/
XmlConfigurationReader.cs
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/
XmlConfigurationReader.cs
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// --------------------------------------------------------------------------
// Copyright (c) 2014 Will Perry, Microsoft
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// --------------------------------------------------------------------------
namespace WillPe.Utils
{
using System;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Xml;
public abstract class XmlConfigurationReader<T>
{
protected delegate bool ParseFunc<TOut>(string value, out TOut result);
public T Load(string path)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
if (!Path.IsPathRooted(path))
{
var homeDirectory = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
if (string.IsNullOrEmpty(homeDirectory))
{
throw new IOException("Cannot determine full path for '" + path + "'");
}
path = Path.Combine(homeDirectory, path);
}
var xmlDocument = new XmlDocument();
xmlDocument.Load(path);
return this.Load(xmlDocument, path);
}
public T Parse(string xml)
{
if (string.IsNullOrEmpty(xml))
{
throw new ArgumentNullException("xml");
}
var xmlDocument = new XmlDocument();
xmlDocument.LoadXml(xml);
return this.Load(xmlDocument);
}
protected abstract T Load(XmlDocument xmlDocument, string sourceFile = null);
protected TOut TryGetAttributeValue<TOut>(XmlElement element, string name, ParseFunc<TOut> tryParse, TOut defaultValue = default(TOut))
{
TOut result;
var attrValue = element.GetAttribute(name);
if (!string.IsNullOrEmpty(attrValue) && tryParse(attrValue, out result))
{
return result;
}
return defaultValue;
}
protected bool TryParseDateTimeRangeArray(string value, out DateTimeRange[] result)
{
string[] values;
if (this.TryParseStringArray(value, out values))
{
result = new DateTimeRange[values.Length];
for (var i = 0; i < values.Length; i++)
{
if (!DateTimeRange.TryParse(values[i], out result[i]))
{
return false;
}
}
return true;
}
result = new DateTimeRange[0];
return false;
}
protected bool TryParseStringArray(string value, out string[] result)
{
if (string.IsNullOrEmpty(value))
{
result = null;
return false;
}
if (value.Contains(","))
{
result = value.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
.Select(s => s.Trim())
.ToArray();
return true;
}
result = new[] { value.Trim() };
return true;
}
}
}