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- /*
- * Copyright 2000-2018 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;
-
- import java.util.HashMap;
- import java.util.Map;
-
- import com.vaadin.server.Resource;
-
- /**
- * Icon generator class for declarative support.
- * <p>
- * Provides a straightforward mapping between an item and its icon.
- *
- * @param <T>
- * item type
- */
- class DeclarativeIconGenerator<T> implements IconGenerator<T> {
-
- private IconGenerator<T> fallback;
- private Map<T, Resource> captions = new HashMap<>();
-
- public DeclarativeIconGenerator(IconGenerator<T> fallback) {
- this.fallback = fallback;
- }
-
- @Override
- public Resource apply(T item) {
- return captions.containsKey(item) ? captions.get(item)
- : fallback.apply(item);
- }
-
- /**
- * Sets an {@code icon} for the {@code item}.
- *
- * @param item
- * a data item
- * @param icon
- * an icon for the {@code item}
- */
- protected void setIcon(T item, Resource icon) {
- captions.put(item, icon);
- }
-
- }
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