/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more 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.metamodel.util;
import java.io.Serializable;
/**
* A serializable reference to an object which may or may not be serializable.
* Using this reference there is safety that if the object IS serializable, it
* will be serialized, or otherwise it will be gracefully ignored.
*
* @param <E>
*/
public final class SerializableRef<E> implements Ref<E>, Serializable {
private static final long serialVersionUID = 1L;
private final E _serializableObj;
private final transient E _transientObj;
public SerializableRef(E obj) {
if (obj instanceof Serializable) {
_serializableObj = obj;
_transientObj = null;
} else {
_serializableObj = null;
_transientObj = obj;
}
}
@Override
public E get() {
if (_serializableObj == null) {
return _transientObj;
}
return _serializableObj;
}
public boolean isSerializing() {
return _serializableObj != null;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((_serializableObj == null) ? 0 : _serializableObj.hashCode());
result = prime * result + ((_transientObj == null) ? 0 : _transientObj.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
SerializableRef<?> other = (SerializableRef<?>) obj;
if (_serializableObj == null) {
if (other._serializableObj != null)
return false;
} else if (!_serializableObj.equals(other._serializableObj))
return false;
if (_transientObj == null) {
if (other._transientObj != null)
return false;
} else if (!_transientObj.equals(other._transientObj))
return false;
return true;
}
}