NVelocity/App/Events/EventCartridge.cs

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namespace NVelocity.App.Events
{
	using System;
	using System.Collections;
	using Context;
	using Exception;

	/// <summary>
	/// 'Package' of event handlers...
	/// </summary>
	public class EventCartridge
	{
		public event ReferenceInsertionEventHandler ReferenceInsertion;
		public event NullSetEventHandler NullSet;
		public event MethodExceptionEventHandler MethodExceptionEvent;

		/// <summary>
		/// Called during Velocity merge before a reference value will
		/// be inserted into the output stream.
		/// </summary>
		/// <param name="referenceStack">the stack of objects used to reach this reference</param>
		/// <param name="reference">reference from template about to be inserted</param>
		/// <param name="value"> value about to be inserted (after toString() )</param>
		/// <returns>
		/// Object on which toString() should be called for output.
		/// </returns>
		internal Object ReferenceInsert(Stack referenceStack, String reference, Object value)
		{
			if (ReferenceInsertion != null)
			{
				ReferenceInsertionEventArgs args = new ReferenceInsertionEventArgs(referenceStack, reference, value);
				ReferenceInsertion(this, args);
				value = args.NewValue;
			}

			return value;
		}

		/// <summary>
		/// Called during Velocity merge to determine if when
		/// a #set() results in a null assignment, a warning
		/// is logged.
		/// </summary>
		/// <returns>true if to be logged, false otherwise</returns>
		internal bool ShouldLogOnNullSet(String lhs, String rhs)
		{
			if (NullSet == null)
				return true;

			NullSetEventArgs e = new NullSetEventArgs(lhs, rhs);
			NullSet(this, e);

			return e.ShouldLog;
		}

		/// <summary>
		/// Called during Velocity merge if a reference is null
		/// </summary>
		/// <param name="claz">Class that is causing the exception</param>
		/// <param name="method">method called that causes the exception</param>