Exemplo n.º 1
0
        /// <summary>
        /// Since LinkDataView does not support multiple selectors/comparers, it does not make sense for
        /// them to Find using multiple keys.
        /// This overriden method prevents users calling multi-key find on dataview.
        /// </summary>
        internal override int FindByKey(object[] key)
        {
            // must have string or expression based sort specified
            if (base.SortComparison == null && String.IsNullOrEmpty(base.Sort))
            {
                // This is the exception message from DataView that we want to use
                throw ExceptionBuilder.IndexKeyLength(0, 0);
            }
            else if (base.SortComparison != null && key.Length != sortExpressionBuilder.Count)
            {
                throw DataSetUtil.InvalidOperation(SR.Format(SR.LDV_InvalidNumOfKeys, sortExpressionBuilder.Count));
            }

            if (base.SortComparison == null)
            {
                // using string to sort
                return(base.FindByKey(key));
            }
            else
            {
                Index.ComparisonBySelector <object, DataRow> compareDelg =
                    new Index.ComparisonBySelector <object, DataRow>(comparerKeyRow);

                List <object> keyList = new List <object>();
                foreach (object singleKey in key)
                {
                    keyList.Add(singleKey);
                }

                Range range = FindRecords <object, DataRow>(compareDelg, keyList);
                return((range.Count == 0) ? -1 : range.Min);
            }
        }
Exemplo n.º 2
0
        /// <summary>
        /// Searches the index and finds a single row where the sort-key matches the input key
        /// </summary>
        /// <param name="key">Value of the key to find</param>
        /// <returns>Index of the first match of input key</returns>
        internal override int FindByKey(object key)
        {
            Debug.Assert(base.Sort != null);
            Debug.Assert(!(!String.IsNullOrEmpty(base.Sort) && base.SortComparison != null),
                         "string and expression based sort cannot both be set");

            if (!String.IsNullOrEmpty(base.Sort))  // use find for DV's sort string
            {
                return(base.FindByKey(key));
            }
            else if (base.SortComparison == null) // neither string or expr set
            {
                // This is the exception message from DataView that we want to use
                throw ExceptionBuilder.IndexKeyLength(0, 0);
            }
            else  // find for expression based sort
            {
                if (sortExpressionBuilder.Count != 1)
                {
                    throw DataSetUtil.InvalidOperation(SR.Format(SR.LDV_InvalidNumOfKeys, sortExpressionBuilder.Count));
                }

                Index.ComparisonBySelector <object, DataRow> compareDelg =
                    new Index.ComparisonBySelector <object, DataRow>(comparerKeyRow);

                List <object> keyList = new List <object>();
                keyList.Add(key);
                Range range = FindRecords <object, DataRow>(compareDelg, keyList);

                return((range.Count == 0) ? -1 : range.Min);
            }
        }
Exemplo n.º 3
0
        /// <summary>
        /// Searches the index and finds a single row where the sort-key matches the input key
        /// </summary>
        /// <param name="key">Value of the key to find</param>
        /// <returns>Index of the first match of input key</returns>
        internal override int FindByKey(object key)
        {
            /////////////// Preconditions ////////////////
            //check that both string and expression based sort are never simultaneously set
            Debug.Assert(base.Sort != null);
            Debug.Assert(!(!String.IsNullOrEmpty(base.Sort) && base.SortComparison != null));
            /////////////////////////////////////////////

            if (!String.IsNullOrEmpty(base.Sort))  //use find for DV's sort string
            {
                return base.FindByKey(key);
            }
            else if (base.SortComparison == null) //neither string or expr set
            {
                //This is the exception message from DataView that we want to use
                throw ExceptionBuilder.IndexKeyLength(0, 0);
            }
            else  //find for expression based sort
            {
                if (sortExpressionBuilder.Count !=1)
                    throw DataSetUtil.InvalidOperation(Strings.LDV_InvalidNumOfKeys(sortExpressionBuilder.Count));

                Index.ComparisonBySelector<object, DataRow> compareDelg =
                    new Index.ComparisonBySelector<object, DataRow>(comparerKeyRow);

                List<object> keyList = new List<object>();
                keyList.Add(key);
                Range range = FindRecords<object, DataRow>(compareDelg, keyList);
               
                return (range.Count == 0) ? -1 : range.Min;
            }
        }
Exemplo n.º 4
0
        /// <summary>
        /// Since LinkDataView does not support multiple selectors/comparers, it does not make sense for
        /// them to Find using multiple keys.
        /// This overriden method prevents users calling multi-key find on dataview.
        /// </summary>
        internal override int FindByKey(object[] key)
        {
            //---------Checks ----------------
            //must have string or expression based sort specified
            if (base.SortComparison == null && String.IsNullOrEmpty(base.Sort)) 
            {
                //This is the exception message from DataView that we want to use
                throw ExceptionBuilder.IndexKeyLength(0, 0);
            }
            else if (base.SortComparison != null && key.Length != sortExpressionBuilder.Count)
            {
                throw DataSetUtil.InvalidOperation(Strings.LDV_InvalidNumOfKeys(sortExpressionBuilder.Count));
            }
            //--------------------------------

            if (base.SortComparison == null)//using string to sort
                return base.FindByKey(key);
            else
            {
                Index.ComparisonBySelector<object, DataRow> compareDelg =
                    new Index.ComparisonBySelector<object, DataRow>(comparerKeyRow);

                List<object> keyList = new List<object>();
                foreach (object singleKey in key)
                {
                    keyList.Add(singleKey);    
                }
                Range range = FindRecords<object, DataRow>(compareDelg, keyList);
                return (range.Count == 0) ? -1 : range.Min;
            }
               
        }
Exemplo n.º 5
0
 /// <summary>This method exists for LinqDataView to keep a level of abstraction away from the RBTree</summary>
 internal Range FindRecords <TKey, TRow>(Index.ComparisonBySelector <TKey, TRow> comparison, TKey key) where TRow : DataRow
 {
     return(_index.FindRecords(comparison, key));
 }