PropertyFilter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / Base / Core / PropertyEditing / PropertyFilter.cs / 1305376 / PropertyFilter.cs
                        

                        
                            namespace System.Activities.Presentation.PropertyEditing { 
    using System;
    using System.Collections.Generic;
    using System.Runtime;
    using System.Activities.Presentation; 

    ///  
    /// This class is used as part of the searching/filtering functionality that may provided 
    /// by the property editing host.  It contains a list of predicates (i.e. strings to match against)
    ///  
    [Fx.Tag.XamlVisible(false)]
    public class PropertyFilter
    {
 
        private List _predicates = new List();
 
        ///  
        /// Creates a PropertyFilter.
        ///  
        /// String representation of predicates, space delimited
        public PropertyFilter(string filterText)
        {
            SetPredicates(filterText); 
        }
 
        ///  
        /// Creates a PropertyFilter.
        ///  
        /// IEnumerable collection of predicates
        public PropertyFilter(IEnumerable predicates) {
            SetPredicates(predicates);
        } 

        ///  
        /// Readonly property that returns true if this PropertyFilter does not have any predicates 
        /// 
        public bool IsEmpty { 
            get { return this._predicates == null || this._predicates.Count == 0; }
        }

        private void SetPredicates(string filterText) { 

            if (string.IsNullOrEmpty(filterText)) 
                return; 

            string[] filterParts = filterText.Split(' '); 

            for (int i=0; i < filterParts.Length; i++) {
                if (!string.IsNullOrEmpty(filterParts[i])) {
                    _predicates.Add(new PropertyFilterPredicate(filterParts[i])); 
                }
            } 
        } 

        private void SetPredicates(IEnumerable predicates) { 

            if (predicates == null)
                return;
 
            foreach (PropertyFilterPredicate predicate in predicates) {
                if (predicate != null) { 
                    _predicates.Add(predicate); 
                }
            } 
        }

        /// 
        /// Matches this filter against a particular filter target. The 
        /// filter returns true if there are no predicates or if one or more
        /// predicates match the filter target. 
        ///  
        /// Target to attempt matching
        /// True if there are no predicates or if one or more 
        /// predicates match the filter target, false otherwise
        /// If target is null.
        public bool Match(IPropertyFilterTarget target) {
            if (target == null) 
                throw FxTrace.Exception.ArgumentNull("target");
 
            if (this.IsEmpty) 
                return true;
 
            // Perform an OR over all predicates
            for (int i = 0; i < this._predicates.Count; i++) {
                if (target.MatchesPredicate(_predicates[i]))
                    return true; 
            }
 
            return false; 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK