/// <summary>
/// Checks if the offset is valid, gets the RuleStatus and
/// RuleStatusVector for the offset and returns that TextBoundary.
/// </summary>
/// <param name="offset">Offset to check in text.</param>
/// <param name="textBoundary">TextBoundary for the given offset.</param>
/// <returns>true if the offset is valid; false otherwise.</returns>
private bool TryGetTextBoundaryFromOffset(int offset, out TextBoundary textBoundary)
{
textBoundary = default(TextBoundary);
if (offset == DONE)
{
return(false);
}
const int length = 128;
int[] vector = new int[length];
ErrorCode errorCode;
int actualLen = NativeMethods.ubrk_getRuleStatusVec(_breakIterator, vector, length, out errorCode);
if (errorCode.IsFailure())
{
throw new Exception("BreakIterator.GetRuleStatusVector failed! " + errorCode);
}
if (actualLen > length)
{
vector = new int[actualLen];
NativeMethods.ubrk_getRuleStatusVec(_breakIterator, vector, vector.Length, out errorCode);
if (errorCode.IsFailure())
{
throw new Exception("BreakIterator.GetRuleStatusVector failed! " + errorCode);
}
}
int[] ruleStatuses;
// Constrain the size of the array to actual number of elements
// that were returned.
if (actualLen < vector.Length)
{
ruleStatuses = new int[actualLen];
Array.Copy(vector, ruleStatuses, actualLen);
}
else
{
ruleStatuses = vector;
}
textBoundary = new TextBoundary(offset, ruleStatuses);
return(true);
}
