/// <summary>
/// Builds the final automaton from a list of entries.
/// </summary>
private FST <object> BuildAutomaton(BytesRefSorter sorter)
{
// Build the automaton.
Outputs <object> outputs = NoOutputs.Singleton;
object empty = outputs.NoOutput;
Builder <object> builder = new Builder <object>(FST.INPUT_TYPE.BYTE1, 0, 0, true, true, shareMaxTailLength, outputs, null, false, PackedInts.DEFAULT, true, 15);
BytesRef scratch = new BytesRef();
BytesRef entry;
IntsRef scratchIntsRef = new IntsRef();
int count = 0;
BytesRefIterator iter = sorter.GetEnumerator();
while ((entry = iter.Next()) != null)
{
count++;
if (scratch.CompareTo(entry) != 0)
{
builder.Add(Util.Fst.Util.ToIntsRef(entry, scratchIntsRef), empty);
scratch.CopyBytes(entry);
}
}
return(count == 0 ? null : builder.Finish());
}
/// <summary>
/// Creates an FSTCompletion with the specified options. </summary>
/// <param name="buckets">
/// The number of buckets for weight discretization. Buckets are used
/// in <seealso cref="#add(BytesRef, int)"/> and must be smaller than the number
/// given here.
/// </param>
/// <param name="sorter">
/// <seealso cref="BytesRefSorter"/> used for re-sorting input for the automaton.
/// For large inputs, use on-disk sorting implementations. The sorter
/// is closed automatically in <seealso cref="#build()"/> if it implements
/// <seealso cref="Closeable"/>.
/// </param>
/// <param name="shareMaxTailLength">
/// Max shared suffix sharing length.
///
/// See the description of this parameter in <seealso cref="Builder"/>'s constructor.
/// In general, for very large inputs you'll want to construct a non-minimal
/// automaton which will be larger, but the construction will take far less ram.
/// For minimal automata, set it to <seealso cref="Integer#MAX_VALUE"/>. </param>
public FSTCompletionBuilder(int buckets, BytesRefSorter sorter, int shareMaxTailLength)
{
if (buckets < 1 || buckets > 255)
{
throw new System.ArgumentException("Buckets must be >= 1 and <= 255: " + buckets);
}
if (sorter == null)
{
throw new System.ArgumentException("BytesRefSorter must not be null.");
}
this.sorter = sorter;
this.buckets = buckets;
this.shareMaxTailLength = shareMaxTailLength;
}
/// <summary>
/// Builds the final automaton from a list of entries.
/// </summary>
private FST<object> BuildAutomaton(BytesRefSorter sorter)
{
// Build the automaton.
Outputs<object> outputs = NoOutputs.Singleton;
object empty = outputs.NoOutput;
Builder<object> builder = new Builder<object>(FST.INPUT_TYPE.BYTE1, 0, 0, true, true, shareMaxTailLength, outputs, null, false, PackedInts.DEFAULT, true, 15);
BytesRef scratch = new BytesRef();
BytesRef entry;
IntsRef scratchIntsRef = new IntsRef();
int count = 0;
BytesRefIterator iter = sorter.GetEnumerator();
while ((entry = iter.Next()) != null)
{
count++;
if (scratch.CompareTo(entry) != 0)
{
builder.Add(Util.Fst.Util.ToIntsRef(entry, scratchIntsRef), empty);
scratch.CopyBytes(entry);
}
}
return count == 0 ? null : builder.Finish();
}
/// <summary>
/// Creates an FSTCompletion with the specified options. </summary>
/// <param name="buckets">
/// The number of buckets for weight discretization. Buckets are used
/// in <seealso cref="#add(BytesRef, int)"/> and must be smaller than the number
/// given here.
/// </param>
/// <param name="sorter">
/// <seealso cref="BytesRefSorter"/> used for re-sorting input for the automaton.
/// For large inputs, use on-disk sorting implementations. The sorter
/// is closed automatically in <seealso cref="#build()"/> if it implements
/// <seealso cref="Closeable"/>.
/// </param>
/// <param name="shareMaxTailLength">
/// Max shared suffix sharing length.
///
/// See the description of this parameter in <seealso cref="Builder"/>'s constructor.
/// In general, for very large inputs you'll want to construct a non-minimal
/// automaton which will be larger, but the construction will take far less ram.
/// For minimal automata, set it to <seealso cref="Integer#MAX_VALUE"/>. </param>
public FSTCompletionBuilder(int buckets, BytesRefSorter sorter, int shareMaxTailLength)
{
if (buckets < 1 || buckets > 255)
{
throw new System.ArgumentException("Buckets must be >= 1 and <= 255: " + buckets);
}
if (sorter == null)
{
throw new System.ArgumentException("BytesRefSorter must not be null.");
}
this.sorter = sorter;
this.buckets = buckets;
this.shareMaxTailLength = shareMaxTailLength;
}