| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.jclouds.byon.suppliers; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkNotNull; |
| 22 | import static com.google.common.base.Preconditions.checkState; |
| 23 | |
| 24 | import java.io.InputStream; |
| 25 | |
| 26 | import javax.annotation.Resource; |
| 27 | import javax.inject.Inject; |
| 28 | import javax.inject.Singleton; |
| 29 | |
| 30 | import org.jclouds.byon.Node; |
| 31 | import org.jclouds.location.Provider; |
| 32 | import org.jclouds.logging.Logger; |
| 33 | |
| 34 | import com.google.common.base.Function; |
| 35 | import com.google.common.base.Supplier; |
| 36 | import com.google.common.cache.Cache; |
| 37 | |
| 38 | /** |
| 39 | * |
| 40 | * @author Adrian Cole |
| 41 | */ |
| 42 | @Singleton |
| 43 | public class NodesParsedFromSupplier implements Supplier<Cache<String, Node>> { |
| 44 | @Resource |
| 45 | protected Logger logger = Logger.NULL; |
| 46 | |
| 47 | private final Supplier<InputStream> supplier; |
| 48 | private final Function<InputStream, Cache<String, Node>> parser; |
| 49 | |
| 50 | @Inject |
| 51 | NodesParsedFromSupplier(@Provider Supplier<InputStream> supplier, Function<InputStream, Cache<String, Node>> parser) { |
| 52 | this.supplier = checkNotNull(supplier, "supplier"); |
| 53 | this.parser = checkNotNull(parser, "parser"); |
| 54 | } |
| 55 | |
| 56 | @Override |
| 57 | public Cache<String, Node> get() { |
| 58 | Cache<String, Node> nodes = parser.apply(supplier.get()); |
| 59 | checkState(nodes != null && nodes.size() > 0, "no nodes parsed from supplier: %s", supplier); |
| 60 | return nodes; |
| 61 | } |
| 62 | |
| 63 | } |