PackageRelationshipSelector.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / System / IO / Packaging / PackageRelationshipSelector.cs / 1305600 / PackageRelationshipSelector.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//  This class represents a PackageRelationshipSelector. 
//
// History: 
//  07/27/2005: SarjanaS: Initial creation.
//
//-----------------------------------------------------------------------------
 
using System;
using System.Collections.Generic; 
using System.Diagnostics;                  // for Debug.Assert 
using MS.Internal.IO.Packaging;
using System.Windows;                      // For Exception strings - SRID 

namespace System.IO.Packaging
{
    ///  
    /// This class is used to represent a PackageRelationship selector. PackageRelationships can be
    /// selected based on their Type or ID. This class will specify what the selection is based on and 
    /// what the actual criteria is.  
    public sealed class PackageRelationshipSelector
    { 
        //-----------------------------------------------------
        //
        //  Public Constructors
        // 
        //-----------------------------------------------------
 
        #region Public Constructor 

        ///  
        /// Constructor
        /// 
        /// Source Uri of the PackagePart or PackageRoot ("/") that owns the relationship
        /// PackageRelationshipSelectorType enum representing the type of the selectionCriteria 
        /// The actual string that is used to select the relationships
        /// If sourceUri is null 
        /// If selectionCriteria is null 
        /// If selectorType Enumeration does not have a valid value
        /// If PackageRelationshipSelectorType.Id and selection criteria is not valid Xsd Id 
        /// If PackageRelationshipSelectorType.Type and selection criteria is not valid relationship type
        /// If sourceUri is not "/" to indicate the PackageRoot, then it must conform to the
        /// valid PartUri syntax
        public PackageRelationshipSelector(Uri sourceUri, PackageRelationshipSelectorType selectorType, string selectionCriteria) 
        {
            if (sourceUri == null) 
                throw new ArgumentNullException("sourceUri"); 

            if (selectionCriteria == null) 
                throw new ArgumentNullException("selectionCriteria");

            //If the sourceUri is not equal to "/", it must be a valid part name.
            if(Uri.Compare(sourceUri,PackUriHelper.PackageRootUri, UriComponents.SerializationInfoString, UriFormat.UriEscaped, StringComparison.Ordinal) != 0) 
                sourceUri = PackUriHelper.ValidatePartUri(sourceUri);
 
            //selectionCriteria is tested here as per the value of the selectorType. 
            //If selectionCriteria is empty string we will throw the appropriate error message.
            if(selectorType == PackageRelationshipSelectorType.Type) 
                InternalRelationshipCollection.ThrowIfInvalidRelationshipType(selectionCriteria);
            else
            if (selectorType == PackageRelationshipSelectorType.Id)
                InternalRelationshipCollection.ThrowIfInvalidXsdId(selectionCriteria); 
            else
                throw new ArgumentOutOfRangeException("selectorType"); 
 
            _sourceUri = sourceUri;
            _selectionCriteria = selectionCriteria; 
            _selectorType = selectorType;
        }

        #endregion Public Constructor 
        //------------------------------------------------------
        // 
        //  Public Properties 
        //
        //----------------------------------------------------- 

        #region Public Properties

        ///  
        /// This is a uri to the parent PackagePart to which this relationship belongs.
        ///  
        /// PackagePart 
        public Uri SourceUri
        { 
            get
            {
                return _sourceUri;
            } 
        }
 
 
         /// 
        /// Enumeration value indicating the interpretations of the SelectionCriteria. 
        /// 
        /// 
        public PackageRelationshipSelectorType SelectorType
        { 
            get
            { 
                return _selectorType; 
            }
        } 


        /// 
        /// Selection Criteria - actual value (could be ID or type) on which the selection is based 
        /// 
        ///  
        public string SelectionCriteria 
        {
            get 
            {
                return _selectionCriteria;
            }
        } 

 
        #endregion Public Properties 

        //------------------------------------------------------ 
        //
        //  Public Methods
        //
        //------------------------------------------------------ 

        #region Public Methods 
 
        /// 
        /// This method returns the list of selected PackageRelationships as per the 
        /// given criteria, from a part in the Package provided
        /// 
        /// Package object from which we get the relationsips
        ///  
        /// If package parameter is null
        public List Select(Package package) 
        { 
            if(package == null)
            { 
                throw new ArgumentNullException("package");
            }

            List relationships = new List(0); 

            switch (SelectorType) 
            { 
                case PackageRelationshipSelectorType.Id:
                    if (SourceUri.Equals(PackUriHelper.PackageRootUri)) 
                    {
                        if (package.RelationshipExists(SelectionCriteria))
                            relationships.Add(package.GetRelationship(SelectionCriteria));
                    } 
                    else
                    { 
                        if (package.PartExists(SourceUri)) 
                        {
                            PackagePart part = package.GetPart(SourceUri); 
                            if (part.RelationshipExists(SelectionCriteria))
                                relationships.Add(part.GetRelationship(SelectionCriteria));
                        }
                    } 
                    break;
 
                case PackageRelationshipSelectorType.Type: 
                    if (SourceUri.Equals(PackUriHelper.PackageRootUri))
                    { 
                        foreach (PackageRelationship r in package.GetRelationshipsByType(SelectionCriteria))
                            relationships.Add(r);
                    }
                    else 
                    {
                        if (package.PartExists(SourceUri)) 
                        { 
                            foreach (PackageRelationship r in package.GetPart(SourceUri).GetRelationshipsByType(SelectionCriteria))
                                relationships.Add(r); 
                        }
                    }
                    break;
 
                default:
                    //Debug.Assert is fine here since the parameters have already been validated. And all the properties are 
                    //readonly 
                    Debug.Assert(false, "This option should never be called");
                    break; 
            }

            return relationships;
        } 

        #endregion Public Methods 
 
        //-----------------------------------------------------
        // 
        //  Public Events
        //
        //------------------------------------------------------
        // None 
        //-----------------------------------------------------
        // 
        //  Internal Constructors 
        //
        //----------------------------------------------------- 
        // None
        //-----------------------------------------------------
        //
        //  Internal Properties 
        //
        //------------------------------------------------------ 
        // None 
        //-----------------------------------------------------
        // 
        //  Internal Methods
        //
        //------------------------------------------------------
        // None 
        //------------------------------------------------------
        // 
        //  Internal Events 
        //
        //----------------------------------------------------- 
        // None
        //------------------------------------------------------
        //
        //  Private Methods 
        //
        //----------------------------------------------------- 
        // None 
        //-----------------------------------------------------
        // 
        //  Private Fields
        //
        //-----------------------------------------------------
 
        #region Private Members
 
        private Uri                                 _sourceUri; 
        private string                              _selectionCriteria;
        private PackageRelationshipSelectorType     _selectorType; 

        #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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PackageRelationshipSelector.cs source code in C# .NET

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