/// <summary>
/// Resets the builder to an empty set.
/// </summary>
public Builder Clear()
{
fields.Clear();
lastFieldNumber = 0;
lastField = null;
return this;
}
/// <summary>
/// Returns a field builder for the specified field number, including any values
/// which already exist.
/// </summary>
private UnknownField.Builder GetFieldBuilder(int number)
{
if (lastField != null) {
if (number == lastFieldNumber) {
return lastField;
}
// Note: AddField() will reset lastField and lastFieldNumber.
AddField(lastFieldNumber, lastField.Build());
}
if (number == 0) {
return null;
}
lastField = UnknownField.CreateBuilder();
UnknownField existing;
if (fields.TryGetValue(number, out existing)) {
lastField.MergeFrom(existing);
}
lastFieldNumber = number;
return lastField;
}
/// <summary>
/// Adds a field to the set. If a field with the same number already exists, it
/// is replaced.
/// </summary>
public Builder AddField(int number, UnknownField field)
{
if (number == 0) {
throw new ArgumentOutOfRangeException("number", "Zero is not a valid field number.");
}
if (lastField != null && lastFieldNumber == number) {
// Discard this.
lastField = null;
lastFieldNumber = 0;
}
fields[number] = field;
return this;
}