Bug 179743 Parameter Validate Event is not Called
I have tested the validate event on parameters and it never appears to get called.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
}
	public void setParameterDisplayTexts( Map params )
	{
		Iterator iterator = params.entrySet( ).iterator( );
		while ( iterator.hasNext( ) )
		{
			Map.Entry entry = (Map.Entry) iterator.next( );
			String name = (String) entry.getKey( );
			String text = (String) entry.getValue( );
			setParameterDisplayText( name, text );
		}
	}
	public void setParameterDisplayText( String name, String displayText )
	{
		parameterChanged = true;
		Object parameter = inputValues.get( name );
		if ( parameter != null )
		{
			assert parameter instanceof ParameterAttribute;
			( (ParameterAttribute) parameter ).setDisplayText( displayText );
		}
		else
		{
			inputValues.put( name, new ParameterAttribute( null, displayText ) );
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.IEngineTask#cancel()