HadoopUtils.java

/*
 * 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.flink.hadoopcompatibility;

import org.apache.commons.cli.Option;
import org.apache.flink.api.java.utils.ParameterTool;
import org.apache.hadoop.util.GenericOptionsParser;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * Utility class to work with Apache Hadoop libraries.
 */
public class HadoopUtils {
	/**
	 * Returns {@link ParameterTool} for the arguments parsed by {@link GenericOptionsParser}
	 *
	 * @param args Input array arguments. It should be parsable by {@link GenericOptionsParser}
	 * @return A {@link ParameterTool}
	 * @throws IOException If arguments cannot be parsed by {@link GenericOptionsParser}
	 * @see GenericOptionsParser
	 */
	public static ParameterTool paramsFromGenericOptionsParser(String[] args) throws IOException {
		Option[] options = new GenericOptionsParser(args).getCommandLine().getOptions();
		Map<String, String> map = new HashMap<String, String>();
		for (Option option : options) {
			String[] split = option.getValue().split("=");
			map.put(split[0], split[1]);
		}
		return ParameterTool.fromMap(map);
	}
}