public string NextKey(string AfterThisKey)
{
xBucket bucket;
string prefix;
string result = null;
bool found = FindBucketForPrefix(AfterThisKey, out bucket, out prefix, false);
if (found)
{
result = bucket.NextKey(AfterThisKey);
if (result != null)
{
return(result);
}
}
// otherwise look in the next bucket
string nextprefix = this.tree.NextKey(prefix);
if (nextprefix == null)
{
return(null);
}
byte[] databytes = this.tree[nextprefix];
bucket = new xBucket(this);
bucket.Load(databytes);
if (bucket.Count() < 1)
{
throw new BplusTreeException("empty bucket loaded");
}
return(bucket.FirstKey());
}
public bool FindBucketForPrefix(string key, out xBucket bucket, out string prefix, bool keyIsPrefix)
{
bucket = null;
prefix = key;
if (!keyIsPrefix)
{
prefix = PrefixForByteCount(key, this.prefixLength);
}
object datathing = this.tree.Get(prefix, "");
if (datathing is byte[])
{
byte[] databytes = (byte[])datathing;
bucket = new xBucket(this);
bucket.Load(databytes);
if (bucket.Count() < 1)
{
throw new BplusTreeException("empty bucket loaded");
}
return(true);
}
return(false); // default
}
public string NextKey(string AfterThisKey, bool caseSensitive)
{
xBucket bucket;
string prefix;
string result = null;
bool found = FindBucketForPrefix(AfterThisKey, out bucket, out prefix, false, caseSensitive);
if (found)
{
result = bucket.NextKey(AfterThisKey, caseSensitive);
if (result!=null)
{
return result;
}
}
// otherwise look in the next bucket
string nextprefix = this.tree.NextKey(prefix, caseSensitive);
if (nextprefix==null)
{
return null;
}
byte[] databytes = this.tree[nextprefix];
bucket = new xBucket(this);
bucket.Load(databytes);
if (bucket.Count()<1)
{
throw new BplusTreeException("empty bucket loaded");
}
return bucket.FirstKey();
}
public bool FindBucketForPrefix(string key, out xBucket bucket, out string prefix, bool keyIsPrefix, bool caseSensitive)
{
bucket = null;
prefix = key;
if (!keyIsPrefix)
{
prefix = PrefixForByteCount(key, this.prefixLength);
}
object datathing = this.tree.Get(prefix, "", caseSensitive);
if (datathing is byte[])
{
byte[] databytes = (byte[]) datathing;
bucket = new xBucket(this);
bucket.Load(databytes);
if (bucket.Count()<1)
{
throw new BplusTreeException("empty bucket loaded");
}
return true;
}
return false; // default
}
