/*
* 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) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.util.beans;
import java.lang.reflect.Array;
import java.util.ArrayList;
import org.pentaho.reporting.libraries.base.util.CSVQuoter;
import org.pentaho.reporting.libraries.base.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
{
if (o == null)
{
throw new NullPointerException("Value must not be null");
}
if (o.getClass().isArray() == false)
{
throw new BeanException("Value must be a array");
}
final int size = Array.getLength(o);
final StringBuilder buffer = new StringBuilder(size * 25);
final CSVQuoter quoter = new CSVQuoter(',', '"');
for (int i = 0; i < size; i++)
{
if (i != 0)
{
buffer.append(',');
}
final Object o1 = Array.get(o, i);
if (o1 != null)
{
final String original = elementConverter.toAttributeValue(o1);
if (original.length() == 0)
{
buffer.append("\"\"");
}
else
{
buffer.append(quoter.doQuoting(original));
}
}
}
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
{
if (s == null)
{
throw new NullPointerException();
}
final CSVTokenizer tokenizer = new CSVTokenizer(s, false);
final ArrayList<Object> elements = new ArrayList<Object>();
while (tokenizer.hasMoreTokens())
{
final String token = tokenizer.nextToken();
if (token == null || token.length() == 0)
{
elements.add(null);
}
else
{
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;
}
}