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//
// System.IO.TextReader
//
// Authors:
// Marcin Szczepanski (marcins@zipworld.com.au)
// Miguel de Icaza (miguel@gnome.org)
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// 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.Runtime.InteropServices;
namespace System.IO {
[Serializable]
#if NET_2_0
[ComVisible (true)]
#endif
#if NET_2_1
public abstract class TextReader : IDisposable {
#else
public abstract class TextReader : MarshalByRefObject, IDisposable {
#endif
static TextReader ()
{
Null = new NullTextReader ();
}
protected TextReader() { }
public static readonly TextReader Null;
public virtual void Close()
{
Dispose(true);
}
#if NET_2_0
public void Dispose ()
#else
void System.IDisposable.Dispose()
#endif
{
Dispose(true);
}
protected virtual void Dispose (bool disposing)
{
if (disposing){
// If we are explicitly disposed, we can avoid finalization.
GC.SuppressFinalize (this);
}
return;
}
public virtual int Peek()
{
return -1;
}
public virtual int Read()
{
return -1;
}
public virtual int Read ([In, Out] char[] buffer, int index, int count)
{
int c, i;
for (i = 0; i < count; i++) {
if ((c = Read ()) == -1)
return i;
buffer [index + i] = (char)c;
}
return i;
}
public virtual int ReadBlock ([In, Out] char [] buffer, int index, int count)
{
int total_read_count = 0;
int current_read_count = 0;
do {
current_read_count = Read (buffer, index, count);
index += current_read_count;
total_read_count += current_read_count;
count -= current_read_count;
} while (current_read_count != 0 && count > 0);
return total_read_count;
}
public virtual string ReadLine()
{
return String.Empty;
}
public virtual string ReadToEnd()
{
return String.Empty;
}
public static TextReader Synchronized (TextReader reader)
{
if (reader == null)
throw new ArgumentNullException ("reader is null");
if (reader is SynchronizedReader)
return reader;
return new SynchronizedReader (reader);
}
private class NullTextReader : System.IO.TextReader {
public override string ReadLine ()
{
return null;
}
}
}
//
// Synchronized Reader implementation, used internally.
//
[Serializable]
internal class SynchronizedReader : TextReader {
TextReader reader;
public SynchronizedReader (TextReader reader)
{
this.reader = reader;
}
public override void Close ()
{
lock (this){
reader.Close ();
}
}
public override int Peek ()
{
lock (this){
return reader.Peek ();
}
}
public override int ReadBlock (char [] buffer, int index, int count)
{
lock (this){
return reader.ReadBlock (buffer, index, count);
}
}
public override string ReadLine ()
{
lock (this){
return reader.ReadLine ();
}
}
public override string ReadToEnd ()
{
lock (this){
return reader.ReadToEnd ();
}
}
#region Read Methods
public override int Read ()
{
lock (this){
return reader.Read ();
}
}
public override int Read (char [] buffer, int index, int count)
{
lock (this){
return reader.Read (buffer, index, count);
}
}
#endregion
}
}
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