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/*
* Copyright 2000-2016 Vaadin Ltd.
*
* 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.vaadin.data.provider;
import java.util.EventObject;
import java.util.Objects;
/**
* An event fired when the data of a {@code DataProvider} changes.
*
* @see DataProviderListener
*
* @author Vaadin Ltd
* @since 8.0
*
*
* @param <T>
* the data type
*/
public class DataChangeEvent<T> extends EventObject {
/**
* An event fired when a single item of a {@code DataProvider} has been
* updated.
*
* @param <T>
* the data type
*/
public static class DataRefreshEvent<T> extends DataChangeEvent<T> {
private final T item;
/**
* Creates a new data refresh event originating from the given data
* provider.
*
* @param source
* the data provider, not null
* @param item
* the updated item, not null
*/
public DataRefreshEvent(DataProvider<T, ?> source, T item) {
super(source);
Objects.requireNonNull(item, "Refreshed item can't be null");
this.item = item;
}
/**
* Gets the refreshed item.
*
* @return the refreshed item
*/
public T getItem() {
return item;
}
}
/**
* Creates a new {@code DataChangeEvent} event originating from the given
* data provider.
*
* @param source
* the data provider, not null
*/
public DataChangeEvent(DataProvider<T, ?> source) {
super(source);
}
@Override
public DataProvider<T, ?> getSource() {
return (DataProvider<T, ?>) super.getSource();
}
}
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