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/**
 * 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.commons.cli;

import java.util.List;
import java.util.Iterator;

/**
 * Thrown when a required option has not been provided.
 *
 * @version $Id: MissingOptionException.java 1443102 2013-02-06 18:12:16Z tn $
 */
public class MissingOptionException extends ParseException
{
    /** This exception {@code serialVersionUID}. */
    private static final long serialVersionUID = 8161889051578563249L;

    /** The list of missing options and groups */
    private List missingOptions;

    /**
     * Construct a new MissingSelectedException
     * with the specified detail message.
     *
     * @param message the detail message
     */
    public MissingOptionException(String message)
    {
        super(message);
    }

    /**
     * Constructs a new MissingSelectedException with the
     * specified list of missing options.
     *
     * @param missingOptions the list of missing options and groups
     * @since 1.2
     */
    public MissingOptionException(List missingOptions)
    {
        this(createMessage(missingOptions));
        this.missingOptions = missingOptions;
    }

    /**
     * Returns the list of options or option groups missing in the command line parsed.
     *
     * @return the missing options, consisting of String instances for simple
     *         options, and OptionGroup instances for required option groups.
     * @since 1.2
     */
    public List getMissingOptions()
    {
        return missingOptions;
    }

    /**
     * Build the exception message from the specified list of options.
     *
     * @param missingOptions the list of missing options and groups
     * @since 1.2
     */
    private static String createMessage(List missingOptions)
    {
        StringBuilder buf = new StringBuilder("Missing required option");
        buf.append(missingOptions.size() == 1 ? "" : "s");
        buf.append(": ");

        Iterator it = missingOptions.iterator();
        while (it.hasNext())
        {
            buf.append(it.next());
            if (it.hasNext())
            {
                buf.append(", ");
            }
        }

        return buf.toString();
    }
}