com.planet57.gshell.util.cli2.CliParser.java Source code

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Here is the source code for com.planet57.gshell.util.cli2.CliParser.java

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/*
 * Copyright (c) 2009-present the original author or authors.
 *
 * 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.
 */
package com.planet57.gshell.util.cli2;

import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.MissingOptionException;

/**
 * Command-line parser.
 *
 * @since 3.0
 */
interface CliParser extends CommandLineParser {
    enum Flavor {
        POSIX, GNU, DEFAULT;

        public CliParser create() {
            switch (this) {
            case POSIX:
                return new PosixParser();

            case GNU:
                return new GnuParser();

            case DEFAULT:
                return new DefaultParser();
            }

            // unreachable
            throw new Error();
        }

        @SuppressWarnings("deprecation")
        private static class GnuParser extends org.apache.commons.cli.GnuParser implements CliParser {
            /**
             * Default required options check delayed for {@link Option#override()} support.
             */
            @Override
            protected void checkRequiredOptions() {
                // empty
            }

            @Override
            public void ensureRequiredOptionsPresent() throws MissingOptionException {
                super.checkRequiredOptions();
            }
        }

        @SuppressWarnings("deprecation")
        private static class PosixParser extends org.apache.commons.cli.PosixParser implements CliParser {
            /**
             * Default required options check delayed for {@link Option#override()} support.
             */
            @Override
            protected void checkRequiredOptions() {
                // empty
            }

            @Override
            public void ensureRequiredOptionsPresent() throws MissingOptionException {
                super.checkRequiredOptions();
            }
        }

        private static class DefaultParser extends org.apache.commons.cli.DefaultParser implements CliParser {
            /**
             * Default required options check delayed for {@link Option#override()} support.
             */
            @Override
            protected void checkRequiredOptions() {
                // empty
            }

            @Override
            public void ensureRequiredOptionsPresent() throws MissingOptionException {
                super.checkRequiredOptions();
            }
        }
    }

    /**
     * Throws {@link MissingOptionException} if any required options are missing.
     */
    void ensureRequiredOptionsPresent() throws MissingOptionException;
}