/*
This code is derived from jgit (http://eclipse.org/jgit).
Copyright owners are documented in jgit's IP log.

This program and the accompanying materials are made available
under the terms of the Eclipse Distribution License v1.0 which
accompanies this distribution, is reproduced below, and is
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- Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.

- Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the following
  disclaimer in the documentation and/or other materials provided
  with the distribution.

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  names of its contributors may be used to endorse or promote
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*/

using System;
using System.IO;
using NGit;
using NGit.Errors;
using NGit.Transport;
using Sharpen;

namespace NGit.Transport
{
	/// <summary>Single shot fetch from a streamed Git bundle.</summary>
	/// <remarks>
	/// Single shot fetch from a streamed Git bundle.
	/// <p>
	/// The bundle is read from an unbuffered input stream, which limits the
	/// transport to opening at most one FetchConnection before needing to recreate
	/// the transport instance.
	/// </remarks>
	public class TransportBundleStream : NGit.Transport.Transport, TransportBundle
	{
		private InputStream src;

		/// <summary>Create a new transport to fetch objects from a streamed bundle.</summary>
		/// <remarks>
		/// Create a new transport to fetch objects from a streamed bundle.
		/// <p>
		/// The stream can be unbuffered (buffering is automatically provided
		/// internally to smooth out short reads) and unpositionable (the stream is
		/// read from only once, sequentially).
		/// <p>
		/// When the FetchConnection or the this instance is closed the supplied
		/// input stream is also automatically closed. This frees callers from
		/// needing to keep track of the supplied stream.
		/// </remarks>
		/// <param name="db">repository the fetched objects will be loaded into.</param>
		/// <param name="uri">
		/// symbolic name of the source of the stream. The URI can
		/// reference a non-existent resource. It is used only for
		/// exception reporting.
		/// </param>
		/// <param name="in">the stream to read the bundle from.</param>
		public TransportBundleStream(Repository db, URIish uri, InputStream @in) : base(db
			, uri)
		{
			src = @in;
		}

		/// <exception cref="NGit.Errors.TransportException"></exception>
		public override FetchConnection OpenFetch()
		{
			if (src == null)
			{
				throw new TransportException(uri, JGitText.Get().onlyOneFetchSupported);
			}
			try
			{
				return new BundleFetchConnection(this, src);
			}
			finally
			{
				src = null;
			}
		}

		/// <exception cref="System.NotSupportedException"></exception>
		public override PushConnection OpenPush()
		{
			throw new NotSupportedException(JGitText.Get().pushIsNotSupportedForBundleTransport
				);
		}

		public override void Close()
		{
			if (src != null)
			{
				try
				{
					src.Close();
				}
				catch (IOException)
				{
				}
				finally
				{
					// Ignore a close error.
					src = null;
				}
			}
		}
	}
}
