SetContentCommand.cs

/********************************************************************++
Copyright (c) Microsoft Corporation.  All rights reserved.
--********************************************************************/

using System.Management.Automation;
using System.Management.Automation.Internal;
using Dbg = System.Management.Automation;

namespace Microsoft.PowerShell.Commands
{
    /// <summary>
    /// A command to set the content of an item at a specified path
    /// </summary>
    [Cmdlet(VerbsCommon.Set, "Content", DefaultParameterSetName = "Path", SupportsShouldProcess = true, SupportsTransactions = true,
        HelpUri = "http://go.microsoft.com/fwlink/?LinkID=113392")]
    public class SetContentCommand : WriteContentCommandBase
    {
        #region protected members

        /// <summary>
        /// Called by the base class before the streams are open for the path.
        /// This override clears the content from the item. 
        /// </summary>
        /// 
        /// <param name="paths">
        /// The path to the items that will be opened for writing content.
        /// </param>
        /// 
        internal override void BeforeOpenStreams(string[] paths)
        {
            if (paths == null ||
                (paths != null && paths.Length == 0))
            {
                throw PSTraceSource.NewArgumentNullException("paths");
            }

            CmdletProviderContext context = new CmdletProviderContext(GetCurrentContext());

            foreach (string path in paths)
            {
                try
                {
                    InvokeProvider.Content.Clear(path, context);
                    context.ThrowFirstErrorOrDoNothing(true);
                }
                catch (PSNotSupportedException)
                {
                    // If the provider doesn't support clear, that is fine. Continue
                    // on with the setting of the content.
                    continue;
                }
                catch (DriveNotFoundException driveNotFound)
                {
                    WriteError(
                        new ErrorRecord(
                            driveNotFound.ErrorRecord,
                            driveNotFound));
                    continue;
                }
                catch (ProviderNotFoundException providerNotFound)
                {
                    WriteError(
                        new ErrorRecord(
                            providerNotFound.ErrorRecord,
                            providerNotFound));
                    continue;
                }
                catch (ItemNotFoundException)
                {
                    //If the item is not found then there is nothing to clear so ignore this exception.
                    continue;
                }
            }
        } // BeforeOpenStreams

        /// <summary>
        /// Makes the call to ShouldProcess with appropriate action and target strings.
        /// </summary>
        /// 
        /// <param name="path">
        /// The path to the item on which the content will be set.
        /// </param>
        /// 
        /// <returns>
        /// True if the action should continue or false otherwise.
        /// </returns>
        /// 
        internal override bool CallShouldProcess(string path)
        {
            string action = NavigationResources.SetContentAction;

            string target = StringUtil.Format(NavigationResources.SetContentTarget, path);

            return ShouldProcess(target, action);
        }
        #endregion protected members
    } // SetContentCommand
} // namespace Microsoft.PowerShell.Commands