"/> may be referenced by several <B>RuleSet</B>
/// instances simultaneously.
/// <para>If the <see cref="Rule"/> has the same name as a previously
/// added one then it will replace it. This feature can be used to
/// overwrite standard rules with customized ones.</para>
/// </summary>
/// <param name="rule">The <see cref="Rule"/> to be added.</param>
public void Add(Rule rule)
{
rules [rule.Name] = rule;
}
