| /* |
| * 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 java.util.Collection; |
| import java.util.Iterator; |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| import org.apache.wayang.core.api.Configuration; |
| |
| /** |
| * Provides a {@link Collection} of objects. |
| */ |
| public abstract class CollectionProvider<Value> implements Iterable<Value> { |
| |
| private static final Logger logger = LogManager.getLogger(); |
| |
| protected CollectionProvider<Value> parent; |
| |
| protected final Configuration configuration; |
| |
| public CollectionProvider(Configuration configuration) { |
| this(configuration, null); |
| } |
| |
| public CollectionProvider(Configuration configuration, CollectionProvider parent) { |
| this.configuration = configuration; |
| this.parent = parent; |
| } |
| |
| |
| public void setParent(CollectionProvider<Value> parent) { |
| this.parent = parent; |
| } |
| |
| /** |
| * Provide all objects. |
| * |
| * @return the provided objects from this instance and its parents (unless those are masked). |
| */ |
| public Collection<Value> provideAll() { |
| return this.provideAll(this.configuration); |
| } |
| |
| /** |
| * Provide all objects. |
| * |
| * @return the provided objects from this instance and its parents (unless those are masked). |
| */ |
| protected abstract Collection<Value> provideAll(Configuration configuration); |
| |
| @Override |
| public Iterator<Value> iterator() { |
| return this.provideAll().iterator(); |
| } |
| } |