internal object GetVariableValueFromProvider(VariablePath variablePath, out CmdletProviderContext context, out SessionStateScope scope, CommandOrigin origin)
{
scope = null;
if (variablePath == null)
{
throw PSTraceSource.NewArgumentNullException("variablePath");
}
context = null;
DriveScopeItemSearcher searcher = new DriveScopeItemSearcher(this, variablePath);
object obj2 = null;
if (searcher.MoveNext())
{
PSDriveInfo current = (PSDriveInfo)searcher.Current;
if (current == null)
{
return obj2;
}
context = new CmdletProviderContext(this.ExecutionContext, origin);
context.Drive = current;
Collection<IContentReader> contentReader = null;
try
{
contentReader = this.GetContentReader(new string[] { variablePath.QualifiedName }, context);
}
catch (ItemNotFoundException)
{
return obj2;
}
catch (System.Management.Automation.DriveNotFoundException)
{
return obj2;
}
catch (ProviderNotFoundException)
{
return obj2;
}
catch (NotImplementedException exception)
{
ProviderInfo provider = null;
this.Globber.GetProviderPath(variablePath.QualifiedName, out provider);
throw this.NewProviderInvocationException("ProviderCannotBeUsedAsVariable", SessionStateStrings.ProviderCannotBeUsedAsVariable, provider, variablePath.QualifiedName, exception, false);
}
catch (NotSupportedException exception2)
{
ProviderInfo info3 = null;
this.Globber.GetProviderPath(variablePath.QualifiedName, out info3);
throw this.NewProviderInvocationException("ProviderCannotBeUsedAsVariable", SessionStateStrings.ProviderCannotBeUsedAsVariable, info3, variablePath.QualifiedName, exception2, false);
}
if ((contentReader == null) || (contentReader.Count == 0))
{
return obj2;
}
if (contentReader.Count > 1)
{
foreach (IContentReader reader in contentReader)
{
reader.Close();
}
PSArgumentException e = PSTraceSource.NewArgumentException("path", "SessionStateStrings", "VariablePathResolvedToMultiple", new object[] { variablePath.QualifiedName });
ProviderInfo info4 = null;
this.Globber.GetProviderPath(variablePath.QualifiedName, out info4);
throw this.NewProviderInvocationException("ProviderVariableSyntaxInvalid", SessionStateStrings.ProviderVariableSyntaxInvalid, info4, variablePath.QualifiedName, e);
}
IContentReader reader2 = contentReader[0];
try
{
IList list = reader2.Read(-1L);
if (list == null)
{
return obj2;
}
if (list.Count == 0)
{
return null;
}
if (list.Count == 1)
{
return list[0];
}
return list;
}
catch (Exception exception4)
{
ProviderInfo info5 = null;
this.Globber.GetProviderPath(variablePath.QualifiedName, out info5);
CommandProcessorBase.CheckForSevereException(exception4);
ProviderInvocationException exception5 = new ProviderInvocationException("ProviderContentReadError", SessionStateStrings.ProviderContentReadError, info5, variablePath.QualifiedName, exception4);
throw exception5;
}
finally
{
reader2.Close();
}
}
return obj2;
}
/// <summary>
/// Looks up the specified variable and returns the context under which
/// the variable was found as well as the variable itself.
/// </summary>
///
/// <param name="variablePath">
/// The VariablePath helper for the variable.
/// </param>
///
/// <param name="scope">
/// The scope the variable was found in. Null if the variable wasn't found.
/// </param>
///
/// <param name="context">
/// Returns the context under which the variable was found. The context will
/// have the drive data already set. This will be null if the variable was
/// not found.
/// </param>
///
/// <param name="origin">
/// The origin of the caller of this API
/// </param>
///
/// <returns>
/// The variable if it was found or null if it was not.
/// </returns>
///
/// <remarks>
/// The <paramref name="variablePath" /> is first parsed to see if it contains a drive
/// specifier or special scope. If a special scope is found ("LOCAL" or "GLOBAL")
/// then only that scope is searched for the variable. If any other drive specifier
/// is found the lookup goes in the following order.
/// - current scope
/// - each consecutive parent scope until the variable is found.
/// - global scope
/// </remarks>
///
/// <exception cref="ArgumentNullException">
/// If <paramref name="variablePath"/> is null.
/// </exception>
///
/// <exception cref="ProviderNotFoundException">
/// If the <paramref name="variablePath"/> refers to a provider that could not be found.
/// </exception>
///
/// <exception cref="DriveNotFoundException">
/// If the <paramref name="variablePath"/> refers to a drive that could not be found.
/// </exception>
///
/// <exception cref="NotSupportedException">
/// If the provider that the <paramref name="variablePath"/> refers to does
/// not support this operation.
/// </exception>
///
/// <exception cref="ProviderInvocationException">
/// If the provider threw an exception.
/// </exception>
///
#pragma warning disable 0162
internal object GetVariableValueFromProvider(
VariablePath variablePath,
out CmdletProviderContext context,
out SessionStateScope scope,
CommandOrigin origin)
{
scope = null;
if (variablePath == null)
{
throw PSTraceSource.NewArgumentNullException("variablePath");
}
Dbg.Diagnostics.Assert(
!variablePath.IsVariable,
"This method can only be used to retrieve provider content");
context = null;
DriveScopeItemSearcher searcher =
new DriveScopeItemSearcher(
this,
variablePath);
object result = null;
do // false loop
{
if (!searcher.MoveNext())
{
break;
}
PSDriveInfo drive = ((IEnumerator<PSDriveInfo>)searcher).Current;
if (drive == null)
{
break;
}
// Create a new CmdletProviderContext and set the drive data
context = new CmdletProviderContext(this.ExecutionContext, origin);
context.Drive = drive;
#if true
// PSVariable get/set is the get/set of content in the provider
Collection<IContentReader> readers = null;
try
{
readers =
GetContentReader(new string[] { variablePath.QualifiedName }, context);
}
// If the item is not found we just return null like the normal
// variable semantics.
catch (ItemNotFoundException)
{
break;
}
catch (DriveNotFoundException)
{
break;
}
catch (ProviderNotFoundException)
{
break;
}
catch (NotImplementedException notImplemented)
{
// First get the provider for the path.
ProviderInfo providerInfo = null;
string unused =
this.Globber.GetProviderPath(variablePath.QualifiedName, out providerInfo);
throw NewProviderInvocationException(
"ProviderCannotBeUsedAsVariable",
SessionStateStrings.ProviderCannotBeUsedAsVariable,
providerInfo,
variablePath.QualifiedName,
notImplemented,
false);
}
catch (NotSupportedException notSupported)
{
// First get the provider for the path.
ProviderInfo providerInfo = null;
string unused =
this.Globber.GetProviderPath(variablePath.QualifiedName, out providerInfo);
throw NewProviderInvocationException(
"ProviderCannotBeUsedAsVariable",
SessionStateStrings.ProviderCannotBeUsedAsVariable,
providerInfo,
variablePath.QualifiedName,
notSupported,
false);
}
if (readers == null || readers.Count == 0)
{
// The drive was found but the path was wrong or something so return null.
// We don't want to continue searching if the provider didn't support content
// or the path wasn't found.
break;
}
if (readers.Count > 1)
{
// Since more than one path was resolved, this is an error.
//Before throwing exception. Close the readers to avoid sharing violation.
foreach (IContentReader r in readers)
{
r.Close();
}
PSArgumentException argException =
PSTraceSource.NewArgumentException(
"path",
SessionStateStrings.VariablePathResolvedToMultiple,
variablePath.QualifiedName);
// First get the provider for the path.
ProviderInfo providerInfo = null;
string unused =
this.Globber.GetProviderPath(variablePath.QualifiedName, out providerInfo);
throw NewProviderInvocationException(
"ProviderVariableSyntaxInvalid",
SessionStateStrings.ProviderVariableSyntaxInvalid,
providerInfo,
variablePath.QualifiedName,
argException);
}
IContentReader reader = readers[0];
try
{
// Read all the content
IList resultList = reader.Read(-1);
if (resultList != null)
{
if (resultList.Count == 0)
{
result = null;
}
else if (resultList.Count == 1)
{
result = resultList[0];
}
else
{
result = resultList;
}
}
}
catch (Exception e) // Third-party callout, catch-all OK
{
// First get the provider for the path.
ProviderInfo providerInfo = null;
string unused =
this.Globber.GetProviderPath(variablePath.QualifiedName, out providerInfo);
CommandProcessorBase.CheckForSevereException(e);
ProviderInvocationException providerException =
new ProviderInvocationException(
"ProviderContentReadError",
SessionStateStrings.ProviderContentReadError,
providerInfo,
variablePath.QualifiedName,
e);
throw providerException;
}
finally
{
reader.Close();
}
#else
try
{
GetItem(variablePath.LookupPath.ToString(), context);
}
catch (ItemNotFoundException)
{
break;
}
Collection<PSObject> items = context.GetAccumulatedObjects ();
if (items != null &&
items.Count > 0)
{
result = items[0];
if (!items[0].basObjectIsEmpty)
{
result = items[0].BaseObject;
}
try
{
DictionaryEntry entry = (DictionaryEntry)result;
result = entry.Value;
}
// Since DictionaryEntry is a value type we have to
// try the cast and catch the exception to determine
// if it is a DictionaryEntry type.
catch (InvalidCastException)
{
}
}
#endif
break;
} while (false);
return result;
} // GetVariableFromProvider
