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//
// 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 ();
}
}
}
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