public override void Write(IWordNode w)
{
if (IsOpen)
{
streamWriter.WriteLine(w.Word);
_numwrites++;
}
else
{
throw new InvalidOperationException("Error: Stream is Closed");
}
}
public override bool isStepAway(IWordNode nod)
{
// Trivial Rejections
// if either string is empty then they are not one step away
if (nod.Word == "" || Word == "")
{
return(false);
}
// If words are equal then they are not 1 step away
if (this.Word.Equals(nod.Word))
{
return(false);
}
// if words differ in length the they cannot be one step away
if (nod.Word.Length != this.Word.Length)
{
return(false);
}
// ----------------------------------------------------
// Take to char array to access character sequence of strings
char[] nodarray = nod.Word.ToCharArray();
char[] thisarray = this.Word.ToCharArray();
// loop through to calculate number of differences
int difs = 0;
for (int i = 0; i < this.Word.Length; i++)
{
if (nodarray[i] != thisarray[i])
{
difs++;
}
}
// function returns true iff a single difference otherwise false
if (difs == 1)
{
return(true);
}
else
{
return(false);
}
}
/// <summary> /// Primary String comparison function /// </summary> /// <param name="node">word to be compared against</param> /// <returns>return true iff there is only a single step difference </returns> public abstract bool isStepAway(IWordNode node);
public abstract bool Contains(IWordNode node);
public abstract void Append(IWordNode node);
/// <summary> /// WordWriter Writes Words one at a time to stream /// </summary> public abstract void Write(IWordNode w);
