338 lines
9.5 KiB
C#
338 lines
9.5 KiB
C#
//
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// Authors:
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// Marek Habersack (mhabersack@novell.com)
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//
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// (C) 2007 Novell, Inc
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.Xml;
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using System.Xml.XPath;
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namespace Mono.MonoConfig
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{
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class HandlerDescription
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{
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Type handlerType;
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Type handlerStorageType;
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string section;
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object handler;
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object storage;
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public object Handler {
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get {
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if (handler != null)
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return handler;
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handler = Activator.CreateInstance (handlerType);
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return handler;
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}
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}
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public object Storage {
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get {
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if (storage != null)
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return storage;
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storage = Activator.CreateInstance (handlerStorageType);
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return storage;
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}
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}
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public string Section {
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get { return section; }
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}
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public bool Implements (string interfaceName)
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{
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return handlerType.GetInterface (interfaceName) != null;
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}
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public HandlerDescription (string handlerTypeName, string handlerStorageTypeName, string section)
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{
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handlerType = Type.GetType (handlerTypeName, true);
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if (handlerType.GetInterface ("Mono.MonoConfig.IDocumentNodeHandler") == null)
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throw new ApplicationException (
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String.Format ("Handler for section '{0}' must implement the '{1}' interface",
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section, typeof (Mono.MonoConfig.IDocumentNodeHandler)));
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handlerStorageType = Type.GetType (handlerStorageTypeName, true);
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this.section = section;
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}
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}
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public class Configuration
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{
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string[] configs;
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Dictionary <string, HandlerDescription> section_handlers;
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List <HandlerDescription> section_handlers_ordered;
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List <XPathDocument> config_documents;
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bool loaded;
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public Configuration () : this (null)
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{}
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public Configuration (string[] configs)
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{
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this.configs = configs;
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section_handlers = new Dictionary <string, HandlerDescription> ();
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section_handlers_ordered = new List <HandlerDescription> ();
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config_documents = new List <XPathDocument> (configs != null ? configs.Length : 1);
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}
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public void WriteDefaultConfigFile (string name, string path, FeatureTarget target)
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{
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AssertLoaded ();
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if (String.IsNullOrEmpty (name))
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throw new ArgumentException ("name", "Must not be null or empty");
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IDefaultConfigFileContainer[] containers = GetHandlersForInterface <IDefaultConfigFileContainer> ();
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if (containers == null || containers.Length == 0)
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throw new ApplicationException ("Cannot find any handler for writing default config files");
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IDefaultContainer[] defaults = GetHandlersForInterface <IDefaultContainer> ();
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bool written = false;
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foreach (IDefaultConfigFileContainer container in containers) {
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if (container.HasDefaultConfigFile (name, target)) {
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container.WriteDefaultConfigFile (name, target, path, defaults);
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written = true;
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break;
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}
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}
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if (!written)
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throw new ApplicationException (
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String.Format ("Definition of default config file '{0}' for target '{1}' not found.",
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name, target));
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}
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public string[] DefaultConfigFiles {
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get {
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AssertLoaded ();
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IDefaultConfigFileContainer[] containers = GetHandlersForInterface <IDefaultConfigFileContainer> ();
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if (containers == null || containers.Length == 0)
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return null;
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List <string> defaults = new List <string> ();
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foreach (IDefaultConfigFileContainer container in containers)
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defaults.AddRange (container.DefaultConfigFiles);
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defaults.Sort ();
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return defaults.ToArray ();
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}
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}
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public void AddFeature (string configFilePath, FeatureTarget target, string featureName)
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{
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AssertLoaded ();
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if (String.IsNullOrEmpty (configFilePath))
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throw new ArgumentException ("configFilePath", "Must not be null or empty");
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if (String.IsNullOrEmpty (featureName))
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throw new ArgumentException ("featureName", "Must not be null or empty");
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IFeatureGenerator[] generators = GetHandlersForInterface <IFeatureGenerator> ();
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if (generators == null || generators.Length == 0)
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throw new ApplicationException ("Cannot find any feature generator");
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IDefaultContainer[] defaults = GetHandlersForInterface <IDefaultContainer> ();
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IConfigBlockContainer[] configBlocks = GetHandlersForInterface <IConfigBlockContainer> ();
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bool added = false;
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foreach (IFeatureGenerator generator in generators) {
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if (generator.HasFeature (featureName)) {
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generator.AddFeature (configFilePath, featureName, target, defaults, configBlocks);
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added = true;
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break;
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}
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}
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if (!added)
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throw new ApplicationException (
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String.Format ("Definition of feature '{0}' for target '{1}' not found.",
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featureName, target));
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}
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public string[] Features {
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get {
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AssertLoaded ();
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IFeatureGenerator[] generators = GetHandlersForInterface <IFeatureGenerator> ();
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if (generators == null || generators.Length == 0)
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return null;
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List <string> features = new List <string> ();
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foreach (IFeatureGenerator generator in generators)
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features.AddRange (generator.Features);
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features.Sort ();
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return features.ToArray ();
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}
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}
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public void Load (string[] configs)
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{
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this.configs = configs;
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Load ();
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}
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public void Load ()
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{
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if (configs == null || configs.Length == 0)
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return;
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if (loaded) {
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section_handlers.Clear ();
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section_handlers_ordered.Clear ();
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config_documents.Clear ();
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loaded = false;
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}
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XPathDocument doc;
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foreach (string config in configs) {
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if (String.IsNullOrEmpty (config))
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continue;
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try {
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doc = new XPathDocument (config);
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config_documents.Add (doc);
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} catch (XmlException ex) {
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throw new ApplicationException (
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String.Format ("Failed to parse config file '{0}'.", config),
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ex);
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} catch (Exception) {
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continue;
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}
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}
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XPathNavigator nav;
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XPathNodeIterator iter;
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// First configure section handlers
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List <HandlerDescription> handlers_from_file = new List <HandlerDescription> ();
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foreach (XPathDocument xpdoc in config_documents) {
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handlers_from_file.Clear ();
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nav = xpdoc.CreateNavigator ();
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iter = nav.Select ("//mconfig/configuration/handlers/handler[string-length (@section) > 0]");
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while (iter.MoveNext ())
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AddSectionHandler (iter.Current, handlers_from_file);
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section_handlers_ordered.InsertRange (0, handlers_from_file);
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}
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// Process all configs looking for all sections with known handlers
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foreach (XPathDocument xpdoc in config_documents) {
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nav = xpdoc.CreateNavigator ();
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iter = nav.Select ("//mconfig/*");
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while (iter.MoveNext ())
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HandleTopLevelNode (iter.Current);
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}
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loaded = true;
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}
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public T[] GetHandlersForInterface <T> ()
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{
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AssertLoaded ();
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string typeName = typeof (T).ToString ();
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object handler;
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List <T> handlers = null;
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foreach (HandlerDescription hd in section_handlers_ordered) {
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if (hd.Implements (typeName)) {
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if (handlers == null)
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handlers = new List <T> (1);
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handler = hd.Handler;
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if (handler is IStorageConsumer)
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((IStorageConsumer) handler).SetStorage (hd.Storage);
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handlers.Add ((T)handler);
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}
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}
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if (handlers == null)
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return null;
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return handlers.ToArray ();
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}
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void HandleTopLevelNode (XPathNavigator nav)
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{
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string section = nav.LocalName;
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if (!section_handlers.ContainsKey (section))
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return;
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HandlerDescription hd = section_handlers [section];
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if (hd == null)
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return;
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IDocumentNodeHandler handler = hd.Handler as IDocumentNodeHandler;
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object storage = hd.Storage;
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if (handler == null || storage == null)
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return;
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if (handler is IStorageConsumer)
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((IStorageConsumer) handler).SetStorage (storage);
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handler.ReadConfiguration (nav);
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handler.StoreConfiguration ();
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}
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void AddSectionHandler (XPathNavigator nav, List <HandlerDescription> handlers)
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{
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string section = Helpers.GetRequiredNonEmptyAttribute (nav, "section");
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HandlerDescription hd = new HandlerDescription (Helpers.GetRequiredNonEmptyAttribute (nav, "type"),
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Helpers.GetRequiredNonEmptyAttribute (nav, "storageType"),
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section);
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if (section_handlers.ContainsKey (section)) {
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HandlerDescription old = section_handlers [section];
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section_handlers [section] = hd;
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handlers.Remove (old);
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handlers.Add (hd);
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} else {
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section_handlers.Add (section, hd);
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handlers.Add (hd);
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}
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}
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void AssertLoaded ()
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{
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if (!loaded)
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throw new ApplicationException ("Configuration not loaded yet");
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}
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}
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}
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