| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.wayang.core.api.configuration; |
| |
| import org.apache.wayang.core.api.Configuration; |
| |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.function.Function; |
| |
| /** |
| * {@link CollectionProvider} implementation based on a blacklist and a whitelist. |
| */ |
| public class FunctionalCollectionProvider<Value> extends CollectionProvider<Value> { |
| |
| private final Function<Configuration, Collection<Value>> providerFunction; |
| |
| public FunctionalCollectionProvider(Function<Configuration, Collection<Value>> providerFunction, Configuration configuration) { |
| super(configuration); |
| this.providerFunction = providerFunction; |
| } |
| |
| public FunctionalCollectionProvider(Function<Configuration, Collection<Value>> providerFunction, |
| Configuration configuration, |
| CollectionProvider parent) { |
| super(configuration, parent); |
| this.providerFunction = providerFunction; |
| } |
| |
| @Override |
| public Collection<Value> provideAll(Configuration configuration) { |
| Collection<Value> values = this.parent == null ? new HashSet<>() : new HashSet<>(this.parent.provideAll(configuration)); |
| values.addAll(this.providerFunction.apply(configuration)); |
| return values; |
| } |
| |
| } |