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Java library provided an annotation-based framework for parsing Git like command line structures
/**
* Copyright (C) 2010-16 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.github.rvesse.airline.restrictions.common;
import org.apache.commons.collections4.CollectionUtils;
import com.github.rvesse.airline.model.ArgumentsMetadata;
import com.github.rvesse.airline.model.OptionMetadata;
import com.github.rvesse.airline.parser.ParseState;
import com.github.rvesse.airline.parser.errors.ParseArgumentsMissingException;
import com.github.rvesse.airline.parser.errors.ParseOptionMissingException;
import com.github.rvesse.airline.restrictions.AbstractCommonRestriction;
import com.github.rvesse.airline.utils.AirlineUtils;
import com.github.rvesse.airline.utils.predicates.parser.ParsedOptionFinder;
/**
* A restriction that options/arguments are required
*/
public class IsRequiredRestriction extends AbstractCommonRestriction {
@Override
public void finalValidate(ParseState state, OptionMetadata option) {
if (CollectionUtils.find(state.getParsedOptions(), new ParsedOptionFinder(option)) == null)
throw new ParseOptionMissingException(AirlineUtils.first(option.getOptions()));
}
@Override
public void finalValidate(ParseState state, ArgumentsMetadata arguments) {
if (state.getParsedArguments().isEmpty())
throw new ParseArgumentsMissingException(arguments.getTitle());
}
}