/**
* ========================================
* JFreeReport : a free Java report library
* ========================================
*
* Project Info: http://reporting.pentaho.org/
*
* (C) Copyright 2000-2007, by Object Refinery Limited, 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.]
*
* ------------
* $Id: ArrayValueConverter.java 6659 2008-12-02 15:35:06Z tmorgner $
* ------------
* (C) Copyright 2000-2005, by Object Refinery Limited.
* (C) Copyright 2005-2007, by Pentaho Corporation.
*/
package org.jfree.report.util.beans;
import java.lang.reflect.Array;
import java.util.ArrayList;
import org.jfree.report.util.CSVTokenizer;
/**
* An ValueConverter that handles Arrays. Conversion to arrays is done
* using a CSV string.
*
* @author Thomas Morgner
*/
public class ArrayValueConverter implements ValueConverter
{
/** The converter for the array elements. */
private ValueConverter elementConverter;
/** The element type. */
private Class elementType;
/**
* Creates a new ArrayValueConverter for the given element type and
* array type.
* @param arrayClass the array type
* @param elementConverter the value converter for the array elements.
*/
public ArrayValueConverter (final Class arrayClass,
final ValueConverter elementConverter)
{
if (elementConverter == null)
{
throw new NullPointerException("elementConverter must not be null");
}
if (arrayClass == null)
{
throw new NullPointerException("arrayClass must not be null");
}
this.elementType = arrayClass;
this.elementConverter = elementConverter;
}
/**
* Converts an object to an attribute value.
*
* @param o the object.
* @return the attribute value.
* @throws BeanException if there was an error during the conversion.
*/
public String toAttributeValue (final Object o) throws BeanException
{
final int size = Array.getLength(o);
final StringBuffer buffer = new StringBuffer();
for (int i = 0; i < size; i++)
{
if (i != 0)
{
buffer.append(",");
}
buffer.append(elementConverter.toAttributeValue(Array.get(o, i)));
}
return buffer.toString();
}
/**
* Converts a string to a property value.
*
* @param s the string.
* @return a property value.
* @throws BeanException if there was an error during the conversion.
*/
public Object toPropertyValue (final String s) throws BeanException
{
final CSVTokenizer tokenizer = new CSVTokenizer(s);
final ArrayList elements = new ArrayList();
while (tokenizer.hasMoreTokens())
{
final String token = tokenizer.nextToken();
elements.add(elementConverter.toPropertyValue(token));
}
final Object retval =
Array.newInstance(elementType, elements.size());
for (int i = 0; i < elements.size(); i++)
{
final Object o = elements.get(i);
Array.set(retval, i, o);
}
return retval;
}
}