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001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 package org.apache.oozie.util;
019
020 import org.apache.hadoop.conf.Configuration;
021 import org.apache.oozie.service.ELService;
022 import org.apache.oozie.service.Services;
023
024 import java.util.HashMap;
025 import java.util.Map;
026
027 /**
028 * EL utilities
029 */
030 public class ELUtils {
031
032 /**
033 * Resolves the application name using the configuration properties to resolve any EL variable.
034 *
035 * @param name name to EL resolve.
036 * @param conf configuration to use for resolving any EL variable in the name.
037 *
038 * @return the resolved application name.
039 *
040 * @throws Exception thrown if the name could not be EL resolved.
041 */
042 public static String resolveAppName(String name, Configuration conf) throws Exception {
043 ELService elService = Services.get().get(ELService.class);
044 ELEvaluator elEvaluator = elService.createEvaluator("job-submit");
045 Map<String, Object> map = new HashMap<String, Object>();
046 for (Map.Entry<String, String> entry : conf) {
047 map.put(entry.getKey(), entry.getValue());
048 }
049 elEvaluator.getContext().setVariables(map);
050 return elEvaluator.evaluate(name, String.class);
051 }
052
053 }