using System;
using System.Xml;

namespace PDFPatcher.Processor
{
	sealed class ConvertUnitProcessor : IInfoDocProcessor
	{
		public float UnitFactor { get; set; }

		public ConvertUnitProcessor() {
			UnitFactor = 1;
		}

		#region IInfoDocProcessor 成员

		public bool Process(XmlElement item) {
			ConvertUnit(item, Constants.Coordinates.Bottom);
			ConvertUnit(item, Constants.Coordinates.Left);
			ConvertUnit(item, Constants.Coordinates.Right);
			ConvertUnit(item, Constants.Coordinates.Top);
			return true;
		}

		#endregion

		bool ConvertUnit(XmlElement item, string attribute) {
			var a = item.GetAttributeNode(attribute);
			if (a != null) {
				a.Value = Common.UnitConverter.ToPoint(a.Value, UnitFactor);
				return true;
			}
			return false;
		}
	}
}