org.springframework.data.gemfire.repository.Wrapper Maven / Gradle / Ivy
/*
* Copyright 2012 the original author or authors.
*
* 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.springframework.data.gemfire.repository;
import java.io.Serializable;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* Simple value object to hold an entity alongside an external key the entity shall be stored under.
*
* @author Oliver Gierke
*/
public final class Wrapper {
private final KEY key;
private final T entity;
/**
* The entity to handle as well as the key.
*
* @param entity the application domain object/entity to wrap.
* @param key must not be {@literal null}.
*/
public Wrapper(T entity, KEY key) {
Assert.notNull(key);
this.entity = entity;
this.key = key;
}
/**
* @return the key
*/
public KEY getKey() {
return key;
}
/**
* @return the entity
*/
public T getEntity() {
return entity;
}
/*
* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object value) {
if (value == this) {
return true;
}
if (!(value instanceof Wrapper)) {
return false;
}
Wrapper that = (Wrapper) value;
return (this.key.equals(that.key) && ObjectUtils.nullSafeEquals(this.entity, that.entity));
}
/*
* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
int result = 17;
result += 31 * key.hashCode();
result += 31 * ObjectUtils.nullSafeHashCode(entity);
return result;
}
/*
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return ObjectUtils.nullSafeToString(getEntity());
}
}