/**
 * 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 backtype.storm;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.commons.cli.ParseException;


/**
 * A utility class to help run {@link Tool}s
 *
 * <p>
 * <code>ToolRunner</code> can be used to run classes extending the <code>Tool</code> abstract class. It works in conjunction with {@link GenericOptionsParser} to parse the <a
 * href="{@docRoot} to parse the <a href="{@docRoot} to parse the <a href="{@docRoot} to parse the <a
 * href="{@docRoot}
 * to parse the <a href="{@docRoot} to parse the <a href="{@docRoot} to parse the <a href="{@docRoot} to parse the <a href="{@docRoot}
 * to parse the <a href="{@docRoot} to parse the <a href="{@docRoot} to parse the <a href="{@docRoot} to parse the <a href="{@docRoot} to parse the <a
 * href="{@docRoot} to parse the <a href="{@docRoot} to parse the <a href="{@docRoot} to parse the <a href="{@docRoot}
 * /backtype/storm/GenericOptionsParser.html#GenericOptions"> generic storm command line arguments</a> and modifies the <code>Config</code> of the
 * <code>Tool</code>. The application-specific options are passed along without being modified.
 *
 * @see Tool
 * @see GenericOptionsParser
 */

public class ToolRunner {
    static final Logger LOG = LoggerFactory.getLogger(ToolRunner.class);

    public static void run(Tool tool, String[] args) {
        run(tool.getConf(), tool, args);
    }

    public static void run(Config conf, Tool tool, String[] args) {
        try {
            if (conf == null) {
                conf = new Config();
            }

            GenericOptionsParser parser = new GenericOptionsParser(conf, args);
            LOG.info(conf.toString());
            tool.setConf(conf);

            System.exit(tool.run(parser.getRemainingArgs()));
        } catch (ParseException e) {
            LOG.error("Error parsing generic options: {}", e.getMessage());
            GenericOptionsParser.printGenericCommandUsage(System.err);
            System.exit(2);
        } catch (Exception e) {
            LOG.error("Error running tool", e);
            System.exit(1);
        }
    }
}