/*
* 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) 2006 - 2013 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.formula.lvalues;
import org.pentaho.reporting.libraries.formula.LibFormulaErrorValue;
import org.pentaho.reporting.libraries.formula.typing.Type;
import org.pentaho.reporting.libraries.formula.typing.coretypes.ErrorType;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.util.FormulaUtil;
/**
* A reference that queries the datarow.
*
* @author Thomas Morgner
*/
public class ContextLookup extends AbstractLValue
{
private String name;
private static final long serialVersionUID = 2882834743999159722L;
public ContextLookup(final String name)
{
this(name, null);
}
public ContextLookup(final String name, final ParsePosition parsePosition)
{
this.name = name;
setParsePosition(parsePosition);
}
public TypeValuePair evaluate() throws EvaluationException
{
final FormulaContext context = getContext();
final Type type = context.resolveReferenceType(name);
final Object value = context.resolveReference(name);
if (value == null)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_NA_VALUE);
}
return new TypeValuePair(type, value);
}
public Type getValueType()
{
try
{
final FormulaContext context = getContext();
return context.resolveReferenceType(name);
}
catch (final EvaluationException evalex)
{
// exception ignored.
return ErrorType.TYPE;
}
}
public String toString()
{
return FormulaUtil.quoteReference(name);
}
/**
* Checks whether the LValue is constant. Constant lvalues always return the
* same value.
*
* @return
*/
public boolean isConstant()
{
return false;
}
public String getName()
{
return name;
}
}