/// <summary> Input an instance for filtering. Ordinarily the instance is processed
/// and made available for output immediately. Some filters require all
/// instances be read before producing output.
///
/// </summary>
/// <param name="instance">the input instance
/// </param>
/// <returns> true if the filtered instance may now be
/// collected with output().
/// </returns>
/// <exception cref="IllegalStateException">if no input format has been set.
/// </exception>
public override bool input(Instance instance)
{
if (getInputFormat() == null)
{
throw new System.SystemException("No input instance format defined");
}
if (m_NewBatch)
{
resetQueue();
m_NewBatch = false;
}
if (instance.isMissing(m_AttIndex.Index))
{
if (!get_MatchMissingValues())
{
push((Instance) instance.copy());
return true;
}
else
{
return false;
}
}
if (Numeric)
{
if (!m_Values.Invert)
{
if (instance.value_Renamed(m_AttIndex.Index) < m_Value)
{
push((Instance) instance.copy());
return true;
}
}
else
{
if (instance.value_Renamed(m_AttIndex.Index) >= m_Value)
{
push((Instance) instance.copy());
return true;
}
}
}
if (Nominal)
{
if (m_Values.isInRange((int) instance.value_Renamed(m_AttIndex.Index)))
{
Instance temp = (Instance) instance.copy();
if (get_ModifyHeader())
{
temp.setValue(m_AttIndex.Index, m_NominalMapping[(int) instance.value_Renamed(m_AttIndex.Index)]);
}
push(temp);
return true;
}
}
return false;
}