/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
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 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
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 */
package org.apache.commons.lang;

import java.util.Arrays;

/**
 * <p>Thrown to indicate an incomplete argument to a method.</p>
 * 
 * @author Matthew Hawthorne
 * @since 2.0
 * @version $Id$
 */
public class IncompleteArgumentException extends IllegalArgumentException {

    /**
     * <p>Instantiates with the specified description.</p>
     * 
     * @param argName  a description of the incomplete argument
     */
    public IncompleteArgumentException(String argName) {
        super(argName + " is incomplete.");
    }

    /**
     * <p>Instantiates with the specified description.</p>
     * 
     * @param argName  a description of the incomplete argument
     * @param items  an array describing the arguments missing
     */
    public IncompleteArgumentException(String argName, String[] items) {
        super(
            argName
                + " is missing the following items: "
                + safeArrayToString(items));
    }

    /**
     * <p>7Converts an array to a string without throwing an exception.</p>
     * 
     * @param array  an array
     * @return the array as a string
     */
    private static final String safeArrayToString(Object[] array) {
        return array == null ? null : Arrays.asList(array).toString();
    }

}