PackageRelationship.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / System / IO / Packaging / PackageRelationship.cs / 1305600 / PackageRelationship.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//  This is a class for representing a PackageRelationship. This is a part of the 
//  MMCF Packaging Layer.
// 
// History:
//  01/03/2004: SarjanaS: Initial creation.
//  03/17/2004: BruceMac: Initial implementation or PackageRelationship methods
// 
//-----------------------------------------------------------------------------
 
using System; 
using System.Collections;
using System.Xml; 
using System.Windows;           // For Exception strings - SRID
using System.Text;              // for StringBuilder
using System.Diagnostics;       // for Debug.Assert
 
using MS.Internal;              // for Invariant.Assert
using MS.Internal.WindowsBase; 
 
namespace System.IO.Packaging
{ 
    /// 
    /// This class is used to express a relationship between a source and a target part.
    /// The only way to create a PackageRelationship, is to call the PackagePart.CreateRelationship()
    /// or Package.CreateRelationship(). A relationship is owned by a part or by the package itself. 
    /// If the source part is deleted all the relationships it owns are also deleted.
    /// A target of the relationship need not be present.  
    public class PackageRelationship 
    {
        //----------------------------------------------------- 
        //
        //  Public Constructors
        //
        //----------------------------------------------------- 
        // None
        //------------------------------------------------------ 
        // 
        //  Public Properties
        // 
        //-----------------------------------------------------

        #region Public Properties
 
        /// 
        /// This is a reference to the parent PackagePart to which this relationship belongs. 
        ///  
        /// Uri
        public Uri SourceUri 
        {
            get
            {
                if (_source == null) 
                    return PackUriHelper.PackageRootUri;
                else 
                    return _source.Uri; 
            }
        } 

        /// 
        /// Uri of the TargetPart, that this relationship points to.
        ///  
        /// 
        public Uri TargetUri 
        { 
            get
            { 
                return _targetUri;
            }
        }
 
        /// 
        /// Type of the relationship - used to uniquely define the role of the relationship 
        ///  
        /// 
        public string RelationshipType 
        {
            get
            {
                return _relationshipType; 
            }
        } 
 
        /// 
        /// Enumeration value indicating the interpretations of the "base" of the target uri. 
        /// 
        /// 
        public TargetMode TargetMode
        { 
            get
            { 
                return _targetMode; 
            }
        } 

        /// 
        /// PackageRelationship's identifier. Unique across relationships for the given source.
        ///  
        /// String
        public String Id 
        { 
            get
            { 
                return _id;
            }
        }
 

        ///  
        /// PackageRelationship's owning Package object. 
        /// 
        /// Package 
        public Package Package
        {
            get
            { 
                return _package;
            } 
        } 

        #endregion Public Properties 

        //------------------------------------------------------
        //
        //  Public Methods 
        //
        //------------------------------------------------------ 
        // None 
        //-----------------------------------------------------
        // 
        //  Public Events
        //
        //------------------------------------------------------
        // None 
        //-----------------------------------------------------
        // 
        //  Internal Constructors 
        //
        //----------------------------------------------------- 

        #region Internal Constructor

        ///  
        /// PackageRelationship constructor
        ///  
        /// Owning Package object for this relationship 
        /// owning part - will be null if the owner is the container
        /// target of relationship 
        /// enum specifying the interpretation of the base uri for the target uri
        /// type name
        /// unique identifier
        internal PackageRelationship(Package package, PackagePart sourcePart, Uri targetUri, TargetMode targetMode,  string relationshipType, string id) 
        {
            //sourcePart can be null to represent that the relationships are at the package level 
 
            if (package == null)
                throw new ArgumentNullException("package"); 

            if (targetUri == null)
                throw new ArgumentNullException("targetUri");
 
            if (relationshipType == null)
                throw new ArgumentNullException("relationshipType"); 
 
            if (id == null)
                throw new ArgumentNullException("id"); 
            // The ID is guaranteed to be an XML ID by the caller (InternalRelationshipCollection).
            // The following check is a precaution against future bug introductions.
#if DEBUG
            try 
            {
                // An XSD ID is an NCName that is unique. We can't check uniqueness at this level. 
                XmlConvert.VerifyNCName(id); 
            }
            catch(XmlException exception) 
            {
                throw new XmlException(SR.Get(SRID.NotAValidXmlIdString, id), exception);
            }
#endif 

            // Additional check - don't accept absolute Uri's if targetMode is Internal. 
            Debug.Assert((targetMode == TargetMode.External || !targetUri.IsAbsoluteUri), 
                "PackageRelationship target must be relative if the TargetMode is Internal");
 
            // Additional check - Verify if the Enum value is valid
            Debug.Assert ((targetMode >= TargetMode.Internal || targetMode <= TargetMode.External),
                "TargetMode enum value is out of Range");
 
            // Look for empty string or string with just spaces
            Debug.Assert(relationshipType.Trim() != String.Empty, 
                "RelationshipType cannot be empty string or a string with just spaces"); 

            _package            = package; 
            _source             = sourcePart;
            _targetUri          = targetUri;
            _relationshipType   = relationshipType;
            _targetMode         = targetMode; 
            _id                 = id;
        } 
 
        #endregion Internal Constructor
 
        //-----------------------------------------------------
        //
        //  Internal Properties
        // 
        //------------------------------------------------------
 
        #region Internal Properties 

        internal static Uri ContainerRelationshipPartName 
        {
            get
            {
                return _containerRelationshipPartName; 
            }
        } 
 
        // Property used in streaming production to be able to keep the set
        // of all properties that have been created in memory while knowing 
        // which remain to be written to XML.
        internal bool Saved
        {
            get 
            {
                return _saved; 
            } 
            set
            { 
                _saved = value;
            }
        }
 
        #endregion Internal Properties
 
        //----------------------------------------------------- 
        //
        //  Internal Methods 
        //
        //------------------------------------------------------
        // None
        //------------------------------------------------------ 
        //
        //  Internal Events 
        // 
        //-----------------------------------------------------
        // None 
        //------------------------------------------------------
        //
        //  Private Methods
        // 
        //-----------------------------------------------------
        // None 
        //----------------------------------------------------- 
        //
        //  Private Fields 
        //
        //-----------------------------------------------------

        #region Private Members 

        private Package         _package; 
        private PackagePart     _source; 
        private Uri             _targetUri;
        private string          _relationshipType; 
        private TargetMode      _targetMode;
        private String          _id;
        private bool            _saved = false;
 
        private static readonly Uri    _containerRelationshipPartName = PackUriHelper.CreatePartUri(new Uri("/_rels/.rels", UriKind.Relative));
 
        #endregion Private Members 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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PackageRelationship.cs source code in C# .NET

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