org.apache.poi.openxml4j.util.Nullable Maven / Gradle / Ivy
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contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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.apache.poi.openxml4j.util;
/**
* An immutable object that could be defined as null.
*
* @author Julien Chable
* @version 0.9
*/
public final class Nullable {
private E value;
/**
* Constructor.
*/
public Nullable() {
// Do nothing
}
/**
* Constructor.
*
* @param value
* The value to set to this nullable.
*/
public Nullable(E value) {
this.value = value;
}
/**
* Get the store value if any.
*
* @return the store value
*/
public E getValue() {
return value;
}
/**
* Get the status of this nullable.
*
* @return true if the nullable store a value (empty string is
* considered to be a value) else false.
*/
public boolean hasValue() {
return value != null;
}
/**
* Set the stored value to null.
*/
public void nullify() {
value = null;
}
}