mcs/class/referencesource/System.Data/System/Data/RelatedView.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="RelatedView.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 // <owner current="true" primary="false">Microsoft</owner>
   7 //------------------------------------------------------------------------------
   8
   9 namespace System.Data {
  10     using System;
  11     using System.Diagnostics;
  12
  13     internal sealed class RelatedView : DataView, IFilter {
  14         private readonly Nullable<DataKey> parentKey;
  15         private readonly DataKey childKey;
  16         private readonly DataRowView parentRowView;
  17         private readonly object[] filterValues;
  18
  19         public RelatedView(DataColumn[] columns, object[] values)
  20             : base(columns[0].Table, false) {
  21             if (values == null) {
  22                 throw ExceptionBuilder.ArgumentNull("values");
  23             }
  24             this.parentRowView = null;
  25             this.parentKey = null;
  26             this.childKey = new DataKey(columns, true);
  27             this.filterValues = values;
  28             Debug.Assert(this.Table == childKey.Table, "Key.Table Must be equal to Current Table");
  29             base.ResetRowViewCache();
  30         }
  31
  32
  33         public RelatedView(DataRowView parentRowView, DataKey parentKey, DataColumn[] childKeyColumns) : base(childKeyColumns[0].Table, false) {
  34             this.filterValues = null;
  35             this.parentRowView = parentRowView;
  36             this.parentKey = parentKey;
  37             this.childKey = new DataKey(childKeyColumns, true);
  38             Debug.Assert (this.Table == childKey.Table, "Key.Table Must be equal to Current Table");
  39             base.ResetRowViewCache();
  40         }
  41
  42         private object[] GetParentValues()
  43         {
  44             if (filterValues != null) {
  45                 return filterValues;
  46             }
  47
  48             if (!parentRowView.HasRecord()) {
  49                 return null;
  50             }
  51             return parentKey.Value.GetKeyValues(parentRowView.GetRecord());
  52         }
  53
  54
  55         public bool Invoke(DataRow row, DataRowVersion version) {
  56             object[] parentValues = GetParentValues();
  57             if (parentValues == null) {
  58                 return false;
  59             }
  60
  61             object[] childValues = row.GetKeyValues(childKey, version);
  62 #if false
  63             for (int i = 0; i < keyValues.Length; i++) {
  64                 Debug.WriteLine("keyvalues[" + (i).ToString() + "] = " + Convert.ToString(keyValues[i]));
  65             }
  66             for (int i = 0; i < values.Length; i++) {
  67                 Debug.WriteLine("values[" + (i).ToString() + "] = " + Convert.ToString(values[i]));
  68             }
  69 #endif
  70             bool allow = true;
  71             if (childValues.Length != parentValues.Length) {
  72                 allow = false;
  73             }
  74             else {
  75                 for (int i = 0; i < childValues.Length; i++) {
  76                     if (!childValues[i].Equals(parentValues[i])) {
  77                         allow = false;
  78                         break;
  79                     }
  80                 }
  81             }
  82
  83             IFilter baseFilter = base.GetFilter();
  84             if (baseFilter != null) {
  85                 allow &= baseFilter.Invoke(row, version);
  86             }
  87
  88             return allow;
  89         }
  90
  91         internal override IFilter GetFilter() {
  92             return this;
  93         }
  94
  95         // move to OnModeChanged
  96         public override DataRowView AddNew() {
  97             DataRowView addNewRowView = base.AddNew();
  98             addNewRowView.Row.SetKeyValues(childKey, GetParentValues());
  99             return addNewRowView;
 100         }
 101
 102         internal override void SetIndex(string newSort, DataViewRowState newRowStates, IFilter newRowFilter) {
 103             SetIndex2(newSort, newRowStates, newRowFilter, false);
 104             Reset();
 105         }
 106
 107         public override bool Equals( DataView dv) {
 108             RelatedView other = dv as RelatedView;
 109             if (other == null) {
 110                 return false;
 111             }
 112             if (!base.Equals(dv)) {
 113                 return false;
 114             }
 115             if (filterValues != null) {
 116                 return (CompareArray(this.childKey.ColumnsReference, other.childKey.ColumnsReference) && CompareArray(this.filterValues, other.filterValues));
 117             }
 118             else {
 119                 if (other.filterValues != null)
 120                     return false;
 121                 return (CompareArray(this.childKey.ColumnsReference, other.childKey.ColumnsReference) &&
 122                         CompareArray(this.parentKey.Value.ColumnsReference, this.parentKey.Value.ColumnsReference) &&
 123                         parentRowView.Equals(other.parentRowView));
 124             }
 125         }
 126
 127         private bool CompareArray(object[] value1, object[] value2) {
 128             if (value1 == null || value2 == null) {
 129                 return value1 == value2;
 130             }
 131             if (value1.Length != value2.Length) {
 132                 return false;
 133             }
 134             for(int i = 0; i < value1.Length; i++) {
 135                 if (value1[i] != value2[i])
 136                     return false;
 137             }
 138             return true;
 139         }
 140     }
 141 }