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//------------------------------------------------------------------------------
// <copyright file="RelatedView.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
namespace System.Data {
using System;
using System.Diagnostics;
internal sealed class RelatedView : DataView, IFilter {
private readonly Nullable<DataKey> parentKey;
private readonly DataKey childKey;
private readonly DataRowView parentRowView;
private readonly object[] filterValues;
public RelatedView(DataColumn[] columns, object[] values)
: base(columns[0].Table, false) {
if (values == null) {
throw ExceptionBuilder.ArgumentNull("values");
}
this.parentRowView = null;
this.parentKey = null;
this.childKey = new DataKey(columns, true);
this.filterValues = values;
Debug.Assert(this.Table == childKey.Table, "Key.Table Must be equal to Current Table");
base.ResetRowViewCache();
}
public RelatedView(DataRowView parentRowView, DataKey parentKey, DataColumn[] childKeyColumns) : base(childKeyColumns[0].Table, false) {
this.filterValues = null;
this.parentRowView = parentRowView;
this.parentKey = parentKey;
this.childKey = new DataKey(childKeyColumns, true);
Debug.Assert (this.Table == childKey.Table, "Key.Table Must be equal to Current Table");
base.ResetRowViewCache();
}
private object[] GetParentValues()
{
if (filterValues != null) {
return filterValues;
}
if (!parentRowView.HasRecord()) {
return null;
}
return parentKey.Value.GetKeyValues(parentRowView.GetRecord());
}
public bool Invoke(DataRow row, DataRowVersion version) {
object[] parentValues = GetParentValues();
if (parentValues == null) {
return false;
}
object[] childValues = row.GetKeyValues(childKey, version);
#if false
for (int i = 0; i < keyValues.Length; i++) {
Debug.WriteLine("keyvalues[" + (i).ToString() + "] = " + Convert.ToString(keyValues[i]));
}
for (int i = 0; i < values.Length; i++) {
Debug.WriteLine("values[" + (i).ToString() + "] = " + Convert.ToString(values[i]));
}
#endif
bool allow = true;
if (childValues.Length != parentValues.Length) {
allow = false;
}
else {
for (int i = 0; i < childValues.Length; i++) {
if (!childValues[i].Equals(parentValues[i])) {
allow = false;
break;
}
}
}
IFilter baseFilter = base.GetFilter();
if (baseFilter != null) {
allow &= baseFilter.Invoke(row, version);
}
return allow;
}
internal override IFilter GetFilter() {
return this;
}
// move to OnModeChanged
public override DataRowView AddNew() {
DataRowView addNewRowView = base.AddNew();
addNewRowView.Row.SetKeyValues(childKey, GetParentValues());
return addNewRowView;
}
internal override void SetIndex(string newSort, DataViewRowState newRowStates, IFilter newRowFilter) {
SetIndex2(newSort, newRowStates, newRowFilter, false);
Reset();
}
public override bool Equals( DataView dv) {
RelatedView other = dv as RelatedView;
if (other == null) {
return false;
}
if (!base.Equals(dv)) {
return false;
}
if (filterValues != null) {
return (CompareArray(this.childKey.ColumnsReference, other.childKey.ColumnsReference) && CompareArray(this.filterValues, other.filterValues));
}
else {
if (other.filterValues != null)
return false;
return (CompareArray(this.childKey.ColumnsReference, other.childKey.ColumnsReference) &&
CompareArray(this.parentKey.Value.ColumnsReference, this.parentKey.Value.ColumnsReference) &&
parentRowView.Equals(other.parentRowView));
}
}
private bool CompareArray(object[] value1, object[] value2) {
if (value1 == null || value2 == null) {
return value1 == value2;
}
if (value1.Length != value2.Length) {
return false;
}
for(int i = 0; i < value1.Length; i++) {
if (value1[i] != value2[i])
return false;
}
return true;
}
}
}
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