/*
* 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 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.util.beans;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.beans.PropertyEditor;
/**
* A class that handles the conversion of {@link Integer} attributes to and from their {@link String} representation.
*
* @author Thomas Morgner
*/
public class GenericValueConverter implements ValueConverter
{
private PropertyDescriptor propertyDescriptor;
private PropertyEditor propertyEditor;
/**
* Creates a new value converter.
*/
public GenericValueConverter(final PropertyDescriptor pd)
throws IntrospectionException
{
if (pd == null)
{
throw new NullPointerException("PropertyDescriptor must not be null.");
}
if (pd.getPropertyEditorClass() == null)
{
throw new IntrospectionException("Property has no editor.");
}
this.propertyDescriptor = pd;
this.propertyEditor = createPropertyEditor(pd);
}
private PropertyEditor createPropertyEditor(final PropertyDescriptor pi)
throws IntrospectionException
{
final Class c = pi.getPropertyEditorClass();
try
{
return (PropertyEditor) c.newInstance();
}
catch (Exception e)
{
throw new IntrospectionException("Unable to create PropertyEditor.");
}
}
/**
* Converts the attribute to a string.
*
* @param o the attribute ({@link Integer} expected).
* @return A string representing the {@link Integer} 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();
}
final Class aClass = BeanUtility.getPropertyType(propertyDescriptor);
if (aClass.isInstance(o) == false)
{
throw new BeanException("Failed to convert object of type " + o.getClass() + ": Not a " + aClass.getName());
}
propertyEditor.setValue(o);
return propertyEditor.getAsText();
}
/**
* Converts a string to a {@link Integer}.
*
* @param s the string.
* @return a {@link Integer}.
*/
public Object toPropertyValue(final String s)
{
if (s == null)
{
throw new NullPointerException();
}
propertyEditor.setAsText(s);
return propertyEditor.getValue();
}
}