128 lines
4.2 KiB
C#
128 lines
4.2 KiB
C#
#region PDFsharp - A .NET library for processing PDF
|
|
//
|
|
// Authors:
|
|
// Stefan Lange
|
|
//
|
|
// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
|
|
//
|
|
// http://www.pdfsharp.com
|
|
// http://sourceforge.net/projects/pdfsharp
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a
|
|
// copy of this software and associated documentation files (the "Software"),
|
|
// to deal in the Software without restriction, including without limitation
|
|
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
// and/or sell copies of the Software, and to permit persons to whom the
|
|
// Software is furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included
|
|
// in all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
// DEALINGS IN THE SOFTWARE.
|
|
#endregion
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Diagnostics;
|
|
using System.IO;
|
|
using PdfSharp.Pdf.IO;
|
|
|
|
namespace PdfSharp.Pdf.Internal
|
|
{
|
|
/// <summary>
|
|
/// Provides a thread-local cache for large objects.
|
|
/// </summary>
|
|
internal class ThreadLocalStorage // #???
|
|
{
|
|
public ThreadLocalStorage()
|
|
{
|
|
_importedDocuments = new Dictionary<string, PdfDocument.DocumentHandle>(StringComparer.OrdinalIgnoreCase);
|
|
}
|
|
|
|
public void AddDocument(string path, PdfDocument document)
|
|
{
|
|
_importedDocuments.Add(path, document.Handle);
|
|
}
|
|
|
|
public void RemoveDocument(string path)
|
|
{
|
|
_importedDocuments.Remove(path);
|
|
}
|
|
|
|
public PdfDocument GetDocument(string path)
|
|
{
|
|
Debug.Assert(path.StartsWith("*") || Path.IsPathRooted(path), "Path must be full qualified.");
|
|
|
|
PdfDocument document = null;
|
|
PdfDocument.DocumentHandle handle;
|
|
if (_importedDocuments.TryGetValue(path, out handle))
|
|
{
|
|
document = handle.Target;
|
|
if (document == null)
|
|
RemoveDocument(path);
|
|
}
|
|
if (document == null)
|
|
{
|
|
document = PdfReader.Open(path, PdfDocumentOpenMode.Import);
|
|
_importedDocuments.Add(path, document.Handle);
|
|
}
|
|
return document;
|
|
}
|
|
|
|
public PdfDocument[] Documents
|
|
{
|
|
get
|
|
{
|
|
List<PdfDocument> list = new List<PdfDocument>();
|
|
foreach (PdfDocument.DocumentHandle handle in _importedDocuments.Values)
|
|
{
|
|
if (handle.IsAlive)
|
|
list.Add(handle.Target);
|
|
}
|
|
return list.ToArray();
|
|
}
|
|
}
|
|
|
|
public void DetachDocument(PdfDocument.DocumentHandle handle)
|
|
{
|
|
if (handle.IsAlive)
|
|
{
|
|
foreach (string path in _importedDocuments.Keys)
|
|
{
|
|
if (_importedDocuments[path] == handle)
|
|
{
|
|
_importedDocuments.Remove(path);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Clean table
|
|
bool itemRemoved = true;
|
|
while (itemRemoved)
|
|
{
|
|
itemRemoved = false;
|
|
foreach (string path in _importedDocuments.Keys)
|
|
{
|
|
if (!_importedDocuments[path].IsAlive)
|
|
{
|
|
_importedDocuments.Remove(path);
|
|
itemRemoved = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Maps path to document handle.
|
|
/// </summary>
|
|
readonly Dictionary<string, PdfDocument.DocumentHandle> _importedDocuments;
|
|
}
|
|
} |