/*
* 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 com.github.ggrandes.kvstore.holders;
import java.nio.ByteBuffer;
/**
* Holder for Null value
*
* @author Guillermo Grandes / guillermo.grandes[at]gmail.com
*/
public final class NullHolder extends DataHolder<NullHolder> {
public static final NullHolder NULL = new NullHolder();
public static NullHolder valueOf() {
return NULL;
}
/**
* Constructor necesario para la deserializacion
*/
public NullHolder() {
};
// ========= Basic Object methods =========
@Override
public String toString() {
return "null";
}
@Override
public int hashCode() {
return 0;
}
// ========= Comparable =========
@Override
public boolean equals(final Object obj) {
if (obj instanceof NullHolder) {
return true;
}
return false;
}
@Override
public int compareTo(final NullHolder another) {
return 0;
}
// ========= Serialization =========
@Override
public final int byteLength() {
return 0;
}
@Override
public void serialize(final ByteBuffer buf) {
}
@Override
public NullHolder deserialize(final ByteBuffer buf) {
return valueOf();
}
}