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#region PDFsharp - A .NET library for processing PDF
//
// Authors:
// Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (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.Diagnostics;
using System.Collections;
using System.Text;
using System.IO;
using PdfSharp.Pdf.Advanced;
using PdfSharp.Drawing;
using PdfSharp.Fonts.TrueType;
using PdfSharp.Internal;
namespace PdfSharp.Pdf.Advanced
{
/// <summary>
/// Represents the imported objects of an external document. Used to cache objects that are
/// already imported when a PdfFormXObject is added to a page.
/// </summary>
internal sealed class PdfImportedObjectTable
{
/// <summary>
/// Initializes a new instance of this class with the document the objects are imported from.
/// </summary>
public PdfImportedObjectTable(PdfDocument owner, PdfDocument externalDocument)
{
if (owner == null)
throw new ArgumentNullException("owner");
if (externalDocument == null)
throw new ArgumentNullException("externalDocument");
this.owner = owner;
this.externalDocumentHandle = externalDocument.Handle;
this.xObjects = new PdfFormXObject[externalDocument.PageCount];
}
PdfFormXObject[] xObjects;
/// <summary>
/// Gets the document this table belongs to.
/// </summary>
public PdfDocument Owner
{
get { return this.owner; }
}
PdfDocument owner;
/// <summary>
/// Gets the external document, or null, if the external document is garbage collected.
/// </summary>
public PdfDocument ExternalDocument
{
get
{
if (this.externalDocumentHandle.IsAlive)
return this.externalDocumentHandle.Target;
return null;
}
}
PdfDocument.DocumentHandle externalDocumentHandle;
public PdfFormXObject GetXObject(int pageNumber)
{
return this.xObjects[pageNumber - 1];
}
public void SetXObject(int pageNumber, PdfFormXObject xObject)
{
this.xObjects[pageNumber - 1] = xObject;
}
/// <summary>
/// Indicates whether the specified object is already imported.
/// </summary>
public bool Contains(PdfObjectID externalID)
{
return this.externalIDs.Contains(externalID.ToString());
}
/// <summary>
/// Adds a cloned object to this table.
/// </summary>
/// <param name="externalID">The object identifier in the forein object.</param>
/// <param name="iref">The cross reference to the clone of the forein object, which belongs to
/// this document. In general the clone has a different object identifier.</param>
public void Add(PdfObjectID externalID, PdfReference iref)
{
this.externalIDs[externalID.ToString()] = iref;
}
/// <summary>
/// Gets the cloned object that corresponds to the specified external identifier.
/// </summary>
public PdfReference this[PdfObjectID externalID]
{
get { return (PdfReference)this.externalIDs[externalID.ToString()]; }
}
/// <summary>
/// Maps external object identifiers to cross reference entries of the importing document
/// {PdfObjectID -> PdfReference}.
/// </summary>
Hashtable externalIDs = new Hashtable();
}
}
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