// // DelayedTextWriter.cs // // Copyright (C) 2005 Novell, Inc. // // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in all // copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE // SOFTWARE. // using System; using System.IO; using System.Text; namespace Beagle.Util { // This allows you to delay instantiating a TextWriter // (and thus e.g. opening a file) until the first // write. public class DelayedTextWriter : TextWriter { public delegate TextWriter Builder (); Builder builder; TextWriter writer; public DelayedTextWriter (Builder builder) { this.builder = builder; } public override Encoding Encoding { get { lock (builder) { if (writer == null) writer = builder (); } return writer.Encoding; } } public override void Close () { if (writer != null) writer.Close (); } public override void Flush () { if (writer != null) writer.Flush (); } public override void Write (char value) { lock (builder) { if (writer == null) writer = builder (); } writer.Write (value); } } }