/*
* 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.function.text;
import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.LibFormulaErrorValue;
import org.pentaho.reporting.libraries.formula.function.Function;
import org.pentaho.reporting.libraries.formula.function.ParameterCallback;
import org.pentaho.reporting.libraries.formula.lvalues.TypeValuePair;
import org.pentaho.reporting.libraries.formula.typing.Type;
import org.pentaho.reporting.libraries.formula.typing.TypeRegistry;
import org.pentaho.reporting.libraries.formula.typing.coretypes.TextType;
/**
* This function returns text where an old text is substituted with a new text.
*
* @author Cedric Pronzato
*/
public class ReplaceFunction implements Function
{
private static final long serialVersionUID = -7678830657739807780L;
public ReplaceFunction()
{
}
public TypeValuePair evaluate(final FormulaContext context,
final ParameterCallback parameters) throws EvaluationException
{
final int parameterCount = parameters.getParameterCount();
if (parameterCount != 4)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
}
final TypeRegistry typeRegistry = context.getTypeRegistry();
final Type newTextType = parameters.getType(3);
final Object newTextValue = parameters.getValue(3);
final Type textType = parameters.getType(0);
final Object textValue = parameters.getValue(0);
final Type startType = parameters.getType(1);
final Object startValue = parameters.getValue(1);
final Type lengthType = parameters.getType(2);
final Object lengthValue = parameters.getValue(2);
final String newText = typeRegistry.convertToText(newTextType, newTextValue);
final String text = typeRegistry.convertToText(textType, textValue);
final Number start = typeRegistry.convertToNumber(startType, startValue);
if (start.intValue() <= 0)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
}
final Number length = typeRegistry.convertToNumber(lengthType, lengthValue);
if (length.intValue() < 0)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
}
final String result1 = MidFunction.process(text, 1, (start.intValue() - 1));
final String result2 = MidFunction.process(text, (start.intValue() + length.intValue()), (text.length()));
final StringBuffer buffer = new StringBuffer(result1.length() + newText.length() + result2.length());
buffer.append(result1);
buffer.append(newText);
buffer.append(result2);
return new TypeValuePair(TextType.TYPE, buffer.toString());
}
public String getCanonicalName()
{
return "REPLACE";
}
}