/// <summary>
/// Creates a new browser object with a set of filters.
/// </summary>
/// <param name="context">The system context to use.</param>
/// <param name="view">The view which may restrict the set of references/nodes found.</param>
/// <param name="referenceType">The type of references being followed.</param>
/// <param name="includeSubtypes">Whether subtypes of the reference type are followed.</param>
/// <param name="browseDirection">Which way the references are being followed.</param>
/// <param name="browseName">The browse name of a specific target (used when translating browse paths).</param>
/// <param name="additionalReferences">Any additional references that should be included.</param>
/// <param name="internalOnly">If true the browser should not making blocking calls to external systems.</param>
/// <param name="source">The segment being accessed.</param>
public ArchiveFolderBrowser(
ISystemContext context,
ViewDescription view,
NodeId referenceType,
bool includeSubtypes,
BrowseDirection browseDirection,
QualifiedName browseName,
IEnumerable <IReference> additionalReferences,
bool internalOnly,
ArchiveFolderState source)
:
base(
context,
view,
referenceType,
includeSubtypes,
browseDirection,
browseName,
additionalReferences,
internalOnly)
{
m_source = source;
m_stage = Stage.Begin;
}
/// <summary>
/// Creates a new browser object with a set of filters.
/// </summary>
/// <param name="context">The system context to use.</param>
/// <param name="view">The view which may restrict the set of references/nodes found.</param>
/// <param name="referenceType">The type of references being followed.</param>
/// <param name="includeSubtypes">Whether subtypes of the reference type are followed.</param>
/// <param name="browseDirection">Which way the references are being followed.</param>
/// <param name="browseName">The browse name of a specific target (used when translating browse paths).</param>
/// <param name="additionalReferences">Any additional references that should be included.</param>
/// <param name="internalOnly">If true the browser should not making blocking calls to external systems.</param>
/// <param name="source">The segment being accessed.</param>
public ArchiveFolderBrowser(
ISystemContext context,
ViewDescription view,
NodeId referenceType,
bool includeSubtypes,
BrowseDirection browseDirection,
QualifiedName browseName,
IEnumerable<IReference> additionalReferences,
bool internalOnly,
ArchiveFolderState source)
:
base(
context,
view,
referenceType,
includeSubtypes,
browseDirection,
browseName,
additionalReferences,
internalOnly)
{
m_source = source;
m_stage = Stage.Begin;
}
/// <summary>
/// Returns the next child.
/// </summary>
private IReference NextChild()
{
UnderlyingSystem system = (UnderlyingSystem)this.SystemContext.SystemHandle;
NodeId targetId = null;
// check if a specific browse name is requested.
if (!QualifiedName.IsNull(base.BrowseName))
{
// check if match found previously.
if (m_position == Int32.MaxValue)
{
return(null);
}
// browse name must be qualified by the correct namespace.
if (m_source.BrowseName.NamespaceIndex != base.BrowseName.NamespaceIndex)
{
return(null);
}
// look for matching folder.
if (m_stage == Stage.Folders && m_folders != null)
{
for (int ii = 0; ii < m_folders.Length; ii++)
{
if (base.BrowseName.Name == m_folders[ii].Name)
{
targetId = ArchiveFolderState.ConstructId(m_folders[ii].UniquePath, m_source.NodeId.NamespaceIndex);
break;
}
}
}
// look for matching item.
else if (m_stage == Stage.Items && m_items != null)
{
for (int ii = 0; ii < m_items.Length; ii++)
{
if (base.BrowseName.Name == m_items[ii].Name)
{
targetId = ArchiveItemState.ConstructId(m_items[ii].UniquePath, m_source.NodeId.NamespaceIndex);
break;
}
}
}
// look for matching parent.
else if (m_stage == Stage.Parents)
{
ArchiveFolder parent = m_source.ArchiveFolder.GetParentFolder();
if (base.BrowseName.Name == parent.Name)
{
targetId = ArchiveFolderState.ConstructId(parent.UniquePath, m_source.NodeId.NamespaceIndex);
}
}
m_position = Int32.MaxValue;
}
// return the child at the next position.
else
{
// look for next folder.
if (m_stage == Stage.Folders && m_folders != null)
{
if (m_position >= m_folders.Length)
{
return(null);
}
targetId = ArchiveFolderState.ConstructId(m_folders[m_position++].UniquePath, m_source.NodeId.NamespaceIndex);
}
// look for next item.
else if (m_stage == Stage.Items && m_items != null)
{
if (m_position >= m_items.Length)
{
return(null);
}
targetId = ArchiveItemState.ConstructId(m_items[m_position++].UniquePath, m_source.NodeId.NamespaceIndex);
}
// look for matching parent.
else if (m_stage == Stage.Parents)
{
ArchiveFolder parent = m_source.ArchiveFolder.GetParentFolder();
if (parent != null)
{
targetId = ArchiveFolderState.ConstructId(parent.UniquePath, m_source.NodeId.NamespaceIndex);
}
}
}
// create reference.
if (targetId != null)
{
return(new NodeStateReference(ReferenceTypeIds.Organizes, false, targetId));
}
return(null);
}