/// <summary>
/// Determine equality, based only on extent IDs.
/// </summary>
/// <param name="other">the other CosmosExtent to compare</param>
/// <returns>true if other is a CosmosExtent with an equal ExtentId; false otherwise</returns>
public bool Equals(CosmosExtent other)
{
return extentId == other.extentId;
// && length == other.length && sequence == other.sequence;
}
/// <summary>
/// Retrieve the set of extents that make up the given stream, in sorted order.
/// </summary>
/// <remarks>
/// For basic stream usage, the extents do not need to be considered.
/// This method is intended for advanced manipulation of the underlying
/// Cosmos data.
/// </remarks>
/// <param name="fileName">the name of the stream</param>
/// <returns>the list of extents, or null if it cannot be retrieved.</returns>
public static CosmosExtent[] GetExtents(string fileName)
{
try
{
// extract volume name:
string volume = fileName;
int v = volume.IndexOf("//");
if (v < 0) return null;
v += 2;
v = volume.IndexOf('/', v);
if (v < 0) return null;
v++;
v = volume.IndexOf('/', v);
if (v < 0) return null;
v++;
volume = volume.Substring(0, v);
System.Diagnostics.Process proc = CosmosExec(string.Format(cosmosExtentsCmdArgs, fileName));
string[] chunks;
using (StreamReader outReader = proc.StandardOutput)
{
chunks = outReader.ReadToEnd().Replace("\r\n", "\n").Replace("\n\n", "\0").Split('\0');
}
proc.WaitForExit();
int exit = proc.ExitCode;
proc.Close();
// what are the error conditions? What about an empty stream? ***
if (exit != 0 || chunks.Length < 2)
{
if (exit != 0 || chunks.Length == 0 || chunks[0].ToLower().Trim().StartsWith("command failed"))
{
return null;
}
return new CosmosExtent[0];
}
CosmosExtent[] res = new CosmosExtent[chunks.Length - 1];
for (int i = 1; i < chunks.Length; i++)
{
res[i - 1] = new CosmosExtent(volume, chunks[i]);
}
return res;
}
catch
{
return null;
}
}
/// <summary>
/// Create a copy of this CosmosExtent.
/// </summary>
/// <returns>a copy of this CosmosExtent</returns>
/// <remarks>
/// Note that the Nodes array is shared with any new copies.
/// </remarks>
public CosmosExtent Clone()
{
CosmosExtent res = new CosmosExtent(extentId, length);
res.sequence = sequence;
res.volume = volume;
res.nodes = nodes;
return res;
}
