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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.ui.components.grid;
import java.util.Collections;
import java.util.Optional;
import java.util.Set;
import com.vaadin.event.selection.SelectionListener;
import com.vaadin.server.AbstractExtension;
import com.vaadin.shared.Registration;
/**
* Selection model that doesn't allow selecting anything from the grid.
*
* @author Vaadin Ltd
*
* @since 8.0
*
* @param <T>
* the type of items in the grid
*/
public class NoSelectionModel<T> extends AbstractExtension
implements GridSelectionModel<T> {
@Override
public Set<T> getSelectedItems() {
return Collections.emptySet();
}
@Override
public Optional<T> getFirstSelectedItem() {
return Optional.empty();
}
@Override
public void select(T item) {
}
@Override
public void deselect(T item) {
}
@Override
public void deselectAll() {
}
@Override
public Registration addSelectionListener(SelectionListener<T> listener) {
throw new UnsupportedOperationException(
"This selection model doesn't allow selection, cannot add selection listeners to it");
}
@Override
public void setUserSelectionAllowed(boolean allowed) {
}
@Override
public boolean isUserSelectionAllowed() {
return false;
}
}
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