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/*
* Copyright 2000-2022 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.event.selection;
import java.util.Collections;
import java.util.Optional;
import java.util.Set;
import com.vaadin.data.HasValue.ValueChangeEvent;
import com.vaadin.ui.AbstractSingleSelect;
import com.vaadin.ui.Component;
import com.vaadin.ui.SingleSelect;
/**
* Fired when the selection changes in a listing component.
*
* @author Vaadin Ltd.
*
* @param <T>
* the type of the selected item
* @since 8.0
*/
public class SingleSelectionEvent<T> extends ValueChangeEvent<T>
implements SelectionEvent<T> {
/**
* Creates a new selection change event.
*
* @param source
* the listing that fired the event
* @param oldSelection
* the item that was previously selected
* @param userOriginated
* {@code true} if this event originates from the client,
* {@code false} otherwise.
*/
public SingleSelectionEvent(AbstractSingleSelect<T> source, T oldSelection,
boolean userOriginated) {
super(source, oldSelection, userOriginated);
}
/**
* Creates a new selection change event in a component.
*
* @param component
* the component where the event originated
* @param source
* the single select source
* @param oldSelection
* the item that was previously selected
* @param userOriginated
* {@code true} if this event originates from the client,
* {@code false} otherwise.
*/
public SingleSelectionEvent(Component component, SingleSelect<T> source,
T oldSelection, boolean userOriginated) {
super(component, source, oldSelection, userOriginated);
}
/**
* Returns an optional of the item that was selected, or an empty optional
* if a previously selected item was deselected.
* <p>
* The result is the current selection of the source
* {@link AbstractSingleSelect} object. So it's always exactly the same as
* optional describing {@link AbstractSingleSelect#getValue()}.
*
* @see #getValue()
*
* @return the selected item or an empty optional if deselected
*
* @see com.vaadin.data.SelectionModel.Single#getSelectedItem()
* SelectionModel.Single#getSelectedItem()
*/
public Optional<T> getSelectedItem() {
return Optional.ofNullable(getValue());
}
/**
* The single select on which the Event initially occurred.
*
* @return The single select on which the Event initially occurred.
*/
@Override
public SingleSelect<T> getSource() {
return (SingleSelect<T>) super.getSource();
}
@Override
public Optional<T> getFirstSelectedItem() {
return getSelectedItem();
}
@Override
public Set<T> getAllSelectedItems() {
Optional<T> selectedItem = getSelectedItem();
if (selectedItem.isPresent()) {
return Collections.singleton(selectedItem.get());
} else {
return Collections.emptySet();
}
}
}
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