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// Copyright © Microsoft Corporation.
// This source file is subject to the Microsoft Permissive License.
// See http://www.microsoft.com/resources/sharedsource/licensingbasics/sharedsourcelicenses.mspx.
// All other rights reserved.
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Diagnostics;
using System.Xml;
using System.Xml.XPath;
namespace Microsoft.Ddue.Tools {
public class SwitchComponent : BuildComponent {
public SwitchComponent(BuildAssembler assembler, XPathNavigator configuration) : base(assembler, configuration) {
// get the condition
XPathNavigator condition_element = configuration.SelectSingleNode("switch");
if (condition_element == null) {
throw new ConfigurationErrorsException("You must specifiy a condition using the <switch> statement with a 'value' attribute.");
}
string condition_value = condition_element.GetAttribute("value", String.Empty);
if (String.IsNullOrEmpty(condition_value)) {
throw new ConfigurationErrorsException("The switch statement must have a 'value' attribute, which is an xpath expression.");
}
condition = XPathExpression.Compile(condition_value);
// load the component stacks for each case
XPathNodeIterator case_elements = configuration.Select("case");
foreach (XPathNavigator case_element in case_elements) {
string case_value = case_element.GetAttribute("value", String.Empty);
BuildComponent[] components = BuildAssembler.LoadComponents(case_element);
cases.Add(case_value, components);
}
}
// data held by the component
private XPathExpression condition;
private Dictionary<string,IEnumerable<BuildComponent>> cases = new Dictionary<string,IEnumerable<BuildComponent>>();
// the action of the component
public override void Apply(XmlDocument document, string key) {
// evaluate the condition
string result = document.CreateNavigator().Evaluate(condition).ToString();
// get the corresponding component stack
IEnumerable<BuildComponent> components;
if (cases.TryGetValue(result, out components)) {
// apply it
foreach (BuildComponent component in components) {
component.Apply(document, key);
}
} else {
// no such case exists
}
}
protected override void Dispose(bool disposing) {
if (disposing) {
foreach (IEnumerable<BuildComponent> components in cases.Values) {
foreach (BuildComponent component in components) {
component.Dispose();
}
}
}
base.Dispose(disposing);
}
}
}
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