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- /*
- * Copyright 2000-2014 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.tokka.server.communication.data;
-
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.Comparator;
- import java.util.List;
- import java.util.function.Function;
- import java.util.stream.Stream;
-
- /**
- * {@link DataSource} wrapper for {@link Collection}s.
- *
- * @param <T>
- * data type
- */
- public class InMemoryDataSource<T> implements DataSource<T, Comparator<T>> {
-
- // FIXME: Missing Query object
- private Function<Object, Stream<T>> request;
-
- /**
- * Constructs a new ListDataSource. This method makes a protective copy of
- * the contents of the Collection.
- *
- * @param collection
- * initial data
- */
- public InMemoryDataSource(Collection<T> collection) {
- final List<T> backend = new ArrayList<T>(collection);
- request = query -> backend.stream();
- }
-
- /**
- * Chaining constructor for making modified {@link InMemoryDataSource}s.
- * This Constructor is used internally for making sorted and filtered
- * variants of a base data source with actual data.
- *
- * @param request
- * request for the new data source
- */
- protected InMemoryDataSource(Function<Object, Stream<T>> request) {
- this.request = request;
- }
-
- @Override
- public Stream<T> apply(Object query) {
- return request.apply(query);
- }
-
- @Override
- public DataSource<T, Comparator<T>> sortingBy(Comparator<T> sortOrder) {
- return new InMemoryDataSource<T>(q -> request.apply(q)
- .sorted(sortOrder));
- }
- }
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