// // MultiReader.cs // // Copyright (C) 2004 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.Collections; using System.IO; using System.Text; namespace Beagle.Util { public class MultiReader : TextReader { Queue readers = new Queue (); public MultiReader () { } public void Add (TextReader reader) { readers.Enqueue (reader); } public int Count { get { return readers.Count; } } private TextReader Current { get { if (readers.Count == 0) return null; return (TextReader) readers.Peek (); } } private void Next () { if (readers.Count > 0) readers.Dequeue (); } public override void Close () { while (Current != null) { Current.Close (); Next (); } } public override int Peek () { while (Current != null) { int peek = Current.Peek (); if (peek != -1) return peek; Next (); } return -1; } public override int Read () { while (Current != null) { int read = Current.Read (); if (read != -1) return read; Next (); } return -1; } public override int Read (char[] buffer, int index, int count) { int total = 0; while (Current != null && count > 0) { int actual = Current.Read (buffer, index + total, count); if (actual < count) Next (); count -= actual; total += actual; } return total; } public override int ReadBlock (char[] buffer, int index, int count) { return Read (buffer, index, count); } public override string ReadLine () { while (Current != null) { string str = Current.ReadLine (); if (str != null) return str; Next (); } return null; } public override string ReadToEnd () { StringBuilder all = new StringBuilder (""); while (Current != null) { string str = Current.ReadToEnd (); if (str != null) all.Append (str); Next (); } return all.ToString (); } } }