112 lines
3.2 KiB
C#
112 lines
3.2 KiB
C#
using System;
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using System.Reflection;
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using System.Collections;
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using System.Collections.Generic;
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using System.Xml;
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using oodb.mapping;
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using System.IO;
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using System.Reflection.Emit;
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using System.Linq;
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namespace oodb.index
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{
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public abstract class Index
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{
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public OODB OODB { get; }
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public FieldInfo FieldInfo { get; }
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public String FileName { get; }
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public FlatTypeMapping ValueMapping { get; }
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public FlatTypeMapping StorageMapping { get; protected set; }
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public Index(OODB oodb, FieldInfo fieldInfo)
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{
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OODB = oodb;
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FieldInfo = fieldInfo;
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ValueMapping = OODB.GetFlatTypeMapping(fieldInfo.FieldType);
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StorageMapping = ValueMapping;
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FileName = Path.Combine(
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OODB.StorageAdapter.GetTypeStorage(FieldInfo.DeclaringType).Directory.FullName,
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String.Format("index_{0}_{1}_{2}.xml", GetType().Name, FieldInfo.DeclaringType.Name, FieldInfo.Name)
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);
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OODB.StorageAdapter.GetTypeStorage(fieldInfo.DeclaringType).AddIndex(this);
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Prepare();
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Load();
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}
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protected abstract void Prepare();
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public abstract IEnumerable<KeyValuePair<Guid, object>> RetrieveIndexValues();
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public abstract void RestoreIndexValues(IEnumerable<KeyValuePair<Guid, object>> indexValues);
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public abstract void Add(Persistent persistent);
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public abstract void Remove(Guid persistenceID);
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public void Remove(Persistent persistent)
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{
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Remove(persistent.PersistenceID);
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}
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public abstract IEnumerable<Guid> Query();
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public void Load()
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{
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if (File.Exists(FileName))
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{
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XmlDocument xmlDocument = new XmlDocument();
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xmlDocument.Load(FileName);
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RestoreIndexValues(
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xmlDocument.SelectNodes("/Index/Entry").Cast<XmlElement>().Select((entry) => new KeyValuePair<Guid, object>(Guid.Parse(entry.GetAttribute("PersistenceID")), StorageMapping.FromXml(entry.SelectSingleNode("Value") as XmlElement)))
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);
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}
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}
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public void Save()
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{
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XmlDocument xmlDocument = new XmlDocument();
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XmlElement indexElement = xmlDocument.CreateElement("Index");
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indexElement.SetAttribute("Type", GetType().FullName);
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xmlDocument.AppendChild(indexElement);
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foreach (KeyValuePair<Guid,object> entry in RetrieveIndexValues())
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{
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XmlElement xmlEntry = xmlDocument.CreateElement("Entry");
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xmlEntry.SetAttribute("PersistenceID", entry.Key.ToString());
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xmlEntry.AppendChild(StorageMapping.ToXml(xmlDocument, entry.Value));
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indexElement.AppendChild(xmlEntry);
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}
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xmlDocument.Save(FileName);
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}
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public override int GetHashCode()
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{
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return FileName.GetHashCode();
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}
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public override bool Equals(object obj)
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{
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if (obj is Index)
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{
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Index other = obj as Index;
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return FileName.Equals(other.FileName);
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}
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return false;
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}
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}
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}
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