/*
* Copyright 2002-2015 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.context;
import org.springframework.core.
ResolvableType;
import org.springframework.core.
ResolvableTypeProvider;
import org.springframework.util.
Assert;
/**
* An {@link ApplicationEvent} that carries an arbitrary payload.
*
* <p>Mainly intended for internal use within the framework.
*
* @author Stephane Nicoll
* @since 4.2
* @param <T> the payload type of the event
*/
@
SuppressWarnings("serial")
public class
PayloadApplicationEvent<T> extends
ApplicationEvent implements
ResolvableTypeProvider {
private final T
payload;
/**
* Create a new PayloadApplicationEvent.
* @param source the object on which the event initially occurred (never {@code null})
* @param payload the payload object (never {@code null})
*/
public
PayloadApplicationEvent(
Object source, T
payload) {
super(
source);
Assert.
notNull(
payload, "Payload must not be null");
this.
payload =
payload;
}
@
Override
public
ResolvableType getResolvableType() {
return
ResolvableType.
forClassWithGenerics(
getClass(),
ResolvableType.
forInstance(
getPayload()));
}
/**
* Return the payload of the event.
*/
public T
getPayload() {
return this.
payload;
}
}