final String text = typeRegistry.convertToText(textType, textValue);
final String oldText = typeRegistry.convertToText(oldTextType, oldTextValue);
if (oldText.length() == 0)
{
return new TypeValuePair(TextType.TYPE, text);
}
final Type newTextType = parameters.getType(2);
final Object newTextValue = parameters.getValue(2);
final String newText = typeRegistry.convertToText(newTextType, newTextValue);
if (parameterCount == 3)
{
int oldIndex = 0;
int index = text.indexOf(oldText);
if (index == -1)
{
return new TypeValuePair(TextType.TYPE, text);
}
final StringBuffer result = new StringBuffer(text.length());
while (index >= 0)
{
result.append(text.substring(oldIndex, index));
result.append(newText);
oldIndex = index + oldText.length();
index = text.indexOf(oldText, oldIndex);
}
result.append(text.substring(oldIndex));
return new TypeValuePair(TextType.TYPE, result.toString());
}
// Instead of replacing all occurences, the user only requested to replace
// a specific one.
final Type whichType = parameters.getType(3);
final Object whichValue = parameters.getValue(3);
final Number n = typeRegistry.convertToNumber(whichType, whichValue);
if (n.doubleValue() < 1)
{
throw EvaluationException.getInstance(
LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
}
final int nthOccurence = n.intValue();
int index = text.indexOf(oldText);
if (index == -1)
{
return new TypeValuePair(TextType.TYPE, text);
}
String result = text;
int counter = 1;
while (index >= 0)
{
if (counter == nthOccurence)
{
final StringBuffer buffer = new StringBuffer(result);
buffer.replace(index, index + oldText.length(), newText);
result = buffer.toString();
return new TypeValuePair(TextType.TYPE, result);
}
index = result.indexOf(oldText, index + 1);
counter += 1;
}
return new TypeValuePair(TextType.TYPE, result);
}