package org.jfree.formula.operators;
import org.jfree.formula.lvalues.TypeValuePair;
import org.jfree.formula.FormulaContext;
import org.jfree.formula.EvaluationException;
import org.jfree.formula.LibFormulaErrorValue;
import org.jfree.formula.typing.TypeRegistry;
import org.jfree.formula.typing.Type;
import org.jfree.formula.typing.ExtendedComparator;
import org.jfree.formula.typing.coretypes.LogicalType;
/**
* Creation-Date: 06.06.2007, 18:52:25
*
* @author Thomas Morgner
*/
public abstract class AbstractCompareOperator implements InfixOperator
{
private static final TypeValuePair RETURN_TRUE = new TypeValuePair(LogicalType.TYPE, Boolean.TRUE);
private static final TypeValuePair RETURN_FALSE = new TypeValuePair(LogicalType.TYPE, Boolean.FALSE);
public AbstractCompareOperator()
{
}
public final TypeValuePair evaluate(final FormulaContext context,
final TypeValuePair value1,
final TypeValuePair value2)
throws EvaluationException
{
final TypeRegistry typeRegistry = context.getTypeRegistry();
final Type type1 = value1.getType();
final Type type2 = value2.getType();
final Object value1Raw = value1.getValue();
final Object value2Raw = value2.getValue();
if (value1Raw == null || value2Raw == null)
{
throw new EvaluationException(LibFormulaErrorValue.ERROR_NA_VALUE);
}
final ExtendedComparator comparator = typeRegistry.getComparator(type1, type2);
final Integer result = comparator.compare (type1, value1Raw, type2, value2Raw);
if (result == null)
{
throw new EvaluationException
(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
}
if (evaluate(result.intValue()))
{
return RETURN_TRUE;
}
return RETURN_FALSE;
}
protected abstract boolean evaluate(int compareResult);
}