/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2008 - 2009 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.formula.typing.sequence;
import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.lvalues.LValue;
import org.pentaho.reporting.libraries.formula.typing.ArrayCallback;
import org.pentaho.reporting.libraries.formula.typing.Type;
import org.pentaho.reporting.libraries.formula.typing.NumberSequence;
/**
* @author Cedric Pronzato
*/
public class DefaultNumberSequence extends AnySequence implements NumberSequence
{
/**
* Empty number sequence.
*/
public DefaultNumberSequence(final FormulaContext context)
{
super(context);
}
/**
* Number sequence bounded to only one number item.
*
* @param n A number
*/
public DefaultNumberSequence(final LValue n, final FormulaContext context)
{
super(n, context);
}
/**
* Number sequence bounded to an array.
*
* @param array
*/
public DefaultNumberSequence(final ArrayCallback array, final FormulaContext context)
{
super(array, context);
}
public DefaultNumberSequence(final AnySequence anySequence)
{
super(anySequence);
}
protected boolean isValidNext(final LValue o) throws EvaluationException
{
if (o == null)
{
return false;
}
final Type type = o.getValueType();
if (type == null)
{
throw new IllegalStateException();
}
if (type.isFlagSet(Type.NUMERIC_TYPE))
{
return true;
}
return false;
}
public Number nextNumber() throws EvaluationException
{
final Object value = super.next();
if (value instanceof Number)
{
return (Number) value;
}
return null;
}
}