org.javalite.activejdbc.conversion.ZeroToNullConverter Maven / Gradle / Ivy
/*
Copyright 2009-2014 Igor Polevoy
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package org.javalite.activejdbc.conversion;
/**
* Converts instances of Number that are zero to null.
*
* @author ericbn
*/
public enum ZeroToNullConverter implements Converter {
INSTANCE;
public static ZeroToNullConverter instance() { return INSTANCE; }
private ZeroToNullConverter() { }
/**
* @param sourceClass source Class
* @param destinationClass destination Class
* @return true if sourceClass is a subclass of Number
*/
@Override
public boolean canConvert(Class sourceClass, Class destinationClass) {
return Number.class.isAssignableFrom(sourceClass);
}
/**
* @param source instance of String
* @return null if source.intValue() is zero, source otherwise
*/
@Override
public Object convert(Number source) {
return source.intValue() == 0 ? null : source;
}
}