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//
// PullingReader.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 PullingReader : TextReader {
private string identifier;
public string Identifier {
get { return identifier; }
set { identifier = value; }
}
//////////////////////////
public delegate bool Pull (StringBuilder buffer);
Pull pull;
StringBuilder pullBuffer = new StringBuilder ();
bool done = false;
public PullingReader (Pull _pull) : base ()
{
pull = _pull;
}
private void DoPull (int neededSize)
{
while (! done && pullBuffer.Length < neededSize) {
try {
done = ! pull (pullBuffer);
} catch (Exception e) {
Logger.Log.Debug (e, "Caught exception pulling text from {0}", pull);
}
}
}
public override void Close ()
{
}
public override int Peek ()
{
DoPull (1);
return done ? -1 : (int) pullBuffer [0];
}
public override int Read ()
{
DoPull (1);
if (done)
return -1;
int x = (int) pullBuffer [0];
pullBuffer.Remove (0, 1);
return x;
}
public override int Read (char[] buffer, int index, int count)
{
DoPull (count);
if (done && pullBuffer.Length < count)
count = pullBuffer.Length;
for (int i = 0; i < count; ++i)
buffer [index + i] = pullBuffer [i];
pullBuffer.Remove (0, count);
return count;
}
public override int ReadBlock (char[] buffer, int index, int count)
{
return Read (buffer, index, count);
}
public override string ReadLine ()
{
int i = 0;
DoPull (1);
if (done)
return null;
while (true) {
while (i < pullBuffer.Length) {
if (pullBuffer [i] == '\n') {
string foo = pullBuffer.ToString (0, i);
pullBuffer.Remove (0, i+1);
return foo;
}
++i;
}
// If there is nothing else to pull, just return everything
// in our buffer.
if (done) {
string str = pullBuffer.ToString ();
pullBuffer.Length = 0;
return str;
}
DoPull (2 * pullBuffer.Length);
}
}
public override string ReadToEnd ()
{
while (! done)
DoPull (2 * pullBuffer.Length);
string str = pullBuffer.ToString ();
pullBuffer.Length = 0;
return str;
}
}
}
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