Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / TrackingValidationObjectDictionary.cs / 1305376 / TrackingValidationObjectDictionary.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net { using System; using System.Collections; using System.Collections.Specialized; using System.Collections.Generic; using System.Diagnostics; // TrackingValidationObjectDictionary uses an internal collection of objects to store // only those objects which are not strings. It still places a copy of the string // value of these objects into the base StringDictionary so that the public methods // of StringDictionary still function correctly. // NOTE: all keys are converted to lowercase prior to adding to ensure consistency of // values between keys in the StringDictionary and internalObjects because StringDictionary // automatically does this internally internal class TrackingValidationObjectDictionary : StringDictionary { #region Private Fields // even though validators may exist, we should not initialize this initially since by default it is empty // and it may never be populated with values if the user does not set them private IDictionaryinternalObjects = null; private readonly IDictionary validators; #endregion #region Constructors // it is valid for validators to be null. this means that no validation should be performed internal TrackingValidationObjectDictionary(IDictionary validators) { IsChanged = false; this.validators = validators; } #endregion #region Private Methods // precondition: key must not be null // addValue determines if we are doing a set (false) or an add (true) private void PersistValue(string key, string value, bool addValue) { Debug.Assert(key != null, "key was null"); // StringDictionary will automatically store the key as lower case so // we must convert it so that the validators and internalObjects will // be consistent key = key.ToLowerInvariant(); // StringDictionary allows keys with null values however null values for parameters in // ContentDisposition have no meaning so they must be ignored on add. StringDictionary // would not throw on null so this can't either since it would be a breaking change. // in addition, a key with an empty value is not valid so we do not persist those either if (!string.IsNullOrEmpty(value)) { if (validators != null && validators.ContainsKey(key)) { // run the validator for this key; it will throw if the value is invalid object valueToAdd = validators[key](value); // now that the value is valid, ensure that internalObjects exists since we have to // add to it if (internalObjects == null) { internalObjects = new Dictionary (); } if (addValue) { // set will do an Add if the key does not exist but if the user // specifically called Add then we must let it throw internalObjects.Add(key, valueToAdd); base.Add(key, valueToAdd.ToString()); } else { internalObjects[key] = valueToAdd; base[key] = valueToAdd.ToString(); } } else { if (addValue) { base.Add(key, value); } else { base[key] = value; } } IsChanged = true; } } #endregion #region Internal Fields // set to true if any values have been changed by any mutator method internal bool IsChanged { get; set; } // delegate to perform validation and conversion if necessary // these MUST throw on invalid values. Additionally, each validator // may be passed a string OR another type of object and so should react // appropriately internal delegate object ValidateAndParseValue(object valueToValidate); #endregion #region Internal Methods // public interface only allows strings so this provides a means // to get the objects when they are not strings internal object InternalGet(string key) { // internalObjects will throw if the key is not found so we must check it if (internalObjects != null && internalObjects.ContainsKey(key)) { return internalObjects[key]; } else { // this will return null if the key does not exist so no check needed return base[key]; } } // this method bypasses validation // preconditions: value MUST have been validated and must not be null internal void InternalSet(string key, object value) { // InternalSet is only used with objects that belong in internalObjects so we must always // initialize it here if (internalObjects == null) { internalObjects = new Dictionary (); } // always replace the existing value when we set internally internalObjects[key] = value; base[key] = value.ToString(); IsChanged = true; } #endregion #region Public Fields public override string this[string key] { get { // no need to check internalObjects since the string equivalent in base will // already have been set correctly when the value was originally passed in return base[key]; } set { PersistValue(key, value, false); } } #endregion #region Public Methods public override void Add(string key, string value) { PersistValue(key, value, true); } public override void Clear() { if (internalObjects != null) { internalObjects.Clear(); } base.Clear(); IsChanged = true; } public override void Remove(string key) { if (internalObjects != null && internalObjects.ContainsKey(key)) { internalObjects.Remove(key); } base.Remove(key); IsChanged = true; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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