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using System;
using System.IO;
using System.Threading.Tasks;
namespace VersOne.Epub
{
/// <summary>
/// The base class for a content file reference located outside of the EPUB archive (e.g., an HTML file or an image).
/// Unlike <see cref="EpubRemoteContentFile" />, the classes derived from this base class contain only a reference to the file but don't contain its content.
/// </summary>
public abstract class EpubRemoteContentFileRef : EpubContentFileRef
{
/// <summary>
/// Initializes a new instance of the <see cref="EpubRemoteContentFileRef" /> class with a specified content file key, a content type of the file reference,
/// a MIME type of the file's content, and content downloader options.
/// </summary>
/// <param name="metadata">Metadata of this content file reference.</param>
/// <param name="epubContentLoader">A reference to the EPUB content loader which provides methods to download the content of this file.</param>
/// <exception cref="ArgumentNullException">The <paramref name="metadata" /> parameter is <c>null</c>.</exception>
/// <exception cref="ArgumentNullException">The <paramref name="epubContentLoader" /> parameter is <c>null</c>.</exception>
protected EpubRemoteContentFileRef(EpubContentFileRefMetadata metadata, IEpubContentLoader epubContentLoader)
: base(metadata, epubContentLoader)
{
}
/// <summary>
/// Gets the absolute URI of the remote content file (as it is specified in the EPUB manifest).
/// </summary>
public string Url => Key;
/// <summary>
/// Gets the location of the content file which is always <see cref="EpubContentLocation.REMOTE" /> for remote content file references.
/// </summary>
public override EpubContentLocation ContentLocation => EpubContentLocation.REMOTE;
/// <summary>
/// Downloads the whole content of the referenced file and returns it as a byte array.
/// </summary>
/// <returns>Content of the referenced file.</returns>
public byte[] DownloadContentAsBytes()
{
return EpubContentLoader.LoadContentAsBytes(Metadata);
}
/// <summary>
/// Asynchronously downloads the whole content of the referenced file and returns it as a byte array.
/// </summary>
/// <returns>A task that represents the asynchronous download operation. The value of the TResult parameter contains the content of the referenced file.</returns>
public Task<byte[]> DownloadContentAsBytesAsync()
{
return EpubContentLoader.LoadContentAsBytesAsync(Metadata);
}
/// <summary>
/// Downloads the whole content of the referenced file and returns it as a string.
/// </summary>
/// <returns>Content of the referenced file.</returns>
public string DownloadContentAsText()
{
return EpubContentLoader.LoadContentAsText(Metadata);
}
/// <summary>
/// Asynchronously downloads the whole content of the referenced file and returns it as a string.
/// </summary>
/// <returns>A task that represents the asynchronous download operation. The value of the TResult parameter contains the content of the referenced file.</returns>
public Task<string> DownloadContentAsTextAsync()
{
return EpubContentLoader.LoadContentAsTextAsync(Metadata);
}
/// <summary>
/// Starts the download of the referenced file and returns a <see cref="Stream" /> to access its content.
/// </summary>
/// <returns>A <see cref="Stream" /> to access the referenced file's content.</returns>
public Stream GetDownloadingContentStream()
{
return EpubContentLoader.GetContentStream(Metadata);
}
/// <summary>
/// Starts the download of the referenced file and returns a <see cref="Stream" /> to access its content.
/// </summary>
/// <returns>
/// A task that represents the asynchronous download operation.
/// The value of the TResult parameter contains a <see cref="Stream" /> to access the referenced file's content.
/// </returns>
public Task<Stream> GetDownloadingContentStreamAsync()
{
return EpubContentLoader.GetContentStreamAsync(Metadata);
}
}
}
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