/*
* Copyright 2007 Kasper B. Graversen
*
* 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.supercsv.cellprocessor;
import org.supercsv.cellprocessor.ift.CellProcessor;
/**
* This processor is used to indicate that a cell is optional, and will avoid executing further processors if it
* encounters <tt>null</tt>. It is a simple customization of <tt>ConvertNullTo</tt>.
* <p>
* Prior to version 2.0.0, this processor returned <tt>null</tt> for empty String (""), but was updated because
* Tokenizer now reads empty columns as <tt>null</tt>. It also means that Optional can now be used when writing as well
* (instead of using {@code ConvertNullTo("")}).
*
* @author Kasper B. Graversen
* @author James Bassett
*/
public class Optional extends ConvertNullTo {
/**
* Constructs a new <tt>Optional</tt> processor, which when encountering <tt>null</tt> will return <tt>null</tt>,
* for all other values it will return the value unchanged.
*/
public Optional() {
super(null);
}
/**
* Constructs a new <tt>Optional</tt> processor, which when encountering <tt>null</tt> will return <tt>null</tt> ,
* for all other values it will call the next processor in the chain.
*
* @param next
* the next CellProcessor in the chain
* @throws NullPointerException
* if next is null
*/
public Optional(final CellProcessor next) {
super(null, next);
}
}
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