org.apache.flink.runtime.entrypoint.parser.CommandLineParser Maven / Gradle / Ivy
/*
* 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.runtime.entrypoint.parser;
import org.apache.flink.runtime.entrypoint.FlinkParseException;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import javax.annotation.Nonnull;
/**
* Command line parser which produces a result from the given
* command line arguments.
*/
public class CommandLineParser {
@Nonnull
private final ParserResultFactory parserResultFactory;
public CommandLineParser(@Nonnull ParserResultFactory parserResultFactory) {
this.parserResultFactory = parserResultFactory;
}
public T parse(@Nonnull String[] args) throws FlinkParseException {
final DefaultParser parser = new DefaultParser();
final Options options = parserResultFactory.getOptions();
final CommandLine commandLine;
try {
commandLine = parser.parse(options, args, true);
} catch (ParseException e) {
throw new FlinkParseException("Failed to parse the command line arguments.", e);
}
return parserResultFactory.createResult(commandLine);
}
public void printHelp(@Nonnull String cmdLineSyntax) {
final HelpFormatter helpFormatter = new HelpFormatter();
helpFormatter.setLeftPadding(5);
helpFormatter.setWidth(80);
helpFormatter.printHelp(cmdLineSyntax, parserResultFactory.getOptions(), true);
}
}