OptionParserHelper.java

package org.mutabilitydetector.cli;

/*
 * #%L
 * MutabilityDetector
 * %%
 * Copyright (C) 2008 - 2014 Graham Allan
 * %%
 * Licensed 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.
 * #L%
 */



import static java.util.Arrays.copyOf;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

/**
 * Interacts with the Apache CLI to parse the options from the command line arguments. Delegates to a
 * {@link ParsingAction} to allow extracting the options.
 */
public class OptionParserHelper {

    private Options options;
    private String[] args;

    public OptionParserHelper(Options options, String[] args) {
        this.options = options;
        this.args = copyOf(args, args.length);
    }

    public void parseOptions(ParsingAction action) {
        try {
            CommandLineParser parser = new GnuParser();
            CommandLine line = parser.parse(options, args);
            action.doParsingAction(line);
        } catch (ParseException e) {
            System.out.println("Parsing command line options failed.%nReason: " + e.getMessage());
            throw new CommandLineOptionsException(e);
        }

    }
}

interface ParsingAction {
    void doParsingAction(CommandLine line);
}