| /** |
| * 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.hadoop.mapreduce.security.token; |
| |
| import java.util.Collection; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.security.token.Token; |
| import org.apache.hadoop.security.token.TokenIdentifier; |
| import org.apache.hadoop.security.token.TokenSelector; |
| |
| /** |
| * Look through tokens to find the first job token that matches the service |
| * and return it. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public class JobTokenSelector implements TokenSelector<JobTokenIdentifier> { |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public Token<JobTokenIdentifier> selectToken(Text service, |
| Collection<Token<? extends TokenIdentifier>> tokens) { |
| if (service == null) { |
| return null; |
| } |
| for (Token<? extends TokenIdentifier> token : tokens) { |
| if (JobTokenIdentifier.KIND_NAME.equals(token.getKind()) |
| && service.equals(token.getService())) { |
| return (Token<JobTokenIdentifier>) token; |
| } |
| } |
| return null; |
| } |
| } |
