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March 13, 2020 03:40
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PeopleCode: his class provides a simple Hashtable implementation for storing and looking up Numbers based on String keys
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/* | |
This class provides a simple Hashtable implementation for storing and looking up Numbers based on String keys | |
*/ | |
class NumberHashtable | |
method NumberHashtable(); | |
method Put(&key As string, &value As number); | |
method Add(&key As string, &value As number); | |
method Get(&key As string) Returns number; | |
method GetKeys() Returns array of string; | |
method IsKey(&key As string) Returns boolean; | |
method GetValues() Returns array of number; | |
method SumValues() Returns number; | |
private | |
method GetKeyPosition(&key As string) Returns number; | |
instance array of string &keyArray; | |
instance array of number &valueArray; | |
end-class; | |
/* | |
Constructor | |
*/ | |
method NumberHashtable | |
/*Instantiate the arrays */ | |
&keyArray = CreateArrayRept("", 0); | |
&valueArray = CreateArrayRept(0, 0); | |
end-method; | |
/* | |
Put a value in the Hashtable. If the key already exists, it's value will be replaced with a new one . | |
*/ | |
method Put | |
/+ &key as String, +/ | |
/+ &value as Number +/ | |
Local number &nbr_pos = %This.GetKeyPosition(&key); | |
/**Check if a new entry is to be made or an old value has to be replaced **/ | |
If (&nbr_pos <> - 1) Then | |
&keyArray [&nbr_pos] = &key; | |
&valueArray [&nbr_pos] = &value; | |
Else | |
&keyArray.Push(&key); | |
&valueArray.Push(&value); | |
End-If; | |
end-method; | |
/* | |
Add the value to the Key in the Hashtable. | |
*/ | |
method Add | |
/+ &key as String, +/ | |
/+ &value as Number +/ | |
Local number &nCurrValue = %This.Get(&key); | |
%This.Put(&key, (&nCurrValue + &value)); | |
end-method; | |
/* | |
Get the value for a given key. Returns "" if no value is found . | |
*/ | |
method Get | |
/+ &key as String +/ | |
/+ Returns Number +/ | |
Local number &nbr_pos = %This.GetKeyPosition(&key); | |
If (&nbr_pos <> - 1) Then | |
Return &valueArray [&nbr_pos]; | |
End-If; | |
Return 0; | |
end-method; | |
/* | |
Returns the array of keys | |
*/ | |
method GetKeys | |
/+ Returns Array of String +/ | |
/**Return a clone of the array so that the original array cannot be tampered with **/ | |
Return &keyArray.Clone(); | |
end-method; | |
/* | |
Returns the array of values | |
*/ | |
method GetValues | |
/+ Returns Array of Number +/; | |
/**Return a clone of the array so that the original array cannot be tampered with **/ | |
Return &valueArray.Clone(); | |
end-method; | |
/* | |
Returns the Sum of values | |
*/ | |
method SumValues | |
/+ Returns Number +/ | |
Local number &nCnt, &nTotal; | |
&nTotal = 0; | |
If &valueArray.Len > 0 Then | |
For &nCnt = 1 To &valueArray.Len | |
&nTotal = &nTotal + &valueArray [&nCnt] | |
End-For; | |
End-If; | |
Return &nTotal; | |
end-method; | |
/* | |
Returns a bolean indicating if the provided String is a key or not | |
*/ | |
method IsKey | |
/+ &key as String +/ | |
/+ Returns Boolean +/ | |
Local number &nbr_pos = %This.GetKeyPosition(&key); | |
If (&nbr_pos <> - 1) Then | |
Return True; | |
End-If; | |
Return False; | |
end-method; | |
/* | |
Returns the position in the array of the requested key. Will return -1 if the key is not present . | |
*/ | |
method GetKeyPosition | |
/+ &key as String +/ | |
/+ Returns Number +/ | |
Local number &nbr_Len = &keyArray.Len; | |
Local number &i; | |
For &i = 1 To &nbr_Len | |
If (Exact(&key, &keyArray [&i])) Then | |
Return &i; | |
End-If; | |
End-For; | |
Return - 1; | |
end-method; | |
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