/**
* =========================================
* LibFormula : a free Java formula library
* =========================================
*
* Project Info: http://reporting.pentaho.org/libformula/
*
* (C) Copyright 2006-2008, by Pentaho Corporation and Contributors.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
*
* ------------
* DefaultSequence.java
* ------------
*/
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.lvalues.StaticValue;
import org.pentaho.reporting.libraries.formula.lvalues.TypeValuePair;
import org.pentaho.reporting.libraries.formula.typing.ArrayCallback;
import org.pentaho.reporting.libraries.formula.typing.Sequence;
/**
* @author Cedric Pronzato
*/
public class AnySequence implements Sequence
{
private int rowCursor;
private int columnCursor;
private LValue single;
private ArrayCallback array;
private FormulaContext context;
public AnySequence(final FormulaContext context)
{
if (context == null)
{
throw new NullPointerException();
}
this.context = context;
}
public AnySequence(final ArrayCallback array, final FormulaContext context)
{
if (context == null)
{
throw new NullPointerException();
}
if (array == null)
{
throw new NullPointerException();
}
this.array = array;
this.context = context;
}
public AnySequence(final LValue single, final FormulaContext context)
{
if (context == null)
{
throw new NullPointerException();
}
if (single == null)
{
throw new NullPointerException();
}
this.single = single;
this.context = context;
}
protected AnySequence(final AnySequence anySequence)
{
this.single = anySequence.single;
this.context = anySequence.context;
this.array = anySequence.array;
this.rowCursor = anySequence.rowCursor;
this.columnCursor = anySequence.columnCursor;
}
public boolean hasNext() throws EvaluationException
{
// empty sequence
if (single == null && array == null)
{
return false;
}
// sequence of one object
if (single != null && rowCursor == 0)
{
return isValidNext(single);
}
// else array
if (array != null)
{
final int rowCount = array.getRowCount();
final int columnCount = array.getColumnCount();
if (rowCursor < rowCount && columnCursor < columnCount)
{
for (; rowCursor < rowCount; rowCursor++)
{
for (; columnCursor < columnCount; columnCursor++)
{
final LValue value = array.getRaw(rowCursor, columnCursor);
if (isValidNext(value))
{
return true;
}
}
}
columnCursor = 0; // go to start of the next row
}
}
return false;
}
protected boolean isValidNext(final LValue o)
{
if (o == null)
{
return false;
}
return true;
}
public Object next() throws EvaluationException
{
if (single != null && rowCursor == 0)
{
rowCursor++;
final TypeValuePair pair = single.evaluate();
return pair.getValue();
}
if (array != null)
{
final Object value = array.getValue(rowCursor, columnCursor);
// advance
if (columnCursor == array.getColumnCount() - 1)
{
rowCursor++;
columnCursor = 0;
}
else
{
columnCursor++;
}
return value;
}
return null;
}
public LValue nextRawValue() throws EvaluationException
{
if (single != null && rowCursor == 0)
{
rowCursor++;
return new StaticValue(single);
}
else if (array != null)
{
final LValue raw = array.getRaw(rowCursor, columnCursor);
// advance
if (columnCursor == array.getColumnCount() - 1)
{
rowCursor++;
columnCursor = 0;
}
else
{
columnCursor++;
}
return raw;
}
return null;
}
protected int getRowCursor()
{
return rowCursor;
}
protected int getColumnCursor()
{
return columnCursor;
}
protected LValue getSingle()
{
return single;
}
protected ArrayCallback getArray()
{
return array;
}
protected FormulaContext getContext()
{
return context;
}
}